Mn-Cr systematics in primitive meteorites: Insights from mineral separation and partial dissolution
International audience Cr isotopic compositions have been measured on carbonaceous chondrites (CC): Tafassasset, Paris, Niger I, NWA 5958, NWA 8157 and Jbilet Winselwan. In bulk samples, the Cr-54/Cr-52 ratios (expressed as epsilon Cr-54) range from 0.93 to 1.58 epsilon units. These values are in ag...
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HAL CCSD
2015
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Online Access: | https://insu.hal.science/insu-01164061 https://doi.org/10.1016/j.gea.2015.02.008 |
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ftunilorrainehal:oai:HAL:insu-01164061v1 |
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EARLY SOLAR-SYSTEM CHROMIUM ISOTOPE SYSTEMATICS UNGROUPED CARBONACEOUS CHONDRITE PARENT BODY TAGISH LAKE MN-53-CR-53 CHRONOMETRY PROTOPLANETARY DISK ALLENDE INCLUSIONS CORE FORMATION CHRONOLOGY [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
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EARLY SOLAR-SYSTEM CHROMIUM ISOTOPE SYSTEMATICS UNGROUPED CARBONACEOUS CHONDRITE PARENT BODY TAGISH LAKE MN-53-CR-53 CHRONOMETRY PROTOPLANETARY DISK ALLENDE INCLUSIONS CORE FORMATION CHRONOLOGY [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Göpel, Christa Birck, Jean-Louis Galy, Albert Barrat, Jean-Alix, J-A Zanda, Brigitte Mn-Cr systematics in primitive meteorites: Insights from mineral separation and partial dissolution |
topic_facet |
EARLY SOLAR-SYSTEM CHROMIUM ISOTOPE SYSTEMATICS UNGROUPED CARBONACEOUS CHONDRITE PARENT BODY TAGISH LAKE MN-53-CR-53 CHRONOMETRY PROTOPLANETARY DISK ALLENDE INCLUSIONS CORE FORMATION CHRONOLOGY [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience Cr isotopic compositions have been measured on carbonaceous chondrites (CC): Tafassasset, Paris, Niger I, NWA 5958, NWA 8157 and Jbilet Winselwan. In bulk samples, the Cr-54/Cr-52 ratios (expressed as epsilon Cr-54) range from 0.93 to 1.58 epsilon units. These values are in agreement with values characteristic for distinct petrologic types. Despite this 54 Cr heterogeneity, the variability in the Cr-54/Cr-52 ratios (expressed as epsilon Cr-53) of 0.2 epsilon units and the Mn/Cr ratios is consistent with the previous finding of an isochron in the Mn-Cr evolution diagram.The Mn/Cr ratio in CC corresponds to variable abundances of high-T condensate formed and separated at the beginning of the solar system, thus the canonical Mn-53/Mn-55 ratio can be defined. Based on a consistent chronology for U-Pb and Mn-Cr between the earliest objects formed in the solar nebula and the D'Orbigny angrite we define a canonical Mn-53/Mn-55 ratio and epsilon Cr-53(i) of 6.8 x 10(-6) and -0.177, respectively.The internal Mn/Cr systematics in Tafassasset and Paris were studied by two approaches: leaching technique and mineral separation. Despite variable epsilon Cr-54 values (up to >30 epsilon) linear co-variations were found between epsilon Cr-53 and Mn/Cr ratio. The mineral separates as well as the leachates of Tafassasset fall on a common isochron indicating that (1) cooling of the Tafassasset's parent body occurred at 4563.5 +/- 0.25 Ma, and that (2) Cr-54 is decoupled from the other isotopes even though temperatures >900 degrees C have been reached during metamorphism. In the case of Paris, the leachates form an alignment with a Mn-53/Mn-55 ratio higher than the canonical value. This alignment is not an isochron but rather a mixing line. Based on leachates from various CM and CI, we propose the occurrence of three distinct Cr reservoirs in meteoritic material: PURE54, HIGH53 and LOW53 characterized by a epsilon Cr-53 and epsilon Cr-54 of 0 and 25,000, -2.17 and 8, and 0.5 and -151, respectively. ... |
author2 |
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) Department of Earth Sciences Cambridge, UK University of Cambridge UK (CAM) Centre de Recherches Pétrographiques et Géochimiques (CRPG) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC) Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement IRD : UR206-Centre National de la Recherche Scientifique (CNRS) ANR-08-BLAN-0260,T-Tauri.Chem.,La Chimie du disque solaire T-Tauri(2008) |
format |
Article in Journal/Newspaper |
author |
Göpel, Christa Birck, Jean-Louis Galy, Albert Barrat, Jean-Alix, J-A Zanda, Brigitte |
author_facet |
Göpel, Christa Birck, Jean-Louis Galy, Albert Barrat, Jean-Alix, J-A Zanda, Brigitte |
author_sort |
Göpel, Christa |
title |
Mn-Cr systematics in primitive meteorites: Insights from mineral separation and partial dissolution |
title_short |
Mn-Cr systematics in primitive meteorites: Insights from mineral separation and partial dissolution |
title_full |
Mn-Cr systematics in primitive meteorites: Insights from mineral separation and partial dissolution |
title_fullStr |
Mn-Cr systematics in primitive meteorites: Insights from mineral separation and partial dissolution |
title_full_unstemmed |
Mn-Cr systematics in primitive meteorites: Insights from mineral separation and partial dissolution |
title_sort |
mn-cr systematics in primitive meteorites: insights from mineral separation and partial dissolution |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://insu.hal.science/insu-01164061 https://doi.org/10.1016/j.gea.2015.02.008 |
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ENVELOPE(-134.272,-134.272,60.313,60.313) ENVELOPE(-134.233,-134.233,59.717,59.717) |
geographic |
Tagish Tagish Lake |
geographic_facet |
Tagish Tagish Lake |
genre |
Tagish |
genre_facet |
Tagish |
op_source |
ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://insu.hal.science/insu-01164061 Geochimica et Cosmochimica Acta, 2015, 156, pp.1-24. ⟨10.1016/j.gea.2015.02.008⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gea.2015.02.008 insu-01164061 https://insu.hal.science/insu-01164061 doi:10.1016/j.gea.2015.02.008 |
op_doi |
https://doi.org/10.1016/j.gea.2015.02.008 |
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1779320748878331904 |
spelling |
ftunilorrainehal:oai:HAL:insu-01164061v1 2023-10-09T21:56:12+02:00 Mn-Cr systematics in primitive meteorites: Insights from mineral separation and partial dissolution Göpel, Christa Birck, Jean-Louis Galy, Albert Barrat, Jean-Alix, J-A Zanda, Brigitte 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) Department of Earth Sciences Cambridge, UK University of Cambridge UK (CAM) Centre de Recherches Pétrographiques et Géochimiques (CRPG) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC) Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement IRD : UR206-Centre National de la Recherche Scientifique (CNRS) ANR-08-BLAN-0260,T-Tauri.Chem.,La Chimie du disque solaire T-Tauri(2008) 2015-05-01 https://insu.hal.science/insu-01164061 https://doi.org/10.1016/j.gea.2015.02.008 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gea.2015.02.008 insu-01164061 https://insu.hal.science/insu-01164061 doi:10.1016/j.gea.2015.02.008 ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://insu.hal.science/insu-01164061 Geochimica et Cosmochimica Acta, 2015, 156, pp.1-24. ⟨10.1016/j.gea.2015.02.008⟩ EARLY SOLAR-SYSTEM CHROMIUM ISOTOPE SYSTEMATICS UNGROUPED CARBONACEOUS CHONDRITE PARENT BODY TAGISH LAKE MN-53-CR-53 CHRONOMETRY PROTOPLANETARY DISK ALLENDE INCLUSIONS CORE FORMATION CHRONOLOGY [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2015 ftunilorrainehal https://doi.org/10.1016/j.gea.2015.02.008 2023-09-12T23:34:39Z International audience Cr isotopic compositions have been measured on carbonaceous chondrites (CC): Tafassasset, Paris, Niger I, NWA 5958, NWA 8157 and Jbilet Winselwan. In bulk samples, the Cr-54/Cr-52 ratios (expressed as epsilon Cr-54) range from 0.93 to 1.58 epsilon units. These values are in agreement with values characteristic for distinct petrologic types. Despite this 54 Cr heterogeneity, the variability in the Cr-54/Cr-52 ratios (expressed as epsilon Cr-53) of 0.2 epsilon units and the Mn/Cr ratios is consistent with the previous finding of an isochron in the Mn-Cr evolution diagram.The Mn/Cr ratio in CC corresponds to variable abundances of high-T condensate formed and separated at the beginning of the solar system, thus the canonical Mn-53/Mn-55 ratio can be defined. Based on a consistent chronology for U-Pb and Mn-Cr between the earliest objects formed in the solar nebula and the D'Orbigny angrite we define a canonical Mn-53/Mn-55 ratio and epsilon Cr-53(i) of 6.8 x 10(-6) and -0.177, respectively.The internal Mn/Cr systematics in Tafassasset and Paris were studied by two approaches: leaching technique and mineral separation. Despite variable epsilon Cr-54 values (up to >30 epsilon) linear co-variations were found between epsilon Cr-53 and Mn/Cr ratio. The mineral separates as well as the leachates of Tafassasset fall on a common isochron indicating that (1) cooling of the Tafassasset's parent body occurred at 4563.5 +/- 0.25 Ma, and that (2) Cr-54 is decoupled from the other isotopes even though temperatures >900 degrees C have been reached during metamorphism. In the case of Paris, the leachates form an alignment with a Mn-53/Mn-55 ratio higher than the canonical value. This alignment is not an isochron but rather a mixing line. Based on leachates from various CM and CI, we propose the occurrence of three distinct Cr reservoirs in meteoritic material: PURE54, HIGH53 and LOW53 characterized by a epsilon Cr-53 and epsilon Cr-54 of 0 and 25,000, -2.17 and 8, and 0.5 and -151, respectively. ... Article in Journal/Newspaper Tagish Université de Lorraine: HAL Tagish ENVELOPE(-134.272,-134.272,60.313,60.313) Tagish Lake ENVELOPE(-134.233,-134.233,59.717,59.717) |