Evolution characteristics and genesis of fault-structure in the eastern Andaman Sea depression since the Oligocene

Yan Heng; Luan Xiwu; Li Zhenchun; Ye Chuanhong; Wei Xinyuan; He Huarui

doi:10.12284/hyxb2022067

Volume 44 Issue 9

Aug. 2022

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Yan Heng，Luan Xiwu，Li Zhenchun, et al. Evolution characteristics and genesis of fault-structure in the eastern Andaman Sea depression since the Oligocene[J]. Haiyang Xuebao，2022, 44(9)：87–99 doi: 10.12284/hyxb2022067

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Evolution characteristics and genesis of fault-structure in the eastern Andaman Sea depression since the Oligocene

doi: 10.12284/hyxb2022067

1.
School of Earth Science and Technology, China University of Petroleum (Huadong), Qingdao 266580, China
2.
College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
3.
College of Marine Geosciences, Ocean University of China, Qingdao 266100, China

Received Date: 2021-11-18
Rev Recd Date: 2022-02-09

Available Online: 2022-04-27

Publish Date: 2022-08-29

Abstract

Abstract

We deals with the tectonic evolution of the Andaman Sea, the northeastern margin of the Indian Ocean. Based on large-scale 2D seismic data and drilling data in the eastern Andaman Sea area, combined with regional geological survey and previous research results, eight representative faults were selected and divided into first-order and second-order faults. Growth index method and paleo-fall method were used to quantitatively analyze the faults. The tectonic evolution of the eastern Andaman Sea depression is discussed by calculating the tectonic subsidence of the four main survey lines. The results show that three of the selected growth faults are first-level faults with large span and almost cut through the whole stratum, which are large faults controlling the subsidence of the Andaman Sea area. The other five are secondary faults, controlling the distribution of the tectonic belt and belonging to the boundary of the tectonic belt. During the Oligocene, the Indo-Australian Plate and Eurasian Plate were in the stage of soft collision, with slow fault development, small overhanging and footrow drop, low growth index and tectonic subsidence. During the Miocene, the coupling effect between plates was strengthened, the fault development speed was accelerated, and the thickness of the upper and lower walls was the largest. It was the key period for the formation of multiple fault zones and various fault styles, and the growth index of various layers and the tectonic subsidence reached the peak. Since the Pliocene, the Andaman trench-arc-basin system has gradually stabilized, the fault activity has weakened, the thickness difference between the upper and lower wall of the fault is basically the same, the growth index difference is small, and the tectonic subsidence is basically stable at about 1 km.
- Andaman Sea,
- fault characteristics,
- growth index and drop analysis,
- tectonic subsidence history,
- discussion on fault origin

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References(32)

References

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