Climatic and Tectonic Evolution in the North Qaidam since the Cenozoic: Evidence from Sedimentology and Mineralogy  

作　　者：王朝文 洪汉烈 李朝晖 梁国军 谢瑾 宋博文 宋鄂平 张克信 

机构地区：[1]State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences [2]Faculty of Earth Sciences, China University of Geosciences [3]Geological Survey of China University of Geosciences [4]State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences

出　　处：《Journal of Earth Science》2013年第3期314-327,共14页地球科学学刊（英文版）

基　　金：supported by the China Geological Survey(No.1212011121261);the National Natural Science Foundation of China(Nos.41272053and41072030);Specialized Research Fund for the Doctoral Program of Higher Education of China(No.20110145110001);the Independent Research Project Foundation of State Key Laboratory of Biogeology and Envi-ronmental Geology,China University of Geosciences,Wuhan(No.GBL11307)

摘　　要：Clay mineralogy and bulk mineral composition of Tertiary sediments in Qaidam were investigated using X-ray diffraction （XRD） and scanning electron microscopy in order to better understand regional climate change resulting from uplift of the Northeast Tibetan Plateau. Climate change in Qaidam since -53.5 Ma could be divided into four stages： a warm and seasonally arid climate between -53.5 and 40 Ma, a cold and arid climate from -40 to 26 Ma, a warm and humid climate between -26 and 13.5 Ma, and a much colder and arid climate from -13.5 to 2.5 Ma, respectively. The illite crystallinity and sedimentary facies suggested that uplift events took place around ＆gt;52–50, -40–38, -26–15, -10–8, and ＆lt;5 Ma inthe Qaidam region, respectively. The climate in Qaidam Basin could have been controlled by global climate prior to 13.5 Ma. As the Tibetan Plateau reached a significant elevation by -13.5 Ma, and the climate cycles of the East Asian monsoon might add additional influence.Clay mineralogy and bulk mineral composition of Tertiary sediments in Qaidam were investigated using X-ray diffraction （XRD） and scanning electron microscopy in order to better understand regional climate change resulting from uplift of the Northeast Tibetan Plateau. Climate change in Qaidam since -53.5 Ma could be divided into four stages： a warm and seasonally arid climate between -53.5 and 40 Ma, a cold and arid climate from -40 to 26 Ma, a warm and humid climate between -26 and 13.5 Ma, and a much colder and arid climate from -13.5 to 2.5 Ma, respectively. The illite crystallinity and sedimentary facies suggested that uplift events took place around ＆gt;52–50, -40–38, -26–15, -10–8, and ＆lt;5 Ma inthe Qaidam region, respectively. The climate in Qaidam Basin could have been controlled by global climate prior to 13.5 Ma. As the Tibetan Plateau reached a significant elevation by -13.5 Ma, and the climate cycles of the East Asian monsoon might add additional influence.

关 键 词：clay mineral illite crystallinity PALEOCLIMATE Qaidam Basin Tibetan Plateau. 

分 类 号：P548[天文地球—构造地质学]