Ice sheet surface lineaments as nonconventional indicators of East Antarctica bedrock tectonics
A recent focus of major international exploration in East Antarctica has been aimed at revealing its bedrock topography and imaging its tectonic architecture and evolution. Here we present the tectonic interpretation of regional-scale lineaments revealed by the Radarsat mosaic of Antarctica on the i...
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Online Access: | https://hdl.handle.net/11567/988401 https://doi.org/10.1130/GES01074.1 |
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ftunivgenova:oai:iris.unige.it:11567/988401 2024-04-14T08:03:30+00:00 Ice sheet surface lineaments as nonconventional indicators of East Antarctica bedrock tectonics CIANFARRA, Paola SALVINI, Francesco Cianfarra, Paola Salvini, Francesco 2014 ELETTRONICO https://hdl.handle.net/11567/988401 https://doi.org/10.1130/GES01074.1 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000346752400019 volume:10 firstpage:1411 lastpage:1418 numberofpages:8 journal:GEOSPHERE https://hdl.handle.net/11567/988401 doi:10.1130/GES01074.1 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84920151856 info:eu-repo/semantics/article 2014 ftunivgenova https://doi.org/10.1130/GES01074.1 2024-03-21T02:31:55Z A recent focus of major international exploration in East Antarctica has been aimed at revealing its bedrock topography and imaging its tectonic architecture and evolution. Here we present the tectonic interpretation of regional-scale lineaments revealed by the Radarsat mosaic of Antarctica on the ice sheet surface in the Vostok–Dome C– Adventure Basin region. These lineaments appear in the radar backscatter textures as alignments of marked tonal variations with lengths of tens to hundreds of kilometers and were identifi ed using an automated methodology. We explore the origin scenarios for the ice sheet surface lineaments by comparing their azimuthal trends and spatial distribution with the main morphotectonic features of the bedrock. Azimuthal analysis reveals that lineaments cluster around two preferential directions interpreted as structural or tectonic domains. These show strong correlations with azimuths of tectonic fabrics in the bedrock. The main lineament domain parallels the morphotectonic features of the study area, namely the Adventure Basin and the Concordia and Aurora Trenches. The second lineament set corresponds to the mean orientation of the Lake Vostok depression. The spatial analyses of the two lineament domains strengthen our fi ndings and interpretations. Comparisons with wind and ice fl ow directions exclude their infl uence on the identifi ed lineament pattern. Results reveal the tectonic origin of the lineament domains, and demonstrate the method’s usefulness as a tool for tectonic studies of regions characterized by thick covers. These regions include other areas of the East Antarctic craton such as the Gamburtsev Subglacial Mountains, as well as deserts or surfaces of other planets. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Università degli Studi di Genova: CINECA IRIS Antarctic East Antarctica Lake Vostok ENVELOPE(106.000,106.000,-77.500,-77.500) Gamburtsev Subglacial Mountains ENVELOPE(76.000,76.000,-80.500,-80.500) Geosphere 10 6 1411 1418 |
institution |
Open Polar |
collection |
Università degli Studi di Genova: CINECA IRIS |
op_collection_id |
ftunivgenova |
language |
English |
description |
A recent focus of major international exploration in East Antarctica has been aimed at revealing its bedrock topography and imaging its tectonic architecture and evolution. Here we present the tectonic interpretation of regional-scale lineaments revealed by the Radarsat mosaic of Antarctica on the ice sheet surface in the Vostok–Dome C– Adventure Basin region. These lineaments appear in the radar backscatter textures as alignments of marked tonal variations with lengths of tens to hundreds of kilometers and were identifi ed using an automated methodology. We explore the origin scenarios for the ice sheet surface lineaments by comparing their azimuthal trends and spatial distribution with the main morphotectonic features of the bedrock. Azimuthal analysis reveals that lineaments cluster around two preferential directions interpreted as structural or tectonic domains. These show strong correlations with azimuths of tectonic fabrics in the bedrock. The main lineament domain parallels the morphotectonic features of the study area, namely the Adventure Basin and the Concordia and Aurora Trenches. The second lineament set corresponds to the mean orientation of the Lake Vostok depression. The spatial analyses of the two lineament domains strengthen our fi ndings and interpretations. Comparisons with wind and ice fl ow directions exclude their infl uence on the identifi ed lineament pattern. Results reveal the tectonic origin of the lineament domains, and demonstrate the method’s usefulness as a tool for tectonic studies of regions characterized by thick covers. These regions include other areas of the East Antarctic craton such as the Gamburtsev Subglacial Mountains, as well as deserts or surfaces of other planets. |
author2 |
Cianfarra, Paola Salvini, Francesco |
format |
Article in Journal/Newspaper |
author |
CIANFARRA, Paola SALVINI, Francesco |
spellingShingle |
CIANFARRA, Paola SALVINI, Francesco Ice sheet surface lineaments as nonconventional indicators of East Antarctica bedrock tectonics |
author_facet |
CIANFARRA, Paola SALVINI, Francesco |
author_sort |
CIANFARRA, Paola |
title |
Ice sheet surface lineaments as nonconventional indicators of East Antarctica bedrock tectonics |
title_short |
Ice sheet surface lineaments as nonconventional indicators of East Antarctica bedrock tectonics |
title_full |
Ice sheet surface lineaments as nonconventional indicators of East Antarctica bedrock tectonics |
title_fullStr |
Ice sheet surface lineaments as nonconventional indicators of East Antarctica bedrock tectonics |
title_full_unstemmed |
Ice sheet surface lineaments as nonconventional indicators of East Antarctica bedrock tectonics |
title_sort |
ice sheet surface lineaments as nonconventional indicators of east antarctica bedrock tectonics |
publishDate |
2014 |
url |
https://hdl.handle.net/11567/988401 https://doi.org/10.1130/GES01074.1 |
long_lat |
ENVELOPE(106.000,106.000,-77.500,-77.500) ENVELOPE(76.000,76.000,-80.500,-80.500) |
geographic |
Antarctic East Antarctica Lake Vostok Gamburtsev Subglacial Mountains |
geographic_facet |
Antarctic East Antarctica Lake Vostok Gamburtsev Subglacial Mountains |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000346752400019 volume:10 firstpage:1411 lastpage:1418 numberofpages:8 journal:GEOSPHERE https://hdl.handle.net/11567/988401 doi:10.1130/GES01074.1 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84920151856 |
op_doi |
https://doi.org/10.1130/GES01074.1 |
container_title |
Geosphere |
container_volume |
10 |
container_issue |
6 |
container_start_page |
1411 |
op_container_end_page |
1418 |
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1796299767018422272 |