Subduction without volcanic arc magma: Insights from two young subduction zones in the western Pacific

被引:3
作者
Dong, Miao [1 ,2 ]
Hao, Tianyao [1 ,2 ]
Xu, Longqing [1 ,2 ]
Zhang, Jiangyang [3 ,4 ]
Zhang, Jian [2 ]
Lu, Chuanchuan [5 ]
He, Qingyu [1 ,2 ]
机构
[1] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resource Res, Beijing 100029, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Chinese Acad Sci, Innovat Acad South China Sea Ecol & Environm Engn, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China
[4] Southern Marine Sci & Engn Guangdong Lab Guangzhou, Guangzhou 511458, Peoples R China
[5] Univ Cambridge, Dept Earth Sci, Bullard Labs, Cambridge CB3 0EZ, England
关键词
Young subduction zone; Arc magma gap; Slab dehydration; Slab bending stress; Thermal structure; PLATE TECTONIC EVOLUTION; MANTLE SERPENTINIZATION; OCEANIC PLATE; SULAWESI; THICKNESS; FLEXURE; MIOCENE; SEAWARD; CRUST; SEA;
D O I
10.1016/j.tecto.2024.230231
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Missing volcanic arcs in young subduction zones are commonly attributed to an insufficient subduction depth of the downgoing slab. The North Sulawesi subduction zone (NSS) in the western Pacific is deeper than the average volcanic sub -arc depth; however, no corresponding volcanoes or magmas are along this arc. To investigate this apparent contradiction, we conducted a comparative analysis of the NSS with the middle section of the Philippine subduction zone (MPS) examining the plate flexure, slab dehydration, and mantle wedge thermal structure. Based on our results, the subducting plates of the NSS exhibit a shallow maximum depth of the yield zone, indicating a lower water content. Additionally, the dehydration depth in the NSS system is shallower compared to MPS. The wedge temperature corresponding to this dehydration depth is exceptionally low, which restricts the production of a significant amount of arc magma. Therefore, we propose that the absence of arc magma in the NSS could be explained by the little water influx and the shallow water dehydration of the subducting slab. Our findings also suggest that, when the angle between a young slab and the overriding plate is small, a long arc magma history will not be observed during early subduction stage.
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页数:12
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