Implications of large elastic thicknesses for the composition and current thermal state of Mars
International audience The Martian elastic lithosphere thickness has recently been constrained by modeling the geodynamical response to loading at the Martian polar caps and was found to exceed 300 km at the north pole today. Geological evidence suggests that Mars has been volcanically active in the...
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ftccsdartic:oai:HAL:hal-00533502v1 2023-05-15T17:39:57+02:00 Implications of large elastic thicknesses for the composition and current thermal state of Mars Grott, M. Breuer, D. 2009-05-07 https://hal.archives-ouvertes.fr/hal-00533502 https://hal.archives-ouvertes.fr/hal-00533502/document https://hal.archives-ouvertes.fr/hal-00533502/file/PEER_stage2_10.1016%252Fj.icarus.2009.01.020.pdf https://doi.org/10.1016/j.icarus.2009.01.020 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.icarus.2009.01.020 hal-00533502 https://hal.archives-ouvertes.fr/hal-00533502 https://hal.archives-ouvertes.fr/hal-00533502/document https://hal.archives-ouvertes.fr/hal-00533502/file/PEER_stage2_10.1016%252Fj.icarus.2009.01.020.pdf doi:10.1016/j.icarus.2009.01.020 info:eu-repo/semantics/OpenAccess ISSN: 0019-1035 EISSN: 1090-2643 Icarus https://hal.archives-ouvertes.fr/hal-00533502 Icarus, Elsevier, 2009, 201 (2), pp.540. ⟨10.1016/j.icarus.2009.01.020⟩ Mars Mars interior Thermal histories Geophysics info:eu-repo/semantics/article Journal articles 2009 ftccsdartic https://doi.org/10.1016/j.icarus.2009.01.020 2020-12-26T06:55:14Z International audience The Martian elastic lithosphere thickness has recently been constrained by modeling the geodynamical response to loading at the Martian polar caps and was found to exceed 300 km at the north pole today. Geological evidence suggests that Mars has been volcanically active in the recent past and we have reinvestigated the Martian thermal evolution, identifying models which are consistent with and the observed recent magmatic activity. We find that although models satisfying both constraints can be constructed, special assumptions regarding the concentration and distribution of radioactive elements, the style of mantle convection and/or the mantle's volatile content need to be made. If a dry mantle rheology is assumed, strong plumes caused by, e.g., a strongly pressure dependent mantle viscosity or endothermic phase transitions near the core-mantle boundary are required to allow for decompression melting in the heads of mantle plumes. For a wet mantle, large mantle water contents of the order of 1000 ppm are required to allow for partial mantle melting. Also, for a moderate crustal enrichment of heat producing, elements the planet's bulk composition needs to be 25% and 50% sub-chondritic for dry and wet mantle rheologies, respectively. Even then, models resulting in a globally averaged elastic thicknesses of are difficult to reconcile with most elastic thickness estimates available for the Hesperian and Amazonian periods. It therefore seems likely that large elastic thicknesses in excess of 300 km are not representative for the bulk of the planet and that possibly shows a large degree of spatial heterogeneity. Article in Journal/Newspaper North Pole Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) North Pole Icarus 201 2 540 548 |
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Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
Mars Mars interior Thermal histories Geophysics |
spellingShingle |
Mars Mars interior Thermal histories Geophysics Grott, M. Breuer, D. Implications of large elastic thicknesses for the composition and current thermal state of Mars |
topic_facet |
Mars Mars interior Thermal histories Geophysics |
description |
International audience The Martian elastic lithosphere thickness has recently been constrained by modeling the geodynamical response to loading at the Martian polar caps and was found to exceed 300 km at the north pole today. Geological evidence suggests that Mars has been volcanically active in the recent past and we have reinvestigated the Martian thermal evolution, identifying models which are consistent with and the observed recent magmatic activity. We find that although models satisfying both constraints can be constructed, special assumptions regarding the concentration and distribution of radioactive elements, the style of mantle convection and/or the mantle's volatile content need to be made. If a dry mantle rheology is assumed, strong plumes caused by, e.g., a strongly pressure dependent mantle viscosity or endothermic phase transitions near the core-mantle boundary are required to allow for decompression melting in the heads of mantle plumes. For a wet mantle, large mantle water contents of the order of 1000 ppm are required to allow for partial mantle melting. Also, for a moderate crustal enrichment of heat producing, elements the planet's bulk composition needs to be 25% and 50% sub-chondritic for dry and wet mantle rheologies, respectively. Even then, models resulting in a globally averaged elastic thicknesses of are difficult to reconcile with most elastic thickness estimates available for the Hesperian and Amazonian periods. It therefore seems likely that large elastic thicknesses in excess of 300 km are not representative for the bulk of the planet and that possibly shows a large degree of spatial heterogeneity. |
format |
Article in Journal/Newspaper |
author |
Grott, M. Breuer, D. |
author_facet |
Grott, M. Breuer, D. |
author_sort |
Grott, M. |
title |
Implications of large elastic thicknesses for the composition and current thermal state of Mars |
title_short |
Implications of large elastic thicknesses for the composition and current thermal state of Mars |
title_full |
Implications of large elastic thicknesses for the composition and current thermal state of Mars |
title_fullStr |
Implications of large elastic thicknesses for the composition and current thermal state of Mars |
title_full_unstemmed |
Implications of large elastic thicknesses for the composition and current thermal state of Mars |
title_sort |
implications of large elastic thicknesses for the composition and current thermal state of mars |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.archives-ouvertes.fr/hal-00533502 https://hal.archives-ouvertes.fr/hal-00533502/document https://hal.archives-ouvertes.fr/hal-00533502/file/PEER_stage2_10.1016%252Fj.icarus.2009.01.020.pdf https://doi.org/10.1016/j.icarus.2009.01.020 |
geographic |
North Pole |
geographic_facet |
North Pole |
genre |
North Pole |
genre_facet |
North Pole |
op_source |
ISSN: 0019-1035 EISSN: 1090-2643 Icarus https://hal.archives-ouvertes.fr/hal-00533502 Icarus, Elsevier, 2009, 201 (2), pp.540. ⟨10.1016/j.icarus.2009.01.020⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.icarus.2009.01.020 hal-00533502 https://hal.archives-ouvertes.fr/hal-00533502 https://hal.archives-ouvertes.fr/hal-00533502/document https://hal.archives-ouvertes.fr/hal-00533502/file/PEER_stage2_10.1016%252Fj.icarus.2009.01.020.pdf doi:10.1016/j.icarus.2009.01.020 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.icarus.2009.01.020 |
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201 |
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