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| Constraining the stepwise migration of the eastern Tibetan Plateau margin by apatite fission track thermochronology | |
| 作者姓名： | LAI QingZhou ? DING Lin WANG HongWei YUE YaHui & CAI FuLong Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing China |
| 作者单位： | LAI QingZhou1，2?，DING Lin2，WANG HongWei1，YUE YaHui1 & CAI FuLong1 1 Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China; 2 Institute of Tibetan Plateau Research，Chinese Academy of Sciences，Beijing 100085，China |
| 基金项目： | 中国科学院资助项目;科技部资助项目;国家自然科学基金 |
| 摘 要： | Granites sampled from Garzê-Litang thrust, Longmen Shan thrust, Garzê and Litang strike-slip faults in the eastern Tibetan Plateau have been analyzed with apatite fission track thermochronological method in this study. The measured fission track apparent ages, combined with the simulated annealing mod- eling of the thermal history, have been used to reconstruct the thermal evolutionary histories of the samples and interpret the active history of the thrusts and faults in these areas. Thermal history mod- eling shows that earlier tectonic cooling occurred in the Garzê-Litang thrust in Miocene (~20―16 Ma) whereas the later cooling occurred mainly in the Longmen Shan thrust since ~5 Ma. Our study sug- gests that the margin of eastern Tibetan Plateau was extended by stages: through strike-slip faults deformations and related thrusts, the upper crust formed the Garzê-Litang margin in the Miocene epoch and then moved to the Longmen Shan margin since ~5 Ma. During this process, the deformations of different phases in the eastern Tibetan Plateau were absorbed by the thrusts within them and conse- quently the tectonic events of long-distance slip and extrusion up to hundreds of kilometers have not been found. |
| 收稿时间： | 5 April 2006 |
| 修稿时间： | 7 June 2006 |
Constraining the stepwise migration of the eastern Tibetan Plateau margin by apatite fission track thermochronology |
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| Lai?QingZhou,Ding?Lin,Wang?HongWei,Yue?YaHui,Cai?FuLong.Constraining the stepwise migration of the eastern Tibetan Plateau margin by apatite fission track thermochronology[J].Science in China(Earth Sciences),2007,50(2):172-183. | |
| Authors: | Lai QingZhou Ding Lin Wang HongWei Yue YaHui Cai FuLong |
| Institution: | 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China 2. Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100085, China 3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
| Abstract: | Granites sampled from Garzê-Litang thrust, Longmen Shan thrust, Garzê and Litang strike-slip faults in the eastern Tibetan Plateau have been analyzed with apatite fission track thermochronological method in this study. The measured fission track apparent ages, combined with the simulated annealing modeling of the thermal history, have been used to reconstruct the thermal evolutionary histories of the samples and interpret the active history of the thrusts and faults in these areas. Thermal history modeling shows that earlier tectonic cooling occurred in the Garzê-Litang thrust in Miocene (∼20–16 Ma) whereas the later cooling occurred mainly in the Longmen Shan thrust since ∼5 Ma. Our study suggests that the margin of eastern Tibetan Plateau was extended by stages: through strike-slip faults deformations and related thrusts, the upper crust formed the Garzê-Litang margin in the Miocene epoch and then moved to the Longmen Shan margin since ∼5 Ma. During this process, the deformations of different phases in the eastern Tibetan Plateau were absorbed by the thrusts within them and consequently the tectonic events of long-distance slip and extrusion up to hundreds of kilometers have not been found. Supported by Chinese Academy of Sciences (Grant No. KZCX3-SW-143), Chinese Ministry of Science and Technology (Grant No. 2002CB412602) and the National Natural Science Foundation of China (Grant No. 40234049) |
| Keywords: | Tibetan Plateau fission track thermal history modeling margin migration constraining |
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