Mantle wedge diapirs detected by a dense seismic array in Northern Taiwan

Abstract It is conventionally believed that magma generation beneath the volcanic arc is triggered by the infiltration of fluids or melts derived from the subducted slab. However, recently geochemical analyses argue the arc magma may be formed by mélange diapirs that are physically mixed by sediment...

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Autores principales:	Cheng-Horng Lin, Min-Hung Shih, Ya-Chuan Lai
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e431e17415d84967a86915e01369968e
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spelling	oai:doaj.org-article:e431e17415d84967a86915e01369968e2021-12-02T14:12:47ZMantle wedge diapirs detected by a dense seismic array in Northern Taiwan10.1038/s41598-021-81357-72045-2322https://doaj.org/article/e431e17415d84967a86915e01369968e2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-81357-7https://doaj.org/toc/2045-2322Abstract It is conventionally believed that magma generation beneath the volcanic arc is triggered by the infiltration of fluids or melts derived from the subducted slab. However, recently geochemical analyses argue the arc magma may be formed by mélange diapirs that are physically mixed by sediment, altered oceanic crust, fluids, and mantle above the subducted slab. Further numerical modeling predicts that the mantle wedge diapirs have significant seismic velocity anomalies, even though these have not been observed yet. Here we show that unambiguously later P-waves scattered from some obstacles in the mantle wedge are well recorded at a dense seismic array (Formosa Array) in northern Taiwan. It is the first detection of seismic scattering obstacles in the mantle wedge. Although the exact shape and size of the scattered obstacles are not well constrained by the arrival-times of the later P-waves, the first order approximation of several spheres with radius of ~ 1 km provides a plausible interpretation. Since these obstacles were located just beneath the magma reservoirs around depths between 60 and 95 km, we conclude they may be mantle wedge diapirs that are likely associated with magma generation beneath active volcanoes.Cheng-Horng LinMin-Hung ShihYa-Chuan LaiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Cheng-Horng Lin Min-Hung Shih Ya-Chuan Lai Mantle wedge diapirs detected by a dense seismic array in Northern Taiwan
description	Abstract It is conventionally believed that magma generation beneath the volcanic arc is triggered by the infiltration of fluids or melts derived from the subducted slab. However, recently geochemical analyses argue the arc magma may be formed by mélange diapirs that are physically mixed by sediment, altered oceanic crust, fluids, and mantle above the subducted slab. Further numerical modeling predicts that the mantle wedge diapirs have significant seismic velocity anomalies, even though these have not been observed yet. Here we show that unambiguously later P-waves scattered from some obstacles in the mantle wedge are well recorded at a dense seismic array (Formosa Array) in northern Taiwan. It is the first detection of seismic scattering obstacles in the mantle wedge. Although the exact shape and size of the scattered obstacles are not well constrained by the arrival-times of the later P-waves, the first order approximation of several spheres with radius of ~ 1 km provides a plausible interpretation. Since these obstacles were located just beneath the magma reservoirs around depths between 60 and 95 km, we conclude they may be mantle wedge diapirs that are likely associated with magma generation beneath active volcanoes.
format	article
author	Cheng-Horng Lin Min-Hung Shih Ya-Chuan Lai
author_facet	Cheng-Horng Lin Min-Hung Shih Ya-Chuan Lai
author_sort	Cheng-Horng Lin
title	Mantle wedge diapirs detected by a dense seismic array in Northern Taiwan
title_short	Mantle wedge diapirs detected by a dense seismic array in Northern Taiwan
title_full	Mantle wedge diapirs detected by a dense seismic array in Northern Taiwan
title_fullStr	Mantle wedge diapirs detected by a dense seismic array in Northern Taiwan
title_full_unstemmed	Mantle wedge diapirs detected by a dense seismic array in Northern Taiwan
title_sort	mantle wedge diapirs detected by a dense seismic array in northern taiwan
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/e431e17415d84967a86915e01369968e
work_keys_str_mv	AT chenghornglin mantlewedgediapirsdetectedbyadenseseismicarrayinnortherntaiwan AT minhungshih mantlewedgediapirsdetectedbyadenseseismicarrayinnortherntaiwan AT yachuanlai mantlewedgediapirsdetectedbyadenseseismicarrayinnortherntaiwan
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Mantle wedge diapirs detected by a dense seismic array in Northern Taiwan

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