Physics – Geophysics
Scientific paper
Apr 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3107603e&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 7, CiteID L07603
Physics
Geophysics
Geodesy And Gravity: Crustal Movements-Interplate (8155), Marine Geology And Geophysics: Plate Tectonics (8150, 8155, 8157, 8158), Tectonophysics: Plate Motions-Past (3040), Information Related To Geographic Region: Antarctica, Information Related To Geographic Region: Pacific Ocean
Scientific paper
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.
Eagles Graeme
Gohl Karsten
Larter Robert D.
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