| 青藏高原的现代构造 |
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| 引用本文： | 鄢家全,时振梁,汪素云,环文林.青藏高原的现代构造[J].地球物理学报,1981,24(4):385-393. |
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| 作者姓名： | 鄢家全 时振梁 汪素云 环文林 |
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| 作者单位： | 国家地震局地球物理研究所 |
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| 摘 要： | 本文以震源机制、地震地质、地壳和上地幔速度结构等资料为基础,研究了与青藏高原成因有关的现代构造问题。主要内容有:1.高原边缘地带以反映压缩形变的逆断层活动为主,内部以一系列大致平行、呈弧形弯曲的左旋走滑断裂活动为主;2.喜马拉雅山以北的广大地域内存在着北北东走向的水平压应力,从六盘山到红河断裂带的主压应力轴走向由北东逐渐变为南东方向;3.高原地壳和上地幔顶部的地震波速度小于印度次大陆和阿拉善地块;4.高原的现代构造同地壳和上地幔顶部的横向不均匀性和印度洋板块的碰撞挤压作用有关。其构造形变过程可以同机器制造业中的《锻模加工》相比拟。
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| 关 键 词： | 现代构造 青藏高原 中源地震 地壳短缩 主压应力轴 红河断裂带 岩石层 断层面解 左旋走滑 上地幔顶部 |
| 收稿时间： | 1980-03-10 |
RECENT TECTONICS IN THE QINGHAI-XIZANG PLATEAU |
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| YAN JIA-QUAN SHI ZHEN-LIANG WANG SU-TUN HUAN WEN-LIN.RECENT TECTONICS IN THE QINGHAI-XIZANG PLATEAU[J].Chinese Journal of Geophysics,1981,24(4):385-393. |
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| Authors: | YAN JIA-QUAN SHI ZHEN-LIANG WANG SU-TUN HUAN WEN-LIN |
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| Institution: | Institute of Geophysics, State Seismological Bureau |
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| Abstract: | Based on the data of focal mechanism solutions, and velocity structure in the crust and upper mantle, we have investigated the recent tectonics with relation to the origin of the plateau. The main results are as follows: （1） The marginal parts of the plateau are dominated by thrust faulting showing compressive deformation, but the inner parts of the plateau are characterized by a series of nearly parallel and arcuated bending left lateral strike slip faults. （2） In the vast region north of the Himalayas, there exists a horizontal compressive stress with NNE direction; from the Liupanshan to Hong He fault zone, the directions of the compressive stress axes vary gradually from NE to SE. （3） The seismic wave velocity in the crust and at the top of the upper mantle in the plateau is slower than that in the Indian subcontinent and Alxa block. （4） The recent tectonics in the plateau is related to the lateral heterogeneities in the crust and at the top of the upper mantle, and is the effects of compression caused by the collision between the Indian and Eurasian plates. The process of tectonic deformation in the plateau can be compared with the "forging die process" used in the machinery industry. |
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