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Michel Cuney

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Charalampos Vasilatos

National & Kapodistrian University of Athens

Universidad Nacional de Colombia (National University of Colombia)

Deutsches Bergbau-Museum, Bochum

Dimitrios Kostopoulos

National & Kapodistrian University of Athens

British Geological Survey

Gabriel Gutierrez-Alonso

University of Salamanca

Vasilios Melfos

Aristotle University of Thessaloniki

Mahmoud M Mekkawi

National Research Institute Of Astronomy And Geophysics Nriag

Presidency University, Bengaluru

Universitat de Barcelona

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Papers by Michel Cuney

Release of uranium from highly radiogenic zircon through metamictization: The source of orogenic uranium ores

Geology, 2015

We recently presented a model for syn-orogenic U mineralization enriched in Zr and rare earth ele... more We recently presented a model for syn-orogenic U mineralization enriched in Zr and rare earth elements (REEs), which invoked scavenging of these elements from the sheared margin of unusually U-and Thrich granite by highly saline fluids (McGloin et al., 2016). We appreciate the debate of this paper provided by Cuney (2016), and welcome this opportunity to further discuss our work. A key overarching point that we made in our paper is that to improve our understanding of ore deposit genesis in general, elements other than the metals of economic interest can be used to trace the source of metals; in this case, Zr was used to trace the source to granites in which the zirconium minerals were highly metamict. A similar approach could be used to improve our understanding of other deposit types; for example, Ag and As in orogenic gold systems, or platinum group elements in porphyry Cu-Au systems. Cuney's Comment does not challenge this point, but rather, focuses on the mineralogy of the U-bearing minerals in the granite. He rightly points out that U is contained in a series of minerals, not just zircon. We agree completely, and in the primary manuscript, provided a series of element and mineral maps showing that U, Zr, and REEs are contained in complex clusters of metamict minerals including zircon; several U-Th-Zr, Th-Zr, and Th-Zr-K silicate minerals; and REE fluorocarbonate, coexisting with fluorite and fluorapatite (our figures 3 and 4). Possibly the best source to understand the mineralogy in these clusters is provided by Förster (2006), who points out that there is a complex array of solid solutions in the system zircon (ZrSiO 4)-coffinite [U(SiO 4); can be hydrous]-thorite (ThSiO 4)-xenotime [(Y,HREE)PO 4 ], and that the understanding of the mineralogical variation in this system is far from complete. Cuney is not accurate in his analysis of the mineralogy in our figures, suggesting that the orange-colored Th-Zr silicate mineral in

The world-class Nanling metallogenic belt (Jiangxi, China): W and Sn deposition at 160 Ma followed by 30 m.y. of hydrothermal metal redistribution

Ore Geology Reviews, Feb 1, 2020

Abstract The W-Sn Maoping deposit and related W-Sn deposits from the world-class Nanling Range in... more Abstract The W-Sn Maoping deposit and related W-Sn deposits from the world-class Nanling Range in Southeast China formed at ca. 160 Ma and experienced several phases of metal addition and metal redistribution between 160 and 130 Ma. Isotopic dating of ore mineral (wolframite) of Maoping demonstrates that W was deposited first, during a hydrothermal event at ca. 160 Ma. Successive fluid episodes, at ca. 156 Ma (Mo and Sn-rich fluid) and 152 Ma (REE-rich fluid), resulted in the formation of REE- and Fe-Cu-Zn-sulfide minerals. A last fluid event occurring at ca. 130 Ma was responsible for the deposition of Zr-REE-Nb-Ta minerals that are attributed to magmatic fluids derived from unexposed magmatic bodies. The three episodes of fluid circulation post-dating W deposition resulted in partial to complete resetting of the isotopic systems (mica, wolframite, xenotime), which are conventionally used for dating such deposits. We show that W and Sn mineralization in the Nanling Range formed during a unique fluid event at ca. 160 Ma. Later fluid episodes redistributed the previously deposited metals and sequentially introduced additional metals, including Mo-Sn, Fe-Cu-Zn, and Zr-REE-Nb-Ta. Direct dating of paragenetically well-constrained minerals is therefore critical for determining the age and the duration of mineralizing processes and for characterizing the fluid evolution of magmatic-hydrothermal systems, as exemplified in the Nanling Range.

Uranium metallogenesis of the peraluminous leucogranite from the Pontivy-Rostrenen magmatic complex (French Armorican Variscan belt): the result of long-term oxidized hydrothermal alteration during strike-slip deformation

Mineralium Deposita, Sep 18, 2017

In the French Armorican Variscan belt, most of the economically significant hydrothermal U deposi... more In the French Armorican Variscan belt, most of the economically significant hydrothermal U deposits are spatially associated with peraluminous leucogranites emplaced along the south Armorican shear zone (SASZ), a dextral lithospheric scale wrench fault that recorded ductile deformation from ca. 315 to 300 Ma. In the Pontivy-Rostrenen complex, a composite intrusion, the U mineralization is spatially associated with brittle structures related to deformation along the SASZ. In contrast to monzogranite and quartz monzodiorite (3 < U < 9 ppm; Th/U > 3), the leucogranite samples are characterized by highly variable U contents (~3 to 27 ppm) and Th/U ratios (~0.1 to 5) suggesting that the crystallization of magmatic uranium oxide in the more evolved facies was followed by uranium oxide leaching during hydrothermal alteration and/or surface weathering. U-Pb dating of uranium oxides from the deposits reveals that they mostly formed between ca. 300 and 270 Ma. In monzogranite and quartz monzodiorite, apatite grains display magmatic textures and provide U-Pb ages of ca. 315 Ma reflecting the time of emplacement of the intrusions. In contrast, apatite grains from the leucogranite display textural, geochemical, and geochronological evidences for interaction with U-rich oxidized hydrothermal fluids contemporaneously with U mineralizing events. From 300 to 270 Ma, infiltration of surface-derived oxidized fluids leached magmatic uranium oxide from fertile leucogranite and formed U deposits. This phenomenon was sustained by brittle deformation and by the persistence of thermal anomalies associated with U-rich granitic bodies.

Tectonic, Geochemical and Microstructural Context of Uranium Migration in Granites of the Krasnokamensk Area, Russia

The main aim of the contribution is to associate data on fluid flow conditions and radionuclide t... more The main aim of the contribution is to associate data on fluid flow conditions and radionuclide transport processes, which occur at different spatial-temporal scales in Paleozoic fractured granitic rocks. Objects of examination are three sites at the Krasnokamensk area, Chita region, SE Siberia, Russia including surfaces of the SNF storage potential Sites No. 1 and No. 5 as well as underground openings of the Antey uranium deposit operated by PPGKhO. Data of collaborative four-year in situ observations and subsequent laboratory test are presented. Obtained results are discussed in the context of further modelization of the main features, events and processes existing at different scales arranged in 3D space to quantify the parameters of fluid flow pathways and to assess the dynamics of uranium transfer in variously deformed and alterated fractured porous granites.

Petrogenesis of Nb–(Ta) aplo-pegmatites and fine-grained granites from the Early Cretaceous Huangshan rare-metal granite suite, northeast Jiangxi Province, southeast China

Lithos, Nov 1, 2019

The Early Cretaceous (ca. 130 Ma) Nb-rich and Ta-poor Huangshan suite, South China, includes a se... more The Early Cretaceous (ca. 130 Ma) Nb-rich and Ta-poor Huangshan suite, South China, includes a series of medium-grained granites that contain Nb-rich mica and very low columbite contents, which are indicative of a potential Nb resource. In addition, the Huangshan suite contains fine-grained granites and aplo-pegmatites in which disseminated Nb-Ta columbite is an ore. Two types of fine-grained microclinebearing and albite-rich leucogranite sills and dikes were identified. Sills and dikes of leucogranites and aplo-pegmatites intrude the medium-grained granites and surrounding hornfels. The aplo-pegmatites consist of large microcline and quartz crystals that are typically broken and embedded within a foliated albite-rich matrix. Niobium-rich and Mn-poor columbite with Ta# [Ta/(Ta + Nb)] ≤ 0.5 and Mn# [Mn/(Mn + Fe)] < 0.2, which is characterized by complex zonation, is the major accessory mineral in the fine-grained granites and aplo-pegmatites. The Huangshan columbites display an unusual pattern of Ta# variation at nearly constant Mn#. Fractional crystallization along cannot explain the observed trends, but they can be accounted for by recurrent mixing between two distinct and independently evolving magmas. One end-member is deemed to be an evolved Nb-rich magma, and the other is a Ta-enriched magma of the peraluminous rare-metal granite series (i.e., Yichun trend). Major and trace element features also support this model of recurrent magma mixing.

Recent advances about the unconformity-related U deposits

The Panasqueira Rare Metal Granite Suites and Their Involvement in the Genesis of the World-Class Panasqueira W–Sn–Cu Vein Deposit: A Petrographic, Mineralogical, and Geochemical Study

Minerals, 2020

Elucidation of time-space relationships between a given wolframite deposit and the associated gra... more Elucidation of time-space relationships between a given wolframite deposit and the associated granites, the nature of the latter, and their alterations, is a prerequisite to establishing a genetic model. In the case of the world-class Panasqueira deposit, the problem is complicated because the associated granites are concealed and until now poorly known. The study of samples from a recent drill hole and a new gallery allowed a new approach of the Panasqueira granite system. Detailed petrographic, mineralogical, and geochemical studies were conducted, involving bulk major and trace analyses, BSE and CL imaging, EPMA, and SEM-EDS analyses of minerals. The apical part of the Pansqueira pluton consisted of a layered sequence of separate granite pulses, strongly affected by polyphase alteration. The use of pertinent geochemical diagrams (major and trace elements) facilitated the discrimination of magmatic and alteration trends. The studied samples were representative of a magmatic suite ...

Uranium Mineralogical and Chemical Features of the Na-Metasomatic Type Uranium Deposit in the Longshoushan Metallogenic Belt, Northwestern China

Minerals, 2020

The Longshoushan Metallogenic Belt (northwestern China) is known for its word-class Jinchuan Ni-C... more The Longshoushan Metallogenic Belt (northwestern China) is known for its word-class Jinchuan Ni-Cu sulfide (Pt) deposit and is also an important uranium metallogenic belt. The Jiling uranium deposit in this belt is a typical Na-metasomatic uranium deposit, which rarely occurs in China. Mineralization in the Jiling uranium deposit is hosted in granitoids that have suffered a Na-metasomatic alteration. There are three kinds of uranium minerals, including uraninite, pitchblende, and coffinite in the Jiling uranium deposit. Pitchblende is the predominant uranium mineral. Integrating the mineralogy and geochemistry of uranium minerals, and in situ electron microprobe analyzer (EMPA) U-Th-Pb chemical dating, we aimed to unravel the age and nature of the mineralization, to decipher the characteristics of the hydrothermal alteration and the U mineralization process. Based on the microtextural features and compositional variations, primary uraninite was altered to uraninite A and B, and fres...

Evolution of the uranium mineralisation in the Zoujiashan deposit, Xiangshan ore field: Implications for the genesis of volcanic-related hydrothermal U deposits in South China

Ore Geology Reviews, 2020

Evolution of the uranium mineralisation in the Zoujiashan deposit, Xiangshan ore field: Implicati... more

Multiple fluids involved in granite-related W-Sn deposits from the world-class Jiangxi province (China)

Chemical Geology, 2018

This paper aims at providing new insights into W-Sn ore-forming processes within one of the large... more This paper aims at providing new insights into W-Sn ore-forming processes within one of the largest granitic provinces in the world (Nanling Range, South China), which was emplaced during the Jurassic-Cretaceous period. The origin, composition and pressure-temperature conditions of fluids involved in the W-Sn ore-forming processes have been investigated by microthermometry, Raman spectroscopy, LA-ICPMS, hydrogen isotope analyses of fluid inclusions and oxygen isotope analyses of minerals from the Maoping and Piaotang W-Sn deposits. For each deposit, pre-(quartz), syn-(wolframite and cassiterite) and post-ore (quartz, topaz and fluorite) minerals were studied. In both deposits, the vast majority of fluid inclusions are aqueous with salinities between 0.0 and 12.6 wt. % equiv. NaCl and homogenization temperatures between 136 and 349 °C. A minor proportion (~5%) of inclusions observed in the ore-stage quartz from Maoping have aquo-carbonic compositions. For both deposits, four compositional groups are defined. Early quartz fluid inclusions are characterized by salinities between 0.4 and 9.0 wt. % equiv. NaCl, trapping temperatures between 150 and 350 °C, and pressures between 20 and 150 MPa. LA-ICPMS analyses of these fluid inclusions reveal a wide range of Na, K and Li concentrations, as well as relatively low metal contents (W < 40 ppm). Values of δ 18 O in quartz range from-3.6 to 5.3 ‰ VSMOW while δD values of the fluid inclusions range from-59 to-51 ‰ VSMOW. The salinity of fluid inclusions in wolframite, cassiterite, topaz and fluorite is between 2.4 and 11.2 wt. % equiv. NaCl, trapping temperatures are between 200 and 600 °C, and pressures range from 20 to 250 MPa. LA-ICPMS analyses of these fluid inclusions reveal higher concentrations of Na, K and Li as well as Cs and metals (e.g. between 10 and 220 ppm W). Values of δ 18 O in wolframite, cassiterite, topaz and fluorite crystals range from-3.0 to 3.3 3 ‰ VSMOW while δD values of fluid inclusions in these mineral phases range from-78 to-72 ‰ VSMOW. At Piaotang, fluid inclusions in wolframite as well as in post-ore quartz and fluorite have salinities of 5.6 to 12.6 wt.% eq. NaCl, trapping temperatures between 150 and 400 °C and pressures of 20 to 150 MPa. LA-ICPMS analyses of these fluid inclusions reveal similar compositions to early quartz fluid inclusions. Values of δ O in wolframite and quartz crystals range from-0.8 to 5.2 ‰ VSMOW, while the δD values of fluid inclusions range from-66 to-62 ‰ VSMOW. Collectively, the data suggest the involvement of four aqueous fluid end-members, mixed episodically in the mineralization process: (A) a low-salinity, low-temperature, metal-poor, low-δ 18 O, low-δD fluid derived from meteoric water; (B) a high-salinity, high-temperature, metal-poor, high-δ 18 O, low-δD fluid derived from a differentiated peraluminous granitic magma; (C) a high-salinity, high-temperature, metal-rich, lower δD magmatic fluid derived from a more differentiated peraluminous granitic magma; and (D) a high-salinity, hightemperature, metal-rich, high-δ 18 O, low-δD magmatic fluid. This study shows that multiple fluids with distinct magmatic and meteoric origins were involved in the formation of these W-Sn deposits and that the dilution of metal-bearing magmatic fluids by meteoric fluids was probably the main driver for ore deposition. The common fluid history of the two deposits studied, as well as similarities with other deposits in the Jiangxi province, points towards common ore-forming processes at the regional scale.

40 Ma of hydrothermal W mineralization during the Variscan orogenic evolution of the French Massif Central revealed by U-Pb dating of wolframite

Mineralium Deposita, 2017

We present U-Pb thermal ionization mass spectrometer (TIMS) ages of wolframite from several grani... more We present U-Pb thermal ionization mass spectrometer (TIMS) ages of wolframite from several granite-related hydrothermal W±Sn deposits in the French Massif Central (FMC) located in the internal zone of the Variscan belt. The studied wolframite samples are characterized by variable U and Pb contents (typically <10 ppm) and show significant variations in their radiogenic Pb isotopic compositions. The obtained U-Pb ages define three distinct geochronological groups related to three contrasting geodynamic settings: (i) Visean to Namurian mineralization (333–327 Ma) coeval with syn-orogenic compression and emplacement of large peraluminous leucogranites (ca. 335–325 Ma), (ii) Namurian to Westphalian mineralization (317–315 Ma) synchronous with the onset of late-orogenic extension and emplacement of syn-tectonic granites (ca. 315–310 Ma) and (iii) Stephanian to Permian mineralization (298–274 Ma) formed during post-orogenic extension contemporaneous with the Permian volcanism in the entire Variscan belt. The youngest ages (276–274 Ma) likely reflect the reopening of the U-Pb isotopic system after wolframite crystallization and may correspond to late hydrothermal alteration (e.g. ferberitization). Our results demonstrate that W(±Sn) mineralization in the FMC formed during at least three distinct hydrothermal events in different tectono-metamorphic settings over a time range of 40 Ma.

Detailed paragenesis and Li-mica compositions as recorders of the magmatic-hydrothermal evolution of the Maoping W-Sn deposit (Jiangxi, China)

Lithos, 2016

Li-micas have been used as indicators of the evolution of granites. However, hydrothermal Li-mica... more Li-micas have been used as indicators of the evolution of granites. However, hydrothermal Li-micas are less documented. World-class W-Sn deposits associated with Early Yanshanian granites (South Jiangxi, China) show magmatic and hydrothermal Li-micas which could help unravelling the magmatic-hydrothermal evolution of rare metal deposits. Six types of Li-micas have been identified in the vein system of the Maoping W-Sn deposit through detailed petrography and EPMA and LA-ICP-MS analyses, by chronological order: (i) late-magmatic Limicas in feldspar veins, associated with late crystallization of a peraluminous melt; (ii) hydrothermal Fe-Li micas (Fe-Li mica veins and selvages); (iii) hydrothermal Fe-Li micas in W-Sn veins; (iv) Fe-Li micas in later banded quartz veins; (v) Li-muscovite in the final stages; and finally (vi) micas associated with alteration at each stage. Based on oscillatory variations and trends in major elements composition, the chemical variations in Li-micas from the successive stages and in hydrothermal micas that crystallized in the veins are interpreted to reflect mixing between at least three fluids of possible magmatic, meteoric and metamorphic origins. The crystallization of zircons and REE minerals, combined with variations of major and trace element concentrations in the Li-micas, notably an enrichment of rare metals (W-Sn-Ta-Nb) in the Li-micas, implies emplacement of a hidden peralkaline REE-rich magma during the crystallization of the banded quartz veins, a source which was different to the pre-existing peraluminous granites. The possible involvement of both peraluminous and peralkaline intrusives suggests the existence of polyphase magmatic-hydrothermal systems in the Maoping deposit, during the Yanshanian event (190-80 Ma).

Magmatic and hydrothermal behavior of uranium in syntectonic leucogranites: The uranium mineralization associated with the Hercynian Guérande granite (Armorican Massif, France)

Ore Geology Reviews, 2017

Most of the hydrothermal uranium (U) deposits from the European Hercynian belt (EHB) are spatiall... more Most of the hydrothermal uranium (U) deposits from the European Hercynian belt (EHB) are spatially associated with Carboniferous peraluminous leucogranites. In the southern part of the Armorican Massif (French part of the EHB), the Guérande peraluminous leucogranite was emplaced in an extensional deformation zone at ca. 310 Ma and is spatially associated with several U deposits and occurrences. The apical zone of the intrusion is structurally located below the Pen Ar Ran U deposit, a perigranitic vein-type deposit where mineralization occurs at the contact between black shales and Ordovician acid metavolcanics. In the Métairie-Neuve intragranitic deposit, uranium oxide-quartz veins crosscut the granite and a metasedimentary enclave.

Nb-Ti-Y-HREE-W-U Oxide Minerals With Uncommon Compositions Associated With the Tungsten Mineralization In the Puy-Les-Vignes Deposit (Massif Central, France): Evidence For Rare-Metal Mobilization By Late Hydrothermal Fluids With A Peralkaline Signature

The Canadian Mineralogist, 2015

The Puy-les-Vignes deposit, located in the northwestern part of the French Massif Central, is a r... more The Puy-les-Vignes deposit, located in the northwestern part of the French Massif Central, is a remarkable occurrence in the West European Variscan belt of hydrothermal tungsten mineralization associated with a breccia pipe structure. The late stage of the mineralization consists of a mineral paragenesis composed of zircon, xenotime, monazite, Nb-FeW rutile, and Nb-Ti-Y-HREE-W-U oxide minerals (hereafter referred to as NTox) within an adularia-tourmaline-chlorite matrix. This study is focused on these rare-metal oxides, which display complex internal textures and uncommon chemical compositions with variable concentrations of Nb, Ti, Y, HREE, and W, not described until now. They are characterized by low microprobe totals (76 to 95%), together with the presence of OHgroups within the crystallographic structure as detected by FTIR spectroscopy, which is interpreted as the result of alteration, such as hydration and/or metamictization. The crystallochemical study shows that these crystals appear as a complex multi-polar solid solution, involving chemical mixing between two groups of binary solid solutions: a first group of anatase-columbite solid solution and a second group of euxenite-(Y)-columbite solid solution. Interpretation of their internal texture and their chemistry suggest that the NTox were formed during multi-phase crystallization in an open system by the mixing of two different hydrothermal fluids: a first fluid (L 1) enriched in Ti4Nb, Fe, and W, with the same geochemical signature as the main mineralization, and a second fluid (L 2) enriched in Nb4Ti, Fe, Y, REE, and W, with a geochemical signature clearly contrasting with the former and coeval with the crystallization of adularia, xenotime, monazite, zircon, and rutile. This mineral paragenesis is characterized by a P, Y, HREE, Nb 4 Ta, Ti, Zr, and U geochemical signature, typical of raremetal peralkaline magmatism, thus suggesting rare-metal mobilization by late hydrothermal fluids with a peralkaline signature, likely derived from an unknown source at depth (e.g., NYF pegmatites or related granite), during the late metallogenic stages at Puy-les-Vignes.

Hydrothermal Activity Related to Perigranitic W-Sn Mineralization in the Maoping deposit (Jiangxi, China)

The Jiangxi province (South China) is currently the world's leading tungsten (W) producer. Wo... more The Jiangxi province (South China) is currently the world's leading tungsten (W) producer. Wolframite ((Fe,Mn)WO4) and cassiterite (SnO2) are hosted in quartz veins associated to polyphased granite intrusions. The respective implications of magmatic vs non-magmatic fluids in the ore-forming process is still controversial. This study focuses on (i) establishing a detailed paragenetic sequence for the Maoping deposit and (ii) acquiring fluid inclusion microthermometric and Raman data in transparent gangue minerals. Six successive veins filling stages have been identified. Stage I and II correspond to feldspath-only and quartz-zinnwaldite veins respectively. Stage III corresponds to mostly quartz-topaz-wolframite-cassiterite-zinnwaldite veins. Stage IV corresponds to metric banded quartz veins with zinnwaldite, feldspar and rare earth minerals underlining the banding. Stage V is mostly characterized by kaolinite, fluorite and various sulfides. Fluid inclusions in Stage III to V qua...

Min. Dep. - Look Inside - Fluids preserved in variably altered graphitic pelitic schists in the DuffereinLake Zone

The uranium mineralization of Pen Ar Ran (Armorican Massif), France: An atypical "vein type" deposit

Mineralogical Magazine, 2013

Twenty percent of the uranium produced in France was extracted in the Armorican Massif, in three ... more Twenty percent of the uranium produced in France was extracted in the Armorican Massif, in three different locations (Pontivy, Guerande et Mortagne) which belong to the "High Heat Production Belt", a 100 km wide NW-SE zone characterized by elevated contents in radioactive elements present in most of the geological formations [1], including 320 to 315 Ma old peraluminous granites [2]. In the Guerande uranium district, the Pen Ar Ran deposit is located in a deformed zone, at the contact between porphyroids and quartzitic black schists. This deformed zone corresponds to an E-W shear zone that affected both the metamorphic formations (porphyroids and black schists) and the intrusive Guerande leucogranite, during its emplacement. Mineralization is under the form of massive veins carrying pechblende and sulphide that are spatially associated with the leucogranite. However, this uranium deposit is different from the other "vein type" known in France because of the unusu...

Encyclopedia of Earth Sciences Series, 2016

Granite-related uranium deposits in Argentina: Geological context and new metallogenetic studies

Vienna International Centre. International Atomic Energy Agency, Nov 1, 2020

In Argentina, Devonian-Carboniferous magmatism has played a very relevant role in uranium metallo... more In Argentina, Devonian-Carboniferous magmatism has played a very relevant role in uranium metallogenesis, driving magmatic and late-magmatic preconcentration processes, both within and in the periphery of the granitic massifs. This research has characterized different types and subtypes of uranium deposits linked to that fertile magmatism. These new studies on uranium minerals from uranium sites of interest have improved the metallogenetic knowledge of the granite-related uranium deposits, which in turn could aid the exploration for similar uranium deposits. It was determined that granites play an important role both as a uranium source and hosts of diverse types of uranium mineralization. Additionally, it is thought that, at the existing level of knowledge, there are prospects for the discovery and development of new uranium resources related to granites in Argentina.Fil: Álvarez, J.. Comisión Nacional de Energía Atómica; ArgentinaFil: Parra, F.. Comisión Nacional de Energía Atómica; ArgentinaFil: Anzil, Patricia Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica; ArgentinaFil: Bello, C.. Comisión Nacional de Energía Atómica; ArgentinaFil: Ceballos, E.. Comisión Nacional de Energía Atómica; ArgentinaFil: Salvatore, M.. Comisión Nacional de Energía Atómica; ArgentinaFil: Scarlatta, L.. Comisión Nacional de Energía Atómica; ArgentinaFil: Miyno, S.. Comisión Nacional de Energía Atómica; ArgentinaFil: Felkai, E.. Comisión Nacional de Energía Atómica; ArgentinaFil: Ferreyra, P.. Comisión Nacional de Energía Atómica; ArgentinaFil: Zelaya, A.. Comisión Nacional de Energía Atómica; ArgentinaFil: Cuney, M.. Université de Lorraine; FranciaFil: Mercadier, J.. Université de Lorraine; FranciaFil: Hanly, A.. International Atomic Energy Agency (iaea);Fil: Lira, Raul. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Museo de Mineralogía y Geología "Dr. A. Stelzner"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentin

Petrogenesis of the late Paleoproterozoic Gleibat Lafhouda dolomite carbonatite (West African Craton Margin, Moroccan Sahara) and its relevance to the onset of fragmentation of the Columbia supercontinent

Chemical Geology, 2022

Release of uranium from highly radiogenic zircon through metamictization: The source of orogenic uranium ores

Geology, 2015

We recently presented a model for syn-orogenic U mineralization enriched in Zr and rare earth ele... more We recently presented a model for syn-orogenic U mineralization enriched in Zr and rare earth elements (REEs), which invoked scavenging of these elements from the sheared margin of unusually U-and Thrich granite by highly saline fluids (McGloin et al., 2016). We appreciate the debate of this paper provided by Cuney (2016), and welcome this opportunity to further discuss our work. A key overarching point that we made in our paper is that to improve our understanding of ore deposit genesis in general, elements other than the metals of economic interest can be used to trace the source of metals; in this case, Zr was used to trace the source to granites in which the zirconium minerals were highly metamict. A similar approach could be used to improve our understanding of other deposit types; for example, Ag and As in orogenic gold systems, or platinum group elements in porphyry Cu-Au systems. Cuney's Comment does not challenge this point, but rather, focuses on the mineralogy of the U-bearing minerals in the granite. He rightly points out that U is contained in a series of minerals, not just zircon. We agree completely, and in the primary manuscript, provided a series of element and mineral maps showing that U, Zr, and REEs are contained in complex clusters of metamict minerals including zircon; several U-Th-Zr, Th-Zr, and Th-Zr-K silicate minerals; and REE fluorocarbonate, coexisting with fluorite and fluorapatite (our figures 3 and 4). Possibly the best source to understand the mineralogy in these clusters is provided by Förster (2006), who points out that there is a complex array of solid solutions in the system zircon (ZrSiO 4)-coffinite [U(SiO 4); can be hydrous]-thorite (ThSiO 4)-xenotime [(Y,HREE)PO 4 ], and that the understanding of the mineralogical variation in this system is far from complete. Cuney is not accurate in his analysis of the mineralogy in our figures, suggesting that the orange-colored Th-Zr silicate mineral in

The world-class Nanling metallogenic belt (Jiangxi, China): W and Sn deposition at 160 Ma followed by 30 m.y. of hydrothermal metal redistribution

Ore Geology Reviews, Feb 1, 2020

Abstract The W-Sn Maoping deposit and related W-Sn deposits from the world-class Nanling Range in... more Abstract The W-Sn Maoping deposit and related W-Sn deposits from the world-class Nanling Range in Southeast China formed at ca. 160 Ma and experienced several phases of metal addition and metal redistribution between 160 and 130 Ma. Isotopic dating of ore mineral (wolframite) of Maoping demonstrates that W was deposited first, during a hydrothermal event at ca. 160 Ma. Successive fluid episodes, at ca. 156 Ma (Mo and Sn-rich fluid) and 152 Ma (REE-rich fluid), resulted in the formation of REE- and Fe-Cu-Zn-sulfide minerals. A last fluid event occurring at ca. 130 Ma was responsible for the deposition of Zr-REE-Nb-Ta minerals that are attributed to magmatic fluids derived from unexposed magmatic bodies. The three episodes of fluid circulation post-dating W deposition resulted in partial to complete resetting of the isotopic systems (mica, wolframite, xenotime), which are conventionally used for dating such deposits. We show that W and Sn mineralization in the Nanling Range formed during a unique fluid event at ca. 160 Ma. Later fluid episodes redistributed the previously deposited metals and sequentially introduced additional metals, including Mo-Sn, Fe-Cu-Zn, and Zr-REE-Nb-Ta. Direct dating of paragenetically well-constrained minerals is therefore critical for determining the age and the duration of mineralizing processes and for characterizing the fluid evolution of magmatic-hydrothermal systems, as exemplified in the Nanling Range.

Uranium metallogenesis of the peraluminous leucogranite from the Pontivy-Rostrenen magmatic complex (French Armorican Variscan belt): the result of long-term oxidized hydrothermal alteration during strike-slip deformation

Mineralium Deposita, Sep 18, 2017

In the French Armorican Variscan belt, most of the economically significant hydrothermal U deposi... more In the French Armorican Variscan belt, most of the economically significant hydrothermal U deposits are spatially associated with peraluminous leucogranites emplaced along the south Armorican shear zone (SASZ), a dextral lithospheric scale wrench fault that recorded ductile deformation from ca. 315 to 300 Ma. In the Pontivy-Rostrenen complex, a composite intrusion, the U mineralization is spatially associated with brittle structures related to deformation along the SASZ. In contrast to monzogranite and quartz monzodiorite (3 < U < 9 ppm; Th/U > 3), the leucogranite samples are characterized by highly variable U contents (~3 to 27 ppm) and Th/U ratios (~0.1 to 5) suggesting that the crystallization of magmatic uranium oxide in the more evolved facies was followed by uranium oxide leaching during hydrothermal alteration and/or surface weathering. U-Pb dating of uranium oxides from the deposits reveals that they mostly formed between ca. 300 and 270 Ma. In monzogranite and quartz monzodiorite, apatite grains display magmatic textures and provide U-Pb ages of ca. 315 Ma reflecting the time of emplacement of the intrusions. In contrast, apatite grains from the leucogranite display textural, geochemical, and geochronological evidences for interaction with U-rich oxidized hydrothermal fluids contemporaneously with U mineralizing events. From 300 to 270 Ma, infiltration of surface-derived oxidized fluids leached magmatic uranium oxide from fertile leucogranite and formed U deposits. This phenomenon was sustained by brittle deformation and by the persistence of thermal anomalies associated with U-rich granitic bodies.

Tectonic, Geochemical and Microstructural Context of Uranium Migration in Granites of the Krasnokamensk Area, Russia

The main aim of the contribution is to associate data on fluid flow conditions and radionuclide t... more The main aim of the contribution is to associate data on fluid flow conditions and radionuclide transport processes, which occur at different spatial-temporal scales in Paleozoic fractured granitic rocks. Objects of examination are three sites at the Krasnokamensk area, Chita region, SE Siberia, Russia including surfaces of the SNF storage potential Sites No. 1 and No. 5 as well as underground openings of the Antey uranium deposit operated by PPGKhO. Data of collaborative four-year in situ observations and subsequent laboratory test are presented. Obtained results are discussed in the context of further modelization of the main features, events and processes existing at different scales arranged in 3D space to quantify the parameters of fluid flow pathways and to assess the dynamics of uranium transfer in variously deformed and alterated fractured porous granites.

Petrogenesis of Nb–(Ta) aplo-pegmatites and fine-grained granites from the Early Cretaceous Huangshan rare-metal granite suite, northeast Jiangxi Province, southeast China

Lithos, Nov 1, 2019

The Early Cretaceous (ca. 130 Ma) Nb-rich and Ta-poor Huangshan suite, South China, includes a se... more The Early Cretaceous (ca. 130 Ma) Nb-rich and Ta-poor Huangshan suite, South China, includes a series of medium-grained granites that contain Nb-rich mica and very low columbite contents, which are indicative of a potential Nb resource. In addition, the Huangshan suite contains fine-grained granites and aplo-pegmatites in which disseminated Nb-Ta columbite is an ore. Two types of fine-grained microclinebearing and albite-rich leucogranite sills and dikes were identified. Sills and dikes of leucogranites and aplo-pegmatites intrude the medium-grained granites and surrounding hornfels. The aplo-pegmatites consist of large microcline and quartz crystals that are typically broken and embedded within a foliated albite-rich matrix. Niobium-rich and Mn-poor columbite with Ta# [Ta/(Ta + Nb)] ≤ 0.5 and Mn# [Mn/(Mn + Fe)] < 0.2, which is characterized by complex zonation, is the major accessory mineral in the fine-grained granites and aplo-pegmatites. The Huangshan columbites display an unusual pattern of Ta# variation at nearly constant Mn#. Fractional crystallization along cannot explain the observed trends, but they can be accounted for by recurrent mixing between two distinct and independently evolving magmas. One end-member is deemed to be an evolved Nb-rich magma, and the other is a Ta-enriched magma of the peraluminous rare-metal granite series (i.e., Yichun trend). Major and trace element features also support this model of recurrent magma mixing.

Recent advances about the unconformity-related U deposits

The Panasqueira Rare Metal Granite Suites and Their Involvement in the Genesis of the World-Class Panasqueira W–Sn–Cu Vein Deposit: A Petrographic, Mineralogical, and Geochemical Study

Minerals, 2020

Elucidation of time-space relationships between a given wolframite deposit and the associated gra... more Elucidation of time-space relationships between a given wolframite deposit and the associated granites, the nature of the latter, and their alterations, is a prerequisite to establishing a genetic model. In the case of the world-class Panasqueira deposit, the problem is complicated because the associated granites are concealed and until now poorly known. The study of samples from a recent drill hole and a new gallery allowed a new approach of the Panasqueira granite system. Detailed petrographic, mineralogical, and geochemical studies were conducted, involving bulk major and trace analyses, BSE and CL imaging, EPMA, and SEM-EDS analyses of minerals. The apical part of the Pansqueira pluton consisted of a layered sequence of separate granite pulses, strongly affected by polyphase alteration. The use of pertinent geochemical diagrams (major and trace elements) facilitated the discrimination of magmatic and alteration trends. The studied samples were representative of a magmatic suite ...

Uranium Mineralogical and Chemical Features of the Na-Metasomatic Type Uranium Deposit in the Longshoushan Metallogenic Belt, Northwestern China

Minerals, 2020

The Longshoushan Metallogenic Belt (northwestern China) is known for its word-class Jinchuan Ni-C... more The Longshoushan Metallogenic Belt (northwestern China) is known for its word-class Jinchuan Ni-Cu sulfide (Pt) deposit and is also an important uranium metallogenic belt. The Jiling uranium deposit in this belt is a typical Na-metasomatic uranium deposit, which rarely occurs in China. Mineralization in the Jiling uranium deposit is hosted in granitoids that have suffered a Na-metasomatic alteration. There are three kinds of uranium minerals, including uraninite, pitchblende, and coffinite in the Jiling uranium deposit. Pitchblende is the predominant uranium mineral. Integrating the mineralogy and geochemistry of uranium minerals, and in situ electron microprobe analyzer (EMPA) U-Th-Pb chemical dating, we aimed to unravel the age and nature of the mineralization, to decipher the characteristics of the hydrothermal alteration and the U mineralization process. Based on the microtextural features and compositional variations, primary uraninite was altered to uraninite A and B, and fres...

Evolution of the uranium mineralisation in the Zoujiashan deposit, Xiangshan ore field: Implications for the genesis of volcanic-related hydrothermal U deposits in South China

Ore Geology Reviews, 2020

Evolution of the uranium mineralisation in the Zoujiashan deposit, Xiangshan ore field: Implicati... more

Multiple fluids involved in granite-related W-Sn deposits from the world-class Jiangxi province (China)

Chemical Geology, 2018

This paper aims at providing new insights into W-Sn ore-forming processes within one of the large... more This paper aims at providing new insights into W-Sn ore-forming processes within one of the largest granitic provinces in the world (Nanling Range, South China), which was emplaced during the Jurassic-Cretaceous period. The origin, composition and pressure-temperature conditions of fluids involved in the W-Sn ore-forming processes have been investigated by microthermometry, Raman spectroscopy, LA-ICPMS, hydrogen isotope analyses of fluid inclusions and oxygen isotope analyses of minerals from the Maoping and Piaotang W-Sn deposits. For each deposit, pre-(quartz), syn-(wolframite and cassiterite) and post-ore (quartz, topaz and fluorite) minerals were studied. In both deposits, the vast majority of fluid inclusions are aqueous with salinities between 0.0 and 12.6 wt. % equiv. NaCl and homogenization temperatures between 136 and 349 °C. A minor proportion (~5%) of inclusions observed in the ore-stage quartz from Maoping have aquo-carbonic compositions. For both deposits, four compositional groups are defined. Early quartz fluid inclusions are characterized by salinities between 0.4 and 9.0 wt. % equiv. NaCl, trapping temperatures between 150 and 350 °C, and pressures between 20 and 150 MPa. LA-ICPMS analyses of these fluid inclusions reveal a wide range of Na, K and Li concentrations, as well as relatively low metal contents (W < 40 ppm). Values of δ 18 O in quartz range from-3.6 to 5.3 ‰ VSMOW while δD values of the fluid inclusions range from-59 to-51 ‰ VSMOW. The salinity of fluid inclusions in wolframite, cassiterite, topaz and fluorite is between 2.4 and 11.2 wt. % equiv. NaCl, trapping temperatures are between 200 and 600 °C, and pressures range from 20 to 250 MPa. LA-ICPMS analyses of these fluid inclusions reveal higher concentrations of Na, K and Li as well as Cs and metals (e.g. between 10 and 220 ppm W). Values of δ 18 O in wolframite, cassiterite, topaz and fluorite crystals range from-3.0 to 3.3 3 ‰ VSMOW while δD values of fluid inclusions in these mineral phases range from-78 to-72 ‰ VSMOW. At Piaotang, fluid inclusions in wolframite as well as in post-ore quartz and fluorite have salinities of 5.6 to 12.6 wt.% eq. NaCl, trapping temperatures between 150 and 400 °C and pressures of 20 to 150 MPa. LA-ICPMS analyses of these fluid inclusions reveal similar compositions to early quartz fluid inclusions. Values of δ O in wolframite and quartz crystals range from-0.8 to 5.2 ‰ VSMOW, while the δD values of fluid inclusions range from-66 to-62 ‰ VSMOW. Collectively, the data suggest the involvement of four aqueous fluid end-members, mixed episodically in the mineralization process: (A) a low-salinity, low-temperature, metal-poor, low-δ 18 O, low-δD fluid derived from meteoric water; (B) a high-salinity, high-temperature, metal-poor, high-δ 18 O, low-δD fluid derived from a differentiated peraluminous granitic magma; (C) a high-salinity, high-temperature, metal-rich, lower δD magmatic fluid derived from a more differentiated peraluminous granitic magma; and (D) a high-salinity, hightemperature, metal-rich, high-δ 18 O, low-δD magmatic fluid. This study shows that multiple fluids with distinct magmatic and meteoric origins were involved in the formation of these W-Sn deposits and that the dilution of metal-bearing magmatic fluids by meteoric fluids was probably the main driver for ore deposition. The common fluid history of the two deposits studied, as well as similarities with other deposits in the Jiangxi province, points towards common ore-forming processes at the regional scale.

40 Ma of hydrothermal W mineralization during the Variscan orogenic evolution of the French Massif Central revealed by U-Pb dating of wolframite

Mineralium Deposita, 2017

We present U-Pb thermal ionization mass spectrometer (TIMS) ages of wolframite from several grani... more We present U-Pb thermal ionization mass spectrometer (TIMS) ages of wolframite from several granite-related hydrothermal W±Sn deposits in the French Massif Central (FMC) located in the internal zone of the Variscan belt. The studied wolframite samples are characterized by variable U and Pb contents (typically <10 ppm) and show significant variations in their radiogenic Pb isotopic compositions. The obtained U-Pb ages define three distinct geochronological groups related to three contrasting geodynamic settings: (i) Visean to Namurian mineralization (333–327 Ma) coeval with syn-orogenic compression and emplacement of large peraluminous leucogranites (ca. 335–325 Ma), (ii) Namurian to Westphalian mineralization (317–315 Ma) synchronous with the onset of late-orogenic extension and emplacement of syn-tectonic granites (ca. 315–310 Ma) and (iii) Stephanian to Permian mineralization (298–274 Ma) formed during post-orogenic extension contemporaneous with the Permian volcanism in the entire Variscan belt. The youngest ages (276–274 Ma) likely reflect the reopening of the U-Pb isotopic system after wolframite crystallization and may correspond to late hydrothermal alteration (e.g. ferberitization). Our results demonstrate that W(±Sn) mineralization in the FMC formed during at least three distinct hydrothermal events in different tectono-metamorphic settings over a time range of 40 Ma.

Detailed paragenesis and Li-mica compositions as recorders of the magmatic-hydrothermal evolution of the Maoping W-Sn deposit (Jiangxi, China)

Lithos, 2016

Li-micas have been used as indicators of the evolution of granites. However, hydrothermal Li-mica... more Li-micas have been used as indicators of the evolution of granites. However, hydrothermal Li-micas are less documented. World-class W-Sn deposits associated with Early Yanshanian granites (South Jiangxi, China) show magmatic and hydrothermal Li-micas which could help unravelling the magmatic-hydrothermal evolution of rare metal deposits. Six types of Li-micas have been identified in the vein system of the Maoping W-Sn deposit through detailed petrography and EPMA and LA-ICP-MS analyses, by chronological order: (i) late-magmatic Limicas in feldspar veins, associated with late crystallization of a peraluminous melt; (ii) hydrothermal Fe-Li micas (Fe-Li mica veins and selvages); (iii) hydrothermal Fe-Li micas in W-Sn veins; (iv) Fe-Li micas in later banded quartz veins; (v) Li-muscovite in the final stages; and finally (vi) micas associated with alteration at each stage. Based on oscillatory variations and trends in major elements composition, the chemical variations in Li-micas from the successive stages and in hydrothermal micas that crystallized in the veins are interpreted to reflect mixing between at least three fluids of possible magmatic, meteoric and metamorphic origins. The crystallization of zircons and REE minerals, combined with variations of major and trace element concentrations in the Li-micas, notably an enrichment of rare metals (W-Sn-Ta-Nb) in the Li-micas, implies emplacement of a hidden peralkaline REE-rich magma during the crystallization of the banded quartz veins, a source which was different to the pre-existing peraluminous granites. The possible involvement of both peraluminous and peralkaline intrusives suggests the existence of polyphase magmatic-hydrothermal systems in the Maoping deposit, during the Yanshanian event (190-80 Ma).

Magmatic and hydrothermal behavior of uranium in syntectonic leucogranites: The uranium mineralization associated with the Hercynian Guérande granite (Armorican Massif, France)

Ore Geology Reviews, 2017

Most of the hydrothermal uranium (U) deposits from the European Hercynian belt (EHB) are spatiall... more Most of the hydrothermal uranium (U) deposits from the European Hercynian belt (EHB) are spatially associated with Carboniferous peraluminous leucogranites. In the southern part of the Armorican Massif (French part of the EHB), the Guérande peraluminous leucogranite was emplaced in an extensional deformation zone at ca. 310 Ma and is spatially associated with several U deposits and occurrences. The apical zone of the intrusion is structurally located below the Pen Ar Ran U deposit, a perigranitic vein-type deposit where mineralization occurs at the contact between black shales and Ordovician acid metavolcanics. In the Métairie-Neuve intragranitic deposit, uranium oxide-quartz veins crosscut the granite and a metasedimentary enclave.

Nb-Ti-Y-HREE-W-U Oxide Minerals With Uncommon Compositions Associated With the Tungsten Mineralization In the Puy-Les-Vignes Deposit (Massif Central, France): Evidence For Rare-Metal Mobilization By Late Hydrothermal Fluids With A Peralkaline Signature

The Canadian Mineralogist, 2015

The Puy-les-Vignes deposit, located in the northwestern part of the French Massif Central, is a r... more The Puy-les-Vignes deposit, located in the northwestern part of the French Massif Central, is a remarkable occurrence in the West European Variscan belt of hydrothermal tungsten mineralization associated with a breccia pipe structure. The late stage of the mineralization consists of a mineral paragenesis composed of zircon, xenotime, monazite, Nb-FeW rutile, and Nb-Ti-Y-HREE-W-U oxide minerals (hereafter referred to as NTox) within an adularia-tourmaline-chlorite matrix. This study is focused on these rare-metal oxides, which display complex internal textures and uncommon chemical compositions with variable concentrations of Nb, Ti, Y, HREE, and W, not described until now. They are characterized by low microprobe totals (76 to 95%), together with the presence of OHgroups within the crystallographic structure as detected by FTIR spectroscopy, which is interpreted as the result of alteration, such as hydration and/or metamictization. The crystallochemical study shows that these crystals appear as a complex multi-polar solid solution, involving chemical mixing between two groups of binary solid solutions: a first group of anatase-columbite solid solution and a second group of euxenite-(Y)-columbite solid solution. Interpretation of their internal texture and their chemistry suggest that the NTox were formed during multi-phase crystallization in an open system by the mixing of two different hydrothermal fluids: a first fluid (L 1) enriched in Ti4Nb, Fe, and W, with the same geochemical signature as the main mineralization, and a second fluid (L 2) enriched in Nb4Ti, Fe, Y, REE, and W, with a geochemical signature clearly contrasting with the former and coeval with the crystallization of adularia, xenotime, monazite, zircon, and rutile. This mineral paragenesis is characterized by a P, Y, HREE, Nb 4 Ta, Ti, Zr, and U geochemical signature, typical of raremetal peralkaline magmatism, thus suggesting rare-metal mobilization by late hydrothermal fluids with a peralkaline signature, likely derived from an unknown source at depth (e.g., NYF pegmatites or related granite), during the late metallogenic stages at Puy-les-Vignes.

Hydrothermal Activity Related to Perigranitic W-Sn Mineralization in the Maoping deposit (Jiangxi, China)

The Jiangxi province (South China) is currently the world's leading tungsten (W) producer. Wo... more The Jiangxi province (South China) is currently the world's leading tungsten (W) producer. Wolframite ((Fe,Mn)WO4) and cassiterite (SnO2) are hosted in quartz veins associated to polyphased granite intrusions. The respective implications of magmatic vs non-magmatic fluids in the ore-forming process is still controversial. This study focuses on (i) establishing a detailed paragenetic sequence for the Maoping deposit and (ii) acquiring fluid inclusion microthermometric and Raman data in transparent gangue minerals. Six successive veins filling stages have been identified. Stage I and II correspond to feldspath-only and quartz-zinnwaldite veins respectively. Stage III corresponds to mostly quartz-topaz-wolframite-cassiterite-zinnwaldite veins. Stage IV corresponds to metric banded quartz veins with zinnwaldite, feldspar and rare earth minerals underlining the banding. Stage V is mostly characterized by kaolinite, fluorite and various sulfides. Fluid inclusions in Stage III to V qua...

Min. Dep. - Look Inside - Fluids preserved in variably altered graphitic pelitic schists in the DuffereinLake Zone

The uranium mineralization of Pen Ar Ran (Armorican Massif), France: An atypical "vein type" deposit

Mineralogical Magazine, 2013

Twenty percent of the uranium produced in France was extracted in the Armorican Massif, in three ... more Twenty percent of the uranium produced in France was extracted in the Armorican Massif, in three different locations (Pontivy, Guerande et Mortagne) which belong to the "High Heat Production Belt", a 100 km wide NW-SE zone characterized by elevated contents in radioactive elements present in most of the geological formations [1], including 320 to 315 Ma old peraluminous granites [2]. In the Guerande uranium district, the Pen Ar Ran deposit is located in a deformed zone, at the contact between porphyroids and quartzitic black schists. This deformed zone corresponds to an E-W shear zone that affected both the metamorphic formations (porphyroids and black schists) and the intrusive Guerande leucogranite, during its emplacement. Mineralization is under the form of massive veins carrying pechblende and sulphide that are spatially associated with the leucogranite. However, this uranium deposit is different from the other "vein type" known in France because of the unusu...

Encyclopedia of Earth Sciences Series, 2016

Granite-related uranium deposits in Argentina: Geological context and new metallogenetic studies

Vienna International Centre. International Atomic Energy Agency, Nov 1, 2020

In Argentina, Devonian-Carboniferous magmatism has played a very relevant role in uranium metallo... more In Argentina, Devonian-Carboniferous magmatism has played a very relevant role in uranium metallogenesis, driving magmatic and late-magmatic preconcentration processes, both within and in the periphery of the granitic massifs. This research has characterized different types and subtypes of uranium deposits linked to that fertile magmatism. These new studies on uranium minerals from uranium sites of interest have improved the metallogenetic knowledge of the granite-related uranium deposits, which in turn could aid the exploration for similar uranium deposits. It was determined that granites play an important role both as a uranium source and hosts of diverse types of uranium mineralization. Additionally, it is thought that, at the existing level of knowledge, there are prospects for the discovery and development of new uranium resources related to granites in Argentina.Fil: Álvarez, J.. Comisión Nacional de Energía Atómica; ArgentinaFil: Parra, F.. Comisión Nacional de Energía Atómica; ArgentinaFil: Anzil, Patricia Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica; ArgentinaFil: Bello, C.. Comisión Nacional de Energía Atómica; ArgentinaFil: Ceballos, E.. Comisión Nacional de Energía Atómica; ArgentinaFil: Salvatore, M.. Comisión Nacional de Energía Atómica; ArgentinaFil: Scarlatta, L.. Comisión Nacional de Energía Atómica; ArgentinaFil: Miyno, S.. Comisión Nacional de Energía Atómica; ArgentinaFil: Felkai, E.. Comisión Nacional de Energía Atómica; ArgentinaFil: Ferreyra, P.. Comisión Nacional de Energía Atómica; ArgentinaFil: Zelaya, A.. Comisión Nacional de Energía Atómica; ArgentinaFil: Cuney, M.. Université de Lorraine; FranciaFil: Mercadier, J.. Université de Lorraine; FranciaFil: Hanly, A.. International Atomic Energy Agency (iaea);Fil: Lira, Raul. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Museo de Mineralogía y Geología "Dr. A. Stelzner"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentin

Petrogenesis of the late Paleoproterozoic Gleibat Lafhouda dolomite carbonatite (West African Craton Margin, Moroccan Sahara) and its relevance to the onset of fragmentation of the Columbia supercontinent

Chemical Geology, 2022