THE CRUSTAL STRUCTURE AND MODE OF CRUSTAL MOVEMENT IN THE SICHUAN-YUNNAN REGION
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摘要: 根据地球物理异常及大地测深资料探讨川滇交界地区的地壳深部构造背景及地壳结构特征,并综合多方面的研究资料,以两大板块碰撞、青藏高原窿升为构造背景,以川滇菱形断块运动为基本模式,全面系统地揭示川滇交界地区的现代地壳活动性。从地壳运动图象中可以清楚地看到断块差异性活动是现代地壳活动的主要形式。Abstract: Based on geophysical features,MT results and velocity structure of the crust and upper mantle in the Sichuan-Yunnan area,the crustal structure and tectonic setting in the deep crust are here presented. It has become clear that the thick crust of the area bordering the Sichuan and Yunnan provinces,appears to reflect the SSE extrusion in the continent-continent collision between the Indian plate and Eurasian plate. Its recent activity is characte-rized by block faulting.
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Key words:
- Sichuan-Yunnan rhombic block /
- crustal structure /
- block faulting
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