The structural evolution of George VI sound, Antarctic Peninsula
George VI Sound, 400 km long and between 25 and 90 km wide, separates Alexander Island from the Antarctic Peninsula. The straight parallel sides of its northern section and sub-parallel normal faulting observed in exposed rock on adjacent parts of Alexander Island and Palmer Land indicate a history...
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ftnerc:oai:nora.nerc.ac.uk:523310 2023-05-15T13:15:15+02:00 The structural evolution of George VI sound, Antarctic Peninsula Crabtree, R.D. Storey, B.C. Doake, C.S.M. 1985 http://nora.nerc.ac.uk/id/eprint/523310/ https://doi.org/10.1016/0040-1951(85)90025-3 unknown Elsevier Crabtree, R.D.; Storey, B.C.; Doake, C.S.M. 1985 The structural evolution of George VI sound, Antarctic Peninsula. Tectonophysics, 114 (1-4). 431-442. https://doi.org/10.1016/0040-1951(85)90025-3 <https://doi.org/10.1016/0040-1951(85)90025-3> Earth Sciences Publication - Article PeerReviewed 1985 ftnerc https://doi.org/10.1016/0040-1951(85)90025-3 2023-02-04T19:48:22Z George VI Sound, 400 km long and between 25 and 90 km wide, separates Alexander Island from the Antarctic Peninsula. The straight parallel sides of its northern section and sub-parallel normal faulting observed in exposed rock on adjacent parts of Alexander Island and Palmer Land indicate a history of rifting. Subglacial topography, revealed through radar sounding of ice thickness in Palmer Land, shows deep areas which owe their presence to two major fault zones parallel to the main N-S trend. One of these is probably the western escarpment of the Palmer Land plateau and the eastern boundary of the rift system. Bedrock relief suggests that transverse block faulting has differentially raised and lowered the mountains on the eastern side of the sound. A seismic profile through George VI Ice Shelf (which occupies most of George VI Sound) confirms that the “W”-shaped cross-section of the bedrock observed by plumb-line at the northern edge of the ice shelf is also found 250 km further south. The shape may be due entirely to glacial erosion, but it is more likely to be a structural feature subsequently glacially modified. These features are consistent with a model of George VI Sound as a region of Tertiary intra-arc extension within the Mesozoic and Cenozoic magmatic arc of the Antarctic Peninsula and Alexander Island. Article in Journal/Newspaper Alexander Island Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf Ice Shelf Palmer Land Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula Alexander Island ENVELOPE(-69.895,-69.895,-71.287,-71.287) Palmer Land ENVELOPE(-65.000,-65.000,-71.500,-71.500) George VI Ice Shelf ENVELOPE(-67.840,-67.840,-71.692,-71.692) George VI Sound ENVELOPE(-68.000,-68.000,-71.000,-71.000) Tectonophysics 114 1-4 431 442 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Crabtree, R.D. Storey, B.C. Doake, C.S.M. The structural evolution of George VI sound, Antarctic Peninsula |
topic_facet |
Earth Sciences |
description |
George VI Sound, 400 km long and between 25 and 90 km wide, separates Alexander Island from the Antarctic Peninsula. The straight parallel sides of its northern section and sub-parallel normal faulting observed in exposed rock on adjacent parts of Alexander Island and Palmer Land indicate a history of rifting. Subglacial topography, revealed through radar sounding of ice thickness in Palmer Land, shows deep areas which owe their presence to two major fault zones parallel to the main N-S trend. One of these is probably the western escarpment of the Palmer Land plateau and the eastern boundary of the rift system. Bedrock relief suggests that transverse block faulting has differentially raised and lowered the mountains on the eastern side of the sound. A seismic profile through George VI Ice Shelf (which occupies most of George VI Sound) confirms that the “W”-shaped cross-section of the bedrock observed by plumb-line at the northern edge of the ice shelf is also found 250 km further south. The shape may be due entirely to glacial erosion, but it is more likely to be a structural feature subsequently glacially modified. These features are consistent with a model of George VI Sound as a region of Tertiary intra-arc extension within the Mesozoic and Cenozoic magmatic arc of the Antarctic Peninsula and Alexander Island. |
format |
Article in Journal/Newspaper |
author |
Crabtree, R.D. Storey, B.C. Doake, C.S.M. |
author_facet |
Crabtree, R.D. Storey, B.C. Doake, C.S.M. |
author_sort |
Crabtree, R.D. |
title |
The structural evolution of George VI sound, Antarctic Peninsula |
title_short |
The structural evolution of George VI sound, Antarctic Peninsula |
title_full |
The structural evolution of George VI sound, Antarctic Peninsula |
title_fullStr |
The structural evolution of George VI sound, Antarctic Peninsula |
title_full_unstemmed |
The structural evolution of George VI sound, Antarctic Peninsula |
title_sort |
structural evolution of george vi sound, antarctic peninsula |
publisher |
Elsevier |
publishDate |
1985 |
url |
http://nora.nerc.ac.uk/id/eprint/523310/ https://doi.org/10.1016/0040-1951(85)90025-3 |
long_lat |
ENVELOPE(-69.895,-69.895,-71.287,-71.287) ENVELOPE(-65.000,-65.000,-71.500,-71.500) ENVELOPE(-67.840,-67.840,-71.692,-71.692) ENVELOPE(-68.000,-68.000,-71.000,-71.000) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Alexander Island Palmer Land George VI Ice Shelf George VI Sound |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Alexander Island Palmer Land George VI Ice Shelf George VI Sound |
genre |
Alexander Island Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf Ice Shelf Palmer Land |
genre_facet |
Alexander Island Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf Ice Shelf Palmer Land |
op_relation |
Crabtree, R.D.; Storey, B.C.; Doake, C.S.M. 1985 The structural evolution of George VI sound, Antarctic Peninsula. Tectonophysics, 114 (1-4). 431-442. https://doi.org/10.1016/0040-1951(85)90025-3 <https://doi.org/10.1016/0040-1951(85)90025-3> |
op_doi |
https://doi.org/10.1016/0040-1951(85)90025-3 |
container_title |
Tectonophysics |
container_volume |
114 |
container_issue |
1-4 |
container_start_page |
431 |
op_container_end_page |
442 |
_version_ |
1766267717614043136 |