A limited role for metasomatized subarc mantle in the generation of boron isotope signatures of arc volcanic rocks
Metasomatized subarc mantle is often regarded as one of the mantle reservoirs enriched in fluid-mobile elements (FMEs; e.g., B, Li, Cs, As, Sb, Ba, Rb, Pb), which, when subject to wet melting, will contribute to the characteristic FME-rich signature of arc volcanic rocks. Evidence of wet melts in th...
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2019
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ftsubgoettingen:oai:publications.goettingen-research-online.de:2/76851 2023-09-05T13:20:46+02:00 A limited role for metasomatized subarc mantle in the generation of boron isotope signatures of arc volcanic rocks Tomanikova, Lubomira Savov, Ivan P. Harvey, Jason de Hoog, Jan C.M. Churikova, Tatiana G. Yogodzinski, Gene M. Gordeychik, Boris N. 2019 https://resolver.sub.uni-goettingen.de/purl?gro-2/76851 https://resolver.sub.uni-goettingen.de/purl?gs-1/16295 https://doi.org/10.1130/G46092.1 en eng 0091-7613 https://resolver.sub.uni-goettingen.de/purl?gro-2/76851 doi:10.1130/G46092.1 https://resolver.sub.uni-goettingen.de/purl?gs-1/16295 Goescholar https://goescholar.uni-goettingen.de/licenses journal_article yes published_version 2019 ftsubgoettingen https://doi.org/10.1130/G46092.1 2023-08-20T22:15:04Z Metasomatized subarc mantle is often regarded as one of the mantle reservoirs enriched in fluid-mobile elements (FMEs; e.g., B, Li, Cs, As, Sb, Ba, Rb, Pb), which, when subject to wet melting, will contribute to the characteristic FME-rich signature of arc volcanic rocks. Evidence of wet melts in the subarc mantle wedge is recorded in metasomatic amphibole-, phlogopite-, and pyroxene-bearing veins in ultramafic xenoliths recovered from arc volcanoes. Our new B and δ11B study of such veins in mantle xenoliths from Avachinsky and Shiveluch volcanoes, Kamchatka arc, indicates that slab-derived FMEs, including B and its characteristically high δ11B, are delivered directly to a melt that experiences limited interaction with the surrounding mantle before eruption. The exceptionally low B contents (from 0.2 to 3.1 μg g–1) and low δ11B (from –16.6‰ to +0.9‰) of mantle xenolith vein minerals are, instead, products of fluids and melts released from the isotopically light subducted and dehydrated altered oceanic crust and, to a lesser extent, from isotopically heavy serpentinite. Therefore, melting of amphibole- and phlogopite-bearing veins in a metasomatized mantle wedge cannot alone produce the characteristic FME geochemistry of arc volcanic rocks, which require a comparatively large, isotopically heavy and B-rich serpentinite-derived fluid component in their source Article in Journal/Newspaper Kamchatka Georg-August-Universität Göttingen: GoeScholar Geology 47 6 517 521 |
institution |
Open Polar |
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Georg-August-Universität Göttingen: GoeScholar |
op_collection_id |
ftsubgoettingen |
language |
English |
description |
Metasomatized subarc mantle is often regarded as one of the mantle reservoirs enriched in fluid-mobile elements (FMEs; e.g., B, Li, Cs, As, Sb, Ba, Rb, Pb), which, when subject to wet melting, will contribute to the characteristic FME-rich signature of arc volcanic rocks. Evidence of wet melts in the subarc mantle wedge is recorded in metasomatic amphibole-, phlogopite-, and pyroxene-bearing veins in ultramafic xenoliths recovered from arc volcanoes. Our new B and δ11B study of such veins in mantle xenoliths from Avachinsky and Shiveluch volcanoes, Kamchatka arc, indicates that slab-derived FMEs, including B and its characteristically high δ11B, are delivered directly to a melt that experiences limited interaction with the surrounding mantle before eruption. The exceptionally low B contents (from 0.2 to 3.1 μg g–1) and low δ11B (from –16.6‰ to +0.9‰) of mantle xenolith vein minerals are, instead, products of fluids and melts released from the isotopically light subducted and dehydrated altered oceanic crust and, to a lesser extent, from isotopically heavy serpentinite. Therefore, melting of amphibole- and phlogopite-bearing veins in a metasomatized mantle wedge cannot alone produce the characteristic FME geochemistry of arc volcanic rocks, which require a comparatively large, isotopically heavy and B-rich serpentinite-derived fluid component in their source |
format |
Article in Journal/Newspaper |
author |
Tomanikova, Lubomira Savov, Ivan P. Harvey, Jason de Hoog, Jan C.M. Churikova, Tatiana G. Yogodzinski, Gene M. Gordeychik, Boris N. |
spellingShingle |
Tomanikova, Lubomira Savov, Ivan P. Harvey, Jason de Hoog, Jan C.M. Churikova, Tatiana G. Yogodzinski, Gene M. Gordeychik, Boris N. A limited role for metasomatized subarc mantle in the generation of boron isotope signatures of arc volcanic rocks |
author_facet |
Tomanikova, Lubomira Savov, Ivan P. Harvey, Jason de Hoog, Jan C.M. Churikova, Tatiana G. Yogodzinski, Gene M. Gordeychik, Boris N. |
author_sort |
Tomanikova, Lubomira |
title |
A limited role for metasomatized subarc mantle in the generation of boron isotope signatures of arc volcanic rocks |
title_short |
A limited role for metasomatized subarc mantle in the generation of boron isotope signatures of arc volcanic rocks |
title_full |
A limited role for metasomatized subarc mantle in the generation of boron isotope signatures of arc volcanic rocks |
title_fullStr |
A limited role for metasomatized subarc mantle in the generation of boron isotope signatures of arc volcanic rocks |
title_full_unstemmed |
A limited role for metasomatized subarc mantle in the generation of boron isotope signatures of arc volcanic rocks |
title_sort |
limited role for metasomatized subarc mantle in the generation of boron isotope signatures of arc volcanic rocks |
publishDate |
2019 |
url |
https://resolver.sub.uni-goettingen.de/purl?gro-2/76851 https://resolver.sub.uni-goettingen.de/purl?gs-1/16295 https://doi.org/10.1130/G46092.1 |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_relation |
0091-7613 https://resolver.sub.uni-goettingen.de/purl?gro-2/76851 doi:10.1130/G46092.1 https://resolver.sub.uni-goettingen.de/purl?gs-1/16295 |
op_rights |
Goescholar https://goescholar.uni-goettingen.de/licenses |
op_doi |
https://doi.org/10.1130/G46092.1 |
container_title |
Geology |
container_volume |
47 |
container_issue |
6 |
container_start_page |
517 |
op_container_end_page |
521 |
_version_ |
1776201399892180992 |