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首页> 外文期刊>Science in China. Series D, Earth sciences >Shear wave velocity structure of the crust and upper mantle underneath the Tianshan orogenic belt
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Shear wave velocity structure of the crust and upper mantle underneath the Tianshan orogenic belt

机译：天山造山带下地壳和上地幔的剪切波速度结构

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From April, 2003 to September, 2004, a passive broadband seismic array consisting of 60 stations was deployed over the Tianshan orogenic belt by State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration. Among them, 51 stations make up an about 500-km-long profile across the Tianshan Mountains from Kuytun to Kuqa. The receiver function profile and S-wave velocity structure of the crust and upper mantle down to 100 km deep are obtained by using the receiver function method (Liu et al. 1996, 2000). The main results can be summarized as follows: (1) A clear mountain root does not exist beneath the Tianshan Mountains, and the crust-mantle boundaries underneath the stations mostly have transitional structures. This implies that the material differentiation between the crust and mantle is not yet accomplished and the orogenic process is still going on. (2) The crust beneath the Tianshan Mountains has laterally blocked structures in direction perpendicular to the mountain strike, and the crust-mantle boundary has a clear dislocation structure. Both of them correspond to each other. (3) The offsets of the Moho discontinuity are highly correlated to the tectonic borders on the surface and that corresponding to the frontal southern Tianshan fault reaches to 14 km. This manifests that large vertical divergent movement took place between different blocks. This supports the discontinuous model of the Tianshan orogeny, and the Tarim block subduction is restricted only to the southern side of the South Tianshan. (4) Inside the upper and middle crust of the Tianshan Mountains exist several low-velocity bodies correlated with high seismicity located on the mountain-basin jointures on both sides of the mountain and between different blocks, and the low-velocity bodies on the mountain-basin jointures are inclined obviously to the mountain. This implies that the low-velocity bodies may be correlated closely to the thrust and subduction of the basins on both sides of the mountain, the splicing of adjacent blocks and the fast uplift of the Tianshan Mountains.
机译：2003年4月至2004年9月，中国地震局地质研究所地震动力学国家重点实验室在天山造山带上部署了由60个台站组成的无源宽带地震阵列。其中，从奎屯到库车，横跨天山的51个站长约500公里。利用接收器函数方法获得了地壳和上地幔深达100 km的接收器函数剖面和S波速度结构（Liu et al。1996，2000）。主要结果可归纳为：（1）天山下不存在明显的山根，台下的地幔边界大多具有过渡构造。这意味着地壳和地幔之间的物质区分尚未完成，造山过程仍在继续。 （2）天山下的地壳在垂直于山地走向的方向上有侧向封闭的构造，地幔幔边界具有明显的位错结构。他们两个彼此对应。 （3）莫霍面断层的偏移与地表构造边界高度相关，与额南南部天山断裂对应的偏移达到14 km。这表明不同块之间发生了较大的垂直发散运动。这支持了天山造山运动的不连续模型，并且塔里木块俯冲作用仅限于南天山的南侧。 （4）在天山的上，中地壳内部，在山的两侧和不同地块之间的山盆接缝处，存在几个与高地震活动有关的低速体，以及在山体上的低速体盆地接缝明显向山倾斜。这意味着低速体可能与山体两侧盆地的逆冲和俯冲，相邻块体的拼接以及天山的快速隆升密切相关。

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