Role of percolating melts in Antarctic subcontinental lithospheric mantle: New insights from Handler Ridge mantle xenoliths (northern Victoria Land, Antarctica)
The petrology of anhydrous peridotite xenoliths hosted in the Cenozoic alkaline volcanic rocks from Handler Ridge (northern Victoria Land, Antarctica) provides new constraints on the characterization of the subcontinental lithospheric mantle beneath the West Antarctic Rift. For most samples, the tem...
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ftunivferrarair:oai:sfera.unife.it:11392/2370704 2024-04-21T07:52:24+00:00 Role of percolating melts in Antarctic subcontinental lithospheric mantle: New insights from Handler Ridge mantle xenoliths (northern Victoria Land, Antarctica) PELOROSSO, Beatrice BONADIMAN, Costanza COLTORTI, Massimo MELCHIORRE, Massimiliano GIACOMONI, Pier Paolo NTAFLOS, Theodoros GREGOIRE, Michel Benoit, Mathieu B. Pelorosso, C. Bonadiman, M. Coltorti, M. Melchiorre, P. P. Giacomoni, T. Ntaflos, M. Gregoire, M. Benoit G. Bianchini, J.-L. Bodinier , R. Braga , M. Wilson Pelorosso, Beatrice Bonadiman, Costanza Coltorti, Massimo Melchiorre, Massimiliano Giacomoni, Pier Paolo Ntaflos, Theodoro Gregoire, Michel Benoit, Mathieu 2017 STAMPA http://hdl.handle.net/11392/2370704 eng eng The Geological Society of America country:USA info:eu-repo/semantics/altIdentifier/wos/WOS:000540369200007 ispartofbook:The Crust-Mantle and Lithosphere-Asthenosphere Boundaries: Insights from Xenoliths, Orogenic Deep Sections, and Geophysical Studies: Geological Society of America Special Paper 526 volume:526 firstpage:1 lastpage:1-18 numberofpages:18 alleditors:G. Bianchini, J.-L. Bodinier , R. Braga , M. Wilson http://hdl.handle.net/11392/2370704 10.1130/2017.2526(07) info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85021661043 info:eu-repo/semantics/bookPart 2017 ftunivferrarair 2024-03-28T01:24:26Z The petrology of anhydrous peridotite xenoliths hosted in the Cenozoic alkaline volcanic rocks from Handler Ridge (northern Victoria Land, Antarctica) provides new constraints on the characterization of the subcontinental lithospheric mantle beneath the West Antarctic Rift. For most samples, the temperature of equilibration was calculated on the basis of Fe/Mg partitioning among olivine, orthopyroxene, and spinel, at a pressure of 15 kbar. These results revealed a temperature of ~1030 °C and fO2 ranging from –0.26 to +0.39 with respect to fayalite-magnetite-quartz buffer (ΔFMQ). Compared with other anhydrous and hydrated mantle xenolith suites occurring in northern and southern Victoria Land, these xenoliths represent the highest-temperature and most-oxidized conditions. On the basis of major-element modeling, we suggest that this portion of the mantle represents a residuum after 7%–18% partial melting. Geochemical and isotopic compositional evidence is indicative of signifi cant metasomatism caused by an alkaline melt almost entirely overprinting the residual peridotite composition within a period of 102–103 yr. Book Part Antarc* Antarctic Antarctica Victoria Land Università degli Studi di Ferrara: CINECA IRIS |
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Open Polar |
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Università degli Studi di Ferrara: CINECA IRIS |
op_collection_id |
ftunivferrarair |
language |
English |
description |
The petrology of anhydrous peridotite xenoliths hosted in the Cenozoic alkaline volcanic rocks from Handler Ridge (northern Victoria Land, Antarctica) provides new constraints on the characterization of the subcontinental lithospheric mantle beneath the West Antarctic Rift. For most samples, the temperature of equilibration was calculated on the basis of Fe/Mg partitioning among olivine, orthopyroxene, and spinel, at a pressure of 15 kbar. These results revealed a temperature of ~1030 °C and fO2 ranging from –0.26 to +0.39 with respect to fayalite-magnetite-quartz buffer (ΔFMQ). Compared with other anhydrous and hydrated mantle xenolith suites occurring in northern and southern Victoria Land, these xenoliths represent the highest-temperature and most-oxidized conditions. On the basis of major-element modeling, we suggest that this portion of the mantle represents a residuum after 7%–18% partial melting. Geochemical and isotopic compositional evidence is indicative of signifi cant metasomatism caused by an alkaline melt almost entirely overprinting the residual peridotite composition within a period of 102–103 yr. |
author2 |
B. Pelorosso, C. Bonadiman, M. Coltorti, M. Melchiorre, P. P. Giacomoni, T. Ntaflos, M. Gregoire, M. Benoit G. Bianchini, J.-L. Bodinier , R. Braga , M. Wilson Pelorosso, Beatrice Bonadiman, Costanza Coltorti, Massimo Melchiorre, Massimiliano Giacomoni, Pier Paolo Ntaflos, Theodoro Gregoire, Michel Benoit, Mathieu |
format |
Book Part |
author |
PELOROSSO, Beatrice BONADIMAN, Costanza COLTORTI, Massimo MELCHIORRE, Massimiliano GIACOMONI, Pier Paolo NTAFLOS, Theodoros GREGOIRE, Michel Benoit, Mathieu |
spellingShingle |
PELOROSSO, Beatrice BONADIMAN, Costanza COLTORTI, Massimo MELCHIORRE, Massimiliano GIACOMONI, Pier Paolo NTAFLOS, Theodoros GREGOIRE, Michel Benoit, Mathieu Role of percolating melts in Antarctic subcontinental lithospheric mantle: New insights from Handler Ridge mantle xenoliths (northern Victoria Land, Antarctica) |
author_facet |
PELOROSSO, Beatrice BONADIMAN, Costanza COLTORTI, Massimo MELCHIORRE, Massimiliano GIACOMONI, Pier Paolo NTAFLOS, Theodoros GREGOIRE, Michel Benoit, Mathieu |
author_sort |
PELOROSSO, Beatrice |
title |
Role of percolating melts in Antarctic subcontinental lithospheric mantle: New insights from Handler Ridge mantle xenoliths (northern Victoria Land, Antarctica) |
title_short |
Role of percolating melts in Antarctic subcontinental lithospheric mantle: New insights from Handler Ridge mantle xenoliths (northern Victoria Land, Antarctica) |
title_full |
Role of percolating melts in Antarctic subcontinental lithospheric mantle: New insights from Handler Ridge mantle xenoliths (northern Victoria Land, Antarctica) |
title_fullStr |
Role of percolating melts in Antarctic subcontinental lithospheric mantle: New insights from Handler Ridge mantle xenoliths (northern Victoria Land, Antarctica) |
title_full_unstemmed |
Role of percolating melts in Antarctic subcontinental lithospheric mantle: New insights from Handler Ridge mantle xenoliths (northern Victoria Land, Antarctica) |
title_sort |
role of percolating melts in antarctic subcontinental lithospheric mantle: new insights from handler ridge mantle xenoliths (northern victoria land, antarctica) |
publisher |
The Geological Society of America |
publishDate |
2017 |
url |
http://hdl.handle.net/11392/2370704 |
genre |
Antarc* Antarctic Antarctica Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica Victoria Land |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000540369200007 ispartofbook:The Crust-Mantle and Lithosphere-Asthenosphere Boundaries: Insights from Xenoliths, Orogenic Deep Sections, and Geophysical Studies: Geological Society of America Special Paper 526 volume:526 firstpage:1 lastpage:1-18 numberofpages:18 alleditors:G. Bianchini, J.-L. Bodinier , R. Braga , M. Wilson http://hdl.handle.net/11392/2370704 10.1130/2017.2526(07) info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85021661043 |
_version_ |
1796935642391773184 |