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首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Lithospheric structure and dynamic processes of the Tianshan orogenic belt and the Junggar basin
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Lithospheric structure and dynamic processes of the Tianshan orogenic belt and the Junggar basin

机译：天山造山带和准gar尔盆地的岩石圈结构和动力学过程

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摘要

Located at the center of the Eurasian continent and accommodating as much as 44% of the present crustal shortening between India and Siberia, the Tianshan orogenic belt (TOB) is one of the youngest (<20 Ma) and highest (elevation>7000 m) orogenic belts in the world. It provides a natural laboratory for examining the processes of intracontinental deformation. In recent years, wide angle seismic reflection/refraction profiling and magnetotelluric sounding surveys have been carried out along a geoscience transect which extends northeastward from Xayar at the northern margin of the Tarim basin (TB), through the Tianshan orogenic belt and the Junggar basin (JB), to Burjing at the southern piedmont of the Allay Mountain. We have also obtained the 2D density structure of the crust and upper mantle of this area by using the Bouguer anomaly data of Northwestern Xinjiang. With these surveys, we attempt to image the 2D velocity and the 2D electric structure of the crust and upper mantle beneath the Tianshan orogenic belt and the Junggar basin. In order to obtain the small-scale structure of the crust-mantle transitional zone of the study area, the wavelet transform method is applied to the seismic wide angle reflection/refraction data. Combining our survey results with heat flow and other geological data, we propose a model that interprets the deep processes beneath the Tianshan orogenic belt and the Junggar basin. Located between the Tarim basin and the Junggar basin, the Tianshan orogenic belt is a block with relatively low velocity, low density, and partially high resistivity. It is tectonically a shortening zone under lateral compression. A detachment exists in the upper crust at the northern margin of the Tarim basin. Its lower part of the upper crust intruded into the lower part of the upper and the middle crust of the Tianshan, near the Korla fau its middle crust intruded into the lower crust of the Tianshan; and its lower crust and lithospheric mantle subducted into the upper mantle of the Tianshan. In these processes, the mass of the lower crust of the Tarim basin was carried down to the upper mantle beneath the Tianshan, forming a similar to 20-km-thick complex crust-mantle transitional zone composed of seven thin layers with a lower than average velocity. The thrusting and folding of the sedimentary cover, the intrusive layer in the upper and middle crust, and the mass added by the subduction of the Tarim basin into the upper mantle of the Tianshan are probably responsible for the crustal thickening of the Tianshan. Due to the important mass deficiency in the crust and the upper mantle of the Tianshan, buoyancy must occur and lead to rapid ascent of the Tianshan. The episodic tectonic uplift of the Tianshan and tectonic subsidence of the Junggar basin are closely related to the evolution of the Paleozoic, Mesozoic, and Cenozoic Tethys. (C) 2003 Elsevier B.V. All rights reserved. [References: 31]
机译：天山造山带位于欧亚大陆的中部，可容纳印度和西伯利亚之间目前地壳缩短的44％，是最年轻的（<20 Ma）和最高的（海拔> 7000 m）之一世界造山带。它提供了一个自然的实验室来检查洲际变形的过程。近年来，已经沿着地学断面进行了广角地震反射/折射剖面和大地电磁测深，该断面从塔里木盆地北缘的Xayar向东北延伸，穿过天山造山带和准gar尔盆地JB），到达阿拉伊山南麓的Burjing。我们还利用西北新疆的布格异常数据获得了该地区地壳和上地幔的二维密度结构。通过这些调查，我们试图对天山造山带和准gar尔盆地下的地壳和上地幔的二维速度和二维电结构成像。为了获得研究区地幔过渡带的小尺度结构，将小波变换方法应用于地震广角反射/折射数据。将我们的调查结果与热流和其他地质数据相结合，我们提出了一个模型，该模型解释了天山造山带和准basin尔盆地下的深部过程。天山造山带位于塔里木盆地和准gar尔盆地之间，是一块速度相对较低，密度较低且电阻率部分较高的块体。从技术上讲，它是横向压缩下的缩短区域。塔里木盆地北缘的上地壳中存在一个脱离。上地壳的下部侵入库尔拉断裂附近的天山上地壳和中地壳的下部。中地壳侵入天山下地壳。其下地壳和岩石圈地幔俯冲到天山的上地幔中。在这些过程中，塔里木盆地下地壳的质量被带到天山下的上地幔，形成了一个类似于20公里厚的复杂地壳-地幔过渡带，该过渡带由七个薄层组成，比平均水平要低。速度。天山地壳的增厚可能是沉积盖的冲断和褶皱，上，中地壳的侵入层以及塔里木盆地俯冲作用增加到天山上地幔中所引起的。由于天山地壳和上地幔中大量的质量不足，必须发生浮力并导致天山快速上升。天山的偶发构造隆升和准gar尔盆地的构造沉降与古生代，中生代和新生代特提斯的演化密切相关。 （C）2003 Elsevier B.V.保留所有权利。 [参考：31]

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