Chasma Australe, Mars: Structural Framework for a Catastrophic Outflow Origin
Chasma Australe, 500 km long and up to 80 km wide, is the most remarkable of the martian south pole erosional reentrants carved in the polar layered deposits. We have interpreted Chasma Australe erosional and depositional features as evidence for a flood origin, which we have reconstructed using a m...
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ftunivcmadrid:oai:www.ucm.es:25615 2023-05-15T18:22:11+02:00 Chasma Australe, Mars: Structural Framework for a Catastrophic Outflow Origin Anguita, Francisco Babín Vich, Rosa Blanca Benito, Gerardo Gómez Ortiz, David Collado, Ana Rice, James W. 2000 application/pdf https://eprints.ucm.es/id/eprint/25615/ https://eprints.ucm.es/id/eprint/25615/1/1-s2.0-S0019103599962942-01.pdf http://www.journals.elsevier.com/icarus/ https://doi.org/10.1006/icar.1999.6294 en eng Elsevier Science B.V., Amsterdam https://eprints.ucm.es/id/eprint/25615/1/1-s2.0-S0019103599962942-01.pdf info:eu-repo/semantics/openAccess Geología info:eu-repo/semantics/article PeerReviewed 2000 ftunivcmadrid https://doi.org/10.1006/icar.1999.6294 2022-05-12T19:56:37Z Chasma Australe, 500 km long and up to 80 km wide, is the most remarkable of the martian south pole erosional reentrants carved in the polar layered deposits. We have interpreted Chasma Australe erosional and depositional features as evidence for a flood origin, which we have reconstructed using a modified Manning equation. The main characteristics of the flow are a water velocity between 30 and 50 m s¡1 and discharge values between 7 x 10^8 and 3 x 10^9 m3 s-1, very near to MGS data-based estimations for martian outflow channels (D. E. Smith et al. 1998, Science 279, 1686–1692). We thus postulate that Chasma Australe originated in a catastrophic flood. The tectonic study of an area (roughly 20 million km2 in size) around Mars’ south pole included the measurement and projection in rose diagrams of more than 300 lineaments, of which 85 were wrinkle ridges and the rest straight scarps. The whole set of lineaments can be explained by a stress field with a d1 N10ºE in strike, the wrinkle ridges being reverse faults and the other lineaments direct and strike-slip faults. The straight layout of parts of Chasma Australe almost 200 km long suggests that the chasma was carved following a fracture network. The effectiveness of the erosional process (the canyon is up to 1000 m deep) leads us to suspect that this carving was preceded by a sapping period. Endogenetic and exogenetic processes would thus have contributed to the origin of this landform Article in Journal/Newspaper South pole Universidad Complutense de Madrid (UCM): E-Prints Complutense South Pole Icarus 144 2 302 312 |
institution |
Open Polar |
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Universidad Complutense de Madrid (UCM): E-Prints Complutense |
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ftunivcmadrid |
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English |
topic |
Geología |
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Geología Anguita, Francisco Babín Vich, Rosa Blanca Benito, Gerardo Gómez Ortiz, David Collado, Ana Rice, James W. Chasma Australe, Mars: Structural Framework for a Catastrophic Outflow Origin |
topic_facet |
Geología |
description |
Chasma Australe, 500 km long and up to 80 km wide, is the most remarkable of the martian south pole erosional reentrants carved in the polar layered deposits. We have interpreted Chasma Australe erosional and depositional features as evidence for a flood origin, which we have reconstructed using a modified Manning equation. The main characteristics of the flow are a water velocity between 30 and 50 m s¡1 and discharge values between 7 x 10^8 and 3 x 10^9 m3 s-1, very near to MGS data-based estimations for martian outflow channels (D. E. Smith et al. 1998, Science 279, 1686–1692). We thus postulate that Chasma Australe originated in a catastrophic flood. The tectonic study of an area (roughly 20 million km2 in size) around Mars’ south pole included the measurement and projection in rose diagrams of more than 300 lineaments, of which 85 were wrinkle ridges and the rest straight scarps. The whole set of lineaments can be explained by a stress field with a d1 N10ºE in strike, the wrinkle ridges being reverse faults and the other lineaments direct and strike-slip faults. The straight layout of parts of Chasma Australe almost 200 km long suggests that the chasma was carved following a fracture network. The effectiveness of the erosional process (the canyon is up to 1000 m deep) leads us to suspect that this carving was preceded by a sapping period. Endogenetic and exogenetic processes would thus have contributed to the origin of this landform |
format |
Article in Journal/Newspaper |
author |
Anguita, Francisco Babín Vich, Rosa Blanca Benito, Gerardo Gómez Ortiz, David Collado, Ana Rice, James W. |
author_facet |
Anguita, Francisco Babín Vich, Rosa Blanca Benito, Gerardo Gómez Ortiz, David Collado, Ana Rice, James W. |
author_sort |
Anguita, Francisco |
title |
Chasma Australe, Mars: Structural Framework for a Catastrophic Outflow Origin |
title_short |
Chasma Australe, Mars: Structural Framework for a Catastrophic Outflow Origin |
title_full |
Chasma Australe, Mars: Structural Framework for a Catastrophic Outflow Origin |
title_fullStr |
Chasma Australe, Mars: Structural Framework for a Catastrophic Outflow Origin |
title_full_unstemmed |
Chasma Australe, Mars: Structural Framework for a Catastrophic Outflow Origin |
title_sort |
chasma australe, mars: structural framework for a catastrophic outflow origin |
publisher |
Elsevier Science B.V., Amsterdam |
publishDate |
2000 |
url |
https://eprints.ucm.es/id/eprint/25615/ https://eprints.ucm.es/id/eprint/25615/1/1-s2.0-S0019103599962942-01.pdf http://www.journals.elsevier.com/icarus/ https://doi.org/10.1006/icar.1999.6294 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://eprints.ucm.es/id/eprint/25615/1/1-s2.0-S0019103599962942-01.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1006/icar.1999.6294 |
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Icarus |
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144 |
container_issue |
2 |
container_start_page |
302 |
op_container_end_page |
312 |
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1766201551678865408 |