期刊
EARTH AND PLANETARY SCIENCE LETTERS
卷 288, 期 1-2, 页码 329-334出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.epsl.2009.09.036
关键词
Kunlun mountains; Qaidam basin; receiver function imaging; lithospheric structure; crustal thickening; Tibetan plateau
资金
- Ministry of Science and Technology of China [2006DFA21350]
- Chinese Geological Survey [1212010511809]
- U.S. National Science Foundation [0738779]
- Directorate For Geosciences
- Division Of Earth Sciences [0738879] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Earth Sciences [0738779] Funding Source: National Science Foundation
During 2006 to 2007, a small array of broadband seismic stations was deployed across the eastern Qaidam-Kunlun border. Receiver functions derived from this data set show a coherent P-to-S converted phase from the Moho at similar to 65 km to similar to 58 km below sea level (b.s.l.) from south to north beneath the Kunlun mountains. The Moho is observed at similar to 45 km b.s.l. beneath the Qaidam basin. A sharp offset of similar to 15 km in the Moho depth is observed just beneath the Qaidam-Kunlun border. The close correlation between the surface topography and the sharp Moho offset substantiates the view that the Kunlun crust is weaker than that of the Qaidam basin and thickens vertically in response to compression between India (through the Tibetan plateau) and the Qaidam basin. Furthermore, a strong steeply north-dipping converted phase can be seen from similar to 5 to 15 km b.s.l. north of the North Kunlun Fault, which is likely a major south-directed thrust fault partially responsible for the thickening of the Kunlun crust. (C) 2009 Elsevier B.V. All rights reserved.
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