Characteristics of fault-tectonic evolution and its controlling factors in the South Kunsong area

He Huarui; Luan Xiwu; Wei Xinyuan; Qiao Jianghao

doi:10.12284/hyxb2022143

Volume 44 Issue 12

Jan. 2023

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He Huarui，Luan Xiwu，Wei Xinyuan, et al. Characteristics of fault-tectonic evolution and its controlling factors in the South Kunsong area[J]. Haiyang Xuebao，2022, 44(12)：95–108 doi: 10.12284/hyxb2022143

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Characteristics of fault-tectonic evolution and its controlling factors in the South Kunsong area

doi: 10.12284/hyxb2022143

1.
School of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
2.
College of Marine Geosciences, Ocean University of China, Qingdao 266100, China

Received Date: 2022-03-23
Rev Recd Date: 2022-07-24

Available Online: 2022-08-09

Publish Date: 2023-01-17

Abstract

Abstract

The South Kunsong area is a negative tectonic unit in the western part of the Wan’an Basin, in which the N−S trending faults run through the north and the south. The unique tectonic characteristics make it a window for studying the tectonic evolution and regional fault strike-slip activities in the western part of the Wan’an Basin. The sedimentary strata in the study area are divided into three sets of structural layers, the structure-sedimentary filling section in the South Kunsong area is drawn by the back stripping method, and the tectonic subsidence and tectonic subsidence rate in the South Kunsong area are calculated. Settlement process and controlling factors. The research results show that the fault combination styles in the lower and middle structural layers are mainly core-type faults, "Y"-type faults, stepped faults and high-angle flower-shaped structures. W−E trending and NE−SW trending; the upper tectonic layer is not developed with faults and is stable deposition; under the control of regional strike-slip faults and the South China Sea spreading movement, the tectonic evolution of the South Kunsong area has experienced four stages since the Eocene: the initial stage. During the rifting period, extensional fault-deflection period, strike-slip reformation period and thermal subsidence period, the stratigraphic structure properties of the Cenozoic also showed a three-stage transformation of extension and strike-slip, control of strike-slip faults, and thermal subsidence.
- Wan’an Basin, South China Sea,
- South Kunsong area,
- strike-slip fault,
- tectonic evolution,
- tectonic layer

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References

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