| 印度-欧亚碰撞与洋-陆碰撞的差异 |
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| 引用本文： | 曾融生,吴庆举,丁志峰,朱露培.印度-欧亚碰撞与洋-陆碰撞的差异[J].地震学报,2007,29(1):1-10. |
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| 作者姓名： | 曾融生 吴庆举 丁志峰 朱露培 |
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| 作者单位： | 1)北京100081中国地震局地球物理研究所2)Department of Earth and Atmospheric Science, Saint Louis University, Missouri 63103, USA |
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| 基金项目： | 国家自然科学基金，中国地震局项目 |
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| 摘 要： | 观测的证据充分表明，印度——欧亚的缝合带雅鲁藏布江上存在自南向北的地壳俯冲带，它穿过莫霍面，深度大约达到100 km. 喜马拉雅中可能存在多重的地壳俯冲. 它们有别于海洋碰撞时所产生的整个岩石圈俯冲. 作者观测到雅鲁藏布江以北上地幔的板片构造，它可以解释为印度向欧亚俯冲时上地幔岩石圈的痕迹. 它们说明与洋——陆的俯冲不同，印度向欧亚俯冲时，地壳与上地幔岩石圈出现拆层现象. 综合现有的地壳上地幔构造，显示在不同地质年代中，印度与欧亚之间产生自南向北以及自北向南相反方向的俯冲，而且俯冲带周围出现某些速度异常区.
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| 关 键 词： | 印度—欧亚碰撞 洋—陆碰撞 拆层 |
| 文章编号： | 0253-3782(2007)01-0001-10 |
| 修稿时间： | 2006年2月22日 |
INDIA-EURASIAN COLLISION VS OCEAN CONTINENT COLLISION |
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| Zeng Rongsheng,Wu Qingju,Ding Zhifeng,Zhu Lupei.INDIA-EURASIAN COLLISION VS OCEAN CONTINENT COLLISION[J].Acta Seismologica Sinica,2007,29(1):1-10. |
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| Authors: | Zeng Rongsheng Wu Qingju Ding Zhifeng Zhu Lupei |
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| Abstract: | Ample observational evidence shows that there is a northward crustal subduction zone underneath the Yarlung Zangbo suture between India and Eurasia. It penetrates Moho to a depth of about 100 km. There are probably multiple such crustal subductions under the Himalayas. They are different from lithosphere subduction during oceanic collisions. The detected slAbs in the upper mantle north of the Yarlung Zangbo suture can be interpreted as remains of the Indian plate's mantle lithosphere. In contrary to ocean-continental subduction, the mantle lithosphere is delaminated from the crust as the Indian plate subducts underneath Eurasia. Existing structural images of the crust and upper mantle of the Tibetan Plateau reveal that there were both northward and southward subductions over different geological periods, causing some seismic velocity anomalies around those subduction zones. |
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| Keywords: | India-Eurasian collision ocean-continental collision delamination |
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