气候变化领域集成服务门户(CCPortal): Slab metamorphism and interface earthquakes in Peru: Implications from three-dimensional hydrothermal variation in the subducted Nazca plate

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DOI	10.1016/j.tecto.2022.229212
	Slab metamorphism and interface earthquakes in Peru: Implications from three-dimensional hydrothermal variation in the subducted Nazca plate
	Zhu, Weiling; Ji, Yingfeng; Qu, Rui; Xie, Chaodi; Zeng, Deng
通讯作者	Ji, YF ; Qu, R (通讯作者)
发表日期	2022
ISSN	0040-1951
EISSN	1879-3266
卷号	823
英文摘要	Convergent plate dehydration is of significance in determining the coupling strength and seismicity activity at variable subduction contacts. Characterized by decadal M > 7.5 devastating earthquakes offshore and a lack of a magmatic arc in north-central Peru, the Peruvian megathrust remains enigmatic in terms of the along-strike heterogeneity of the thermal regime, slab dehydration, and seismotectonics. Hydrothermally controlled petrological metamorphism of multiple facies within the subducted oceanic lithosphere and subsequent fluid channeling and migration lead to fault instability and seismic and aseismic slips on the megathrusts. Based on 3D thermal modeling, we estimate the features of the Peruvian subduction hydrothermal regime. Our results show that (1) the shallow seismogenic zone (M > 7.5 earthquakes) along coastal Peru exhibits high slab dehydration rates and gradients and is associated with fault segmentation and the updip migration of fluids controlling the occurrence of great megathrust earthquakes; (2) the low slab dehydration rate (<0.01 wt%/km) in north Peru contributes to the absent volcanism in north Peru, while the high slab dehydration rate (>0.02 wt%/km) beneath south Peru facilitate the recurrence of magmatic volcanism; (3) the subduction-related slip behaviors at a certain depth resulting from heterogeneous variations in the coupled plate interface are determined by slab dehydration and petrological metamorphism in the subducted Nazca plate. The variation in slab dehydration contributes to the seismotectonic segmentation and slip variation associated with changes in the pore fluid pressure on the subducted megathrust.
关键词	FLUID-FLOW HEAT-FLOW THERMAL REGIME OCEANIC-CRUST SEISMICITY ZONE BENEATH DEHYDRATION MANTLE SLIP
英文关键词	Thermal regime; Slab dehydration; 3D numerical model
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000770876700016
来源期刊	TECTONOPHYSICS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260606
推荐引用方式 GB/T 7714	Zhu, Weiling,Ji, Yingfeng,Qu, Rui,et al. Slab metamorphism and interface earthquakes in Peru: Implications from three-dimensional hydrothermal variation in the subducted Nazca plate[J]. 中国科学院青藏高原研究所,2022,823.
APA	Zhu, Weiling,Ji, Yingfeng,Qu, Rui,Xie, Chaodi,&Zeng, Deng.(2022).Slab metamorphism and interface earthquakes in Peru: Implications from three-dimensional hydrothermal variation in the subducted Nazca plate.TECTONOPHYSICS,823.
MLA	Zhu, Weiling,et al."Slab metamorphism and interface earthquakes in Peru: Implications from three-dimensional hydrothermal variation in the subducted Nazca plate".TECTONOPHYSICS 823(2022).