Melting phase equilibria of model carbonated peridotite from 8 to 12 GPa in the system CaO-MgO-Al2O3-SiO2-CO2 and kimberlitic liquids in the Earth's upper mantle
International audience Pressure-temperature divariant melting phase relations of model carbonated peridotite in the system CaO-MgO-Al2O3-SiO2-CO2 from 8 to 12 GPa are reported. From 8 to 12 GPa, melting temperatures on the studied pressure-temperature divariant surface rise quite rapidly. Liquids, i...
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ftunivantilles:oai:HAL:hal-01053915v1 2023-09-26T15:18:27+02:00 Melting phase equilibria of model carbonated peridotite from 8 to 12 GPa in the system CaO-MgO-Al2O3-SiO2-CO2 and kimberlitic liquids in the Earth's upper mantle Keshav, Shantanu Gudfinnsson, Gudmundur H. Manteau et Interfaces Géosciences Montpellier Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) University of Iceland Reykjavik 2014 https://hal.science/hal-01053915 https://doi.org/10.2138/am.2014.4826 en eng HAL CCSD Mineralogical Society of America info:eu-repo/semantics/altIdentifier/doi/10.2138/am.2014.4826 hal-01053915 https://hal.science/hal-01053915 doi:10.2138/am.2014.4826 ISSN: 0003-004X EISSN: 1945-3027 The American Mineralogist https://hal.science/hal-01053915 The American Mineralogist, 2014, 99 (5-6), pp.1119-1126. ⟨10.2138/am.2014.4826⟩ Kimberlites magma generation carbonated peridotite carbonatites diamonds [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography info:eu-repo/semantics/article Journal articles 2014 ftunivantilles https://doi.org/10.2138/am.2014.4826 2023-08-29T22:35:45Z International audience Pressure-temperature divariant melting phase relations of model carbonated peridotite in the system CaO-MgO-Al2O3-SiO2-CO2 from 8 to 12 GPa are reported. From 8 to 12 GPa, melting temperatures on the studied pressure-temperature divariant surface rise quite rapidly. Liquids, in equilibrium with forsterite, orthopyroxene, clinopyroxene, and garnet, on the low-temperature side of the divariant surface are magnesiocarbonatitic in composition. With increasing temperature along an isobar on the pressure-temperature divariant surface, and with the same crystalline phase assemblage, liquids gradually become kimberlitic in their composition. Given the model system data reported here, Group IB kimberlites and perhaps some kimberlites from Greenland, Canada, and South Africa could be generated from direct melting of carbonated peridotite in the pressure range of approximately 6-8 GPa. Some kimberlites from Canada and Russia could have formed by partial melting of carbonated mantle peridotite at pressures of about 10-12 GPa. From 8 to 12 GPa, liquid compositions on the studied divariant surface show a limited compositional range, which implies that the divariant surface is essentially flat. The implied flatness of the divariant surface, and so long as the liquid is in equilibrium with the crystalline assemblage of forsterite + orthopyroxene + clinopyroxene + garnet on the divariant surface, indicate that kimberlites belonging to Group IA and those more magnesian than Group IA cannot have their origin in only being a melting product of carbonated mantle peridotite. The absence of topography of the studied pressure-temperature divariant surface in all likelihood limits the generation of kimberlites in the Earth's upper mantle only. Article in Journal/Newspaper Greenland Université des Antilles (UAG): HAL Canada Greenland American Mineralogist 99 5-6 1119 1126 |
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Open Polar |
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Université des Antilles (UAG): HAL |
op_collection_id |
ftunivantilles |
language |
English |
topic |
Kimberlites magma generation carbonated peridotite carbonatites diamonds [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography |
spellingShingle |
Kimberlites magma generation carbonated peridotite carbonatites diamonds [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography Keshav, Shantanu Gudfinnsson, Gudmundur H. Melting phase equilibria of model carbonated peridotite from 8 to 12 GPa in the system CaO-MgO-Al2O3-SiO2-CO2 and kimberlitic liquids in the Earth's upper mantle |
topic_facet |
Kimberlites magma generation carbonated peridotite carbonatites diamonds [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography |
description |
International audience Pressure-temperature divariant melting phase relations of model carbonated peridotite in the system CaO-MgO-Al2O3-SiO2-CO2 from 8 to 12 GPa are reported. From 8 to 12 GPa, melting temperatures on the studied pressure-temperature divariant surface rise quite rapidly. Liquids, in equilibrium with forsterite, orthopyroxene, clinopyroxene, and garnet, on the low-temperature side of the divariant surface are magnesiocarbonatitic in composition. With increasing temperature along an isobar on the pressure-temperature divariant surface, and with the same crystalline phase assemblage, liquids gradually become kimberlitic in their composition. Given the model system data reported here, Group IB kimberlites and perhaps some kimberlites from Greenland, Canada, and South Africa could be generated from direct melting of carbonated peridotite in the pressure range of approximately 6-8 GPa. Some kimberlites from Canada and Russia could have formed by partial melting of carbonated mantle peridotite at pressures of about 10-12 GPa. From 8 to 12 GPa, liquid compositions on the studied divariant surface show a limited compositional range, which implies that the divariant surface is essentially flat. The implied flatness of the divariant surface, and so long as the liquid is in equilibrium with the crystalline assemblage of forsterite + orthopyroxene + clinopyroxene + garnet on the divariant surface, indicate that kimberlites belonging to Group IA and those more magnesian than Group IA cannot have their origin in only being a melting product of carbonated mantle peridotite. The absence of topography of the studied pressure-temperature divariant surface in all likelihood limits the generation of kimberlites in the Earth's upper mantle only. |
author2 |
Manteau et Interfaces Géosciences Montpellier Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) University of Iceland Reykjavik |
format |
Article in Journal/Newspaper |
author |
Keshav, Shantanu Gudfinnsson, Gudmundur H. |
author_facet |
Keshav, Shantanu Gudfinnsson, Gudmundur H. |
author_sort |
Keshav, Shantanu |
title |
Melting phase equilibria of model carbonated peridotite from 8 to 12 GPa in the system CaO-MgO-Al2O3-SiO2-CO2 and kimberlitic liquids in the Earth's upper mantle |
title_short |
Melting phase equilibria of model carbonated peridotite from 8 to 12 GPa in the system CaO-MgO-Al2O3-SiO2-CO2 and kimberlitic liquids in the Earth's upper mantle |
title_full |
Melting phase equilibria of model carbonated peridotite from 8 to 12 GPa in the system CaO-MgO-Al2O3-SiO2-CO2 and kimberlitic liquids in the Earth's upper mantle |
title_fullStr |
Melting phase equilibria of model carbonated peridotite from 8 to 12 GPa in the system CaO-MgO-Al2O3-SiO2-CO2 and kimberlitic liquids in the Earth's upper mantle |
title_full_unstemmed |
Melting phase equilibria of model carbonated peridotite from 8 to 12 GPa in the system CaO-MgO-Al2O3-SiO2-CO2 and kimberlitic liquids in the Earth's upper mantle |
title_sort |
melting phase equilibria of model carbonated peridotite from 8 to 12 gpa in the system cao-mgo-al2o3-sio2-co2 and kimberlitic liquids in the earth's upper mantle |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.science/hal-01053915 https://doi.org/10.2138/am.2014.4826 |
geographic |
Canada Greenland |
geographic_facet |
Canada Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
ISSN: 0003-004X EISSN: 1945-3027 The American Mineralogist https://hal.science/hal-01053915 The American Mineralogist, 2014, 99 (5-6), pp.1119-1126. ⟨10.2138/am.2014.4826⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.2138/am.2014.4826 hal-01053915 https://hal.science/hal-01053915 doi:10.2138/am.2014.4826 |
op_doi |
https://doi.org/10.2138/am.2014.4826 |
container_title |
American Mineralogist |
container_volume |
99 |
container_issue |
5-6 |
container_start_page |
1119 |
op_container_end_page |
1126 |
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1778140739280044032 |