An insight into the first stages of the Ferrar magmatism: ultramafic cumulates from Harrow Peaks, northern Victoria Land, Antarctica
International audience A group of ultramafic xenoliths hosted in Cenozoic hypabyssal rocks from Harrow Peaks (northern Victoria Land, Antarctica) show textural and geochemical features far removed from anything previously observed in mantle xenoliths of this region and elsewhere in Antarctica. They...
Published in: | Contributions to Mineralogy and Petrology |
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Main Authors: | , , , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2019
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Subjects: | |
Online Access: | https://hal.science/hal-02363207 https://hal.science/hal-02363207/document https://hal.science/hal-02363207/file/Pelorosso%20et%20al_2019.pdf https://doi.org/10.1007/s00410-019-1579-1 |
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ftinsu:oai:HAL:hal-02363207v1 |
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openpolar |
institution |
Open Polar |
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Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
ultramafic xenoliths high-Mg magmatic olivines orthopyroxenite Karoo-Ferrar large igneous province [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy |
spellingShingle |
ultramafic xenoliths high-Mg magmatic olivines orthopyroxenite Karoo-Ferrar large igneous province [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy Pelorosso, Beatrice Bonadiman, Costanza Ntaflos, Theodoros Gregoire, Michel Gentili, Silvia Zanetti, Alberto Coltorti, Massimo An insight into the first stages of the Ferrar magmatism: ultramafic cumulates from Harrow Peaks, northern Victoria Land, Antarctica |
topic_facet |
ultramafic xenoliths high-Mg magmatic olivines orthopyroxenite Karoo-Ferrar large igneous province [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy |
description |
International audience A group of ultramafic xenoliths hosted in Cenozoic hypabyssal rocks from Harrow Peaks (northern Victoria Land, Antarctica) show textural and geochemical features far removed from anything previously observed in mantle xenoliths of this region and elsewhere in Antarctica. They consist of spinel-bearing lherzolites and harzburgites, characterised by a predominant equigranular texture with orthopyroxene modal contents remarkably higher in lherzolites (18-26 volume%) with respect to the harzburgite (13 vol%), one orthopyroxenite, and three composite xenoliths. The latter are formed by an olivine-dominant assemblage (olivine > 70%) crosscut by large monomineralic (amphibole or clinopyroxene) or bimineralic (amphibole + clino-pyroxene) veins. No significant correlation was observed between the lithology and the Fo content (90.21-82.81) of olivine, suggesting that these rocks could be derived from a cumulus process. The presence of the orthopyroxenite suggests that the inferred melt/s from which they stemmed was close (or even above) to silica saturation. Based on major and trace-element mineral/melt and mineral/mineral equilibrium modelling, these rocks were formed by progressive extraction of olivine from a high magnesium (Mg = 72)-high temperature (~ 1300 °C) melt following a very short fractionation line. Thermobaro-metric results indicate the stationing of Harrow Peaks cumulates in the P field of 1.3 ± 0.2 (dunites)-0.5 ± 0.2 (orthopy-roxenite) GPa. These values well match the crust/mantle boundary (Moho) of the region. The combined geochemical and petrological data suggest that Harrow Peaks melts could be related to the initial stage of the Jurassic Ferrar magmatism, whose deep cumulates were subsequently affected by the Cenozoic alkaline metasomatism, widely detected in the northern Victoria Land lithosphere and responsible for the formation of the late amphibole/amphibole + clinopyroxene veins. |
author2 |
Dipartimento di Fisica e Scienze della Terra Ferrara Università degli Studi di Ferrara = University of Ferrara (UniFE) Department of Lithospheric Research Wien Universität Wien Géosciences Environnement Toulouse (GET) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Dipartimento di Fisica e Geologia Perugia Università degli Studi di Perugia = University of Perugia (UNIPG) Instituto di Geoscienze e Georisorse National Research Council of Italy |
format |
Article in Journal/Newspaper |
author |
Pelorosso, Beatrice Bonadiman, Costanza Ntaflos, Theodoros Gregoire, Michel Gentili, Silvia Zanetti, Alberto Coltorti, Massimo |
author_facet |
Pelorosso, Beatrice Bonadiman, Costanza Ntaflos, Theodoros Gregoire, Michel Gentili, Silvia Zanetti, Alberto Coltorti, Massimo |
author_sort |
Pelorosso, Beatrice |
title |
An insight into the first stages of the Ferrar magmatism: ultramafic cumulates from Harrow Peaks, northern Victoria Land, Antarctica |
title_short |
An insight into the first stages of the Ferrar magmatism: ultramafic cumulates from Harrow Peaks, northern Victoria Land, Antarctica |
title_full |
An insight into the first stages of the Ferrar magmatism: ultramafic cumulates from Harrow Peaks, northern Victoria Land, Antarctica |
title_fullStr |
An insight into the first stages of the Ferrar magmatism: ultramafic cumulates from Harrow Peaks, northern Victoria Land, Antarctica |
title_full_unstemmed |
An insight into the first stages of the Ferrar magmatism: ultramafic cumulates from Harrow Peaks, northern Victoria Land, Antarctica |
title_sort |
insight into the first stages of the ferrar magmatism: ultramafic cumulates from harrow peaks, northern victoria land, antarctica |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-02363207 https://hal.science/hal-02363207/document https://hal.science/hal-02363207/file/Pelorosso%20et%20al_2019.pdf https://doi.org/10.1007/s00410-019-1579-1 |
long_lat |
ENVELOPE(164.750,164.750,-74.067,-74.067) |
geographic |
Harrow Peaks Victoria Land |
geographic_facet |
Harrow Peaks Victoria Land |
genre |
Antarc* Antarctica Victoria Land |
genre_facet |
Antarc* Antarctica Victoria Land |
op_source |
ISSN: 0010-7999 EISSN: 1432-0967 Contributions to Mineralogy and Petrology https://hal.science/hal-02363207 Contributions to Mineralogy and Petrology, 2019, 174 (5), ⟨10.1007/s00410-019-1579-1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s00410-019-1579-1 hal-02363207 https://hal.science/hal-02363207 https://hal.science/hal-02363207/document https://hal.science/hal-02363207/file/Pelorosso%20et%20al_2019.pdf doi:10.1007/s00410-019-1579-1 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1007/s00410-019-1579-1 |
container_title |
Contributions to Mineralogy and Petrology |
container_volume |
174 |
container_issue |
5 |
_version_ |
1785529887469076480 |
spelling |
ftinsu:oai:HAL:hal-02363207v1 2023-12-17T10:21:07+01:00 An insight into the first stages of the Ferrar magmatism: ultramafic cumulates from Harrow Peaks, northern Victoria Land, Antarctica Pelorosso, Beatrice Bonadiman, Costanza Ntaflos, Theodoros Gregoire, Michel Gentili, Silvia Zanetti, Alberto Coltorti, Massimo Dipartimento di Fisica e Scienze della Terra Ferrara Università degli Studi di Ferrara = University of Ferrara (UniFE) Department of Lithospheric Research Wien Universität Wien Géosciences Environnement Toulouse (GET) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Dipartimento di Fisica e Geologia Perugia Università degli Studi di Perugia = University of Perugia (UNIPG) Instituto di Geoscienze e Georisorse National Research Council of Italy 2019 https://hal.science/hal-02363207 https://hal.science/hal-02363207/document https://hal.science/hal-02363207/file/Pelorosso%20et%20al_2019.pdf https://doi.org/10.1007/s00410-019-1579-1 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00410-019-1579-1 hal-02363207 https://hal.science/hal-02363207 https://hal.science/hal-02363207/document https://hal.science/hal-02363207/file/Pelorosso%20et%20al_2019.pdf doi:10.1007/s00410-019-1579-1 info:eu-repo/semantics/OpenAccess ISSN: 0010-7999 EISSN: 1432-0967 Contributions to Mineralogy and Petrology https://hal.science/hal-02363207 Contributions to Mineralogy and Petrology, 2019, 174 (5), ⟨10.1007/s00410-019-1579-1⟩ ultramafic xenoliths high-Mg magmatic olivines orthopyroxenite Karoo-Ferrar large igneous province [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy info:eu-repo/semantics/article Journal articles 2019 ftinsu https://doi.org/10.1007/s00410-019-1579-1 2023-11-22T17:39:14Z International audience A group of ultramafic xenoliths hosted in Cenozoic hypabyssal rocks from Harrow Peaks (northern Victoria Land, Antarctica) show textural and geochemical features far removed from anything previously observed in mantle xenoliths of this region and elsewhere in Antarctica. They consist of spinel-bearing lherzolites and harzburgites, characterised by a predominant equigranular texture with orthopyroxene modal contents remarkably higher in lherzolites (18-26 volume%) with respect to the harzburgite (13 vol%), one orthopyroxenite, and three composite xenoliths. The latter are formed by an olivine-dominant assemblage (olivine > 70%) crosscut by large monomineralic (amphibole or clinopyroxene) or bimineralic (amphibole + clino-pyroxene) veins. No significant correlation was observed between the lithology and the Fo content (90.21-82.81) of olivine, suggesting that these rocks could be derived from a cumulus process. The presence of the orthopyroxenite suggests that the inferred melt/s from which they stemmed was close (or even above) to silica saturation. Based on major and trace-element mineral/melt and mineral/mineral equilibrium modelling, these rocks were formed by progressive extraction of olivine from a high magnesium (Mg = 72)-high temperature (~ 1300 °C) melt following a very short fractionation line. Thermobaro-metric results indicate the stationing of Harrow Peaks cumulates in the P field of 1.3 ± 0.2 (dunites)-0.5 ± 0.2 (orthopy-roxenite) GPa. These values well match the crust/mantle boundary (Moho) of the region. The combined geochemical and petrological data suggest that Harrow Peaks melts could be related to the initial stage of the Jurassic Ferrar magmatism, whose deep cumulates were subsequently affected by the Cenozoic alkaline metasomatism, widely detected in the northern Victoria Land lithosphere and responsible for the formation of the late amphibole/amphibole + clinopyroxene veins. Article in Journal/Newspaper Antarc* Antarctica Victoria Land Institut national des sciences de l'Univers: HAL-INSU Harrow Peaks ENVELOPE(164.750,164.750,-74.067,-74.067) Victoria Land Contributions to Mineralogy and Petrology 174 5 |