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Possible evidence for Late Cretaceous off-axis volcanism in the outer James Ross Basin

Published online by Cambridge University Press:  06 May 2004

Simon A. Lomas  and
Richard V. Dingle
Simon A. Lomas
Affiliation:
British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK Department of Geology & Petroleum Geology, University of Aberdeen, Aberdeen AB24 3UE, UK
Richard V. Dingle
Affiliation:
British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK Geological Institute, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
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Abstract

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A prominent volcaniclastic channel sandstone deposited by a landward-flowing sediment gravity flow is described from the Maastrichtian of Snow Hill Island in the northern Larsen Basin. The characteristics of this petrographically distinct event deposit appear to indicate a volcanic source to the east of Snow Hill Island, well away from the magmatic arc landmass which sourced the bulk of the Larsen Basin fill, suggesting minor off-axis intrabasinal volcanism in Maastrichtian to Paleogene times.

Keywords

Larsen BasinMaastrichtianMarambio Groupoff-axis volcanism
Type
Papers—Earth Sciences and Glaciology
Information
Antarctic Science , Volume 11 , Issue 3 , September 1999 , pp. 332 - 337
Copyright
© Antarctic Science Ltd 1999