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Seismic evidence for a possible deep crustal hot zone beneath Southwest Washington
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 e...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5547095/ https://www.ncbi.nlm.nih.gov/pubmed/28785107 http://dx.doi.org/10.1038/s41598-017-07123-w |
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author | Flinders, Ashton F. Shen, Yang |
author_facet | Flinders, Ashton F. Shen, Yang |
author_sort | Flinders, Ashton F. |
collection | PubMed |
description | 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 | Online Article Text |
id | pubmed-5547095 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-55470952017-08-09 Seismic evidence for a possible deep crustal hot zone beneath Southwest Washington Flinders, Ashton F. Shen, Yang Sci Rep Article 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. Nature Publishing Group UK 2017-08-07 /pmc/articles/PMC5547095/ /pubmed/28785107 http://dx.doi.org/10.1038/s41598-017-07123-w Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Flinders, Ashton F. Shen, Yang Seismic evidence for a possible deep crustal hot zone beneath Southwest Washington |
title | 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_short | 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 |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5547095/ https://www.ncbi.nlm.nih.gov/pubmed/28785107 http://dx.doi.org/10.1038/s41598-017-07123-w |
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