Two structural types of shear fracture belts related to wrenches

CHEN Shuping; TIAN Zuoji; XU Shidong; MA Zhongzhen; CHANG Shaoying; ZHAO Huaibo

doi:10.12097/gbc.2023.04.005

2024 Vol. 43, No. 1

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CHEN Shuping, TIAN Zuoji, XU Shidong, MA Zhongzhen, CHANG Shaoying, ZHAO Huaibo. 2024. Two structural types of shear fracture belts related to wrenches. Geological Bulletin of China, 43(1): 13-19. doi: 10.12097/gbc.2023.04.005

Citation:

CHEN Shuping, TIAN Zuoji, XU Shidong, MA Zhongzhen, CHANG Shaoying, ZHAO Huaibo. 2024. Two structural types of shear fracture belts related to wrenches. Geological Bulletin of China, 43(1): 13-19. doi: 10.12097/gbc.2023.04.005

Two structural types of shear fracture belts related to wrenches

1.
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China
2.
College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China
3.
Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
4.
Hangzhou Research Institute of Geology, PetroChina, Hangzhou 310023, Zhejiang, China

Received Date: 04 April 2023

Revised Date: 29 May 2023

Publish Date: 15 January 2024

Abstract

Abstract

Riedel shears are the typical structural styles in strike-slip belts. However, shear fracture zones have been found recently to have different shear fracture assemblages. In these shear fracture belts, the properties of the arraying patterns of the shear fractures are identical with those of the moving ways of the two fault blocks, which is either left-step with left-lateral movement or right-step with right-lateral movement. The shear fractures are called homo-step-slip ones. These oversteps between two shear faults are divergent. Based on the Coulomb fracture theory, it is suggested that the shear fracture belts would be formed in the fault blocks between two wrench belts. In these cases, two conjugate potential shear faults would be formed along the maximum principal stress trajectories. In the progressive deformation, the shears with smaller acute angle to the maximum shear stress (principal strike-slip) trajectories have priority to develop. The shears with bigger acute angle to the maximum shear stress trajectories would be delimited between the former shears. A new-type shear fracture belt is formed different from the typical Riedel shears in shear fracture assemblages. This shear fracture belt will be favorable for both hydrocarbon accumulation and mineral deposit formation due to the divergent oversteps.
- strike-slip belt /
- shear fracture /
- Riedel shear /
- homo-step-slip /
- anti-step-slip /
- double wrench /
- Coulomb fracture

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References

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