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Tectonic sequence framework and sedimentary basin evolution of upper triassic in the sichuan basin, China

机译：四川盆地上三叠统构造序列框架与沉积盆地演化

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The Late Triassic is an important geologic age for the evolution of the Sichuan Basin. Based on data from field outcrops, drilling, and seismic acquisition, a detailed study on the sequence boundaries, division, and characteristics of the Upper Triassic in the Sichuan Basin was conducted using tectonic sequence stratigraphy to establish a sequence stratigraphic framework. The research indicates that four sequence boundaries were distinguishable in the Upper Triassic: 1) regionally structural unconformity between the Upper Triassic and Middle and Lower Triassic; 2) the boundary between the second member of the Xujiahe Formation and the Xiaotangzi Formation; 3) the secondary structural unconformity between the third and fourth members of the Xujiahe Formation; and 4) regionally structural unconformity between the Triassic and Jurassic. Based on the occurrence of sequence boundaries, three tectonic sequences could be divided in the study area, each of which was bound by the maximum flooding surface and subdivided into basin extension (BE) and basin wither (BW) system tracts. The evolution of the Western Sichuan Foreland Basin was the main evolution in the Late Triassic, in which TS1 represents the evolution stage of the marginal foreland basin, TS2 represents the formation of the Western Sichuan Foreland Basin with the advent of the Longmen Mountain thrusting and napping body, and TS3 represents the development of the Western Sichuan Foreland Basin. In TS3, the Longmen Mountain was thrust and folded to form the mountain, which was affected by the An County Movement, such that the entire Sichuan Basin transferred into a continental depositional environment. This provided a large amount of carbonate fragments for western Sichuan Basin and became the principal provenance in this area. Tectonic movement is a major controlling factor of the Sichuan Basin evolution in the Late Triassic.
机译：三叠纪晚期是四川盆地演化的重要地质时代。基于野外露头，钻探和地震采集的数据，利用构造层序地层学对四川盆地上三叠统层序边界，划分和特征进行了详细研究，建立了层序地层学框架。研究表明，在上三叠纪中可以区分出四个层序边界：1）上三叠纪与中，下三叠纪之间的区域结构不整合; 2）徐家河组第二段与小塘子组之间的边界; 3）徐家河组第三，四段次生构造不整合; 4）三叠纪和侏罗纪之间的区域性结构不整合。根据层序边界的出现，在研究区域内可以划分出三个构造层序，每个构造层序都由最大洪水面界定，并分为盆地扩展（BE）和盆地枯萎（BW）系统域。川西前陆盆地的演化是三叠纪晚期的主要演化，其中TS1代表边缘前陆盆地的演化阶段，TS2代表川西前陆盆地的形成，随着龙门山的逆冲和小睡的到来。 TS3代表了川西前陆盆地的发展。在TS3中，龙门山被冲断并折叠形成山，受安县运动的影响，整个四川盆地转移到了大陆沉积环境中。这为四川盆地西部提供了大量的碳酸盐碎片，成为该地区的主要物源。构造运动是晚三叠世四川盆地演化的主要控制因素。

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