Primary Silica-rich Picrite and High-Ca Boninite Melt Inclusions in Pyroxenite Veins from the Kamchatka Sub-arc Mantle
International audience Island arc picrites and boninites are magnesian magmatic rocks believed to be generated by high degrees of melting of depleted mantle sources fluxed by subduction-derived, volatile-rich components. These magmas can be probes of both the mantle wedge protoliths and subduction c...
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ftinsu:oai:HAL:hal-01553676v1 2023-06-18T03:41:30+02:00 Primary Silica-rich Picrite and High-Ca Boninite Melt Inclusions in Pyroxenite Veins from the Kamchatka Sub-arc Mantle Benard, A. Nebel, O. Ionov, Dmitri Arculus, R. J. Shimizu, N. Metrich, N. Research School of Earth Sciences Canberra (RSES) Australian National University (ANU) Géosciences Montpellier Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) Woods Hole Oceanographic Institution (WHOI) Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) 2016-10 https://hal.science/hal-01553676 https://doi.org/10.1093/petrology/egw066 en eng HAL CCSD Oxford University Press (OUP) info:eu-repo/semantics/altIdentifier/doi/10.1093/petrology/egw066 hal-01553676 https://hal.science/hal-01553676 doi:10.1093/petrology/egw066 ISSN: 0022-3530 EISSN: 1460-2415 Journal of Petrology https://hal.science/hal-01553676 Journal of Petrology, 2016, 57 (10), pp.1955-1982. ⟨10.1093/petrology/egw066⟩ island arc subduction partial melting picrite boninite mantle xenolith mantle wedge high field strength elements pyroxenite melt inclusions [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2016 ftinsu https://doi.org/10.1093/petrology/egw066 2023-06-06T00:42:56Z International audience Island arc picrites and boninites are magnesian magmatic rocks believed to be generated by high degrees of melting of depleted mantle sources fluxed by subduction-derived, volatile-rich components. These magmas can be probes of both the mantle wedge protoliths and subduction components, but are rare among other, usually more evolved, types of arc lavas. Furthermore, many arc picrites and boninites show evidence for late-stage differentiation prior to or during eruption, masking their primary, mantle-derived geochemical signatures. We report textural and chemical data on spinel-hosted melt inclusions of mantle origin in amphibole-bearing websterite veins cross-cutting spinel harzburgite xenoliths from the active andesitic Avacha volcano (south Kamchatka, Russia). The data are used to constrain the composition and origin of melts that formed the websterite veins in the sub-arc lithospheric mantle. The melt inclusions typically contain euhedral orthopyroxene and clinopyroxene and occasionally minor amphibole in silicate glass. The melt inclusions were homogenized using heating stages and gas-mixing furnaces. The homogenized glasses range from subalkaline primitive silica-rich picrite and high-Ca boninite (>15 wt % MgO, 48–54 wt % SiO2) to rhyolite. High-Ca boninite glasses have moderate volatile and low heavy rare earth element contents and elevated Cs, Rb, Ba, U, Sr, and Li abundances, with extremely high U/Th. In turn, the glasses display no negative spikes in the high field strength elements Nb, Ta, Zr, Hf, and Ti. We show that the silica-rich picrite and high-Ca boninite liquids in this study formed by high degrees of melting (>25%), at volatile under-saturation, of hybrid melt-depleted but silica-rich mantle sources at ≥1·5 GPa. The hybrid sources formed in two stages: first, by extraction of ∼15% melt from the convecting mantle to form a refractory protolith, which was subsequently enriched in silica via interaction with subduction-derived components prior to or during remelting ... Article in Journal/Newspaper Kamchatka Institut national des sciences de l'Univers: HAL-INSU Avacha ENVELOPE(158.503,158.503,53.040,53.040) Journal of Petrology 57 10 1955 1982 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
island arc subduction partial melting picrite boninite mantle xenolith mantle wedge high field strength elements pyroxenite melt inclusions [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
island arc subduction partial melting picrite boninite mantle xenolith mantle wedge high field strength elements pyroxenite melt inclusions [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Benard, A. Nebel, O. Ionov, Dmitri Arculus, R. J. Shimizu, N. Metrich, N. Primary Silica-rich Picrite and High-Ca Boninite Melt Inclusions in Pyroxenite Veins from the Kamchatka Sub-arc Mantle |
topic_facet |
island arc subduction partial melting picrite boninite mantle xenolith mantle wedge high field strength elements pyroxenite melt inclusions [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience Island arc picrites and boninites are magnesian magmatic rocks believed to be generated by high degrees of melting of depleted mantle sources fluxed by subduction-derived, volatile-rich components. These magmas can be probes of both the mantle wedge protoliths and subduction components, but are rare among other, usually more evolved, types of arc lavas. Furthermore, many arc picrites and boninites show evidence for late-stage differentiation prior to or during eruption, masking their primary, mantle-derived geochemical signatures. We report textural and chemical data on spinel-hosted melt inclusions of mantle origin in amphibole-bearing websterite veins cross-cutting spinel harzburgite xenoliths from the active andesitic Avacha volcano (south Kamchatka, Russia). The data are used to constrain the composition and origin of melts that formed the websterite veins in the sub-arc lithospheric mantle. The melt inclusions typically contain euhedral orthopyroxene and clinopyroxene and occasionally minor amphibole in silicate glass. The melt inclusions were homogenized using heating stages and gas-mixing furnaces. The homogenized glasses range from subalkaline primitive silica-rich picrite and high-Ca boninite (>15 wt % MgO, 48–54 wt % SiO2) to rhyolite. High-Ca boninite glasses have moderate volatile and low heavy rare earth element contents and elevated Cs, Rb, Ba, U, Sr, and Li abundances, with extremely high U/Th. In turn, the glasses display no negative spikes in the high field strength elements Nb, Ta, Zr, Hf, and Ti. We show that the silica-rich picrite and high-Ca boninite liquids in this study formed by high degrees of melting (>25%), at volatile under-saturation, of hybrid melt-depleted but silica-rich mantle sources at ≥1·5 GPa. The hybrid sources formed in two stages: first, by extraction of ∼15% melt from the convecting mantle to form a refractory protolith, which was subsequently enriched in silica via interaction with subduction-derived components prior to or during remelting ... |
author2 |
Research School of Earth Sciences Canberra (RSES) Australian National University (ANU) Géosciences Montpellier Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) Woods Hole Oceanographic Institution (WHOI) Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Benard, A. Nebel, O. Ionov, Dmitri Arculus, R. J. Shimizu, N. Metrich, N. |
author_facet |
Benard, A. Nebel, O. Ionov, Dmitri Arculus, R. J. Shimizu, N. Metrich, N. |
author_sort |
Benard, A. |
title |
Primary Silica-rich Picrite and High-Ca Boninite Melt Inclusions in Pyroxenite Veins from the Kamchatka Sub-arc Mantle |
title_short |
Primary Silica-rich Picrite and High-Ca Boninite Melt Inclusions in Pyroxenite Veins from the Kamchatka Sub-arc Mantle |
title_full |
Primary Silica-rich Picrite and High-Ca Boninite Melt Inclusions in Pyroxenite Veins from the Kamchatka Sub-arc Mantle |
title_fullStr |
Primary Silica-rich Picrite and High-Ca Boninite Melt Inclusions in Pyroxenite Veins from the Kamchatka Sub-arc Mantle |
title_full_unstemmed |
Primary Silica-rich Picrite and High-Ca Boninite Melt Inclusions in Pyroxenite Veins from the Kamchatka Sub-arc Mantle |
title_sort |
primary silica-rich picrite and high-ca boninite melt inclusions in pyroxenite veins from the kamchatka sub-arc mantle |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.science/hal-01553676 https://doi.org/10.1093/petrology/egw066 |
long_lat |
ENVELOPE(158.503,158.503,53.040,53.040) |
geographic |
Avacha |
geographic_facet |
Avacha |
genre |
Kamchatka |
genre_facet |
Kamchatka |
op_source |
ISSN: 0022-3530 EISSN: 1460-2415 Journal of Petrology https://hal.science/hal-01553676 Journal of Petrology, 2016, 57 (10), pp.1955-1982. ⟨10.1093/petrology/egw066⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1093/petrology/egw066 hal-01553676 https://hal.science/hal-01553676 doi:10.1093/petrology/egw066 |
op_doi |
https://doi.org/10.1093/petrology/egw066 |
container_title |
Journal of Petrology |
container_volume |
57 |
container_issue |
10 |
container_start_page |
1955 |
op_container_end_page |
1982 |
_version_ |
1769007122034458624 |