Structure Styles and Their Deformation Mechanisms of Dabashan Foreland Thrust Belt in the North of Sichuan Basin
Structure Styles and Their Deformation Mechanisms of Dabashan Foreland Thrust Belt in the North of Sichuan Basin
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发表时间：
2006
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通讯作者：
C. Ying
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作者：
C. Ying
利用最新地震资料和地面地质资料，对大巴山前陆冲断带的构造样式进行了综合解释，根据其样式的差异，确定了3条构造带：通江—黄金口北西向隐伏冲断带、五宝场—铁山坡西北—北东向交汇带、温泉井—奉节东西向构造带。 样式可分为逆冲断层型、褶皱滑脱断层型、逆冲断褶型3种类型。中生代以来构造变形主要有两个阶段。一期为晚印支期，主要形成北东向褶皱；二期为燕山中晚期至喜马拉雅期，多发育北西向逆冲断层。多期叠置构造变形十分严重。 明显,且受不同方向的联合压应力控制。
By means of the latest seismic data and surface geology,structure styles of Dabashan foreland thrust belt are comprehensively interpreted.According to the difference in their styles,three structure belts can be determined:NW buried thrust belt of Tongjiang-Huangjinkou,NW-NE intersection belt of Wubaochang-Tieshanpo,and EW structure belt of Wenquanjing-Fengjie.Correspondingly,front structure styles can be divided into 3 types: back-thrust fault type,folded detachment fault type,and vis-a-vis thrust faulted fold type.There are two main stages of structure deformations since Mesozoic.The first one is Late Indo-Sinian epoch,mainly forming NE folds;the other is Mid-Late Yanshan to Himalaya,mostly developing NW thrust faults.Multi-stages stacked structure deformations are very obvious,and controlled by combined pressure stress in different directions.