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Tectonic evolution of the west Scotia Sea

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. 10.1029/2004JB003154

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Abstract/Summary

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.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2004JB003154
Programmes: BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Antarctica in the Dynamic Global Plate System
ISSN: 0148-0227
Additional Keywords: Plate tectonics, Reconstructions
NORA Subject Terms: Earth Sciences
Date made live: 19 Dec 2007 13:28
URI: http://nora.nerc.ac.uk/id/eprint/1750

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