The stratigraphy and geochronology of Adelaide Island
The Mesozoic-Cenozoic volcanic arc of the Antarctic Peninsula is represented on Adelaide Island by a sedimentary and volcanic succession intruded by plutons. 40Ar-39 Ar step-heating age spectra have been obtained from volcanic rocks and hornblende separates from sedimentary clasts of plutonic origin...
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Cambridge University Press
1998
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Online Access: | http://nora.nerc.ac.uk/id/eprint/504032/ https://doi.org/10.1017/S095410209800056X |
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ftnerc:oai:nora.nerc.ac.uk:504032 2023-05-15T13:03:46+02:00 The stratigraphy and geochronology of Adelaide Island Griffiths, Chris J. Oglethorpe, Richard D. J. 1998 http://nora.nerc.ac.uk/id/eprint/504032/ https://doi.org/10.1017/S095410209800056X unknown Cambridge University Press Griffiths, Chris J.; Oglethorpe, Richard D. J. 1998 The stratigraphy and geochronology of Adelaide Island. Antarctic Science, 10 (04). 462-475. https://doi.org/10.1017/S095410209800056X <https://doi.org/10.1017/S095410209800056X> Publication - Article PeerReviewed 1998 ftnerc https://doi.org/10.1017/S095410209800056X 2023-02-04T19:38:10Z The Mesozoic-Cenozoic volcanic arc of the Antarctic Peninsula is represented on Adelaide Island by a sedimentary and volcanic succession intruded by plutons. 40Ar-39 Ar step-heating age spectra have been obtained from volcanic rocks and hornblende separates from sedimentary clasts of plutonic origin. These spectra show evidence for some argon loss, but, in general, have plateau ages which are consistent with the mapped stratigraphy and with other geochronological controls, suggesting that they approximate to original ages. As a result the following events in the evolution of Adelaide Island can be recognized: 1) mostly marine Mesozoic sedimentation, 2) Early Cretaceous (c. 141 Ma) plutonism (recorded in clasts from conglomerates), 3) Cretaceous volcanism, 4) Late Cretaceous (possibly Tertiary) sedimentation, 5) Early Tertiary volcanism, which was acidic in eastern outcrops and intermediate elsewhere, and 6) Eocene intermediate volcanism and deposition of arc-derived conglomerates. Volcanism was possibly coeval with known Palaeocene-Eocene plutonic activity on Adelaide Island (part of the Antarctic Peninsula Batholith) and with volcanism of similar age in northern Alexander Island and the South Shetland Islands. The volcanism on Adelaide Island and the South Shetland Islands, at least, was associated with a westward migration of the Antarctic Peninsula arc. Article in Journal/Newspaper Adelaide Island Alexander Island Antarc* Antarctic Antarctic Peninsula Antarctic Science South Shetland Islands Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula South Shetland Islands Alexander Island ENVELOPE(-69.895,-69.895,-71.287,-71.287) Adelaide Island ENVELOPE(-68.914,-68.914,-67.762,-67.762) Antarctic Science 10 4 462 475 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
language |
unknown |
description |
The Mesozoic-Cenozoic volcanic arc of the Antarctic Peninsula is represented on Adelaide Island by a sedimentary and volcanic succession intruded by plutons. 40Ar-39 Ar step-heating age spectra have been obtained from volcanic rocks and hornblende separates from sedimentary clasts of plutonic origin. These spectra show evidence for some argon loss, but, in general, have plateau ages which are consistent with the mapped stratigraphy and with other geochronological controls, suggesting that they approximate to original ages. As a result the following events in the evolution of Adelaide Island can be recognized: 1) mostly marine Mesozoic sedimentation, 2) Early Cretaceous (c. 141 Ma) plutonism (recorded in clasts from conglomerates), 3) Cretaceous volcanism, 4) Late Cretaceous (possibly Tertiary) sedimentation, 5) Early Tertiary volcanism, which was acidic in eastern outcrops and intermediate elsewhere, and 6) Eocene intermediate volcanism and deposition of arc-derived conglomerates. Volcanism was possibly coeval with known Palaeocene-Eocene plutonic activity on Adelaide Island (part of the Antarctic Peninsula Batholith) and with volcanism of similar age in northern Alexander Island and the South Shetland Islands. The volcanism on Adelaide Island and the South Shetland Islands, at least, was associated with a westward migration of the Antarctic Peninsula arc. |
format |
Article in Journal/Newspaper |
author |
Griffiths, Chris J. Oglethorpe, Richard D. J. |
spellingShingle |
Griffiths, Chris J. Oglethorpe, Richard D. J. The stratigraphy and geochronology of Adelaide Island |
author_facet |
Griffiths, Chris J. Oglethorpe, Richard D. J. |
author_sort |
Griffiths, Chris J. |
title |
The stratigraphy and geochronology of Adelaide Island |
title_short |
The stratigraphy and geochronology of Adelaide Island |
title_full |
The stratigraphy and geochronology of Adelaide Island |
title_fullStr |
The stratigraphy and geochronology of Adelaide Island |
title_full_unstemmed |
The stratigraphy and geochronology of Adelaide Island |
title_sort |
stratigraphy and geochronology of adelaide island |
publisher |
Cambridge University Press |
publishDate |
1998 |
url |
http://nora.nerc.ac.uk/id/eprint/504032/ https://doi.org/10.1017/S095410209800056X |
long_lat |
ENVELOPE(-69.895,-69.895,-71.287,-71.287) ENVELOPE(-68.914,-68.914,-67.762,-67.762) |
geographic |
Antarctic The Antarctic Antarctic Peninsula South Shetland Islands Alexander Island Adelaide Island |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula South Shetland Islands Alexander Island Adelaide Island |
genre |
Adelaide Island Alexander Island Antarc* Antarctic Antarctic Peninsula Antarctic Science South Shetland Islands |
genre_facet |
Adelaide Island Alexander Island Antarc* Antarctic Antarctic Peninsula Antarctic Science South Shetland Islands |
op_relation |
Griffiths, Chris J.; Oglethorpe, Richard D. J. 1998 The stratigraphy and geochronology of Adelaide Island. Antarctic Science, 10 (04). 462-475. https://doi.org/10.1017/S095410209800056X <https://doi.org/10.1017/S095410209800056X> |
op_doi |
https://doi.org/10.1017/S095410209800056X |
container_title |
Antarctic Science |
container_volume |
10 |
container_issue |
4 |
container_start_page |
462 |
op_container_end_page |
475 |
_version_ |
1766345420895682560 |