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| Magnetostratigraphy of the late Cenozoic Laojunmiao anticline in the northern Qilian Mountains and its implications for the northern Tibetan Plateau uplift | |
| 作者姓名： | FANG Xiaomin ZHAO Zhijun LI Jijun YAN Maodu PAN Baotian SONG Chunhui & DAI Shuang . Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing China . Key Laboratory of Western China's Environmental Systems Ministry of Education & College of Resources and Environment Lanzhou University Lanzhou China . College of Geography Nanjing Normal University Nanjing China |
| 作者单位： | FANG Xiaomin1，2，ZHAO Zhijun3，2，LI Jijun2，YAN Maodu2，PAN Baotian2，SONG Chunhui2 & DAI Shuang2 1. Institute of Tibetan Plateau Research，Chinese Academy of Sciences，Beijing 100085，China; 2. Key Laboratory of Western China's Environmental Systems，Ministry of Education & College of Resources and Environment，Lanzhou University，Lanzhou 730000，China; 3. College of Geography，Nanjing Normal University，Nanjing 210097，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)，中国科学院"百人计划" |
| 摘 要： | The uplift process of the Qinghai-Tibetan Plateau holds the key to understand the dynamic mechanisms of continental crust shortening and mountain-building and to test the relationship between the Tibetan uplift and tectonic-climatic coupling and environmental im-pacts1―4].However,there are still many debates in the process and mechanism of how the Tibetan Plateau uplifted to the present configuration.Among various approaches to solve these key questions,dating of the Cenozoic stratigraphy … |
Magnetostratigraphy of the late Cenozoic Laojunmiao anticline in the northern Qilian Mountains and its implications for the northern Tibetan Plateau uplift |
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| FANG Xiaomin,,ZHAO Zhijun,,LI Jijun,YAN Maodu,PAN Baotian,SONG Chunhui & DAI Shuang . Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing ,China, . Key Laboratory of Western China''''s Environmental Systems,Ministry of Education & College of Resources and Environment,Lanzhou University,Lanzhou ,China, . College of Geography,Nanjing Normal University,Nanjing ,China.Magnetostratigraphy of the late Cenozoic Laojunmiao anticline in the northern Qilian Mountains and its implications for the northern Tibetan Plateau uplift[J].Science in China(Earth Sciences),2005,48(7). | |
| Authors: | FANG Xiaomin Zhao Zhijun LI Jijun YAN Maodu PAN Baotian SONG Chunhui DAI Shuang |
| Institution: | 1. Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China;Key Laboratory of Western China's Environmental Systems, Ministry of Education & College of Resources and Environment, Lanzhou University, Lanzhou 730000, China 2. Key Laboratory of Western China's Environmental Systems, Ministry of Education & College of Resources and Environment, Lanzhou University, Lanzhou 730000, China;College of Geography, Nanjing Normal University, Nanjing 210097, China 3. Key Laboratory of Western China's Environmental Systems, Ministry of Education & College of Resources and Environment, Lanzhou University, Lanzhou 730000, China |
| Abstract: | Cenozoic sediments in the foreland basin--Jiuquan Basin in west Hexi Corridor recorded tectonic uplift information of the Qilian Mountains. High resolution paleomagnetic dating of the Laojunmiao (LJM) section across the central LJM anticline in the southern Jiuquan Basin reveals ages of the Getanggou Member, Niugetao Member in the Shulehe Formation, the Yumen Conglomerate, Jiuquan Conglomerate and Gobi Formation at >13-8.3 Ma, 8.3-4.9 Ma, 3.66-0.93 Ma, 0.84-0.14 Ma and 0.14-0 Ma, respectively. Sedimentary evolution study suggests that the Qilian Mountains should begin to rise gradually since ～8-6.6 Ma, accompanied by sedimentary environments changing from lacustrine mudstones-sandstones to alluvial conglomerates. Rapid uplift of the Qilian Mountains began at ～3.66 Ma, followed by a series of stepwise or intermittent intensive uplifts at about <1.8-1.23 Ma, 0.93-0.84 Ma and 0.14 Ma, which finally resulted in the present high Qilian Mountains. |
| Keywords: | Qilian Mountains Qinghai-Tibetan Plateau Jiuquan Basin magnetostratigraphy |
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