Crustal thickness variations of the Izu-Bonin-Mariana Arc and their implications for arc magmatism

BAI Yongliang; YANG Huiliang; ZHANG Diya; RONG Yilin; DONG Dongdong; WU Shiguo

doi:10.16562/j.cnki.0256-1492.2020073001

2021 Vol. 41, No. 1

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Article navigation > Marine Geology & Quaternary Geology > 2021 > 41(1): 158-165

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BAI Yongliang, YANG Huiliang, ZHANG Diya, RONG Yilin, DONG Dongdong, WU Shiguo. Crustal thickness variations of the Izu-Bonin-Mariana Arc and their implications for arc magmatism[J]. Marine Geology & Quaternary Geology, 2021, 41(1): 158-165. doi: 10.16562/j.cnki.0256-1492.2020073001

Citation:

BAI Yongliang, YANG Huiliang, ZHANG Diya, RONG Yilin, DONG Dongdong, WU Shiguo. Crustal thickness variations of the Izu-Bonin-Mariana Arc and their implications for arc magmatism[J]. Marine Geology & Quaternary Geology, 2021, 41(1): 158-165. doi: 10.16562/j.cnki.0256-1492.2020073001

Crustal thickness variations of the Izu-Bonin-Mariana Arc and their implications for arc magmatism

1.
College of Oceanography and Space Informatics, China University of Petroleum, Qingdao 266580, China
2.
Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, China
3.
Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
4.
Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China

More Information

Corresponding author: YANG Huiliang, dqyhuiliang@163.com

Received Date: 30 July 2020

Revised Date: 13 September 2020

Publish Date: 28 February 2021

Abstract

Abstract

Numerical simulations suggest that plateau/ridge subduction and back-arc spreading would influence magmatism and island-arc crustal growth subduction-zone. In this paper, we take the Izu-Bonin-Mariana (IBM) subduction zone paper as a case to test the above observation. Moho depth variations are estimated based on Inversed gravity anomaly by satellite altimetry and density modelling for different layers, and the trend of the Moho inversion result can well match the seismic interpretations. Crustal thickness variations are mapped based on gravity-inversed Moho, open-source topography and bathymetry as well as sediment thickness. The island-arc crustal volume variations along strike indicate that (1) the subduction of the Ogasawara Plateau and the Dutton Ridge necked and thickened the arc crust, and they also increased the arc crust volume, (2) the opening of the Marian Trough reduced substantially the island-arc crustal growth.
- Izu-Bonin-Mariana Arc /
- gravity inversion /
- crustal thickness /
- back-arc spreading /
- submarine plateau/ridge subduction

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References

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