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Journal of the Geological Society; 1997; v. 154; issue.4; p. 645-652;
DOI: 10.1144/gsjgs.154.4.0645
© 1997 Geological Society of London

Article

Late Quaternary faulting and neotectonics, South Victoria Land, Antarctica

SARAH JONES

Department of Geology, University of Otago, PO Box 56, Dunedin, New Zealand

Three Quaternary fault traces in Hidden and Garwood Valleys, South Victoria Land, provide direct evidence for neotectonic activity in the Transantarctic Mountain rift shoulder of the West Antarctic Rift system. The faults trend NE-SW and all show a large component of sinistral strike-slip displacement. The late Quaternary faults lie parallel to Palaeozoic brittle structures, suggesting that inherited anistropy has governed younger fault orientations. Sinistral displacement on NE-SW-striking Quaternary faults appears to be inconsistent with the predicted Cenozoic NW-SE dextral oblique extensional regime in South Victoria Land but can be accommodated by minor clockwise rotation of crustal blocks.


Keywords: Neotectonics, Antarctica, Victoria Land, rifting, Transantarctic Mountains.




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