Thermal and tectonic consequences of India underthrusting Tibet
Thermal and tectonic consequences of India underthrusting Tibet
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DOI：
10.1016/j.epsl.2012.07.010
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发表时间：
2012-11-01
影响因子：
5.3
通讯作者：
Jackson, James
中科院分区：
文献类型：
--
作者：
Craig, Timothy J.;Copley, Alex;Jackson, James
青藏高原是地球上最大的造山系统，对我们了解大陆岩石圈如何变形产生了影响。高原下方是在大陆岩石圈内观察到的一些最深（大约 100 公里）的地震，这些地震在有关大陆流变和行为的持续争论中至关重要。我们对该地区的地震深度进行了新的观测，并使用热模型表明所有这些地震都发生在温度低于或接近 600 摄氏度的物质中。热模型与实验得出的流动定律相结合表明，如果印度下地壳是无水的，它将在整个青藏高原南半部下方保持坚固，正如动态模型所表明的那样。在西藏西北部，强烈的逆冲印度下地壳毗邻刚性的塔里木盆地，可能是塔里木相对于稳定的欧亚大陆顺时针旋转和沿天山缩短梯度的原因。 (C) 2012 Elsevier B.V. 保留所有权利。
The Tibetan Plateau is the largest orogenic system on Earth, and has been influential in our understanding of how the continental lithosphere deforms. Beneath the plateau are some of the deepest (similar to 100 km) earthquakes observed within the continental lithosphere, which have been pivotal in ongoing debates about the rheology and behaviour of the continents. We present new observations of earthquake depths from the region, and use thermal models to suggest that all of them occur in material at temperatures of less than or similar to 600 degrees C. Thermal modelling, combined with experimentally derived flow laws, suggests that if the Indian lower crust is anhydrous it will remain strong beneath the entire southern half of the Tibetan plateau, as is also suggested by dynamic models. In northwest Tibet, the strong underthrust Indian lower crust abuts the rigid Tarim Basin, and may be responsible for both the clockwise rotation of Tarim relative to stable Eurasia and the gradient of shortening along the Tien Shan. (C) 2012 Elsevier B.V. All rights reserved.