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Extension in the western Ross Sea region‐links between Adare Basin and Victoria Land Basin
Author(s) -
Davey F. J.,
Cande S. C.,
Stock J. M.
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl027383
Subject(s) - geology , structural basin , basin and range topography , rift , lithosphere , crust , subsidence , pull apart basin , sedimentary basin , paleontology , geomorphology , seismology , tectonics
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.