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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ftcsic:oai:digital.csic.es:10261/12956 2024-02-11T10:08:40+01:00 Chasma Australe, Mars: Structural framework for a catastrophic outflow origin. Anguita, F. Babín, R. Benito, Gerardo Gómez, D. Collado, Ana Rice, Rebeca J. 2000-04 579917 bytes image/jpeg http://hdl.handle.net/10261/12956 https://doi.org/10.1006/icar.1999.6294 en eng Academic Press http://dx.doi.org/10.1006/icar.1999.6294 Icarus 144: 302–312 (2000) 0019-1035 http://hdl.handle.net/10261/12956 doi:10.1006/icar.1999.6294 none Mars Tectonics Climate Poles artículo http://purl.org/coar/resource_type/c_6501 2000 ftcsic https://doi.org/10.1006/icar.1999.6294 2024-01-16T09:22:31Z 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 × 108 and 3 × 109 m3 s−1, very near to MGS data-based estimations for martian outflow channels (D. E. Smith et al. 1998, Science279, 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 canbe explained by a stress field with a σ1 N10°E 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. Two of the authors (F.A. and G.B.) were supported by Grant APC 1997-0046 of CICYT, Spain. Peer reviewed Article in Journal/Newspaper South pole Digital.CSIC (Spanish National Research Council) South Pole Icarus 144 2 302 312 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Mars Tectonics Climate Poles |
spellingShingle |
Mars Tectonics Climate Poles Anguita, F. Babín, R. Benito, Gerardo Gómez, D. Collado, Ana Rice, Rebeca J. Chasma Australe, Mars: Structural framework for a catastrophic outflow origin. |
topic_facet |
Mars Tectonics Climate Poles |
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 × 108 and 3 × 109 m3 s−1, very near to MGS data-based estimations for martian outflow channels (D. E. Smith et al. 1998, Science279, 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 canbe explained by a stress field with a σ1 N10°E 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. Two of the authors (F.A. and G.B.) were supported by Grant APC 1997-0046 of CICYT, Spain. Peer reviewed |
format |
Article in Journal/Newspaper |
author |
Anguita, F. Babín, R. Benito, Gerardo Gómez, D. Collado, Ana Rice, Rebeca J. |
author_facet |
Anguita, F. Babín, R. Benito, Gerardo Gómez, D. Collado, Ana Rice, Rebeca J. |
author_sort |
Anguita, F. |
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 |
Academic Press |
publishDate |
2000 |
url |
http://hdl.handle.net/10261/12956 https://doi.org/10.1006/icar.1999.6294 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
http://dx.doi.org/10.1006/icar.1999.6294 Icarus 144: 302–312 (2000) 0019-1035 http://hdl.handle.net/10261/12956 doi:10.1006/icar.1999.6294 |
op_rights |
none |
op_doi |
https://doi.org/10.1006/icar.1999.6294 |
container_title |
Icarus |
container_volume |
144 |
container_issue |
2 |
container_start_page |
302 |
op_container_end_page |
312 |
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1790608192598704128 |