Impact of convergence rate and slab dip angle on island-arc magma generation

Yongliang BAI; Wenzhao ZHANG; Shiguo WU; Dongdong DONG; Xuan MU; Jiahao TIAN; Yuanpeng LIU

doi:10.1007/s00343-025-4222-1

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Impact of convergence rate and slab dip angle on island-arc magma generation

Geology | Updated：2025-10-16

- Impact of convergence rate and slab dip angle on island-arc magma generation
- Journal of Oceanology and Limnology Vol. 43, Issue 5, Pages: 1425-1440(2025)
- Affiliations：
  
  1.College of Oceanography and Space Informatics, China University of Petroleum, Qingdao 266580, China
  2.Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, China
  3.Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
  4.Haikou Marine Geological Survey Center, China Geological Survey, Haikou 570100, China
- Author bio：
  
  yongliang.bai1986@gmail.com
- Funds：
- DOI：10.1007/s00343-025-4222-1
  CLC：
- Received：16 August 2024，
  
  Accepted：24 October 2024，
  
  Online First：11 November 2024，
  
  Published：01 September 2025
- Accepted：
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BAI Yongliang,ZHANG Wenzhao,WU Shiguo,et al.Impact of convergence rate and slab dip angle on island-arc magma generation[J].Journal of Oceanology and Limnology,2025,43(05):1425-1440.
DOI：

BAI Yongliang,ZHANG Wenzhao,WU Shiguo,et al.Impact of convergence rate and slab dip angle on island-arc magma generation[J].Journal of Oceanology and Limnology,2025,43(05):1425-1440. DOI： 10.1007/s00343-025-4222-1.

摘要

Abstract

Island-arc magmatism is a crucial process in the Earth’s crustal growth. However

how the island-arc magma production rate (MPR) changes and the key influencing factors remains unclear. This study employs numerical models to simulate island-arc growth

incorporating slab dehydration

mantle hydration and melting

and melt extraction. In addition

the impacts of convergence rate and slab dip angle on island-arc magma production were studied. Results suggest that

(1) MPR increases with higher convergence rates; high convergence rates enhance slab water transport efficiency and mantle wedge convection

thereby promoting water fraction and temperature in potential molten regions; (2) MPR initially rises and then falls as the slab dip angle varies from 30° to 45°

and to 60°. This variation is closely tied to water content in the wedge rather than mantle temperature. However

a higher slab dip promotes dehydration towards the potential-melting mantle wedge

which causes water to ascend to shallow areas and reduces the area of the potential molten region. Ultimately

a dip angle of 45° is optimal for retaining the most suitable water fraction and mantle wedge area

thereby maintaining the largest MPR; (3) convergence rate variation has a much larger influence on magma production rate than dip angle variation. When the convergence rate varies from 2 to 10 cm/a

the largest time-averaged MPR is 64.0 times the smallest one

whereas when the slab dip varies from 30° to 60°

the largest time-averaged MPR is only 3.5 times the smallest one. These findings align with numerous instances observed in modern-day subduction zones.

关键词

Keywords

references

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