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 enrichment in...
Published in: | Petrology |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Interperiodica
2018
|
Subjects: | |
Online Access: | https://doi.org/10.1134/S0869591118040057 http://ecite.utas.edu.au/144718 |
id |
ftunivtasecite:oai:ecite.utas.edu.au:144718 |
---|---|
record_format |
openpolar |
spelling |
ftunivtasecite:oai:ecite.utas.edu.au:144718 2023-05-15T16:58:59+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, NA Popov, DV Plechov, PY Shcherbakov, VD Danyushevsky, LV Dirksen, OV 2018 https://doi.org/10.1134/S0869591118040057 http://ecite.utas.edu.au/144718 en eng Interperiodica http://dx.doi.org/10.1134/S0869591118040057 http://purl.org/au-research/grants/arc/CE0561595 Nekrylov, NA and Popov, DV and Plechov, PY and Shcherbakov, VD and Danyushevsky, LV and Dirksen, OV, 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, Petrology, 26, (4) pp. 329-350. ISSN 0869-5911 (2018) [Refereed Article] http://ecite.utas.edu.au/144718 Earth Sciences Geology Igneous and metamorphic petrology Refereed Article PeerReviewed 2018 ftunivtasecite https://doi.org/10.1134/S0869591118040057 2021-08-16T22:16:29Z 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 NbTa 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 WadatiBenioff 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# ~ 8485 mol %) and geochemical characteristics of the most primitive melts (FC3MS = 0.61 0.04 (2σ)) 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 eCite UTAS (University of Tasmania) Pacific Petrology 26 4 329 350 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Geology Igneous and metamorphic petrology |
spellingShingle |
Earth Sciences Geology Igneous and metamorphic petrology Nekrylov, NA Popov, DV Plechov, PY Shcherbakov, VD Danyushevsky, LV Dirksen, OV 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 |
Earth Sciences Geology Igneous and metamorphic petrology |
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 NbTa 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 WadatiBenioff 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# ~ 8485 mol %) and geochemical characteristics of the most primitive melts (FC3MS = 0.61 0.04 (2σ)) 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, NA Popov, DV Plechov, PY Shcherbakov, VD Danyushevsky, LV Dirksen, OV |
author_facet |
Nekrylov, NA Popov, DV Plechov, PY Shcherbakov, VD Danyushevsky, LV Dirksen, OV |
author_sort |
Nekrylov, NA |
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 |
publisher |
Interperiodica |
publishDate |
2018 |
url |
https://doi.org/10.1134/S0869591118040057 http://ecite.utas.edu.au/144718 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_relation |
http://dx.doi.org/10.1134/S0869591118040057 http://purl.org/au-research/grants/arc/CE0561595 Nekrylov, NA and Popov, DV and Plechov, PY and Shcherbakov, VD and Danyushevsky, LV and Dirksen, OV, 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, Petrology, 26, (4) pp. 329-350. ISSN 0869-5911 (2018) [Refereed Article] http://ecite.utas.edu.au/144718 |
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 |
_version_ |
1766051122013798400 |