Palaeoenvironment and palaeoclimate of the Middle to Late Jurassic revealed by geochemical records in northern margin of Qaidam Basin
Hu Junjie1, Ma Yinsheng1, Wang Zongxiu1, Liu Yongqing2, Gao Wanli1, Qian Tao1
1 Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081; 2 Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037
Abstract Geochemical characteristics of sedimentary rocks can indicate palaeoenvironment evolution process. The Jurassic sediments in northern margin of Qaidam Basin recorded significant palaeoenvironmental and palaeoclimatic information of northwest China. Based on the geochemical analysis of sedimentary rocks from the Dameigou standard geological profile in northern margin of Qaidam Basin,palaeoclimate and palaeoenvironment of the Middle to Late Jurassic were reconstructed. The results revealed that: (1)From the Middle to Upper Jurassic,it showed a shallow-water environment with oxic condition,deep lacustrine facies with anoxic condition only appeared in a short time occasionally. In general,the lacustrine water-body in the Jurassic displayed moderate palaeosalinity,but the decrease in precipitation may lead to salinity increase in some intervals. (2)Comprehensive utilization of multiple geochemical parameters,palaeoclimate evolution sequence of the Middle to Late Jurassic in northern margin of Qaidam Basin was established. According to the long-term records,the palaeotemperature and palaeohumidity fluctuation varied within a certain range. From the late Middle Jurassic,the palaeoclimate changed from warm and humid into hot and arid,which triggered the hot and arid palaeoenvironment of the Late Jurassic. The diversified geochemical profile of this study will provide new evidence and materials for the research on the Middle to Late Jurassic hot-arid climate event and palaeoclimate correlation in northwest China.
Fund:[Co-funded by the National Natural Science Foundation of China(No.41372109,41672111),the Young Scientists Foundation of National Natural Science Foundation of China(No.41602125),China Postdoctoral Science Foundation(No.2016M601085)and the Geological Survey Project of China Geological Survey(No.12120115003401)]
Corresponding Authors:
Ma Yinsheng,born in 1962,is a professor, and his research interest is tectonics and petroleum geology. E-mail: mayinsheng@sohu.com.
About author: Hu Junjie,born in 1987,is a postdoctor of the Institute of Geomechanics CAGS,with a Ph.D. degree obtained from the China University of Geosciences(Beijing). He is currently engaged in researches on Mesozoic sedimentary evolution and palaeoclimate variatioan. E-mail: howimet@foxmail.com.About the corresponding author Ma Yinsheng,born in 1962,is a professor, and his research interest is tectonics and petroleum geology. E-mail: mayinsheng@sohu.com.
Cite this article:
Hu Junjie,Ma Yinsheng,Wang Zongxiu et al. Palaeoenvironment and palaeoclimate of the Middle to Late Jurassic revealed by geochemical records in northern margin of Qaidam Basin[J]. JOPC, 2017, 19(3): 480-490.
Hu Junjie,Ma Yinsheng,Wang Zongxiu et al. Palaeoenvironment and palaeoclimate of the Middle to Late Jurassic revealed by geochemical records in northern margin of Qaidam Basin[J]. JOPC, 2017, 19(3): 480-490.
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