Metasomatized hazburgite xenoliths from Avacha volcano as fragments of mantle wedge of the Kamchatka arc: Implication for the metasomatic agent
金沢大学理工研究域自然システム学系 Abundant peridotite xenoliths have been found in pyroclasitics of Avacha (Avachinsky) volcano, the south Kamchatka arc, Russia. They are mostly refractory harzburgite with or without clinopyroxene: the Fo of olivine and Cr/(Cr+Al) atomic ratio of spinel range from 91 to 92 and from...
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Blackwell Publishing
2003
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ftkanazawauninii:oai:kanazawa-u.repo.nii.ac.jp:00010751 2023-09-05T13:20:44+02:00 Metasomatized hazburgite xenoliths from Avacha volcano as fragments of mantle wedge of the Kamchatka arc: Implication for the metasomatic agent Arai Shoji Ishimaru Satoko Okrugin Victor M 荒井 章司 石丸 聡子 2003-06-01 http://hdl.handle.net/2297/19547 https://kanazawa-u.repo.nii.ac.jp/?action=repository_uri&item_id=10751 https://kanazawa-u.repo.nii.ac.jp/?action=repository_action_common_download&item_id=10751&item_no=1&attribute_id=26&file_no=1 en eng Blackwell Publishing 10.1046/j.1440-1738.2003.00392.x https://kanazawa-u.repo.nii.ac.jp/?action=repository_uri&item_id=10751 http://hdl.handle.net/2297/19547 Island Arc, 12(2), 233-246(2003-06-01) 1038-4871 AA10848628 https://kanazawa-u.repo.nii.ac.jp/?action=repository_action_common_download&item_id=10751&item_no=1&attribute_id=26&file_no=1 Harzburgite Kamchatka arc Mantle wedge Metasomatism Orthopyroxene Silica enrichment Slab-derived fluid Journal Article 2003 ftkanazawauninii 2023-08-17T05:52:26Z 金沢大学理工研究域自然システム学系 Abundant peridotite xenoliths have been found in pyroclasitics of Avacha (Avachinsky) volcano, the south Kamchatka arc, Russia. They are mostly refractory harzburgite with or without clinopyroxene: the Fo of olivine and Cr/(Cr+Al) atomic ratio of spinel range from 91 to 92 and from 0.5 to 0.7, respectively. They are metasomatized to various extents, and the metasomatic orthopyroxene has been formed at the expense of olivine. The metasomatic orthopyroxene, free of deformation and exsolution, is characterized by low contents of CaO and Cr2O3. The complicated way of replacement possibly indicates low viscosity of the metasomatic agent, namely hydrous fluids released from the relatively cool slab beneath the south Kamchatka arc. This is a good contrast to the north Kamchatka arc, where the slab has been hot enough to provide slab-derived melts. High content of total orthopyroxene, 40 vol% on average, in metasomatized harzburgite from Avacha suggests silica enrichment of the mantle wedge, and is equivalent to some subcratonic harzburgite. Some subcratonic harzburgites therefore could have been formed by transportation of subarc metasomatized peridotites to a deeper part of the upper mantle. Article in Journal/Newspaper Kamchatka Kanazawa University Repository for Academic Resources (KURA) Avacha ENVELOPE(158.503,158.503,53.040,53.040) |
institution |
Open Polar |
collection |
Kanazawa University Repository for Academic Resources (KURA) |
op_collection_id |
ftkanazawauninii |
language |
English |
topic |
Harzburgite Kamchatka arc Mantle wedge Metasomatism Orthopyroxene Silica enrichment Slab-derived fluid |
spellingShingle |
Harzburgite Kamchatka arc Mantle wedge Metasomatism Orthopyroxene Silica enrichment Slab-derived fluid Arai Shoji Ishimaru Satoko Okrugin Victor M 荒井 章司 石丸 聡子 Metasomatized hazburgite xenoliths from Avacha volcano as fragments of mantle wedge of the Kamchatka arc: Implication for the metasomatic agent |
topic_facet |
Harzburgite Kamchatka arc Mantle wedge Metasomatism Orthopyroxene Silica enrichment Slab-derived fluid |
description |
金沢大学理工研究域自然システム学系 Abundant peridotite xenoliths have been found in pyroclasitics of Avacha (Avachinsky) volcano, the south Kamchatka arc, Russia. They are mostly refractory harzburgite with or without clinopyroxene: the Fo of olivine and Cr/(Cr+Al) atomic ratio of spinel range from 91 to 92 and from 0.5 to 0.7, respectively. They are metasomatized to various extents, and the metasomatic orthopyroxene has been formed at the expense of olivine. The metasomatic orthopyroxene, free of deformation and exsolution, is characterized by low contents of CaO and Cr2O3. The complicated way of replacement possibly indicates low viscosity of the metasomatic agent, namely hydrous fluids released from the relatively cool slab beneath the south Kamchatka arc. This is a good contrast to the north Kamchatka arc, where the slab has been hot enough to provide slab-derived melts. High content of total orthopyroxene, 40 vol% on average, in metasomatized harzburgite from Avacha suggests silica enrichment of the mantle wedge, and is equivalent to some subcratonic harzburgite. Some subcratonic harzburgites therefore could have been formed by transportation of subarc metasomatized peridotites to a deeper part of the upper mantle. |
format |
Article in Journal/Newspaper |
author |
Arai Shoji Ishimaru Satoko Okrugin Victor M 荒井 章司 石丸 聡子 |
author_facet |
Arai Shoji Ishimaru Satoko Okrugin Victor M 荒井 章司 石丸 聡子 |
author_sort |
Arai Shoji |
title |
Metasomatized hazburgite xenoliths from Avacha volcano as fragments of mantle wedge of the Kamchatka arc: Implication for the metasomatic agent |
title_short |
Metasomatized hazburgite xenoliths from Avacha volcano as fragments of mantle wedge of the Kamchatka arc: Implication for the metasomatic agent |
title_full |
Metasomatized hazburgite xenoliths from Avacha volcano as fragments of mantle wedge of the Kamchatka arc: Implication for the metasomatic agent |
title_fullStr |
Metasomatized hazburgite xenoliths from Avacha volcano as fragments of mantle wedge of the Kamchatka arc: Implication for the metasomatic agent |
title_full_unstemmed |
Metasomatized hazburgite xenoliths from Avacha volcano as fragments of mantle wedge of the Kamchatka arc: Implication for the metasomatic agent |
title_sort |
metasomatized hazburgite xenoliths from avacha volcano as fragments of mantle wedge of the kamchatka arc: implication for the metasomatic agent |
publisher |
Blackwell Publishing |
publishDate |
2003 |
url |
http://hdl.handle.net/2297/19547 https://kanazawa-u.repo.nii.ac.jp/?action=repository_uri&item_id=10751 https://kanazawa-u.repo.nii.ac.jp/?action=repository_action_common_download&item_id=10751&item_no=1&attribute_id=26&file_no=1 |
long_lat |
ENVELOPE(158.503,158.503,53.040,53.040) |
geographic |
Avacha |
geographic_facet |
Avacha |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_relation |
10.1046/j.1440-1738.2003.00392.x https://kanazawa-u.repo.nii.ac.jp/?action=repository_uri&item_id=10751 http://hdl.handle.net/2297/19547 Island Arc, 12(2), 233-246(2003-06-01) 1038-4871 AA10848628 https://kanazawa-u.repo.nii.ac.jp/?action=repository_action_common_download&item_id=10751&item_no=1&attribute_id=26&file_no=1 |
_version_ |
1776201375397445632 |