Possible evidence for Late Cretaceous off-axis volcanism in the outer James Ross Basin
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.(Received May 6 1998)
(Accepted March 24 1999)
Key Words: Larsen Basin; Maastrichtian; Marambio Group; off-axis volcanism.
p1 Department of Geology & Petroleum Geology, University of Aberdeen, Aberdeen AB24 3UE, UK
p2 Geological Institute, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark