کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9535712 | 1356895 | 2005 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Tomographic evidence for wholesale underthrusting of India beneath the entire Tibetan plateau
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
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چکیده انگلیسی
We analyzed a global tomographic model for the Tibet-Himalayan collision zone, which indicates that the Indian lithospheric slab has been subducted subhorizontally beneath nearly the entire Tibetan plateau to depths of 165-260Â km. Tibetan velocity structure is low in its crust and high in its lithospheric mantle at depths between 75 and 120Â km. We interpret an asthenospheric layer positioned above the subducted Indian slab at depths between 120 and 165Â km beneath the Tibetan plateau. Beneath the central portion of the plateau a low-velocity anomaly exists from the crust down to 310Â km depth, indicating mantle upwelling through a weakened part of the subducted slab. We present a model, which explains that, the uplift history and low relief of the Tibetan plateau is a result of subhorizontal subduction and heating of Indian lithosphere that is separated from Tibetan lithosphere by a thin channel of asthenosphere. Two predictions made by our model are: (1) the amount of shortening in the Himalayas is equivalent to the amount of underthrusted Indian mantle lithosphere; and (2) a young mantle geochemical signature should be present along the entire southern portion of the Tibetan plateau.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Asian Earth Sciences - Volume 25, Issue 3, June 2005, Pages 445-457
Journal: Journal of Asian Earth Sciences - Volume 25, Issue 3, June 2005, Pages 445-457
نویسندگان
Hua-wei Zhou, Michael A. Murphy,