地震地质 ›› 1994, Vol. 16 ›› Issue (4): 404-412.

• 科研简报 • 上一篇    下一篇

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. 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
  • 收稿日期:1994-02-01 修回日期:1994-10-01 出版日期:1994-12-07 发布日期:2009-11-25
  • 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

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

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

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