The model for the subduction and collision of the Indian plate with the Eurasian plate and its implications for the tectonic evolution of the Qinghai-Xizang Plateau
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摘要: 青藏高原南部与北部的断裂带走滑方向不同,断裂带在高原东、西两侧的展布规律和构造运动方式也存在极大的差异。通过高原南缘横向地球物理特征的对比,发现该地区东、西两侧深部岩石圈结构存在明显不同,表明印度次大陆向欧亚大陆俯冲碰撞的方式和强度在横向上差异明显。在充分利用高原地质研究最新成果的基础上,提出印度次大陆向欧亚大陆碰撞前地壳增厚及斜向碰撞是造成上述地质现象的根本原因,并由此对青藏高原构造演化的一些特点作了新的解释和探讨。Abstract: The geological and geophysical studies show that there are large discrepancies for the distribution,strike-slip direction and tectonic styles of the faults in the southern and northern parts of the Qinghai-Xizang Plateau,and for the deep crustal architectures in the eastern and western parts of the southern Plateau.These comparative studies indicate that the horizontal differences become apparent in the styles and strength of the subduction and collision between the Indian continent and Eurasian continent.In the light of new findings in geological studies and recent development in lithospheric delamination theory and numerical modeling experiments,we have come to the conclusion that the above-mentioned differences are caused by the crustal thickening and oblique collision prior to the hitting of the Indian continent toward the Eurasian continent.
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Keywords:
- Indian plate /
- Eurasian plate /
- plate collision /
- Qinghai-Xizang Plateau
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