Garnet-Pyroxenite-Derived End-Member Magma Type in Kamchatka: Evidence from Composition of Olivine and Olivine-Hosted Melt Inclusions in Holocene Rocks of Kekuknaisky Volcano
Late Quaternary volcanoes of Sredinny Range (Kamchatka) attract geoscientists' attention by their unusual geochemical features and geodynamic setting. They produced volcanic rocks that are enriched relative to N-MORB in most of incompatible trace elements (except HREE), including strong enrichm...
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ftunivgeneve:oai:unige.ch:aou:unige:112555 2023-10-01T03:57:05+02:00 Garnet-Pyroxenite-Derived End-Member Magma Type in Kamchatka: Evidence from Composition of Olivine and Olivine-Hosted Melt Inclusions in Holocene Rocks of Kekuknaisky Volcano Nekrylov, N. A. Popov, Daniil Plechov, P. Yu. Shcherbakov, V. D. Danyushevsky, L. V. Dirksen, O. V. 2018 https://archive-ouverte.unige.ch/unige:112555 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1134/S0869591118040057 https://archive-ouverte.unige.ch/unige:112555 unige:112555 info:eu-repo/semantics/restrictedAccess ISSN: 0869-5911 Petrology, vol. 26, no. 4 (2018) p. 329-350 info:eu-repo/classification/ddc/550 info:eu-repo/semantics/article Text Article scientifique info:eu-repo/semantics/publishedVersion 2018 ftunivgeneve https://doi.org/10.1134/S0869591118040057 2023-09-07T07:48:26Z Late Quaternary volcanoes of Sredinny Range (Kamchatka) attract geoscientists' attention by their unusual geochemical features and geodynamic setting. They produced volcanic rocks that are enriched relative to N-MORB in most of incompatible trace elements (except HREE), including strong enrichment in large-ion lithophile elements, and show a negative Nb–Ta anomaly, which is typical for rocks formed in supra-subduction settings. However, modern subduction of the Pacific Plate does not reach the most part of Sredinny Range, as inferred by mapping of Wadati–Benioff zone or seismic tomography. We constrain the source of parental magmas for Sredinny Range volcanic rocks by combining major and trace element geochemical data for olivine and naturally quenched olivine-hosed melt inclusions for Holocene tephra layers of the Kekuknaisky field. Composition of the most magnesian olivine (Ni > 2000 ppm, Fe/Mn ≈ 75 at Mg# ~ 84–85 mol %) and geochemical characteristics of the most primitive melts (FC3MS = 0.61 ± 0.04 (2s)) are consistent with their derivation from a pyroxenite source, while elevated LREE/HREE ratios in lavas indicate that it contained garnet. This garnet-bearing pyroxenite likely originated from the lower crust or lithospheric mantle. Its melting could have occurred due to delamination and sinking into the hotter mantle. Article in Journal/Newspaper Kamchatka Université de Genève: Archive ouverte UNIGE Pacific Petrology 26 4 329 350 |
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Université de Genève: Archive ouverte UNIGE |
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ftunivgeneve |
language |
English |
topic |
info:eu-repo/classification/ddc/550 |
spellingShingle |
info:eu-repo/classification/ddc/550 Nekrylov, N. A. Popov, Daniil Plechov, P. Yu. Shcherbakov, V. D. Danyushevsky, L. V. Dirksen, O. V. Garnet-Pyroxenite-Derived End-Member Magma Type in Kamchatka: Evidence from Composition of Olivine and Olivine-Hosted Melt Inclusions in Holocene Rocks of Kekuknaisky Volcano |
topic_facet |
info:eu-repo/classification/ddc/550 |
description |
Late Quaternary volcanoes of Sredinny Range (Kamchatka) attract geoscientists' attention by their unusual geochemical features and geodynamic setting. They produced volcanic rocks that are enriched relative to N-MORB in most of incompatible trace elements (except HREE), including strong enrichment in large-ion lithophile elements, and show a negative Nb–Ta anomaly, which is typical for rocks formed in supra-subduction settings. However, modern subduction of the Pacific Plate does not reach the most part of Sredinny Range, as inferred by mapping of Wadati–Benioff zone or seismic tomography. We constrain the source of parental magmas for Sredinny Range volcanic rocks by combining major and trace element geochemical data for olivine and naturally quenched olivine-hosed melt inclusions for Holocene tephra layers of the Kekuknaisky field. Composition of the most magnesian olivine (Ni > 2000 ppm, Fe/Mn ≈ 75 at Mg# ~ 84–85 mol %) and geochemical characteristics of the most primitive melts (FC3MS = 0.61 ± 0.04 (2s)) are consistent with their derivation from a pyroxenite source, while elevated LREE/HREE ratios in lavas indicate that it contained garnet. This garnet-bearing pyroxenite likely originated from the lower crust or lithospheric mantle. Its melting could have occurred due to delamination and sinking into the hotter mantle. |
format |
Article in Journal/Newspaper |
author |
Nekrylov, N. A. Popov, Daniil Plechov, P. Yu. Shcherbakov, V. D. Danyushevsky, L. V. Dirksen, O. V. |
author_facet |
Nekrylov, N. A. Popov, Daniil Plechov, P. Yu. Shcherbakov, V. D. Danyushevsky, L. V. Dirksen, O. V. |
author_sort |
Nekrylov, N. A. |
title |
Garnet-Pyroxenite-Derived End-Member Magma Type in Kamchatka: Evidence from Composition of Olivine and Olivine-Hosted Melt Inclusions in Holocene Rocks of Kekuknaisky Volcano |
title_short |
Garnet-Pyroxenite-Derived End-Member Magma Type in Kamchatka: Evidence from Composition of Olivine and Olivine-Hosted Melt Inclusions in Holocene Rocks of Kekuknaisky Volcano |
title_full |
Garnet-Pyroxenite-Derived End-Member Magma Type in Kamchatka: Evidence from Composition of Olivine and Olivine-Hosted Melt Inclusions in Holocene Rocks of Kekuknaisky Volcano |
title_fullStr |
Garnet-Pyroxenite-Derived End-Member Magma Type in Kamchatka: Evidence from Composition of Olivine and Olivine-Hosted Melt Inclusions in Holocene Rocks of Kekuknaisky Volcano |
title_full_unstemmed |
Garnet-Pyroxenite-Derived End-Member Magma Type in Kamchatka: Evidence from Composition of Olivine and Olivine-Hosted Melt Inclusions in Holocene Rocks of Kekuknaisky Volcano |
title_sort |
garnet-pyroxenite-derived end-member magma type in kamchatka: evidence from composition of olivine and olivine-hosted melt inclusions in holocene rocks of kekuknaisky volcano |
publishDate |
2018 |
url |
https://archive-ouverte.unige.ch/unige:112555 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_source |
ISSN: 0869-5911 Petrology, vol. 26, no. 4 (2018) p. 329-350 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1134/S0869591118040057 https://archive-ouverte.unige.ch/unige:112555 unige:112555 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1134/S0869591118040057 |
container_title |
Petrology |
container_volume |
26 |
container_issue |
4 |
container_start_page |
329 |
op_container_end_page |
350 |
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1778528041747611648 |