Extension in the western Ross Sea region-links between Adare Basin and Victoria Land Basin

Details Extension in the western Ross Sea region-links between Adare Basin and Victoria Land Basin Extension in the western Ross Sea region-links between Adare Basin and Victoria Land Basin

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3320315d&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 20, CiteID L20315

Physics

Geophysics

6

Marine Geology And Geophysics: Plate Tectonics (8150, 8155, 8157, 8158), Marine Geology And Geophysics: Marine Magnetics And Paleomagnetics (1550), Tectonophysics: Continental Tectonics: Extensional (0905), Tectonophysics: Plate Motions: Past (3040), Geographic Location: Antarctica (4207)

Scientific paper

Spreading in the Adare Basin off north-western Ross Sea (43-26 Ma) and extension in the Victoria Land Basin (VLB, > 36 Ma) are used to constrain the pole of rotation for the Adare Basin, providing a rifting model for the region for the past 45 Ma. The offset from Northern Basin to VLB at about 74°S coincides with the linear Polar-3 magnetic anomaly, inferred to be caused by a major 48 - 34 Ma igneous intrusion. The style of extension apparently changed at about 34 Ma, with the end of intrusion at the Polar-3 anomaly, a change from highly asymmetric extension in Adare Basin, and the onset of major subsidence on the flanks of VLB. Ductile lower crustal and lithospheric flow is proposed as the cause of the inferred thick crust underlying southern Adare Basin, and a result of the constraining of extension to the adjacent contiguous Northern Basin.

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