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Tectonic elements of the continental margin of East Antarctica, 38-164ºE

April 1, 2007

The East Antarctic continental margin from 38–164ºE is divided into western and eastern provinces that
developed during the separation of India from Australia–Antarctica (Early Cretaceous) and Australia from Antarctica
(Late Cretaceous). In the overlap between these provinces the geology is complex and bears the imprint of both
extension/spreading episodes, with an overprinting of volcanism. The main rift-bounding faults appear to
approximately coincide with the outer edge of the continental shelf. Inboard of these faults, the sedimentary cover thins
above shallowing basement towards the coast where crystalline basement generally crops out. The continental slope
and the landward flanks of the ocean basins, are blanketed by up to 9–10 km of mainly post-rift sediments in margin-parallel basins, except in the Bruce Rise area. Beneath this blanket, extensive rift basins are identified off Enderby and
Wilkes Land/Terre Adélie; however, their extent and detailed structures are difficult to determine.

Citation Information

Publication Year 2007
Title Tectonic elements of the continental margin of East Antarctica, 38-164ºE
DOI 10.3133/ofr20071047SRP085
Authors P. E. O'Brien, H.M.J. Stagg
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Open-File Report
Series Number 2007-1047-SRP-085
Index ID ofr20071047SRP085
Record Source USGS Publications Warehouse