| Magnetostratigraphy of Late Cenozoic fossil mammals in the northeastern margin of the Tibetan Plateau |
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| 作者姓名： | SONG Chunhui FANG Xiaomin GAO Junping NIE Junsheng YAN Maodu XU Xianhai & SUN Dong . MOE National Laboratory of Western China抯 Environmental Systems & College of Resource and Environment Lanzhou University Lanzhou China . State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi抋n China . |
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| 作者单位： | SONG Chunhui1，2，FANG Xiaomin 1，2，GAO Junping1，NIE Junsheng1，YAN Maodu1，3，XU Xianhai1 & SUN Dong1 1. MOE National Laboratory of Western China抯 Environmental Systems & College of Resource and Environment，Lanzhou University，Lanzhou 730000，China; 2. State Key Laboratory of Loess and Quaternary Geology，Institute of Earth Environment，Chinese Academy of Sciences，Xi抋n 710075，China; 3. Department of Geological Sciences，University of Michigan，AnnArbor，MI 48109，USA |
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| 摘 要： | ~~Magnetostratigraphy of Late Cenozoic fossil mammals in the northeastern margin of the Tibetan Plateau~~~~
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| 收稿时间： | 2002-06-25 |
Magnetostratigraphy of Late Cenozoic fossil mammals in the northeastern margin of the Tibetan Plateau |
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| Chunhui Song,Xiaomin Fang,Junping Gao,Junsheng Nie,Maodu Yan,Xianhai Xu,Dong Sun.Magnetostratigraphy of Late Cenozoic fossil mammals in the northeastern margin of the Tibetan Plateau[J].Chinese Science Bulletin,2003,48(2):188-193. |
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| Authors: | Chunhui Song Xiaomin Fang Junping Gao Junsheng Nie Maodu Yan Xianhai Xu Dong Sun |
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| Institution: | (1) MOE National Laboratory of Western China’s Environmental Systems & College of Resource and Environment, Lanzhou University, 730000 Lanzhou, China;(2) State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, 710075 Xi’an, China;(3) Department of Geological Sciences, University of Michigan, 48109 Ann Arbor, MI, USA |
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| Abstract: | A number of fossil mammals have been found in the very thick Cenozoic stratigraphy of the Guide Basin in the northeastern margin of the Tibetan Plateau.Some of these are of great significance in mammal evolution and stratigraphic correla-tion on and around the Tibetan Plateau and North China.However,the chronology of these mamals is poorly con-strained.Dating of the mammals will not only place precise age constraints on the mammals,but also provide much inlormation on the related stratigraphy that records the uplift process of the Tibetan Plateau.Detailed paleomagnetism of the upper part of the Cenozoic stratigraphy at He'erjia and Lajigai north of Guide County has revealed magnetic chrons that can be correlated to Ganss and 3An chrons.determining the section spanning about 3.16.5 Ma and the first.second and third layers of fossil mammals at about 5.25,5.1 and 4.4 Ma,respectively.Ages of the significant genus Gazella kueitensis and the Chinese elephant Anancus sinensis are firstly constrained at about 5.25 MaBP and 4.4 Ma,respectively.The mammalian evolution and the associated increase in coarse sediments and sedimentation rate may suggest that the northeastern Tibetan Plateau was uplifted rapidly at that time,and the eastern Tibetan Plateau with its neighboring regions was not high enough to stop mammal exchange between the northern and southern sides of the Tibetan Piateau. |
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| Keywords: | Tibetan Plateau Guide Basin Late Cenozoic stratigra-phy fossil mammals paleomagnetism |
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