| 东昆仑深部结构地震探测研究现状与展望 |
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| 关键词:East Kunlun Mountains deep-seated structure relic subduction research progress |
| 基金项目:中国地质调查局项目“中国大地构造演化;国际亚洲大地构造图编制”(编号: DD20190367);国家自然科学基金项目(编号: 41674099) |
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| Status and Prospect of the Seismic Detection of the Deep-seated Structure beneath the East Kunlun Mountains |
| Located in the northern part of the Tibetan Plateau, the East Kunlun Mountains serve as an important area for studying the tectonics of the northward growth of the Tibetan Plateau. Compressed by the northward subduction of the Indian plate and the southward resistance of the Alashan block in Asia, Cenozoic faults and seismicity are widely developed in this area, thus the East Kunlun Mountains are thought to be an excellent site for studying the uplift of the Tibetan Plateau, the structural deformation, and the mechanism of earthquakes. In recent decades, a large number of geophysical explorations have been carried out in East Kunlun and adjacent areas. A lot of progresses have been achieved, although some discrepancies are still existent among the observations by different approaches. Through collection and compiling of the results from active and passive seismic detections carried out in East Kunlun and adjacent areas in recent years, the authors conducted a comprehensively analysis of the crustal and upper-mantle velocity structure, Moho topography and anisotropy features in the study area. The main conclusions drawn can be summarized as follows: The north-dipping mantle interface beneath the southern Qaidam Moho is likely to represent a relic of the Early-Paleozoic subduction zone of the Kunlun Ocean. The lack of deep crustal root beneath the East Kunlun Mountains indicates that the Moho flexuring in the study area was not dominated by isostatic balance. Affected by the far-field stress of the northward subduction of the Indian plate, the crust of the East Kunlun Mountains was mainly thickened by the compression of the India plate (through Tibetan Plateau) exerted on the Qaidam Basin. Finally, the authors discussed the deficiency in the previous studies of the crust-mantle structure research in the East Kunlun Mountains and put forward the reasoning and the direction for future researches. |
| ZHAO Rong-tao,ZHAO Wen-jin,LIU Zhi-wei,SONG Yang,CHEN Chang-xin.2022.Status and Prospect of the Seismic Detection of the Deep-seated Structure beneath the East Kunlun Mountains[J].Acta Geoscientica Sinica,43(2):189-201. |
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