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Velocity structure of the crust and uppermost mantle in the boundary area of the Tianshan Mountains and the Tarim Basin
作者姓名:MINing  WANGLiangshu  LIHua  XUMingjie  CHENYunping  LICheng  ZHANGYong  YUDayong
作者单位:[1]DepartmentofEarthSciences,NanjingUniversity,Nanjing210093,China [2]SeismologicalBureauofXinjiangUygurAutonomousRegion,Urumqi830011,China
摘    要:A portable 3-component broadband digital seismic array was deployed across the Tianshan orogenic belt (TOB) to investigate the lithospheric structure. Based on receiver function analysis of the teleseismic P-wave data, a 2-D S-wave velocity profile of the boundary area of the TOB and the Tarim Basin was obtained at the depths of 0--80 km.Our results reveal a vertical and lateral inhomogeneity in the crust and uppermost mantle. Four velocity interfaces divide the crystalline crust into the upper, middle and lower crust. A low velocity zone is widely observed in the upper-middle crust. The depth of Moho varies between 42 and 52 km. At the north end of the profile the Moho dips northward with a vertical offset of 4--6 km, which implies a subduction front of the Tarim Basin into the TOB. The Moho generally appears as a velocity transitional zone except beneath two stations in the northern Tarim Basin, where the Moho is characterized by a typical velocity discontinuity. The fine velocity structure and the deep contact deformation of the crust and upper most mantle delineate the north-south lithospheric shortening and thickening in the boundary area of the TOB and the Tarim Basin, which would be helpful to constructing the geodynamical model of the intracontinental mountain-basin-coupling system.

关 键 词:天山山脉  塔里木盆地  岩石层  造山带  地质学
收稿时间:26 September 2004

Velocity structure of the crust and uppermost mantle in the boundary area of the Tianshan Mountains and the Tarim Basin
MINing WANGLiangshu LIHua XUMingjie CHENYunping LICheng ZHANGYong YUDayong.Velocity structure of the crust and uppermost mantle in the boundary area of the Tianshan Mountains and the Tarim Basin[J].Chinese Science Bulletin,2005,50(3):270-275.
Authors:Ning Mi  Liangshu Wang  Hua Li  Mingjie Xu  Yunping Chen  Cheng Li  Yong Zhang  Dayong Yu
Institution:(1) Department of Earth Sciences, Nanjing University, 210093 Nanjing, China;(2) Seismological Bureau of Xinjiang Uygur Autonomous Region, 830011 Urumqi, China
Abstract:A portable 3-component broadband digital seismic array was deployed across the Tianshan orogenic belt (TOB) to investigate the lithospheric structure. Based on receiver function analysis of the teleseismic P-wave data, a 2-D S-wave velocity profile of the boundary area of the TOB and the Tarim Basin was obtained at the depths of 0–80 km. Our results reveal a vertical and lateral inhomogeneity in the crust and uppermost mantle. Four velocity interfaces divide the crystalline crust into the upper, middle and lower crust. A low velocity zone is widely observed in the upper-middle crust. The depth of Moho varies between 42 and 52 km. At the north end of the profile the Moho dips northward with a vertical offset of 4–6 km, which implies a subduction front of the Tarim Basin into the TOB. The Moho generally appears as a velocity transitional zone except beneath two stations in the northern Tarim Basin, where the Moho is characterized by a typical velocity discontinuity. The fine velocity structure and the deep contact deformation of the crust and upper most mantle delineate the north-south lithospheric shortening and thickening in the boundary area of the TOB and the Tarim Basin, which would be helpful to constructing the geodynamical model of the intracontinental mountain-basin-coupling system.
Keywords:Tianshan orogenic belt  receiver function  low velocity zone  mountain-basin-coupling system  
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