Underplating in the Himalaya-Tibet Collision Zone Revealed by the Hi-CLIMB Experiment
Underplating in the Himalaya-Tibet Collision Zone Revealed by the Hi-CLIMB Experiment
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DOI：
10.1126/science.1167719
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发表时间：
2009-09-11
期刊：
影响因子：
56.9
通讯作者：
Huang, Bor-Shouh
中科院分区：
文献类型：
--
作者：
Nabelek, John;Hetenyi, Gyoergy;Huang, Bor-Shouh
通过对喜马拉雅山脉和青藏高原岩石圈结构的研究，探讨了它们的形成过程。利用一个800米长的密集排列的地震台阵，我们建立了喜马拉雅山脉和青藏高原南部地壳和上地幔的图像。这张图片以连续的方式揭示了喜马拉雅主逆冲断层，它从尼泊尔下方的浅层延伸到西藏南部的中地壳。印度地壳可以追溯到北纬31度。西藏地壳-地幔界面具有各向异性，反映了其形成过程中的剪切作用。倾斜的地幔组构表明，印度地幔正以扩散的方式沿着几个演化的近平行构造俯冲。
We studied the formation of the Himalayan mountain range and the Tibetan Plateau by investigating their lithospheric structure. Using an 800-kilometer-long, densely spaced seismic array, we have constructed an image of the crust and upper mantle beneath the Himalayas and the southern Tibetan Plateau. The image reveals in a continuous fashion the Main Himalayan thrust fault as it extends from a shallow depth under Nepal to the mid-crust under southern Tibet. Indian crust can be traced to 31 degrees N. The crust/mantle interface beneath Tibet is anisotropic, indicating shearing during its formation. The dipping mantle fabric suggests that the Indian mantle is subducting in a diffuse fashion along several evolving subparallel structures.