Tectonic evolution of the west Scotia Sea
Joint inversion of isochron and flow line data from the flanks of the extinct West Scotia Ridge spreading center yields five reconstruction rotations for times between the inception of spreading prior to chron C8 (26.5 Ma), and extinction around chron C3A (6.6–5.9 Ma). When they are placed in a regi...
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American Geophysical Union
2005
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Online Access: | http://nora.nerc.ac.uk/id/eprint/1750/ http://www.agu.org/pubs/crossref/2005/2004JB003154.shtml https://doi.org/10.1029/2004JB003154 |
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ftnerc:oai:nora.nerc.ac.uk:1750 2024-06-09T07:40:35+00:00 Tectonic evolution of the west Scotia Sea Eagles, Graeme Livermore, Roy A. Fairhead, J. Derek Morris, Peter 2005 http://nora.nerc.ac.uk/id/eprint/1750/ http://www.agu.org/pubs/crossref/2005/2004JB003154.shtml https://doi.org/10.1029/2004JB003154 unknown American Geophysical Union Eagles, Graeme; Livermore, Roy A.; Fairhead, J. Derek; Morris, Peter. 2005 Tectonic evolution of the west Scotia Sea. Journal of Geophysical Research, 110 (B2), B02401. 19, pp. https://doi.org/10.1029/2004JB003154 <https://doi.org/10.1029/2004JB003154> Earth Sciences Publication - Article PeerReviewed 2005 ftnerc https://doi.org/10.1029/2004JB003154 2024-05-15T08:42:16Z Joint inversion of isochron and flow line data from the flanks of the extinct West Scotia Ridge spreading center yields five reconstruction rotations for times between the inception of spreading prior to chron C8 (26.5 Ma), and extinction around chron C3A (6.6–5.9 Ma). When they are placed in a regional plate circuit, the rotations predict plate motions consistent with known tectonic events at the margins of the Scotia Sea: Oligocene extension in Powell Basin; Miocene convergence in Tierra del Fuego and at the North Scotia Ridge; and Miocene transpression at the Shackleton Fracture Zone. The inversion results are consistent with a spreading history involving only two plates, at rates similar to those between the enclosing South America and Antarctica plates after chron C5C (16.7 Ma), but that were faster beforehand. The spreading rate drop accompanies inception of the East Scotia Ridge back-arc spreading center, which may therefore have assumed the role of the West Scotia Ridge in accommodating eastward motion of the trench at the eastern boundary of the Scotia Sea. This interpretation is most easily incorporated into a model in which the basins in the central parts of the Scotia Sea had already formed by chron C8, contrary to some widely accepted interpretations, and which has significant implications for paleoceanography and paleobiogeography. Article in Journal/Newspaper Antarc* Antarctica Scotia Sea Tierra del Fuego Natural Environment Research Council: NERC Open Research Archive East Scotia Ridge ENVELOPE(-29.250,-29.250,-57.917,-57.917) North Scotia Ridge ENVELOPE(-51.431,-51.431,-53.581,-53.581) Powell Basin ENVELOPE(-49.500,-49.500,-62.250,-62.250) Scotia Sea Shackleton Shackleton Fracture Zone ENVELOPE(-60.000,-60.000,-60.000,-60.000) West Scotia Ridge ENVELOPE(-56.500,-56.500,-56.833,-56.833) Journal of Geophysical Research: Solid Earth 110 B2 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences Eagles, Graeme Livermore, Roy A. Fairhead, J. Derek Morris, Peter Tectonic evolution of the west Scotia Sea |
topic_facet |
Earth Sciences |
description |
Joint inversion of isochron and flow line data from the flanks of the extinct West Scotia Ridge spreading center yields five reconstruction rotations for times between the inception of spreading prior to chron C8 (26.5 Ma), and extinction around chron C3A (6.6–5.9 Ma). When they are placed in a regional plate circuit, the rotations predict plate motions consistent with known tectonic events at the margins of the Scotia Sea: Oligocene extension in Powell Basin; Miocene convergence in Tierra del Fuego and at the North Scotia Ridge; and Miocene transpression at the Shackleton Fracture Zone. The inversion results are consistent with a spreading history involving only two plates, at rates similar to those between the enclosing South America and Antarctica plates after chron C5C (16.7 Ma), but that were faster beforehand. The spreading rate drop accompanies inception of the East Scotia Ridge back-arc spreading center, which may therefore have assumed the role of the West Scotia Ridge in accommodating eastward motion of the trench at the eastern boundary of the Scotia Sea. This interpretation is most easily incorporated into a model in which the basins in the central parts of the Scotia Sea had already formed by chron C8, contrary to some widely accepted interpretations, and which has significant implications for paleoceanography and paleobiogeography. |
format |
Article in Journal/Newspaper |
author |
Eagles, Graeme Livermore, Roy A. Fairhead, J. Derek Morris, Peter |
author_facet |
Eagles, Graeme Livermore, Roy A. Fairhead, J. Derek Morris, Peter |
author_sort |
Eagles, Graeme |
title |
Tectonic evolution of the west Scotia Sea |
title_short |
Tectonic evolution of the west Scotia Sea |
title_full |
Tectonic evolution of the west Scotia Sea |
title_fullStr |
Tectonic evolution of the west Scotia Sea |
title_full_unstemmed |
Tectonic evolution of the west Scotia Sea |
title_sort |
tectonic evolution of the west scotia sea |
publisher |
American Geophysical Union |
publishDate |
2005 |
url |
http://nora.nerc.ac.uk/id/eprint/1750/ http://www.agu.org/pubs/crossref/2005/2004JB003154.shtml https://doi.org/10.1029/2004JB003154 |
long_lat |
ENVELOPE(-29.250,-29.250,-57.917,-57.917) ENVELOPE(-51.431,-51.431,-53.581,-53.581) ENVELOPE(-49.500,-49.500,-62.250,-62.250) ENVELOPE(-60.000,-60.000,-60.000,-60.000) ENVELOPE(-56.500,-56.500,-56.833,-56.833) |
geographic |
East Scotia Ridge North Scotia Ridge Powell Basin Scotia Sea Shackleton Shackleton Fracture Zone West Scotia Ridge |
geographic_facet |
East Scotia Ridge North Scotia Ridge Powell Basin Scotia Sea Shackleton Shackleton Fracture Zone West Scotia Ridge |
genre |
Antarc* Antarctica Scotia Sea Tierra del Fuego |
genre_facet |
Antarc* Antarctica Scotia Sea Tierra del Fuego |
op_relation |
Eagles, Graeme; Livermore, Roy A.; Fairhead, J. Derek; Morris, Peter. 2005 Tectonic evolution of the west Scotia Sea. Journal of Geophysical Research, 110 (B2), B02401. 19, pp. https://doi.org/10.1029/2004JB003154 <https://doi.org/10.1029/2004JB003154> |
op_doi |
https://doi.org/10.1029/2004JB003154 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
110 |
container_issue |
B2 |
_version_ |
1801383956645412864 |