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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(二)
引用本文:陈社发,邓起东.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(二)[J].地震地质,1994,16(4):413-421.
作者姓名:陈社发  邓起东
作者单位:中国地质大学,国家地震局地质研究所,成都地质学院
摘    要:川西前陆盆地是从晚三叠世晚期(须家河期)以来开始发育的,其形成是龙门山推覆构造带自北西往南东持续推覆的结果。本区的构造发展经历了伸展裂陷、构造反转和持续推覆3个主要阶段。构造变形的力源主要来自松潘-甘孜褶皱带的北东~南西向收缩派生的南东向挤压

关 键 词:龙门山  推覆构造带  前陆盆地  构造演化  构造变形机制

DEFORMATIONAL CHARACTERISTICS,EVOLUTIONARY HISTORY, AND DEFORMATION MECHANISM OF THE MIDDLE LONGMENSHAN THRUST-NAPPES AND RELATED TECTONICS
Abstract:(Ⅰ) 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 shear-ing in D2 ; D3 was Characterized by SE-directed thrusting , and granites intruded in D4. the mid-dle Longmenshan thrust-nappe belt consists of Yingxiu-Beichuan, Wenchuan-Maowen, Guanxi-an-Anxian and Southeastern marginal nappes, and the Yingxiu-Beichuan nappe can be dividedinto Jiudingshan, Pengguan Complex and Tangwangzhai sub-nappes. Klippen belongs to Peng-guan Complex sub-nappe. The thrust-nappe belt was propagated form NW to SE
Keywords:Longmenshan  Thrust-nappe zone  Deformational Characterlstics  Defor-mation Mechanism Abstract (Ⅱ) The western Sichuan foreland basin initiated in T by continuous compression of the Long-menshan thrust-nappe belt  and its depositional centers were gr
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