Structural Characteristics and Evolution of No.9 Strike-Slip Fault Zone in Gaoshiti-Moxi Area in Central Sichuan Basin

被引：1
作者：
Lu G. [1 ]
Tian F. [1 ]
He D. [1 ]
Liu H. [2 ]
Zhao X. [2 ]
机构：
[1] School of Energy Resources, China University of Geosciences, Beijing
[2] Southwest Geophysical Research Institute, BGP, CNPC, Chengdu
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2023年 / 48卷 / 06期
关键词：
Gaoshiti-Moxi area; strike-slip fault; structural characteristics; structural evolution; structural model of fault; tectonics;
D O I：
10.3799/dqkx.2022.505
中图分类号：
学科分类号：
摘要：
Multiple strike-slip faults have been identified in the Gaoshiti-Moxi area in the central Sichuan basin. In order to deepen the understanding of the structural geometry and kinematic characteristics of these strike-slip faults, based on deep drilling and high-precision three-dimensional seismic data in the central Sichuan basin, in this paper it describes in detail the structural geometry of the No.9 strike-slip fault zone in the Gaoshiti-Moxi area, and establishes a three-dimensional structural model of the fault. The formation and evolution process is reconstructed through structural back stripping and inversion. The No.9 strike-slip fault zone is nearly east-west trending, with an extension length of 60 km, showing a dextral transtensional fault. The fault zone develops horsetail structure, linear structure, oblique structure, and overlapping zones on the plane, with obvious segmentation characteristics. Typical strike-slip structural styles such as high-steep linear structure,‘Y’-shaped and anti‘- Y’-shaped structures, flower structures are developed on the section. The different tectonic styles developed in different strata. The fault zone is composed of 7 main faults, and the development scale, inclination and connection mode of each fault slice are different. On the basis of pre-existing basement faults, the No. 9 strike-slip fault zone experienced three stages of deformations: the embryonic development stage in the Late Sinian-Early Caledonian, the main growth stage in the Late Caledonian, and the inherited extension stage of Late Permian. The faults developed different growth patterns in Proterozoic-Lower Paleozoic: (1) the fault gradually grows upward from basement, and the fault throws of the upper and lower strata is consistent or gradually reduced; (2) the fault core is located in the Lower Paleozoic, the fault gradually propagated up and down during the active period, and the fault throw of the Lower Paleozoic strata was larger than that of the underlying strata. © 2023 China University of Geosciences. All rights reserved.
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页码：2238 / 2253
页数：15
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