Seismic evidence for a possible deep crustal hot zone beneath Southwest Washington

Abstract Crustal pathways connecting deep sources of melt and the active volcanoes they supply are poorly understood. Beneath Mounts St. Helens, Adams, and Rainier these pathways connect subduction-induced ascending melts to shallow magma reservoirs. Petrogenetic modeling predicts that when these me...

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Autores principales:	Ashton F. Flinders, Yang Shen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d6b9e892d9174524afbc51e7073fed32
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spelling	oai:doaj.org-article:d6b9e892d9174524afbc51e7073fed322021-12-02T11:40:44ZSeismic evidence for a possible deep crustal hot zone beneath Southwest Washington10.1038/s41598-017-07123-w2045-2322https://doaj.org/article/d6b9e892d9174524afbc51e7073fed322017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-07123-whttps://doaj.org/toc/2045-2322Abstract Crustal pathways connecting deep sources of melt and the active volcanoes they supply are poorly understood. Beneath Mounts St. Helens, Adams, and Rainier these pathways connect subduction-induced ascending melts to shallow magma reservoirs. Petrogenetic modeling predicts that when these melts are emplaced as a succession of sills into the lower crust they generate deep crustal hot zones. While these zones are increasingly recognized as a primary site for silicic differentiation at a range of volcanic settings globally, imaging them remains challenging. Near Mount Rainier, ascending melt has previously been imaged ~28 km northwest of the volcano, while to the south, the volcano lies on the margin of a broad conductive region in the deep crust. Using 3D full-waveform tomography, we reveal an expansive low-velocity zone, which we interpret as a possible hot zone, linking ascending melts and shallow reservoirs. This hot zone may supply evolved magmas to Mounts St. Helens and Adams, and possibly Rainier, and could contain approximately twice the melt volume as the total eruptive products of all three volcanoes combined. Hot zones like this may be the primary reservoirs for arc volcanism, influencing compositional variations and spatial-segmentation along the entire 1100 km-long Cascades Arc.Ashton F. FlindersYang ShenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ashton F. Flinders Yang Shen Seismic evidence for a possible deep crustal hot zone beneath Southwest Washington
description	Abstract Crustal pathways connecting deep sources of melt and the active volcanoes they supply are poorly understood. Beneath Mounts St. Helens, Adams, and Rainier these pathways connect subduction-induced ascending melts to shallow magma reservoirs. Petrogenetic modeling predicts that when these melts are emplaced as a succession of sills into the lower crust they generate deep crustal hot zones. While these zones are increasingly recognized as a primary site for silicic differentiation at a range of volcanic settings globally, imaging them remains challenging. Near Mount Rainier, ascending melt has previously been imaged ~28 km northwest of the volcano, while to the south, the volcano lies on the margin of a broad conductive region in the deep crust. Using 3D full-waveform tomography, we reveal an expansive low-velocity zone, which we interpret as a possible hot zone, linking ascending melts and shallow reservoirs. This hot zone may supply evolved magmas to Mounts St. Helens and Adams, and possibly Rainier, and could contain approximately twice the melt volume as the total eruptive products of all three volcanoes combined. Hot zones like this may be the primary reservoirs for arc volcanism, influencing compositional variations and spatial-segmentation along the entire 1100 km-long Cascades Arc.
format	article
author	Ashton F. Flinders Yang Shen
author_facet	Ashton F. Flinders Yang Shen
author_sort	Ashton F. Flinders
title	Seismic evidence for a possible deep crustal hot zone beneath Southwest Washington
title_short	Seismic evidence for a possible deep crustal hot zone beneath Southwest Washington
title_full	Seismic evidence for a possible deep crustal hot zone beneath Southwest Washington
title_fullStr	Seismic evidence for a possible deep crustal hot zone beneath Southwest Washington
title_full_unstemmed	Seismic evidence for a possible deep crustal hot zone beneath Southwest Washington
title_sort	seismic evidence for a possible deep crustal hot zone beneath southwest washington
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/d6b9e892d9174524afbc51e7073fed32
work_keys_str_mv	AT ashtonfflinders seismicevidenceforapossibledeepcrustalhotzonebeneathsouthwestwashington AT yangshen seismicevidenceforapossibledeepcrustalhotzonebeneathsouthwestwashington
_version_	1718395611274805248

Seismic evidence for a possible deep crustal hot zone beneath Southwest Washington

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