Paleomagnetic study of Deception Island, South Shetland Islands, Antarctica
A paleomagnetic study was carried out on recent volcanic rocks exposed on Deception Island (63.0°S, 60.6°W), Antarctica. Sampling comprised all stratigraphic units exposed on the island, which include basaltic, andesitic and trachytic lavas, basaltic dykes and pyroclastic flows. Following stepwise t...
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fthighwire:oai:open-archive.highwire.org:gji:153/2/333 2023-05-15T13:48:23+02:00 Paleomagnetic study of Deception Island, South Shetland Islands, Antarctica Baraldo, Andrés Rapalini, Augusto E. Böhnel, Harald Mena, Mabel 2003-05-01 00:00:00.0 text/html http://gji.oxfordjournals.org/cgi/content/short/153/2/333 https://doi.org/10.1046/j.1365-246X.2003.01881.x en eng Oxford University Press http://gji.oxfordjournals.org/cgi/content/short/153/2/333 http://dx.doi.org/10.1046/j.1365-246X.2003.01881.x Copyright (C) 2003, Oxford University Press Research Papers TEXT 2003 fthighwire https://doi.org/10.1046/j.1365-246X.2003.01881.x 2013-05-26T23:22:58Z A paleomagnetic study was carried out on recent volcanic rocks exposed on Deception Island (63.0°S, 60.6°W), Antarctica. Sampling comprised all stratigraphic units exposed on the island, which include basaltic, andesitic and trachytic lavas, basaltic dykes and pyroclastic flows. Following stepwise thermal and alternating field demagnetization procedures, consistent characteristic remanence directions were determined at 21 sites, using principal-component analysis. The overall mean remanence direction for the Deception Island rocks is dec. 348.8°, inc. −73.7°, α 95 = 4.4°, N = 21, and is consistent within error with the geocentric axial dipole direction at the study locality. All of the studied rocks show normal polarity, indicating a Brunhes Chron age. The only available radiometric date of 153 ± 46 kyr agrees with this and suggests a minimum chronostratigraphic span of 100 kyr for the sampled rocks. The site mean directions show a Fisherian distribution and dispersion values compatible with current palaeosecular variation models. No evidence of the far-sided or right-handed effect is found in our data. Text Antarc* Antarctica Deception Island South Shetland Islands W. Antarctica HighWire Press (Stanford University) Deception Island ENVELOPE(-60.633,-60.633,-62.950,-62.950) South Shetland Islands Geophysical Journal International 153 2 333 343 |
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HighWire Press (Stanford University) |
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fthighwire |
language |
English |
topic |
Research Papers |
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Research Papers Baraldo, Andrés Rapalini, Augusto E. Böhnel, Harald Mena, Mabel Paleomagnetic study of Deception Island, South Shetland Islands, Antarctica |
topic_facet |
Research Papers |
description |
A paleomagnetic study was carried out on recent volcanic rocks exposed on Deception Island (63.0°S, 60.6°W), Antarctica. Sampling comprised all stratigraphic units exposed on the island, which include basaltic, andesitic and trachytic lavas, basaltic dykes and pyroclastic flows. Following stepwise thermal and alternating field demagnetization procedures, consistent characteristic remanence directions were determined at 21 sites, using principal-component analysis. The overall mean remanence direction for the Deception Island rocks is dec. 348.8°, inc. −73.7°, α 95 = 4.4°, N = 21, and is consistent within error with the geocentric axial dipole direction at the study locality. All of the studied rocks show normal polarity, indicating a Brunhes Chron age. The only available radiometric date of 153 ± 46 kyr agrees with this and suggests a minimum chronostratigraphic span of 100 kyr for the sampled rocks. The site mean directions show a Fisherian distribution and dispersion values compatible with current palaeosecular variation models. No evidence of the far-sided or right-handed effect is found in our data. |
format |
Text |
author |
Baraldo, Andrés Rapalini, Augusto E. Böhnel, Harald Mena, Mabel |
author_facet |
Baraldo, Andrés Rapalini, Augusto E. Böhnel, Harald Mena, Mabel |
author_sort |
Baraldo, Andrés |
title |
Paleomagnetic study of Deception Island, South Shetland Islands, Antarctica |
title_short |
Paleomagnetic study of Deception Island, South Shetland Islands, Antarctica |
title_full |
Paleomagnetic study of Deception Island, South Shetland Islands, Antarctica |
title_fullStr |
Paleomagnetic study of Deception Island, South Shetland Islands, Antarctica |
title_full_unstemmed |
Paleomagnetic study of Deception Island, South Shetland Islands, Antarctica |
title_sort |
paleomagnetic study of deception island, south shetland islands, antarctica |
publisher |
Oxford University Press |
publishDate |
2003 |
url |
http://gji.oxfordjournals.org/cgi/content/short/153/2/333 https://doi.org/10.1046/j.1365-246X.2003.01881.x |
long_lat |
ENVELOPE(-60.633,-60.633,-62.950,-62.950) |
geographic |
Deception Island South Shetland Islands |
geographic_facet |
Deception Island South Shetland Islands |
genre |
Antarc* Antarctica Deception Island South Shetland Islands W. Antarctica |
genre_facet |
Antarc* Antarctica Deception Island South Shetland Islands W. Antarctica |
op_relation |
http://gji.oxfordjournals.org/cgi/content/short/153/2/333 http://dx.doi.org/10.1046/j.1365-246X.2003.01881.x |
op_rights |
Copyright (C) 2003, Oxford University Press |
op_doi |
https://doi.org/10.1046/j.1365-246X.2003.01881.x |
container_title |
Geophysical Journal International |
container_volume |
153 |
container_issue |
2 |
container_start_page |
333 |
op_container_end_page |
343 |
_version_ |
1766249192572846080 |