Metasomatized harzburgite xenoliths from Avacha volcano as fragments of mantle wedge of the Kamchatka arc: Implication for the metasomatic agent
Abstract 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...
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crwiley:10.1046/j.1440-1738.2003.00392.x 2024-06-02T08:09:42+00:00 Metasomatized harzburgite 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. 2003 http://dx.doi.org/10.1046/j.1440-1738.2003.00392.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1440-1738.2003.00392.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1440-1738.2003.00392.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Island Arc volume 12, issue 2, page 233-246 ISSN 1038-4871 1440-1738 journal-article 2003 crwiley https://doi.org/10.1046/j.1440-1738.2003.00392.x 2024-05-03T10:40:05Z Abstract 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 Cr 2 O 3 . 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 Wiley Online Library Avacha ENVELOPE(158.503,158.503,53.040,53.040) The Island Arc 12 2 233 246 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract 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 Cr 2 O 3 . 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. |
spellingShingle |
Arai, Shoji Ishimaru, Satoko Okrugin, Victor M. Metasomatized harzburgite xenoliths from Avacha volcano as fragments of mantle wedge of the Kamchatka arc: Implication for the metasomatic agent |
author_facet |
Arai, Shoji Ishimaru, Satoko Okrugin, Victor M. |
author_sort |
Arai, Shoji |
title |
Metasomatized harzburgite xenoliths from Avacha volcano as fragments of mantle wedge of the Kamchatka arc: Implication for the metasomatic agent |
title_short |
Metasomatized harzburgite xenoliths from Avacha volcano as fragments of mantle wedge of the Kamchatka arc: Implication for the metasomatic agent |
title_full |
Metasomatized harzburgite xenoliths from Avacha volcano as fragments of mantle wedge of the Kamchatka arc: Implication for the metasomatic agent |
title_fullStr |
Metasomatized harzburgite xenoliths from Avacha volcano as fragments of mantle wedge of the Kamchatka arc: Implication for the metasomatic agent |
title_full_unstemmed |
Metasomatized harzburgite xenoliths from Avacha volcano as fragments of mantle wedge of the Kamchatka arc: Implication for the metasomatic agent |
title_sort |
metasomatized harzburgite xenoliths from avacha volcano as fragments of mantle wedge of the kamchatka arc: implication for the metasomatic agent |
publisher |
Wiley |
publishDate |
2003 |
url |
http://dx.doi.org/10.1046/j.1440-1738.2003.00392.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1440-1738.2003.00392.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1440-1738.2003.00392.x |
long_lat |
ENVELOPE(158.503,158.503,53.040,53.040) |
geographic |
Avacha |
geographic_facet |
Avacha |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_source |
Island Arc volume 12, issue 2, page 233-246 ISSN 1038-4871 1440-1738 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1440-1738.2003.00392.x |
container_title |
The Island Arc |
container_volume |
12 |
container_issue |
2 |
container_start_page |
233 |
op_container_end_page |
246 |
_version_ |
1800755466986323968 |