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Geological implications of elements of the Pleistocene mudstone with different organism compositions and enrichment environments in the Qaidam Basin,China

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Frontiers of Earth Science 2023年第2期17卷 437-454页

作者： Jinqi QIAO Qingyong LUO Chen ZHANG Zhenxue JIANG State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China Basin and Reservoir Research Center China University of PetroleumBeijing 102249China Unconventional Natural Gas Research Institute China University of PetroleumBeijing 102249China

Trace elements and rare earth elements(REEs)of two kinds of organic facies samples representing marginal and more basin-center deposits from Pleistocene lacustrine mudstones in the central Qaidam Basin were studied to understand the provenance,palaeotectonic setting,hydrothermal activity,palaeoredox conditions and sedimentary *** results show that the lacustrine mudstones were mainly derived from felsic sources with little contribution from ancient crustal sediments and no ultramafic(ophiolitic)*** mudstones were deposited in a continental island arc tectonic setting,which is consistent with the tectonic evolution of the Cenozoic *** two organic facies samples were hydrothermal in origin based on the ternary diagram of Ni–Zn–Co and normalized REE ***,this does not mean that the water column in paleolake was affected by hydrothermal fluids in *** signal might indicate hydrothermal origins from hot springs related to active faults around the basin rather than the deep hydrothermal fluids entering the sediments via deep faculties based on the comprehensive analyses of normalized REE patterns,negative E_(uanom)(Eu anomaly),Y/Ho,Sm/Yb,and Eu/*** proxies including U/Th,Ni/Co,and Mnanom values,are more sensitive for the studied samples indicating that most of the organic facies A samples were deposited under an oxygen-depleted condition,while the organic facies B samples were deposited under oxygen-rich *** proxies of Ceanom values are unavailable for the organic facies B samples due to hypersaline environments,and V/C_(r)and V/(V+Ni)are invalid for the organic facies A samples,possibly because of their organism *** low Lan/Ybn values indicate high sedimentation rates,which is consistent with the average sedimentation rates of approximately 0.43 to 1.1 km/***,the La_(n)/Yb_(n) is more likely affected by the provenance of the studied samples,so it should be used with caution.

关键词： elements lacustrine mudstone Pleistocene Qigequan Formation Qaidam Basin

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