Regional distribution and origin of polar gypsum on Mars
International audience The North Polar Cap of Mars is associated with different kinds of superficial sediments, including the Circumpolar Dune Field, interior dune fields and sedimentary veneers scattered over the ice cap. In order to resolve the mineralogical composition and the regional distributi...
Published in: | Earth and Planetary Science Letters |
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ftunivangershal:oai:HAL:hal-04309456v1 2023-12-24T10:17:31+01:00 Regional distribution and origin of polar gypsum on Mars Massé, M. Bourgeois, O. Le Mouélic, Stéphane Verpoorter, Charles Spiga, A. Deit L., Le Laboratoire de Planétologie et Géodynamique UMR 6112 (LPG) Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ) 2012 https://hal.science/hal-04309456 https://doi.org/10.1016/j.epsl.2011.11.035 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2011.11.035 hal-04309456 https://hal.science/hal-04309456 doi:10.1016/j.epsl.2011.11.035 ISSN: 0012-821X Earth and Planetary Science Letters https://hal.science/hal-04309456 Earth and Planetary Science Letters, 2012, 317-318 (february), pp.44-55. ⟨10.1016/j.epsl.2011.11.035⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2012 ftunivangershal https://doi.org/10.1016/j.epsl.2011.11.035 2023-11-29T17:17:32Z International audience The North Polar Cap of Mars is associated with different kinds of superficial sediments, including the Circumpolar Dune Field, interior dune fields and sedimentary veneers scattered over the ice cap. In order to resolve the mineralogical composition and the regional distribution of these sediments, we processed OMEGA and CRISM hyperspectral data with an original method based on spectral derivation. We find that gypsum is present in all areas where undefined hydrated minerals had been previously detected, including superficial sedimentary veneers covering the North Polar Cap, interior dune fields and the whole Circumpolar Dune Field. Morphological and structural analyses reveal that these gypsum crystals derive directly from the interior of the ice cap. The source of superficial sedimentary veneers is the dust that was previously contained in the upper part of the ice cap, the ice-rich North Polar Layered Deposits (NPLD). This gypsum-bearing dust was released, on south-facing slopes of spiral troughs and arcuate scarps, by ice ablation controlled by katabatic winds. By the analysis of all associations of erosional scarps and dune fields over the North Polar Cap, we also demonstrate that the polar dunes are composed of sand-sized particles that were previously contained in the sediment-rich Basal Unit (BU), corresponding to the lower part of the ice cap. These particles contain gypsum and were released from the BU, by regressive ablation of ice at marginal scarps that border the North Polar Cap and by vertical ablation of ice on Olympia Planum. From a reconstruction of wind streamlines over and around the ice cap, we infer that katabatic winds descending from the polar high and rotating around the North Polar Cap control the release of these gypsum-bearing particles by ice ablation and the redistribution of these particles in the Circumpolar Dune Field. © 2011 Elsevier B.V. Article in Journal/Newspaper Ice cap Portail des publications scientifiques de l’Université d’Angers (HAL) Earth and Planetary Science Letters 317-318 44 55 |
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Open Polar |
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Portail des publications scientifiques de l’Université d’Angers (HAL) |
op_collection_id |
ftunivangershal |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Massé, M. Bourgeois, O. Le Mouélic, Stéphane Verpoorter, Charles Spiga, A. Deit L., Le Regional distribution and origin of polar gypsum on Mars |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The North Polar Cap of Mars is associated with different kinds of superficial sediments, including the Circumpolar Dune Field, interior dune fields and sedimentary veneers scattered over the ice cap. In order to resolve the mineralogical composition and the regional distribution of these sediments, we processed OMEGA and CRISM hyperspectral data with an original method based on spectral derivation. We find that gypsum is present in all areas where undefined hydrated minerals had been previously detected, including superficial sedimentary veneers covering the North Polar Cap, interior dune fields and the whole Circumpolar Dune Field. Morphological and structural analyses reveal that these gypsum crystals derive directly from the interior of the ice cap. The source of superficial sedimentary veneers is the dust that was previously contained in the upper part of the ice cap, the ice-rich North Polar Layered Deposits (NPLD). This gypsum-bearing dust was released, on south-facing slopes of spiral troughs and arcuate scarps, by ice ablation controlled by katabatic winds. By the analysis of all associations of erosional scarps and dune fields over the North Polar Cap, we also demonstrate that the polar dunes are composed of sand-sized particles that were previously contained in the sediment-rich Basal Unit (BU), corresponding to the lower part of the ice cap. These particles contain gypsum and were released from the BU, by regressive ablation of ice at marginal scarps that border the North Polar Cap and by vertical ablation of ice on Olympia Planum. From a reconstruction of wind streamlines over and around the ice cap, we infer that katabatic winds descending from the polar high and rotating around the North Polar Cap control the release of these gypsum-bearing particles by ice ablation and the redistribution of these particles in the Circumpolar Dune Field. © 2011 Elsevier B.V. |
author2 |
Laboratoire de Planétologie et Géodynamique UMR 6112 (LPG) Université d'Angers (UA)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) Université de Nantes (UN)-Université de Nantes (UN)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ) |
format |
Article in Journal/Newspaper |
author |
Massé, M. Bourgeois, O. Le Mouélic, Stéphane Verpoorter, Charles Spiga, A. Deit L., Le |
author_facet |
Massé, M. Bourgeois, O. Le Mouélic, Stéphane Verpoorter, Charles Spiga, A. Deit L., Le |
author_sort |
Massé, M. |
title |
Regional distribution and origin of polar gypsum on Mars |
title_short |
Regional distribution and origin of polar gypsum on Mars |
title_full |
Regional distribution and origin of polar gypsum on Mars |
title_fullStr |
Regional distribution and origin of polar gypsum on Mars |
title_full_unstemmed |
Regional distribution and origin of polar gypsum on Mars |
title_sort |
regional distribution and origin of polar gypsum on mars |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.science/hal-04309456 https://doi.org/10.1016/j.epsl.2011.11.035 |
genre |
Ice cap |
genre_facet |
Ice cap |
op_source |
ISSN: 0012-821X Earth and Planetary Science Letters https://hal.science/hal-04309456 Earth and Planetary Science Letters, 2012, 317-318 (february), pp.44-55. ⟨10.1016/j.epsl.2011.11.035⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2011.11.035 hal-04309456 https://hal.science/hal-04309456 doi:10.1016/j.epsl.2011.11.035 |
op_doi |
https://doi.org/10.1016/j.epsl.2011.11.035 |
container_title |
Earth and Planetary Science Letters |
container_volume |
317-318 |
container_start_page |
44 |
op_container_end_page |
55 |
_version_ |
1786205708582125568 |