Oxygen isotope systematics of magnetite in hydrated Antarctic micrometeorites: new water reservoir
International audience Introduction: Secondary phases in hydrated Antarctic micrometeorites (AMMs) will show an oxygen isotopic signature from their likely formation by aque-ous processes, in either a comet or asteroid parent body. Asteroidal water may be distinguishable from cometary water in its o...
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ftuniparissaclay:oai:HAL:hal-02360861v1 2024-05-12T07:54:40+00:00 Oxygen isotope systematics of magnetite in hydrated Antarctic micrometeorites: new water reservoir Dobrica, Elena Ogliore, R, C Engrand, Cecile Nagashima, K Brearley, A. J. Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM) Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) Houston, United States 2018-03-19 https://hal.science/hal-02360861 https://hal.science/hal-02360861/document https://hal.science/hal-02360861/file/Dobrica_2018_MMs_Oiso_hydrated_Mt-LPSC.pdf en eng HAL CCSD hal-02360861 https://hal.science/hal-02360861 https://hal.science/hal-02360861/document https://hal.science/hal-02360861/file/Dobrica_2018_MMs_Oiso_hydrated_Mt-LPSC.pdf info:eu-repo/semantics/OpenAccess Lunar Planet. Sci. Lunar and Planetary Science Conference https://hal.science/hal-02360861 Lunar and Planetary Science Conference, Mar 2018, Houston, United States. pp.2666 [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/conferenceObject Conference papers 2018 ftuniparissaclay 2024-04-15T17:45:20Z International audience Introduction: Secondary phases in hydrated Antarctic micrometeorites (AMMs) will show an oxygen isotopic signature from their likely formation by aque-ous processes, in either a comet or asteroid parent body. Asteroidal water may be distinguishable from cometary water in its oxygen isotopic composition. The oxygen isotopic composition of water in asteroi-dal-derived hydrated AMMs should be close to Δ 17 O ~ 0 if their parent body is carbonaceous chondrite (CC)-like (similar to the hydrated interplanetary dust particles (IDPs) measured so far [1]) or Δ 17 O ~ +6.6‰ if their parent body is ordinary chondrite (OC)-like [e.g. 2-4]. Any hydrated AMMs with significantly different Δ 17 O values would be evidence that these particles formed from non-asteroidal water. If Jupiter-family comets (JFCs) accreted outer nebular water, the O composition of their secondary minerals could be similar to the cosmic symplectites (COSs) from Acfer 094 [5-6]. Here we present the mineralogy and oxygen isotope compositions of magnetite grains and a magnetite-dolomite assemblage that were identified in five AMMs. The purpose of these measurements is to investigate the diversity of the water reservoir from which hydrated AMMs formed and the temperature at which these minerals co-precipitated. Conference Object Antarc* Antarctic Archives ouvertes de Paris-Saclay Antarctic Jupiter ENVELOPE(101.133,101.133,-66.117,-66.117) |
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Archives ouvertes de Paris-Saclay |
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ftuniparissaclay |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
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[SDU]Sciences of the Universe [physics] Dobrica, Elena Ogliore, R, C Engrand, Cecile Nagashima, K Brearley, A. J. Oxygen isotope systematics of magnetite in hydrated Antarctic micrometeorites: new water reservoir |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience Introduction: Secondary phases in hydrated Antarctic micrometeorites (AMMs) will show an oxygen isotopic signature from their likely formation by aque-ous processes, in either a comet or asteroid parent body. Asteroidal water may be distinguishable from cometary water in its oxygen isotopic composition. The oxygen isotopic composition of water in asteroi-dal-derived hydrated AMMs should be close to Δ 17 O ~ 0 if their parent body is carbonaceous chondrite (CC)-like (similar to the hydrated interplanetary dust particles (IDPs) measured so far [1]) or Δ 17 O ~ +6.6‰ if their parent body is ordinary chondrite (OC)-like [e.g. 2-4]. Any hydrated AMMs with significantly different Δ 17 O values would be evidence that these particles formed from non-asteroidal water. If Jupiter-family comets (JFCs) accreted outer nebular water, the O composition of their secondary minerals could be similar to the cosmic symplectites (COSs) from Acfer 094 [5-6]. Here we present the mineralogy and oxygen isotope compositions of magnetite grains and a magnetite-dolomite assemblage that were identified in five AMMs. The purpose of these measurements is to investigate the diversity of the water reservoir from which hydrated AMMs formed and the temperature at which these minerals co-precipitated. |
author2 |
Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM) Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) |
format |
Conference Object |
author |
Dobrica, Elena Ogliore, R, C Engrand, Cecile Nagashima, K Brearley, A. J. |
author_facet |
Dobrica, Elena Ogliore, R, C Engrand, Cecile Nagashima, K Brearley, A. J. |
author_sort |
Dobrica, Elena |
title |
Oxygen isotope systematics of magnetite in hydrated Antarctic micrometeorites: new water reservoir |
title_short |
Oxygen isotope systematics of magnetite in hydrated Antarctic micrometeorites: new water reservoir |
title_full |
Oxygen isotope systematics of magnetite in hydrated Antarctic micrometeorites: new water reservoir |
title_fullStr |
Oxygen isotope systematics of magnetite in hydrated Antarctic micrometeorites: new water reservoir |
title_full_unstemmed |
Oxygen isotope systematics of magnetite in hydrated Antarctic micrometeorites: new water reservoir |
title_sort |
oxygen isotope systematics of magnetite in hydrated antarctic micrometeorites: new water reservoir |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.science/hal-02360861 https://hal.science/hal-02360861/document https://hal.science/hal-02360861/file/Dobrica_2018_MMs_Oiso_hydrated_Mt-LPSC.pdf |
op_coverage |
Houston, United States |
long_lat |
ENVELOPE(101.133,101.133,-66.117,-66.117) |
geographic |
Antarctic Jupiter |
geographic_facet |
Antarctic Jupiter |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Lunar Planet. Sci. Lunar and Planetary Science Conference https://hal.science/hal-02360861 Lunar and Planetary Science Conference, Mar 2018, Houston, United States. pp.2666 |
op_relation |
hal-02360861 https://hal.science/hal-02360861 https://hal.science/hal-02360861/document https://hal.science/hal-02360861/file/Dobrica_2018_MMs_Oiso_hydrated_Mt-LPSC.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1798851279348301824 |