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Ribeiro, Julia M.1; Gerya, Taras2
Inferring the Paleo-Location of Proto-Arc Magmas During Subduction Infancy in the Izu-Bonin-Mariana
刊名GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
2024-04-01
卷号25期号:4页码:13
DOI10.1029/2023GC011153
语种英语
WOS研究方向Geochemistry & Geophysics
摘要Subduction zones are one of the principal drivers of the modern-day plate tectonics, but the processes that develop as incipient subduction zones mature are yet to be understood. Finding modern analogs for different stages of subduction infancy remains an outstanding challenge to answer questions on how and when an oceanic subduction zone reaches a quasi-steady state to become long-lived. Here, we compare the southern Mariana intra-oceanic arc, in which near-trench spreading and infant arc magmatism developed similar to 3-4 Myr ago, with the Izu-Bonin-Mariana (IBM) proto-arc magmas that formed during subduction infancy similar to 52 Myr ago. Building upon this comparison, we propose that the Southern Mariana may be considered as a modern analog to subduction infancy. The similarities between the Southern Mariana arc magmas and the IBM Eocene proto-arc magmas suggest that the IBM proto-arc crust might have formed within 80-90 km from the paleo-trench (slab at < 90 km paleo-depth), while the Eocene infant arc was likely located at similar to 100 km from the paleo-trench (similar to 100-125 km slab paleo-depth). We use our constraints further to propose a new conceptual model of subduction evolution for IBM. In this model, development of the subduction channel during arc infancy facilitated downward slab penetration and intensified corner flow in the sub-arc asthenosphere of the mantle wedge. As such, cooling and serpentinization of the fore-arc mantle might be considered as the principal drivers of subduction maturation and stabilization over the IBM lifetime.
关键词Izu-Bonin-Mariana southern Mariana fore-arc rifts subduction infancy near-trench spreading subduction evolution magma generation depth paleo-trench slab paleo-depth
WOS记录号WOS:001196453400001
收录类别SCI
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被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.gig.ac.cn/handle/344008/77155
专题中国科学院广州地球化学研究所
通讯作者Ribeiro, Julia M.
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou, Peoples R China
2.Swiss Fed Inst Technol, Inst Geophys, Dept Earth Sci, Zurich, Switzerland
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Ribeiro, Julia M.,Gerya, Taras. Inferring the Paleo-Location of Proto-Arc Magmas During Subduction Infancy in the Izu-Bonin-Mariana[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2024,25(4):13.
APA Ribeiro, Julia M.,&Gerya, Taras.(2024).Inferring the Paleo-Location of Proto-Arc Magmas During Subduction Infancy in the Izu-Bonin-Mariana.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,25(4),13.
MLA Ribeiro, Julia M.,et al."Inferring the Paleo-Location of Proto-Arc Magmas During Subduction Infancy in the Izu-Bonin-Mariana".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 25.4(2024):13.
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