The uplifting process of the Bogda Mountain during the Cenozoic and its tectonic implication |
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| Authors: | ZongXiu Wang Tao Li Jin Zhang YongQing Liu ZongJin Ma |
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| Institution: | (1) Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081, China;(2) Institute of Geology, China Seismological Administration, Beijing, 100029, China;(3) Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China |
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| Abstract: | The Tianshan Mountains have undergone its initial orogeny, extension adjusting and re-orogeny since the Late Paleozoic. The re-orogeny and uplifting process of the orogeny in the Mesozoic and Cenozoic are two of most important events in the geological evolution of Euro-Asian continent, which resulted in the formation of the present range-and-basin pattern in topography of the Tianshan Mountains and its adjacent areas. Thermochronology results by the method of fission-track dating of apatite suggest three obvious uplifting stages of the Bogad Mountain Chain re-orogeny during the Cenozoic, i.e. 5.6-19 Ma, 20-30 Ma, and 42-47 Ma. The strongest uplifting stage of the mountain is the second one at 20 -30 Ma, when the mountain uplifted as a whole, and the beginning of re-orogeny was no less than 65 Ma. Furthermore, our studies also show that the uplifting types of the mountain are variable in the dif-ferent time periods, including uplifting of mountain as a whole and differential uplifting. The apparently diversified uplifting processes of the mountain chain are characterized by the migration (or transfor-mation) of the uplifting direction of the mountain from west to east and from north to south, and the main process of mountain extending is from north to south. |
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| Keywords: | Bogda Mountain Chain re-orogeny uplifting thermochronology fission track |
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