Weathering of olivine under CO2 atmosphere A martian perspective
International audience Recent analyses from the Curiosity rover at Yellowknife Bay (Gale crater, Mars) show sedimentary rocks deposited in a lacustrine environment and containing smectite clays thought to derive from the alteration of olivine. However, little is known about the weathering processes...
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ftinstitutrsn:oai:HAL:hal-02614047v1 2024-04-28T08:41:23+00:00 Weathering of olivine under CO2 atmosphere A martian perspective Dehouck, E. Gaudin, A. Mangold, N. Lajaunie, L. Dauzères, A. Grauby, O. Le Menn, E. Laboratoire d'étude et de recherche sur les transferts et les interactions dans les sous-sols (IRSN/PSE-ENV/SEDRE/LETIS) Service des déchets radioactifs et des transferts dans la géosphère (IRSN/PSE-ENV/SEDRE) Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Institut de Radioprotection et de Sûreté Nucléaire (IRSN) Centre National dâEtudes Spatiales, CNESCentre National de la Recherche Scientifique, CNRS 2014-06-15 https://hal.science/hal-02614047 https://doi.org/10.1016/j.gca.2014.03.032 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2014.03.032 hal-02614047 https://hal.science/hal-02614047 doi:10.1016/j.gca.2014.03.032 ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://hal.science/hal-02614047 Geochimica et Cosmochimica Acta, 2014, 135, pp.170-189. ⟨10.1016/j.gca.2014.03.032⟩ [CHIM]Chemical Sciences [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2014 ftinstitutrsn https://doi.org/10.1016/j.gca.2014.03.032 2024-04-18T00:02:10Z International audience Recent analyses from the Curiosity rover at Yellowknife Bay (Gale crater, Mars) show sedimentary rocks deposited in a lacustrine environment and containing smectite clays thought to derive from the alteration of olivine. However, little is known about the weathering processes of olivine under early martian conditions, and about the stability of smectite clays in particular. Here, we present a 3-month experiment investigating the weathering of forsteritic olivine powders (Fo90) under a dense CO2 atmosphere, and under present-day terrestrial conditions for comparison. The experiment also evaluates the potential effects of hydrogen peroxide (H2O2), as a representation of the highly oxidizing compounds produced by photochemical reactions throughout martian history. The weathered samples were characterized by means of near-infrared spectroscopy (NIR), X-ray diffraction (XRD), transmission electron microscopy with energy dispersive X-ray spectrometry (TEM-EDX), Mössbauer spectroscopy and thermogravimetry. The results show that a Mg-rich smectite phase formed from the weathering of olivine under CO2 conditions, although in lower abundance than under terrestrial conditions. The main secondary phase formed under CO2 turns out to be a silica-rich phase (possibly acting as a "passivating" layer) with a non-diagnostic near-infrared spectral signature. The use of H2O2 highlights the critical importance of both the redox conditions and Fe content of the initial olivine on the nature of the secondary phases. © 2014 Elsevier Ltd. Article in Journal/Newspaper Yellowknife IRSN (Institut de Radioprotection et de Sûreté Nucléaire): Publications (HAL Geochimica et Cosmochimica Acta 135 170 189 |
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IRSN (Institut de Radioprotection et de Sûreté Nucléaire): Publications (HAL |
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ftinstitutrsn |
language |
English |
topic |
[CHIM]Chemical Sciences [SDU]Sciences of the Universe [physics] |
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[CHIM]Chemical Sciences [SDU]Sciences of the Universe [physics] Dehouck, E. Gaudin, A. Mangold, N. Lajaunie, L. Dauzères, A. Grauby, O. Le Menn, E. Weathering of olivine under CO2 atmosphere A martian perspective |
topic_facet |
[CHIM]Chemical Sciences [SDU]Sciences of the Universe [physics] |
description |
International audience Recent analyses from the Curiosity rover at Yellowknife Bay (Gale crater, Mars) show sedimentary rocks deposited in a lacustrine environment and containing smectite clays thought to derive from the alteration of olivine. However, little is known about the weathering processes of olivine under early martian conditions, and about the stability of smectite clays in particular. Here, we present a 3-month experiment investigating the weathering of forsteritic olivine powders (Fo90) under a dense CO2 atmosphere, and under present-day terrestrial conditions for comparison. The experiment also evaluates the potential effects of hydrogen peroxide (H2O2), as a representation of the highly oxidizing compounds produced by photochemical reactions throughout martian history. The weathered samples were characterized by means of near-infrared spectroscopy (NIR), X-ray diffraction (XRD), transmission electron microscopy with energy dispersive X-ray spectrometry (TEM-EDX), Mössbauer spectroscopy and thermogravimetry. The results show that a Mg-rich smectite phase formed from the weathering of olivine under CO2 conditions, although in lower abundance than under terrestrial conditions. The main secondary phase formed under CO2 turns out to be a silica-rich phase (possibly acting as a "passivating" layer) with a non-diagnostic near-infrared spectral signature. The use of H2O2 highlights the critical importance of both the redox conditions and Fe content of the initial olivine on the nature of the secondary phases. © 2014 Elsevier Ltd. |
author2 |
Laboratoire d'étude et de recherche sur les transferts et les interactions dans les sous-sols (IRSN/PSE-ENV/SEDRE/LETIS) Service des déchets radioactifs et des transferts dans la géosphère (IRSN/PSE-ENV/SEDRE) Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Institut de Radioprotection et de Sûreté Nucléaire (IRSN) Centre National dâEtudes Spatiales, CNESCentre National de la Recherche Scientifique, CNRS |
format |
Article in Journal/Newspaper |
author |
Dehouck, E. Gaudin, A. Mangold, N. Lajaunie, L. Dauzères, A. Grauby, O. Le Menn, E. |
author_facet |
Dehouck, E. Gaudin, A. Mangold, N. Lajaunie, L. Dauzères, A. Grauby, O. Le Menn, E. |
author_sort |
Dehouck, E. |
title |
Weathering of olivine under CO2 atmosphere A martian perspective |
title_short |
Weathering of olivine under CO2 atmosphere A martian perspective |
title_full |
Weathering of olivine under CO2 atmosphere A martian perspective |
title_fullStr |
Weathering of olivine under CO2 atmosphere A martian perspective |
title_full_unstemmed |
Weathering of olivine under CO2 atmosphere A martian perspective |
title_sort |
weathering of olivine under co2 atmosphere a martian perspective |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.science/hal-02614047 https://doi.org/10.1016/j.gca.2014.03.032 |
genre |
Yellowknife |
genre_facet |
Yellowknife |
op_source |
ISSN: 0016-7037 EISSN: 0016-7037 Geochimica et Cosmochimica Acta https://hal.science/hal-02614047 Geochimica et Cosmochimica Acta, 2014, 135, pp.170-189. ⟨10.1016/j.gca.2014.03.032⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gca.2014.03.032 hal-02614047 https://hal.science/hal-02614047 doi:10.1016/j.gca.2014.03.032 |
op_doi |
https://doi.org/10.1016/j.gca.2014.03.032 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
135 |
container_start_page |
170 |
op_container_end_page |
189 |
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