STUDY ON CONTINENTAL DEFORMATION FEATURES IN SICHUAN-YUNNAN REGION FROM AEROMAGNETIC AND GRAVITY DATA
Received date: 2004-11-02
Revised date: 2005-04-07
Online published: 2005-10-25
Based on aeromagnetic and gravity data, continental deformation features in Sichuan-Yunnan Region(SYR) have been studied. We get the characteristics of basement and its lateral heterogeneity beneath SYR from aeromagnetic data. The eastward viscosity lower crustal flow of Tibet was blocked by the rigid basement near Kangding-Mianyang area, and turn to SE-SSE direction. Most strong earthquakes occurred on the large areomagnetic variation belts. The lateral heterogeneity of basement, which inferred by large areomagnetic variation, vailed stress concentration, earthquakes preparation and occurrence. We also get distribution of crustal thickness and continental deformation features in SYR from gravity data. On the background of collision between India plate and Eurasia plate and uplifting of Tibet, the viscosity lower crustal flow induced crust thicken extensively, and driven upper middleup crust break into some big and small sub-blocks. The continental deformation features in SYR, including remotion of rigid sub-block through the movement of huge slip faults and extensive crustal thickening, are not fit “Crustal thickening” mode or “Continental extrusion” mode.
Key words： Aeromagnetic; Gravity; Basement; Earthquake; Continental deformation.
WANG Liang-shu , ZHONG Kai , XU Zhen , DING Zeng-yong , XU Ming-jie . STUDY ON CONTINENTAL DEFORMATION FEATURES IN SICHUAN-YUNNAN REGION FROM AEROMAGNETIC AND GRAVITY DATA[J]. Advances in Earth Science, 2005 , 20(10) : 1089 -1094 . DOI: 10.11867/j.issn.1001-8166.2005.10.1089
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