川西北天井山构造变形特征与物理模拟  

Structural and deforming characteristics and related physical simulation of Tianjingshan in Northwest Sichuan,China

作　　者：李卿[1] 李忠权[1] 

机构地区：[1]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059

出　　处：《成都理工大学学报（自然科学版）》2012年第6期665-670,共6页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金重点项目(41030426);四川省青年科技基金资助项目(03ZQ026-046;05JY029-088-2)

摘　　要：天井山构造位于龙门山冲断前锋带,浅层表现为一系列断片组成的后翼突破构造,中部以前展式发育的叠瓦状构造和断弯褶皱为主,地腹则发育叠瓦式构造和双重构造。经物理模拟检验了:①天井山构造印支期主要发育薄皮构造,由此可见该地区印支期动力学机制不是以挤压为主,而是受南北向挤压应力与北西-南东向重力滑覆共同作用。②喜马拉雅期天井山构造在北西-南东向挤压应力作用下变形序列为以前展式为主。③天井山构造存在多个滑脱层系,滑脱层上下形成分层变形、垂向叠置的不协调收缩构造变形。The Tianjingshan structure is located in the front edge of the Longmen Mountains tectonic zone. Its shallower section shows the breakthrough structures in the rear wing formed by a series of the fragments. Imbricated structures and broken curved drapes are mainly developed in the central section. Imbricate structures and duplex structure are mainly developed in the profound section. The physical simulation detects that the thin-skinned structures mainly formed in Indonesia period. This means that the structural dynamics in this period was not compression but a common effect of the S-N compression stress and the NW-SE gravitational sliding. The deforming sequence of the Tianiingshan structure was mainly the progression in Himalayan period, under S-N compression stress showing obvious advanced structures. There are detachment structures in this zone and the layering deformational and vertically superposed discordant contraction deformations form above and below the sliding formations.

关 键 词：龙门山北段 天井山 构造变形 物理模拟 

分 类 号：P554[天文地球—构造地质学]