四川盆地中部高石梯-磨溪地区F<sub>I</sub>9走滑断裂带构造特征与演化

鲁国; 田方磊; 何登发; 刘欢; 赵小辉

doi:10.3799/dqkx.2022.505

Volume 48 Issue 6

Jun. 2023

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Article Navigation > Earth Science > 2023 > 48(6): 2238-2253

Lu Guo, Tian Fanglei, He Dengfa, Liu Huan, Zhao Xiaohui, 2023. Structural Characteristics and Evolution of No.9 Strike-Slip Fault Zone in Gaoshiti-Moxi Area in Central Sichuan Basin. Earth Science, 48(6): 2238-2253. doi: 10.3799/dqkx.2022.505

Citation:

Lu Guo, Tian Fanglei, He Dengfa, Liu Huan, Zhao Xiaohui, 2023. Structural Characteristics and Evolution of No.9 Strike-Slip Fault Zone in Gaoshiti-Moxi Area in Central Sichuan Basin. Earth Science, 48(6): 2238-2253. doi: 10.3799/dqkx.2022.505

Citation:

Lu Guo, Tian Fanglei, He Dengfa, Liu Huan, Zhao Xiaohui, 2023. Structural Characteristics and Evolution of No.9 Strike-Slip Fault Zone in Gaoshiti-Moxi Area in Central Sichuan Basin. Earth Science, 48(6): 2238-2253. doi: 10.3799/dqkx.2022.505

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

doi: 10.3799/dqkx.2022.505

Lu Guo^{1
,
,},
Tian Fanglei¹,
He Dengfa^{1
,
,},
Liu Huan²,
Zhao Xiaohui²

1.
School of Energy Resources, China University of Geosciences, Beijing 100083, China
2.
Southwest Geophysical Research Institute, BGP, CNPC, Chengdu 610213, China

Received Date: 2022-08-31
Publish Date: 2023-06-25

Abstract

Abstract

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.
- Gaoshiti-Moxi area,
- strike-slip fault,
- structural characteristics,
- structural model of fault,
- structural evolution,
- tectonics

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

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