Life of the Bellingshausen plate

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.

Details

Publication status:
Published
Author(s):
Authors: Eagles, Graeme, Gohl, Karsten, Larter, Robert D. ORCID

On this site: Robert Larter
Date:
1 January, 2004
Journal/Source:
Geophysical Research Letters / 31
Page(s):
5pp
Digital Object Identifier (DOI):
https://doi.org/10.1029/2003GL019127