Paleomagnetic chronology and records of Himalayan uplift on the Longgugou section of Gyirong-Oma Basin in Xizang (Tibet)
Abstract
We study the Neogene sedimentary environment of the Longgugou section in the Gyirong-Oma Basin, Xizang (Tibet) by means of paleomagnetic chronology. Analogy shows that Cenozoic fault-bounded basin on the north slope of Himalayas formed by 7.2MaB.P. And it shrank and died 3.2 MaB.P. It marked that the region around the Himalayas had experienced intensified uplift covering the interval from 7.2 to 3.2MaB.P. The age of Hipparion fossils localitied in the Longgugou section is about 7.0~6.7MaB.P. In comparison with Hipparion fauna in North China, they should have similar geographic and climatic environment. Since the continual rise of the Himalayas, the fault-bounded basin subsided and the lake-basins attainted the biggest area during the period of 5.9~3.6 MaB.P. With the uplift of the Qinghai-Xizang Plateau and the subsidence of plain of North China, the topography of the west became higher than that of the east, and there had occurred great change in climatic environment between these two regions. For the reason of continually intensified uplift of Qinghai-Xizang 3.6MaB.P., the rivers in the west region cut through the ancient lake-basins and the lake basin of Gyirong-Oma contracted 3.2 MaB.P., died out 1.7 MaB.P., and then stepped into the stage of erosion and dissection. Show more
Publication status
publishedExternal links
Journal / series
Chinese Journal of GeophysicsVolume
Pages / Article No.
Publisher
Kexue ChubansheSubject
Gyirong-Oma basin of Xizang; Paleomagnetic chronology; Hipparion fauna; Himalayan upliftOrganisational unit
03734 - Jackson, Andrew / Jackson, Andrew
Notes
Abstract in English.More
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