渝东大焦石坝地区差异构造变形

doi:10.11743/ogg20190513

Abstract

Abstract: The structural deformation characteristics of different layers,zones and stages at the Dajiaoshiba area were analyzed based on seismic and regional geological data.Thereafter,we summarized the differential deformation patterns of the north and south sections,and discussed the mechanism for the formation of the S-N oriented Wujiang and Daershan structural fault deformation zones.The results show that four sets of structural deformation layers occur vertically in the Dajiaoshiba area,while horizontally it can be divided into thrust-fold belt,thrust-decollement fold belt and decollement-fold belt from east to west,which have undergone SE-NW-trending,nearly WE-trending and NE-SW-trending compressive stress since the Yanshan Movement.The studied area represents the front belt of the thrust nappe structure,and the major decollement formation shifts from the Precambrian to the Cambrian,which has gone through the piggy-back progressive deformation from east to west.Due to the segmentation of the Qiyueshan fault and the structural difference of the Precambrian basement decollement fault,the composition of east to west deformation zones changes along the trend of the nearly SN-trending Daershan and Wujiang structures,with a deformation pattern of thrusting-compresso-shearing-fault-detaching-decollement in the northern section,thrusting-compresso-shearing-fault-propagation-decollement in the middle section and thrusting-fault-bending-fault-propagation-decollement in the southern section,respectively.

Key words: piggy-back progressive deformation, differential structural deformation, fold belt, Dajiaoshiba area

CLC Number:

TE121.2

Tuo Xiusong, Chen Kongquan, Luo Shunshe, Tang Jiguang, Zhang Shuishan, Liu Qijun. Differential structural deformation of the Dajiaoshiba area,East Chongqing[J]. Oil & Gas Geology, 2019, 40(5): 1074-1083.

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Differential structural deformation of the Dajiaoshiba area,East Chongqing

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