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《Chinese Journal of Geophysics》 1999-03
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CRUST AND UPPER MANTLE TOMOGRAPHIC STRUCTURE ACROSS THE ALTYN FAULT ZONE USING TELESEISMIC P-WAVES

SHI DA-NMN; JIANG MEI; MA KAI-YI; XUE GUANG-QI;DONG YING-JUN;G.POUPINET; g WITTLINGER; G. HERQUEL1) Institute of Mineral Deposits, CAGS Beijing 100037, China2) LGIT-IRIGM Universite Joseph Forier Fourier Grenoble 38041 France3) Ecole et Observatoire des science de la Terse, 67084 Strasbourg, France  
The Altyn fault is the major fault on the north-westrn border of theQinghai-Xizang Plateau. The results given by a teleseismic p-wave tomography stUdyreveal the Altyn fault a 40kin wide low velocity stripe which extends quite verticallydown to a depth of about 150tri. The results also show that the Altyn fault cutsthrough a Tarim-like lithosphere which already plunged down to the Qaidam basin,which may imply that the Tarim lithosphere once subducted beneath the Qaidambefore Altyn fault came intO existonce. The tesults suggest that the hot uPPer mantlematorial may have involved in maintaining the high surface elevation besides thesimple gravity compensation in the central-northern Qinghai-Xizang plateau.
【Fund】: 地质矿产部前沿科研项目!9501106
【CateGory Index】: P542.3
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