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| New evidence from stable isotope for the uplift of mountains in northern edge of the Qinghai-Tibetan Plateau | |
| 作者姓名： | 陈正乐 王小凤 冯夏红 王长秋 刘健 |
| 作者单位： | Institute of Geomechanics Chinese Academy of Geological Sciences Beijing 100081 China，Institute of Geomechanics Chinese Academy of Geological Sciences Beijing 100081 China，Department of Earth Sciences Dartmouth College Hanover NH 03755 USA，Department of Geology Peking Universily Beijing 100871 China，Institute of Geomechanics Chinese Academy of Geological Sciences Beijing 100081 China |
| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划) |
| 摘 要： | New data of oxygen and carbonate isotope in calcite cements from Cenozoic rocks inthe Jianggelesayi area to reconstruct the uplift history of mountains in northern edge of the Qing-hai-Tibetan Plateau are presented. Analyses results show that rapid changes of δ~(18)O and δ~(13)C inthe calcite cement occurred in both the Early Oligocene and Early Miocene. Studies on sedimen-tary features indicate that a rapid up-coarsing of the sediments size occurred in the Early Miocene,and sedimentary velocity increased rapidly during the Pliocene and Early Quaternary. Thus, it issuggested that the uplift of mountains in the northern edge of the Qinghai-Tibetan Plateau initiatedfrom the Early Oligocene, and a rapid uplift occurred in the early stage of the Miocene, while thesharp difference in topography between the northern plateau and the Tarim Basin predominatelyformed later than the Miocene. |
New evidence from stable isotope for the uplift of mountains in northern edge of the Qinghai-Tibetan Plateau |
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| CHEN Zhengle,WANG Xiaofeng,FENG Xiahong,WANG Changqiu LIU Jian.New evidence from stable isotope for the uplift of mountains in northern edge of the Qinghai-Tibetan Plateau[J].Science in China(Chemistry),2002,45(Z1). | |
| Authors: | CHEN Zhengle WANG Xiaofeng FENG Xiahong WANG Changqiu LIU Jian |
| Institution: | 1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China 2. Department of Earth Sciences, Dartmouth College, Hanover, NH 03755, USA 3. Department of Geology, Peking University, Beijing 100871, China |
| Abstract: | New data of oxygen and carbonate isotope in calcite cements from Cenozoic rocks in the Jianggelesayi area to reconstruct the uplift history of mountains in northern edge of the Qinghai-Tibetan Plateau are presented. Analyses results show that rapid changes of Δ18o and Δ13c in the calcite cement occurred in both the Early Oligocene and Early Miocene. Studies on sedimentary features indicate that a rapid up-coarsing of the sediments size occurred in the Early Miocene, and sedimentary velocity increased rapidly during the Pliocene and Early Quaternary. Thus, it is suggested that the uplift of mountains in the northern edge of the Qinghai-Tibetan Plateau initiated from the Early Oligocene, and a rapid uplift occurred in the early stage of the Miocene, while the sharp difference in topography between the northern plateau and the Tarim Basin predominately formed later than the Miocene. |
| Keywords: | northern Qinghai-Tibetan Plateau uplift history of mountains stable isotope |
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