Geophysical and geomorphological investigations of polygonal patterned ground in continuous antarctic permafrost as a Mars analog
The results of a combined geophysical and geomorphological investigation of thermal-contraction-crack polygons in Northern Victoria Land (Antarctica) are reported. An area of ~30,000 m2 characterized by random orthogonal polygons was investigated using 10 GPR and 2 ERT surveys. The terrain consists...
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Schilling Hoyle A.
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ftunivromairis:oai:iris.uniroma1.it:11573/1426378 2024-04-21T07:50:24+00:00 Geophysical and geomorphological investigations of polygonal patterned ground in continuous antarctic permafrost as a Mars analog Emanuele Forte Rossana Raffi Hugh French Mauro Guglielmin A. Schilling Hoyle Forte, Emanuele Raffi, Rossana French, Hugh Guglielmin, Mauro 2018 http://hdl.handle.net/11573/1426378 eng eng Schilling Hoyle A. place:Davos info:eu-repo/semantics/altIdentifier/isbn/978-0-948277-54-2 ispartofbook:Polar 2018 abstract proceedings 8th Open Science Conference XXXV SCAR firstpage:872 lastpage:872 numberofpages:1 http://hdl.handle.net/11573/1426378 polygon thermal contraction crack ice wedges info:eu-repo/semantics/conferenceObject 2018 ftunivromairis 2024-03-28T02:09:17Z The results of a combined geophysical and geomorphological investigation of thermal-contraction-crack polygons in Northern Victoria Land (Antarctica) are reported. An area of ~30,000 m2 characterized by random orthogonal polygons was investigated using 10 GPR and 2 ERT surveys. The terrain consists of Holocene-age raised beaches. The polygons are well developed only on beaches that are >14 m above current sea level. Uplift curves for the region suggest the beaches formed between 4.2 and 6.3 ka BP. Sections were excavated through two of the fissures that form the polygons. There was good correlation between field observations and GPR (250 Mhz) data. It is concluded that the polygons are composite in nature because the shallow linear depressions that outline the polygons are underlain by fissures that can contain both sandy gravel (i.e., sand wedges) and foliated gravelly ice (i.e., ice wedges) in the same polygon network. Generally, the ice infill is less common than the sandy gravel infill. While thermal-contraction-cracking is the principle mechanism for polygon formation, it is suggested that local micro-site conditions, mainly snow distribution, leads to the different type of fissure infill Conference Object Antarc* Antarctic Antarctica Ice permafrost Victoria Land wedge* Sapienza Università di Roma: CINECA IRIS |
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Open Polar |
collection |
Sapienza Università di Roma: CINECA IRIS |
op_collection_id |
ftunivromairis |
language |
English |
topic |
polygon thermal contraction crack ice wedges |
spellingShingle |
polygon thermal contraction crack ice wedges Emanuele Forte Rossana Raffi Hugh French Mauro Guglielmin Geophysical and geomorphological investigations of polygonal patterned ground in continuous antarctic permafrost as a Mars analog |
topic_facet |
polygon thermal contraction crack ice wedges |
description |
The results of a combined geophysical and geomorphological investigation of thermal-contraction-crack polygons in Northern Victoria Land (Antarctica) are reported. An area of ~30,000 m2 characterized by random orthogonal polygons was investigated using 10 GPR and 2 ERT surveys. The terrain consists of Holocene-age raised beaches. The polygons are well developed only on beaches that are >14 m above current sea level. Uplift curves for the region suggest the beaches formed between 4.2 and 6.3 ka BP. Sections were excavated through two of the fissures that form the polygons. There was good correlation between field observations and GPR (250 Mhz) data. It is concluded that the polygons are composite in nature because the shallow linear depressions that outline the polygons are underlain by fissures that can contain both sandy gravel (i.e., sand wedges) and foliated gravelly ice (i.e., ice wedges) in the same polygon network. Generally, the ice infill is less common than the sandy gravel infill. While thermal-contraction-cracking is the principle mechanism for polygon formation, it is suggested that local micro-site conditions, mainly snow distribution, leads to the different type of fissure infill |
author2 |
A. Schilling Hoyle Forte, Emanuele Raffi, Rossana French, Hugh Guglielmin, Mauro |
format |
Conference Object |
author |
Emanuele Forte Rossana Raffi Hugh French Mauro Guglielmin |
author_facet |
Emanuele Forte Rossana Raffi Hugh French Mauro Guglielmin |
author_sort |
Emanuele Forte |
title |
Geophysical and geomorphological investigations of polygonal patterned ground in continuous antarctic permafrost as a Mars analog |
title_short |
Geophysical and geomorphological investigations of polygonal patterned ground in continuous antarctic permafrost as a Mars analog |
title_full |
Geophysical and geomorphological investigations of polygonal patterned ground in continuous antarctic permafrost as a Mars analog |
title_fullStr |
Geophysical and geomorphological investigations of polygonal patterned ground in continuous antarctic permafrost as a Mars analog |
title_full_unstemmed |
Geophysical and geomorphological investigations of polygonal patterned ground in continuous antarctic permafrost as a Mars analog |
title_sort |
geophysical and geomorphological investigations of polygonal patterned ground in continuous antarctic permafrost as a mars analog |
publisher |
Schilling Hoyle A. |
publishDate |
2018 |
url |
http://hdl.handle.net/11573/1426378 |
genre |
Antarc* Antarctic Antarctica Ice permafrost Victoria Land wedge* |
genre_facet |
Antarc* Antarctic Antarctica Ice permafrost Victoria Land wedge* |
op_relation |
info:eu-repo/semantics/altIdentifier/isbn/978-0-948277-54-2 ispartofbook:Polar 2018 abstract proceedings 8th Open Science Conference XXXV SCAR firstpage:872 lastpage:872 numberofpages:1 http://hdl.handle.net/11573/1426378 |
_version_ |
1796934144513540096 |