{"@attributes":{"version":"2.0"},"channel":{"title":"American Journal of Science","link":"https:\/\/ajsonline.org\/","description":"Founded in 1818 by Benjamin Silliman. The Journal is devoted to geology and related sciences.","language":"en","item":[{"title":"Facies Vectors: Disentangling Environmental Variability, Diagenesis, and Secular Change in Carbonate Stratigraphies","pubDate":"Mon, 08 Jun 2026 14:39:53 -0500","description":"We represent sampled points in a lower Cambrian section using field observations, image analyses, and geochemical measurements to test the null hypothesis of stratigraphic stasis.","guid":"https:\/\/doi.org\/10.2475\/001c.161588","link":"https:\/\/ajsonline.org\/article\/161588-facies-vectors-disentangling-environmental-variability-diagenesis-and-secular-change-in-carbonate-stratigraphies"},{"title":"Reversed Inter-Mineral Fe-Zn Isotope Fractionation in Ophiolitic Peridotites: Evidence for Widespread Hydration of Oceanic Lithospheric Mantle","pubDate":"Wed, 22 Apr 2026 11:25:31 -0500","description":"Fluid-assisted element exchange and subsolidus diffusion in various lithologies of the oceanic lithospheric mantle produce reversed inter-mineral isotope fractionation.","guid":"https:\/\/doi.org\/10.2475\/001c.160209","link":"https:\/\/ajsonline.org\/article\/160209-reversed-inter-mineral-fe-zn-isotope-fractionation-in-ophiolitic-peridotites-evidence-for-widespread-hydration-of-oceanic-lithospheric-mantle"},{"title":"Dependence of River Water Lithium Isotope Ratios on Watershed Attributes Complicates Interpretation of Weathering-Driven CO~2~ Drawdown","pubDate":"Mon, 30 Mar 2026 09:18:30 -0500","description":"...","guid":"https:\/\/doi.org\/10.2475\/001c.157531","link":"https:\/\/ajsonline.org\/article\/157531-dependence-of-river-water-lithium-isotope-ratios-on-watershed-attributes-complicates-interpretation-of-weathering-driven-co-2-drawdown"},{"title":"Heterogeneous Carbonate Lithium Isotope Records Across the end-Permian Mass Extinction Indicate a Highly Perturbed Lithium Cycle in the Early Triassic","pubDate":"Mon, 23 Mar 2026 10:10:25 -0500","description":"Variations in Early Triassic carbonate lithium isotopes are hypothesized to reflect diagenetic alteration and a poorly mixed oceanic Li reservoir that developed from extensive reverse weathering.","guid":"https:\/\/doi.org\/10.2475\/001c.156171","link":"https:\/\/ajsonline.org\/article\/156171-heterogeneous-carbonate-lithium-isotope-records-across-the-end-permian-mass-extinction-indicate-a-highly-perturbed-lithium-cycle-in-the-early-triassic"},{"title":"Carbon Isotope Trends of Precambrian-Cambrian Carbonates in Southwestern Laurentia Are Robust to Diagenetic Overprinting","pubDate":"Fri, 13 Feb 2026 10:48:50 -0600","description":"Carbon isotope (\u03b4^13^C) stratigraphic trends across the Precambrian-Cambrian boundary in southwestern Laurentia are insensitive to diagenetic overprinting despite an increase in fluid-buffered marine diagenesis.","guid":"https:\/\/doi.org\/10.2475\/001c.155346","link":"https:\/\/ajsonline.org\/article\/155346-carbon-isotope-trends-of-precambrian-cambrian-carbonates-in-southwestern-laurentia-are-robust-to-diagenetic-overprinting"},{"title":"Permian Syn-Extensional Barrovian Metamorphism in the Envelope of a Migmatite Dome of the Mongolian Altai \u2013 Petrostructural and Geochronological Arguments","pubDate":"Mon, 09 Feb 2026 15:00:47 -0600","description":"Petrochronology demonstrates that Barrovian metamorphism around a Permian metamorphic core complex in the Mongolian Altai, previously considered a signature of crustal thickening, was instead produced during crustal thinning.","guid":"https:\/\/doi.org\/10.2475\/001c.155605","link":"https:\/\/ajsonline.org\/article\/155605-permian-syn-extensional-barrovian-metamorphism-in-the-envelope-of-a-migmatite-dome-of-the-mongolian-altai-petrostructural-and-geochronological-argum"},{"title":"From Source Rock to Cinnabar \u2013 How the Giant Mercury Deposits in Earth\u2019s Crust Formed","pubDate":"Tue, 20 Jan 2026 14:56:31 -0600","description":"Mercury isotopes in cinnabar suggest an upper mantle origin, as 85% of samples plot near the origin, matching compositions from continental flood basalts like the Siberian Traps.","guid":"https:\/\/doi.org\/10.2475\/001c.147533","link":"https:\/\/ajsonline.org\/article\/147533-from-source-rock-to-cinnabar-how-the-giant-mercury-deposits-in-earth-s-crust-formed"},{"title":"A Basin in Transition: Ecological, Environmental, and Tectonic Shifts Across the Ediacaran\u2013Cambrian Boundary in the Nama Group, Kalahari Craton","pubDate":"Fri, 02 Jan 2026 19:38:25 -0600","description":"New research on late Ediacaran\u2013early Cambrian stratigraphy of Namibia\u2019s Nama Group revises biostratigraphic and chemostratigraphic age models for the terminal Ediacaran and advances understanding of the Nama Foreland Basin.","guid":"https:\/\/doi.org\/10.2475\/001c.151699","link":"https:\/\/ajsonline.org\/article\/151699-a-basin-in-transition-ecological-environmental-and-tectonic-shifts-across-the-ediacaran-cambrian-boundary-in-the-nama-group-kalahari-craton"},{"title":"Rare Earth Element-Mineralized Carbonatite in the Bear Lodge Alkaline Complex, USA\u2014Ore Genesis Implications From Fluid Inclusion Characterization","pubDate":"Fri, 17 Oct 2025 10:14:04 -0500","description":"Study of fluid inclusions in carbonatite of the Bear Lodge Alkaline Complex, Wyoming shows that alkali bicarbonate-sulfate brines were integral to early, light rare earth element mineralization within carbonatite intrusions.","guid":"https:\/\/doi.org\/10.2475\/001c.143992","link":"https:\/\/ajsonline.org\/article\/143992-rare-earth-element-mineralized-carbonatite-in-the-bear-lodge-alkaline-complex-usa-ore-genesis-implications-from-fluid-inclusion-characterization"},{"title":"Balancing Redox Budgets: Mechanisms for Prolonging Anoxia During Major Carbon Burial Events","pubDate":"Thu, 11 Sep 2025 10:27:42 -0500","description":"Oceanic Anoxic Events likely produced excess oxygen from burial of reduced carbon and sulfur, but Large Igneous Province reductants and oxidative weathering may balance this to maintain marine anoxia.","guid":"https:\/\/doi.org\/10.2475\/001c.143665","link":"https:\/\/ajsonline.org\/article\/143665-balancing-redox-budgets-mechanisms-for-prolonging-anoxia-during-major-carbon-burial-events"}]}}