DEFORMATIONAL CHARACTERISTICS, EVOLUTIONARY HISTORY, AND DEFORMATION MECHANISM OF THE MIDDLE LONGMENSHAN THRUST-NAPPES AND RELATED TECTONICS

SEISMOLOGY AND EGOLOGY ›› 1994, Vol. 16 ›› Issue (4): 404-412.

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DEFORMATIONAL CHARACTERISTICS, EVOLUTIONARY HISTORY, AND DEFORMATION MECHANISM OF THE MIDDLE LONGMENSHAN THRUST-NAPPES AND RELATED TECTONICS

Received:1994-02-01 Revised:1994-10-01 Online:1994-12-07 Published:2009-11-25

龙门山中段推覆构造带及相关构造的演化历史和变形机制(一)

陈社发¹, 邓起东², 赵小麟², C. J. L. Wilson P. Dirks³, 罗志立⁴, 刘树根⁴

1. 中国地质大学(武汉), 武汉 430074;
2. 国家地震局地质研究所, 北京 100029;
3. 墨尔本大学, Parkville, Vic. 3052, 澳大利亚;
4. 成都地质学院, 成都 610059

基金资助:
地震科学联合基金资助((91048)并吸收了中澳合作的部分成果

Abstract

Abstract: The middle Longmenshan thrust－nappe belt was developed by SE-directed compression,while the Songpan-Ganzi fold belt was subjected to NE－SW shortening. The Songpan-Ganzi foldbelt underwent four generations of deformation during middle-late stages of late Triassic : NW-trending structures were formed in D1 and deformed into acurate structures by left-lateral shearing in D2; D3 was Characterized by SE-directed thrusting, and granites intruded in D4. the middle Longmenshan thrust-nappe belt consists of Yingxiu-Beichuan, Wenchuan-Maowen, Guanxian-Anxian and Southeastern marginal nappes, and the Yingxiu－Beichuan nappe can be divided into Jiudingshan, Pengguan Complex and Tangwangzhai sub-nappes. Klippen belongs to Pengguan Complex sub-nappe. The thrust-nappe belt was propagated form NW to SE.

Key words: Longmenshan, Thrust-nappe zone, Deformational Characterlstics, Deformation Mechanism

摘要： 从龙门山推覆构造带和松潘-甘孜褶皱带的变形特征及发展过程,论证了龙门山中段推覆构造是由于其北西侧松潘-甘孜褶皱带中的北东～南西向收缩派生的南东向挤压而逐渐发育起来的。推覆作用是晚三叠世晚期以来自北西往南东逐渐扩展的,属前展式(背驮式)。

关键词: 龙门山, 推覆构造带, 变形特征, 变形机制

陈社发, 邓起东, 赵小麟, C. J. L. Wilson P. Dirks, 罗志立, 刘树根. 龙门山中段推覆构造带及相关构造的演化历史和变形机制(一)[J]. 地震地质, 1994, 16(4): 404-412.

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DEFORMATIONAL CHARACTERISTICS, EVOLUTIONARY HISTORY, AND DEFORMATION MECHANISM OF THE MIDDLE LONGMENSHAN THRUST-NAPPES AND RELATED TECTONICS

龙门山中段推覆构造带及相关构造的演化历史和变形机制(一)

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