Chemo-and Biostratigraphy of the Jurassic Oil Shales from the Qiangtang Basin,Northern Tibet,China:A Case Study of the Toarcian Oceanic Anoxic Event

查看全文 作　　者：CHEN [1]Lan;XU [1,2,3]Guiwen;DA [1]Xuejuan;YI [4]Haisheng;ZHU [1]Zhangxiong;HUANG [1]Zhaohui;LI [1]Xiaogang

机构地区：[1]Chongqing University of Science and Technology,Chongqing 401331,China;[2]State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,99 West Lincheng Road,Guiyang 550081,China;[3]University of Chinese Academy of Sciences,Beijing 100049,China;[4]Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,Sichuan,China

出　　处：《Acta Geologica Sinica(English Edition)》索引2017年第91卷第2期,共14页

基　　金：supported by the National Natural Science Foundation of China(grants No.41102066,41572095 and 41572089);Opening Foundation of the State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences(grant No.201008);State Key Laboratory of Marine Geology,Tongji University(grant No.MGK1703) 摘　　要：The marine oil shales of the Qiangtang Basin, northern Tibet, exposed in the Biluo Co, Tuonamu, Shenglihe and Changsheshan areas are believed to be important petroleum source rocks. This work comprehensively analyzed the carbon isotopes, trace elements, and calcareous nannofosills, ammonites and bivalves of the Biluo Co section in the Qiangtang Basin. The organic carbon isotopes show a positive excursion close to 2.17‰(relative to PDB), which, albeit significantly smaller, may also be associated with other Early Toarcian Oceanic Anoxic Events(T-OAE) in the European epicontinental seas and the Tethyan continental margins. Coinciding with the Early Toarcian transgression, the oxygen deficiency in bottom water had led to dysoxic-anoxic conditions and deposition of black shales lacking benthic fauna. Under such condition, the redox-sensitive trace metals such as Mo, V, Ni, Cr, and U were enriched, in conjunction with high planktonic productivity of Watznaueriaceae calcareous nannofossils. Comparison of the results with the records of chemo-and biostratigraphy, as well as the palaeogeography during the Early Jurassic suggests that the anoxia linked to the Early Toarcian oceanic anoxic event was mainly caused by the high surface water temperature, sea-level rise and an increase of surface water productivity. 关键词：大洋缺氧事件羌塘盆地生物地层西藏北部油页岩化学侏罗系有机碳同位素

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Chemo-and Biostratigraphy of the Jurassic Oil Shales from the Qiangtang Basin,Northern Tibet,China:A Case Study of the Toarcian Oceanic Anoxic Event

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