Geological features.
A suite of four feature types in a ∼20 km2 area near 10 ◦ N, 204 ◦ W in Athabasca Valles is interpreted to have resulted from near-surface ground ice. These features include mounds, conical forms with rimmed summit depressions, flatter irregularly-shaped forms with raised rims, and polygonal terrain...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.491.4628 2023-05-15T15:26:10+02:00 Geological features. Athabasca Valles Devon M. Burr A Richard J. Soare C Jean-michel Wan Bun Tseung Joshua P. Emery E The Pennsylvania State University CiteSeerX Archives 2004 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.491.4628 http://geoweb.gg.utk.edu/faculty/burr/pubs/05burr_etal_ic_grdice.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.491.4628 http://geoweb.gg.utk.edu/faculty/burr/pubs/05burr_etal_ic_grdice.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://geoweb.gg.utk.edu/faculty/burr/pubs/05burr_etal_ic_grdice.pdf text 2004 ftciteseerx 2016-08-14T00:03:04Z A suite of four feature types in a ∼20 km2 area near 10 ◦ N, 204 ◦ W in Athabasca Valles is interpreted to have resulted from near-surface ground ice. These features include mounds, conical forms with rimmed summit depressions, flatter irregularly-shaped forms with raised rims, and polygonal terrain. Based on morphology, size, and analogy to terrestrial ground ice forms, these Athabascan features are interpreted as pingos, collapsing pingos, pingo scars, and thermal contraction polygons, respectively. Thermal Infrared Mapping Spectrometer (THEMIS) data and geological features in the area are consistent with a sedimentary substrate underlying these features. These observations lead us to favor a ground ice interpretation, although we do not rule out volcanic and especially glaciofluvial hypotheses. The hypothesized ground ice that formed the mounds and rimmed features may have been emplaced via the deposition of saturated sediment during flooding; an alternative scenario invokes magmatically cycled groundwater. The ground ice implicit in the hypothesized thermal contraction polygons may have derived either from this flooding/ground water, or from atmospheric water vapor. The lack of obvious flood modification of the mounds and rimmed features indicates that they formed after the most recent flood inundated the area. Analogy with terrestrial pingos suggests that ground ice may be still extant within the positive relief mounds. As the water that flooded down Athabasca Valles emerged via Text Athabascan Unknown Valles ENVELOPE(-58.783,-58.783,-62.167,-62.167) |
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ftciteseerx |
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English |
description |
A suite of four feature types in a ∼20 km2 area near 10 ◦ N, 204 ◦ W in Athabasca Valles is interpreted to have resulted from near-surface ground ice. These features include mounds, conical forms with rimmed summit depressions, flatter irregularly-shaped forms with raised rims, and polygonal terrain. Based on morphology, size, and analogy to terrestrial ground ice forms, these Athabascan features are interpreted as pingos, collapsing pingos, pingo scars, and thermal contraction polygons, respectively. Thermal Infrared Mapping Spectrometer (THEMIS) data and geological features in the area are consistent with a sedimentary substrate underlying these features. These observations lead us to favor a ground ice interpretation, although we do not rule out volcanic and especially glaciofluvial hypotheses. The hypothesized ground ice that formed the mounds and rimmed features may have been emplaced via the deposition of saturated sediment during flooding; an alternative scenario invokes magmatically cycled groundwater. The ground ice implicit in the hypothesized thermal contraction polygons may have derived either from this flooding/ground water, or from atmospheric water vapor. The lack of obvious flood modification of the mounds and rimmed features indicates that they formed after the most recent flood inundated the area. Analogy with terrestrial pingos suggests that ground ice may be still extant within the positive relief mounds. As the water that flooded down Athabasca Valles emerged via |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Athabasca Valles Devon M. Burr A Richard J. Soare C Jean-michel Wan Bun Tseung Joshua P. Emery E |
spellingShingle |
Athabasca Valles Devon M. Burr A Richard J. Soare C Jean-michel Wan Bun Tseung Joshua P. Emery E Geological features. |
author_facet |
Athabasca Valles Devon M. Burr A Richard J. Soare C Jean-michel Wan Bun Tseung Joshua P. Emery E |
author_sort |
Athabasca Valles |
title |
Geological features. |
title_short |
Geological features. |
title_full |
Geological features. |
title_fullStr |
Geological features. |
title_full_unstemmed |
Geological features. |
title_sort |
geological features. |
publishDate |
2004 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.491.4628 http://geoweb.gg.utk.edu/faculty/burr/pubs/05burr_etal_ic_grdice.pdf |
long_lat |
ENVELOPE(-58.783,-58.783,-62.167,-62.167) |
geographic |
Valles |
geographic_facet |
Valles |
genre |
Athabascan |
genre_facet |
Athabascan |
op_source |
http://geoweb.gg.utk.edu/faculty/burr/pubs/05burr_etal_ic_grdice.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.491.4628 http://geoweb.gg.utk.edu/faculty/burr/pubs/05burr_etal_ic_grdice.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766356707204661248 |