Papers by Mohammad Lankarani
The succession of Permian rocks in Alborz region is composed of siliciclastic and carbonate facie... more The succession of Permian rocks in Alborz region is composed of siliciclastic and carbonate facies. All of the sediments were deposited in the Paleotethyan passive continental margin but they show different facies architecture and paleoenvironmental condition in various parts of the region. This study, as part of a wider project, has investigated sedimentary facies and paleoenvironment of the Permian rocks
The Permian rocks in Gaduk Area (east of Firuzkuh, Central Alborz) occur as a mixed siliciclastic... more The Permian rocks in Gaduk Area (east of Firuzkuh, Central Alborz) occur as a mixed siliciclastic-carbonate succession, dominated by siliciclastic facies (Doroud Formation) in the lower and carbonate facies (Ruteh Formation) in the upper half. This succession overlies the Lower Carboniferous Mobarak Formation and is underlain by Lower Triassic carbonates of Elikah Formation unconformably. Field studies and Laboratory measurements resulted in recognition of 4 terrigenous and 13 carbonate facies in the studied section. Siliceous cemented oligomictic orthoconglomerate and quartzarenite, calcite cemented quartzarenite (Lc–bearing in places), and red siltstone are common terrigenous facies. Fair laminated homogenous dolomite to lime mudstone, peloid grainstone/packstone, bioclast oncoid grainstone/packstone, bioturbiated bioclast wackestone/packstone, sandy ooid grainstone, green algal bioclast grainstone, sandy bioclast grainstone/rudstone, oriented sandy bioclast packstone, sandy bioclast floatstone, cephalopod bioclast wackestone and sponge spicule bioclast wackestone are common carbonate facies. A homoclinal carbonate ramp, with scattered patch reefs and a siliciclasticshallow marine system (siliciclastic shelf) were interpreted as depositional environment of the carbonate and terrigenous facies respectively. Results from this study show that sedimentation in the area commenced with siliciclastic facies, after the early Permian eustatic sea-level rise. This shelf was gradually changed into a carbonate ramp setting mostly due to relative sea level rise, result of which occurred as development of Middle Permian deposits. Lack of Upper Permian deposits is related to a regional sea level fall, which resulted in development of a laterite horizon in the area.
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Papers by Mohammad Lankarani