四川盆地熊坡背斜构造特征及其成因机制  

Structural Features and Genetic Mechanism of Xiongpo Anticline in Sichuan Basin

作　　者：李敬波[1] 李勇[1] 赵国华[1] 颜照坤[1] 周荣军[2] 郑立龙[1] 闫亮[1] 杨聿强 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059 [2]四川省地震局工程地震研究院,四川成都610041

出　　处：《现代地质》2014年第4期761-771,共11页Geoscience

基　　金：国家自然科学基金项目(41372114;41340005;41172162;40972083);国土资源部地质调查工作项目(1212011121268);成都理工大学油气藏地质及开发工程国家重点实验室自主研究项目(SK-0801)

摘　　要：基于地震剖面解释、数字高程模型、历史地震、测年数据及钻孔等资料，分析了四川盆地熊坡背斜的构造特征、运动学特征及其成因机制。结果显示：（1）熊坡背斜与蒲江-新津断裂空间展布上具有较强的一致性，表现出断层传播褶皱模型，变形显著，缩短量为7.2 km，缩短率约为30％；（2）熊坡背斜隆起于（1.0±0.2）MaB.P.之后，且中更新世早期及晚更新世曾发生过强烈活动，使背斜两侧第四系厚度产生明显差异；（3）蒲江-新津断裂现今地震活动明显且小震频繁，曾有Ms＝5.0～5.9的地震历史记录；（4）来自龙门山与扬子克拉通的挤压应力以及断层-滑脱作用是形成熊坡背斜的主要应力机制。熊坡背斜并非均匀应力下连续变形的产物，而是由于断裂活动时发生快速抬升而形成的。Based on seismic section,DEM,historical earthquakes,dating and drilling data,this study ana-lyzed the structural features,kinematics characteristics and genetic mechanism of Xiongpo anticline in Sichuan basin.The results can be drawn as the following aspects：（1 ）the space distribution of Xiongpo anticline is same with that of Pujiang-Xinjin fault zone,presenting a model of fault propagation fold and its shorten is 7.2 km with shorten rate about 30%;（2）Xiongpo anticline uplifted after （1.0 ±0.2）MaB.P.and it was very ac-tive in Early Pleistocene and Late Pleistocene,causing Quaternary-thickness difference between two sides of Xiongpo anticline;（3 ）earthquakes especially small earthquakes happening in Pujiang-Xinjin fault zone oc-curred frequently and there has earthquakes history of Ms ranging from 5.0 to 5.9;（4 ）the faulting-slipping and the crushing stress from Longmenshan to Yangtze craton are the main stress mechanism of Xiongpo anti-cline.It can be concluded that Xiongpo anticline formation is resulted from quickly uplifting when the fault is active rather than the product of uniform stress.

关 键 词：熊坡背斜 断层传播褶皱 成因机制 构造特征 前陆盆地 

分 类 号：P542[天文地球—构造地质学]