东昆仑东段第四纪成山作用过程与地貌变迁

王国灿; 吴燕玲; 向树元; 贾春兴

Volume 28 Issue 6

Nov. 2003

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WANG Guo-can, WU Yan-ling, XIANG Shu-yuan, JIA Chun-xing, 2003. Mountain Building Process and Geomorphic Migration of Eastern Kunlun Mountains during Quaternary. Earth Science, 28(6): 583-592.

Citation:

WANG Guo-can, WU Yan-ling, XIANG Shu-yuan, JIA Chun-xing, 2003. Mountain Building Process and Geomorphic Migration of Eastern Kunlun Mountains during Quaternary. Earth Science, 28(6): 583-592.

WANG Guo-can, WU Yan-ling, XIANG Shu-yuan, JIA Chun-xing, 2003. Mountain Building Process and Geomorphic Migration of Eastern Kunlun Mountains during Quaternary. Earth Science, 28(6): 583-592.

Citation:

WANG Guo-can, WU Yan-ling, XIANG Shu-yuan, JIA Chun-xing, 2003. Mountain Building Process and Geomorphic Migration of Eastern Kunlun Mountains during Quaternary. Earth Science, 28(6): 583-592.

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Mountain Building Process and Geomorphic Migration of Eastern Kunlun Mountains during Quaternary

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Institute of Qinghai Geological Survey, Xining 810012, China

Received Date: 2003-05-15
Publish Date: 2003-11-25

Abstract

Abstract

The relief in the eastern Kunlun Mountains, northeast Tibetan plateau is characteristic of a series of NWW-SEE ranges alternating with basins or valleys. The distribution of Quaternary deposits and facies match well with the relief, exposing the mountain building process. The obvious relief differentia first appeared in the north of Buerhanbuda Mountain, represented by the first occurrence of the fluvial deposits at its south foot in the mid-late Early Pleistocene (after 1 525 ka). While the molding of the Maerzheng-Buqing Mountain happened in the later Early Pleistocene, when a so-called Kunlun-Yellow River movement affected an extensive area, the eastern Kunlun Mountains and the headstreams of the Yellow River. The Chahaxili Mountains in the south of our research area were also affected by this event which is inferred by the change from lacustrine deposits to pluvial or alluvial deposits at about 1 113.9-979.6 ka. However, the fact that there are still the deposition area in Chahaxili Mountain area shows that it didn't plump up at that time. Hence, the provenance of the pluvial or alluvial deposits, coming from the north and related to the uplift of the Maerzheng-Buqing Mountain, can be deduced by statistics of the gravel composition and the gravel array. It is concluded that the molding of the Chahaxili Mountains could have occurred in the Late Pleistocene. On the other hand, the good matching relationship between the Pleistocene extension fractures and the relief framework indicates that the mountain building process should be extension-controlled, mainly N-S. This N-S extension should be related to the collapse and equilibrium adjusting of the north edge of the Tibetan plateau caused by gravity unbalance after its being uplifted. The transfer of the mountains building process from north to south implies that the collapse developed from north to south.
- eastern Kunlun,
- Quaternary,
- mountain building process,
- extensional structure

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References(24)

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