Opening history of Powell Basin, Antarctic Peninsula
The opening of Powell Basin was part of the regional response to N55°W relative plate motion of South America away from Antarctica, which led to the formation of Drake Passage during the Eocene and Oligocene. Restoration of microplates around the basin using gridded magnetic anomalies from its margi...
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ftnerc:oai:nora.nerc.ac.uk:13266 2023-05-15T13:45:11+02:00 Opening history of Powell Basin, Antarctic Peninsula Eagles, Graeme Livermore, Roy A. 2002 http://nora.nerc.ac.uk/id/eprint/13266/ unknown Elsevier Eagles, Graeme; Livermore, Roy A. 2002 Opening history of Powell Basin, Antarctic Peninsula. Marine Geology, 185 (3-4). 195-205. https://doi.org/10.1016/S0025-3227(02)00191-3 <https://doi.org/10.1016/S0025-3227(02)00191-3> Marine Sciences Earth Sciences Publication - Article PeerReviewed 2002 ftnerc https://doi.org/10.1016/S0025-3227(02)00191-3 2023-02-04T19:28:30Z The opening of Powell Basin was part of the regional response to N55°W relative plate motion of South America away from Antarctica, which led to the formation of Drake Passage during the Eocene and Oligocene. Restoration of microplates around the basin using gridded magnetic anomalies from its margins illustrates the pre-break-up continuity of the Pacific Margin Anomaly magnetic high associated with a Mesozoic arc-batholith. Newly compiled magnetic anomaly data over the Powell Basin show subdued linear seafloor spreading type anomalies. These are used, together with marginal and regional geology, to constrain the opening history of the basin. Magnetic reversal modelling suggests that slow spreading in Powell Basin probably occurred between 29.7 Ma and 21.8 Ma, following rifting of Mesozoic continental crust with associated break-up volcanism. A simple, two-phase model for the rotation of the South Orkney Microcontinent away from the Antarctic Peninsula accounts for the pattern of magnetic reversals recorded in Powell Basin, and for the structure of its margins. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Drake Passage Natural Environment Research Council: NERC Open Research Archive Antarctic Antarctic Peninsula Drake Passage Pacific Powell Basin ENVELOPE(-49.500,-49.500,-62.250,-62.250) The Antarctic Marine Geology 185 3-4 195 205 |
institution |
Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Marine Sciences Earth Sciences |
spellingShingle |
Marine Sciences Earth Sciences Eagles, Graeme Livermore, Roy A. Opening history of Powell Basin, Antarctic Peninsula |
topic_facet |
Marine Sciences Earth Sciences |
description |
The opening of Powell Basin was part of the regional response to N55°W relative plate motion of South America away from Antarctica, which led to the formation of Drake Passage during the Eocene and Oligocene. Restoration of microplates around the basin using gridded magnetic anomalies from its margins illustrates the pre-break-up continuity of the Pacific Margin Anomaly magnetic high associated with a Mesozoic arc-batholith. Newly compiled magnetic anomaly data over the Powell Basin show subdued linear seafloor spreading type anomalies. These are used, together with marginal and regional geology, to constrain the opening history of the basin. Magnetic reversal modelling suggests that slow spreading in Powell Basin probably occurred between 29.7 Ma and 21.8 Ma, following rifting of Mesozoic continental crust with associated break-up volcanism. A simple, two-phase model for the rotation of the South Orkney Microcontinent away from the Antarctic Peninsula accounts for the pattern of magnetic reversals recorded in Powell Basin, and for the structure of its margins. |
format |
Article in Journal/Newspaper |
author |
Eagles, Graeme Livermore, Roy A. |
author_facet |
Eagles, Graeme Livermore, Roy A. |
author_sort |
Eagles, Graeme |
title |
Opening history of Powell Basin, Antarctic Peninsula |
title_short |
Opening history of Powell Basin, Antarctic Peninsula |
title_full |
Opening history of Powell Basin, Antarctic Peninsula |
title_fullStr |
Opening history of Powell Basin, Antarctic Peninsula |
title_full_unstemmed |
Opening history of Powell Basin, Antarctic Peninsula |
title_sort |
opening history of powell basin, antarctic peninsula |
publisher |
Elsevier |
publishDate |
2002 |
url |
http://nora.nerc.ac.uk/id/eprint/13266/ |
long_lat |
ENVELOPE(-49.500,-49.500,-62.250,-62.250) |
geographic |
Antarctic Antarctic Peninsula Drake Passage Pacific Powell Basin The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Drake Passage Pacific Powell Basin The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Drake Passage |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Drake Passage |
op_relation |
Eagles, Graeme; Livermore, Roy A. 2002 Opening history of Powell Basin, Antarctic Peninsula. Marine Geology, 185 (3-4). 195-205. https://doi.org/10.1016/S0025-3227(02)00191-3 <https://doi.org/10.1016/S0025-3227(02)00191-3> |
op_doi |
https://doi.org/10.1016/S0025-3227(02)00191-3 |
container_title |
Marine Geology |
container_volume |
185 |
container_issue |
3-4 |
container_start_page |
195 |
op_container_end_page |
205 |
_version_ |
1766215431740194816 |