Mineralogy and element geochemistry of the Sohnari rocks of Early Eocene Laki Formation in the Southern Indus Basin,Pakistan:Implications for paleoclimate,paleoweathering and paleoredox conditions
作者机构：Centre for Pure&Applied GeologyUniversity of SindhJamshoro76080Pakistan Xinjiang Centre for Mineral ResourcesXinjiang Institute of Ecology and GeographyUrumqiXinjiang830011China College of GeosciencesChina University of PetroleumBeijing102249China State Key Laboratory of Petroleum Resources and ProspectingChina University of PetroleumBeijing102249China School of Resources and Environmental EngineeringHefei University of TechnologyHefei Anhui230009China
出 版 物：《Energy Geoscience》 (能源地球科学（英文）)
年 卷 期：2023年第4卷第1期
页 面：143-157页
核心收录：
学科分类：070902[理学-地球化学] 070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学]
基 金：Centre for Pure and Applied Geology University of Sindh
主 题：Mineralogy Geochemistry Paleoclimate Sohnari Southern indus basin Lakhra
摘 要：The Sohnari Member of the Early Eocene Laki Formation is massively deposited in the Southern Indus Basin of Pakistan and is considered a potential source rock to generate ***,the detailed paleoclimatic,paleoweathering,and depositional conditions of the Sohnari Member have not been studied *** research mainly discusses the detailed mineralogical(bulk and clay)and elemental geochemistry of the Laki Formation from two outcrop sections(Jhimpir and Lakhra)in the Southern Indus Basin,*** bulk minerals,including quartz(low),hematite,calcite,halite,gypsum,and clay minerals such as kaolinite,chlorite,smectite and illite have been discussed *** results demonstrate the paleo-environment of studied area was arid with enhanced saline and weak to strong oxidizing depositional *** chemical index of alteration(CIA)values in Jhimpir and Lakhra sections are in the ranges of 41.30-97.93 and 22.30-96.19,respectively,indicating that the Sohnari sediments experienced weak to intense chemical weathering in the source *** interpretation of the A-CN-K ternary diagram is consistent with the clay mineral contents in the studied sediments,which is characterized by the predominance of kaolinite,gibbsite and chlorite,demonstrating the weak to strong weathering state under warm and humid climatic *** chemical indices such as Sr/Ba,δU,V/Cr,Ni/Co,and Cu/Zn,U/Th and Ba/Ga show that Sohnari rocks of Early Eocene Laki Formation underwent strong evaporation,oxic water column with warm to humid and minor contact of cold climatic *** on our present data,it can be concluded that the sediments of Sohnari Member of Laki Formation from Jhimpir and Lakhra areas of Southern Indus Basin in Pakistan are related to Indio-Eurasian collision and came from the Indian shield rocks that were deposited in a brackish water body with a minor contact of the freshwater oxidizing paleo-environment depositional conditions.
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