Life of the Bellingshausen plate

Eagles, Graeme; Gohl, Karsten; Larter, Robert D.. 2004 Life of the Bellingshausen plate. Geophysical Research Letters, 31 (7), L07603. 5, pp. 10.1029/2003GL019127

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Abstract/Summary

The onset of independent Bellingshausen plate movement in the South Pacific is estimated at just after chron C33o. This event closely follows a change in the offset sense on the transform arm of the Late Cretaceous Pacific-Phoenix-Antarctic triple junction and accompanies the creation and/or lengthening, by different mechanisms, of long-offsets on the Pacific-Antarctic ridge at the Udintsev, Tharp, Heezen and V transforms, as the triple junction stepped away from the ridge. At around chron C27, the Bellingshausen plate ceased to move independently and the Pacific-Antarctic ridge inherited the set of long offset transforms. Shortly afterwards, the gravity fabric on the flanks of much of the ridge displays evidence for a spreading rate decrease possibly related to transpression on the long-offset transforms. We speculate on a link between these events and regional tectonic changes around chron C27.

Item Type:	Article
Identification Number/DOI:	10.1029/2003GL019127
Programmes:	BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Antarctica in the Dynamic Global Plate System
ISSN:	0094-8276
NORA Subject Terms:	Earth Sciences
Date made live:	16 Jan 2012 13:17
URI:	http://nora.nerc.ac.uk/id/eprint/12154

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