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Origin of magmas in subduction zones: a review of experimental studies
Studies of the origin of magmas in subduction zones, particularly in the Japanese island arc, have been significantly advanced by petrological, geochemical, geophysical and experimental studies during last 50 years. Kuno’s original model(1)) for magma generation in the Japanese island arc, that thol...
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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The Japan Academy
2007
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3756732/ https://www.ncbi.nlm.nih.gov/pubmed/24019580 |
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author | Kushiro, Ikuo |
author_facet | Kushiro, Ikuo |
author_sort | Kushiro, Ikuo |
collection | PubMed |
description | Studies of the origin of magmas in subduction zones, particularly in the Japanese island arc, have been significantly advanced by petrological, geochemical, geophysical and experimental studies during last 50 years. Kuno’s original model(1)) for magma generation in the Japanese island arc, that tholeiite magmas are formed at relatively shallow levels in the mantle on the Pacific Ocean side whereas alkali basalt magmas are formed in deeper levels on the Japan Sea side, stimulated subsequent studies, particularly high-pressure experimental studies in which the author participated. Recent seismic tomographic studies of regions beneath the Japanese island arc demonstrate that seismic low-velocity zones where primary magmas are formed have finger-like shapes and rise obliquely from the Japan Sea side toward the Pacific Ocean side. Based on experimental studies, it is suggested that the compositions of primary magmas depend mainly on the H(2)O content and degree of melting in the melting zones, and that primary tholeiite magmas are formed by 10–25% melting of the source mantle containing less than 0.2 wt.% H(2)O. High-alumina basalt and alkali basalt magmas are formed by smaller degrees of melting of similar mantle, whereas primary boninite magmas are formed by more than 20% melting of the source mantle with more than 0.2 wt.% H(2)O, and finally, high-magnesia andesite magmas are formed by smaller degrees of melting of similar mantle. |
format | Online Article Text |
id | pubmed-3756732 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2007 |
publisher | The Japan Academy |
record_format | MEDLINE/PubMed |
spelling | pubmed-37567322013-09-09 Origin of magmas in subduction zones: a review of experimental studies Kushiro, Ikuo Proc Jpn Acad Ser B Phys Biol Sci Review Studies of the origin of magmas in subduction zones, particularly in the Japanese island arc, have been significantly advanced by petrological, geochemical, geophysical and experimental studies during last 50 years. Kuno’s original model(1)) for magma generation in the Japanese island arc, that tholeiite magmas are formed at relatively shallow levels in the mantle on the Pacific Ocean side whereas alkali basalt magmas are formed in deeper levels on the Japan Sea side, stimulated subsequent studies, particularly high-pressure experimental studies in which the author participated. Recent seismic tomographic studies of regions beneath the Japanese island arc demonstrate that seismic low-velocity zones where primary magmas are formed have finger-like shapes and rise obliquely from the Japan Sea side toward the Pacific Ocean side. Based on experimental studies, it is suggested that the compositions of primary magmas depend mainly on the H(2)O content and degree of melting in the melting zones, and that primary tholeiite magmas are formed by 10–25% melting of the source mantle containing less than 0.2 wt.% H(2)O. High-alumina basalt and alkali basalt magmas are formed by smaller degrees of melting of similar mantle, whereas primary boninite magmas are formed by more than 20% melting of the source mantle with more than 0.2 wt.% H(2)O, and finally, high-magnesia andesite magmas are formed by smaller degrees of melting of similar mantle. The Japan Academy 2007-02 /pmc/articles/PMC3756732/ /pubmed/24019580 Text en © 2007 The Japan Academy This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Review Kushiro, Ikuo Origin of magmas in subduction zones: a review of experimental studies |
title | Origin of magmas in subduction zones: a review of experimental studies |
title_full | Origin of magmas in subduction zones: a review of experimental studies |
title_fullStr | Origin of magmas in subduction zones: a review of experimental studies |
title_full_unstemmed | Origin of magmas in subduction zones: a review of experimental studies |
title_short | Origin of magmas in subduction zones: a review of experimental studies |
title_sort | origin of magmas in subduction zones: a review of experimental studies |
topic | Review |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3756732/ https://www.ncbi.nlm.nih.gov/pubmed/24019580 |
work_keys_str_mv | AT kushiroikuo originofmagmasinsubductionzonesareviewofexperimentalstudies |