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《Quaternary Sciences》 2008-02
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Shi Xuhua①② Wang Erchie③① Wang Gang③ Fan Chun③(①Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100085;②Graduate University of Chinese Academy of Sciences,Beijing 100049; ③Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029)  
The Yulong Snow Mountain,located at the southeastern margin of the Tibetan Plateau,has attracted researchers' attention by its unique geomorphic features.Within an area of 30×20km2 on the top of the mountain,considered a relict surface,there are 18 peaks in excess of 5000m in elevation.According to geologic and geomorphologic characteristics of this area and the elevation of the relict surface(4250m)referenced as the initial incision surface,the analyses by isostasy of the lithospheric elastic flexural model indicate that the erosion loss in the Hutiaoxia(Tiger Leap Gorge)caused isostatic rebound of the Yulong Snow Mountain and therefore resulted in an uplift of 468m of the mountain,which is solely contributed by erosion.The other topographic relief between the Yulong Snow Mountain and its surrounding area is caused by tectonic forcing,such as the normal faulting bounding the mountain.Therefore,the uplift of the Yulong Snow Mountain since Late Cenozoic is resulted from both erosion and tectonic forcing.The triggering factor for the isostatic rebound of this area is the development of the normal faulting on both the east and west sides of the mountain during 5.0~2.5Ma.On the other hand,the Diancang Shan,4122m of highest elevation and as the part continuing southward from the Yulong Snow Mountain also experienced a tectonic extension at 5.0~2.5Ma,but differing from the Tiger Leap Gorge had little erosion,which further proves the existence of isostatic rebound in the Yulong Snow Mountain and this rebound also increased the modern high relief between the two mountains.
【Fund】: 国家重点基础研究发展规划项目(批准号:2002CB412601);; 国家自然科学基金项目(批准号:40672151)资助
【CateGory Index】: P534.63;P542.31
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