Age and correlation of volcanism in central Livingston Island, South Shetland Islands: K-Ar and geochemical constraints
Volcanic sequences in central Livingston Island can be divided into two broad groups. The older group consists of basalt-dacite lavas, clastic rocks and associated hypabyssal intrusions. The lavas are lithologically and compositionally similar to other pre-Pliocene, volcanic arc lavas in the South S...
Published in: | Journal of South American Earth Sciences |
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1996
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ftnerc:oai:nora.nerc.ac.uk:515279 2023-05-15T17:08:07+02:00 Age and correlation of volcanism in central Livingston Island, South Shetland Islands: K-Ar and geochemical constraints Smellie, J.L. Pallàs, R. Sàbat, F. Zheng, X. 1996 http://nora.nerc.ac.uk/id/eprint/515279/ https://doi.org/10.1016/0895-9811(96)00012-0 unknown Elsevier Smellie, J.L.; Pallàs, R.; Sàbat, F.; Zheng, X. 1996 Age and correlation of volcanism in central Livingston Island, South Shetland Islands: K-Ar and geochemical constraints. Journal of South American Earth Sciences, 9 (3-4). 265-272. https://doi.org/10.1016/0895-9811(96)00012-0 <https://doi.org/10.1016/0895-9811(96)00012-0> Publication - Article PeerReviewed 1996 ftnerc https://doi.org/10.1016/0895-9811(96)00012-0 2023-02-04T19:43:58Z Volcanic sequences in central Livingston Island can be divided into two broad groups. The older group consists of basalt-dacite lavas, clastic rocks and associated hypabyssal intrusions. The lavas are lithologically and compositionally similar to other pre-Pliocene, volcanic arc lavas in the South Shetland Islands. The outcrops vary from relatively fresh (at Cape Shirreff, Hannah Point and Siddons Point) to indurated and pervasively altered (at Mount Bowles, Burdick Peak and Hurd Peninsula). Samples from the fresh outcrops yielded Late Cretaceous ages for eruption or intrusion, ranging from 90.2 ± 5.6 Ma at Cape Shirreff, to 73.0 ± 2.3 at Siddons Point. Chemical analyses of the lavas suggest that the sequences at these two outcrops can probably be correlated stratigraphically with the Byers Group and Coppermine Formation, respectively. Two samples from Hannah Point yielded conflicting ages of 87.9 ± 2.6 Ma and 67.5 ± 2.5 Ma from the centre and top of the sequence, respectively. The stratigraphical affinities of the Hannah Point sequence cannot yet be determined unambiguously but it is unlikely to be part of the Byers Group. All of the samples from the altered outcrops (which correspond to the Mount Bowles Formation) yielded Eocene-Oligocene K-Ar ages (44.4 to 35.0 Ma), interpreted as reset ages related to the emplacement and cooling of a nearby Eocene tonalite pluton responsible for much of the alteration, and also dated in this study (43.3 ± 2.8 Ma). A Cretaceous eruptive age (possibly Late Cretaceous) for the altered outcrops is likely but cannot yet be proven. By contrast, the younger group consists of degraded basalt lava flows, tuff cone and tuff ring remnants, which are part of the Inott Point Formation. The lavas are very fresh and Pleistocene or Recent in age (≤ 1 Ma). They are compositionally distinctive and are indistinguishable from supra-subduction alkali basalts preserved elsewhere in Livingston, Greenwich and Penguin islands. Article in Journal/Newspaper Livingston Island South Shetland Islands Natural Environment Research Council: NERC Open Research Archive South Shetland Islands Greenwich Livingston Island ENVELOPE(-60.500,-60.500,-62.600,-62.600) Hannah ENVELOPE(-60.613,-60.613,-62.654,-62.654) Byers ENVELOPE(-60.283,-60.283,-63.900,-63.900) Hurd ENVELOPE(-60.366,-60.366,-62.682,-62.682) Bowles ENVELOPE(-54.091,-54.091,-61.318,-61.318) Shirreff ENVELOPE(-60.792,-60.792,-62.459,-62.459) Cape Shirreff ENVELOPE(-60.800,-60.800,-62.417,-62.417) Hurd peninsula ENVELOPE(-60.366,-60.366,-62.676,-62.676) Hannah Point ENVELOPE(-60.617,-60.617,-62.650,-62.650) Inott Point ENVELOPE(-60.006,-60.006,-62.525,-62.525) Siddons ENVELOPE(-60.433,-60.433,-62.550,-62.550) Mount Bowles ENVELOPE(163.050,163.050,-77.617,-77.617) Burdick Peak ENVELOPE(-60.256,-60.256,-62.635,-62.635) Siddons Point ENVELOPE(-60.450,-60.450,-62.550,-62.550) Journal of South American Earth Sciences 9 3-4 265 272 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
Volcanic sequences in central Livingston Island can be divided into two broad groups. The older group consists of basalt-dacite lavas, clastic rocks and associated hypabyssal intrusions. The lavas are lithologically and compositionally similar to other pre-Pliocene, volcanic arc lavas in the South Shetland Islands. The outcrops vary from relatively fresh (at Cape Shirreff, Hannah Point and Siddons Point) to indurated and pervasively altered (at Mount Bowles, Burdick Peak and Hurd Peninsula). Samples from the fresh outcrops yielded Late Cretaceous ages for eruption or intrusion, ranging from 90.2 ± 5.6 Ma at Cape Shirreff, to 73.0 ± 2.3 at Siddons Point. Chemical analyses of the lavas suggest that the sequences at these two outcrops can probably be correlated stratigraphically with the Byers Group and Coppermine Formation, respectively. Two samples from Hannah Point yielded conflicting ages of 87.9 ± 2.6 Ma and 67.5 ± 2.5 Ma from the centre and top of the sequence, respectively. The stratigraphical affinities of the Hannah Point sequence cannot yet be determined unambiguously but it is unlikely to be part of the Byers Group. All of the samples from the altered outcrops (which correspond to the Mount Bowles Formation) yielded Eocene-Oligocene K-Ar ages (44.4 to 35.0 Ma), interpreted as reset ages related to the emplacement and cooling of a nearby Eocene tonalite pluton responsible for much of the alteration, and also dated in this study (43.3 ± 2.8 Ma). A Cretaceous eruptive age (possibly Late Cretaceous) for the altered outcrops is likely but cannot yet be proven. By contrast, the younger group consists of degraded basalt lava flows, tuff cone and tuff ring remnants, which are part of the Inott Point Formation. The lavas are very fresh and Pleistocene or Recent in age (≤ 1 Ma). They are compositionally distinctive and are indistinguishable from supra-subduction alkali basalts preserved elsewhere in Livingston, Greenwich and Penguin islands. |
format |
Article in Journal/Newspaper |
author |
Smellie, J.L. Pallàs, R. Sàbat, F. Zheng, X. |
spellingShingle |
Smellie, J.L. Pallàs, R. Sàbat, F. Zheng, X. Age and correlation of volcanism in central Livingston Island, South Shetland Islands: K-Ar and geochemical constraints |
author_facet |
Smellie, J.L. Pallàs, R. Sàbat, F. Zheng, X. |
author_sort |
Smellie, J.L. |
title |
Age and correlation of volcanism in central Livingston Island, South Shetland Islands: K-Ar and geochemical constraints |
title_short |
Age and correlation of volcanism in central Livingston Island, South Shetland Islands: K-Ar and geochemical constraints |
title_full |
Age and correlation of volcanism in central Livingston Island, South Shetland Islands: K-Ar and geochemical constraints |
title_fullStr |
Age and correlation of volcanism in central Livingston Island, South Shetland Islands: K-Ar and geochemical constraints |
title_full_unstemmed |
Age and correlation of volcanism in central Livingston Island, South Shetland Islands: K-Ar and geochemical constraints |
title_sort |
age and correlation of volcanism in central livingston island, south shetland islands: k-ar and geochemical constraints |
publisher |
Elsevier |
publishDate |
1996 |
url |
http://nora.nerc.ac.uk/id/eprint/515279/ https://doi.org/10.1016/0895-9811(96)00012-0 |
long_lat |
ENVELOPE(-60.500,-60.500,-62.600,-62.600) ENVELOPE(-60.613,-60.613,-62.654,-62.654) ENVELOPE(-60.283,-60.283,-63.900,-63.900) ENVELOPE(-60.366,-60.366,-62.682,-62.682) ENVELOPE(-54.091,-54.091,-61.318,-61.318) ENVELOPE(-60.792,-60.792,-62.459,-62.459) ENVELOPE(-60.800,-60.800,-62.417,-62.417) ENVELOPE(-60.366,-60.366,-62.676,-62.676) ENVELOPE(-60.617,-60.617,-62.650,-62.650) ENVELOPE(-60.006,-60.006,-62.525,-62.525) ENVELOPE(-60.433,-60.433,-62.550,-62.550) ENVELOPE(163.050,163.050,-77.617,-77.617) ENVELOPE(-60.256,-60.256,-62.635,-62.635) ENVELOPE(-60.450,-60.450,-62.550,-62.550) |
geographic |
South Shetland Islands Greenwich Livingston Island Hannah Byers Hurd Bowles Shirreff Cape Shirreff Hurd peninsula Hannah Point Inott Point Siddons Mount Bowles Burdick Peak Siddons Point |
geographic_facet |
South Shetland Islands Greenwich Livingston Island Hannah Byers Hurd Bowles Shirreff Cape Shirreff Hurd peninsula Hannah Point Inott Point Siddons Mount Bowles Burdick Peak Siddons Point |
genre |
Livingston Island South Shetland Islands |
genre_facet |
Livingston Island South Shetland Islands |
op_relation |
Smellie, J.L.; Pallàs, R.; Sàbat, F.; Zheng, X. 1996 Age and correlation of volcanism in central Livingston Island, South Shetland Islands: K-Ar and geochemical constraints. Journal of South American Earth Sciences, 9 (3-4). 265-272. https://doi.org/10.1016/0895-9811(96)00012-0 <https://doi.org/10.1016/0895-9811(96)00012-0> |
op_doi |
https://doi.org/10.1016/0895-9811(96)00012-0 |
container_title |
Journal of South American Earth Sciences |
container_volume |
9 |
container_issue |
3-4 |
container_start_page |
265 |
op_container_end_page |
272 |
_version_ |
1766063749649661952 |