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Geology; March 1993; v. 21; no. 3; p. 251-254; DOI: 10.1130/0091-7613(1993)021<0251:LCUAVO>2.3.CO;2
© 1993 Geological Society of America
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Late Cenozoic uplift and volcanism on Spitsbergen: Caused by mantle convection?

Erling Vågnes1 and Hans Erik Foss Amundsen2

1 Department of Geology, University of Oslo, P.O. Box 1047, Blindern, N-0316 Oslo, Norway
2 Mineralogical-Geological Museum, Sarsgt. 1, N-0562 Oslo, Norway

Regional tectonic uplift, heat-flow measurements, and P-T estimates on upper-mantle xenoliths associated with Neogene volcanic rocks indicate a strongly thinned (~50 km thick) lithosphere beneath Svalbard, 650 km north of Scandinavia. Data on Neogene volcanic rocks and xenoliths indicate an ~50 °C temperature anomaly in the underlying asthenosphere, together with volatile-rich conditions in the upper mantle. The Svalbard uplift is one of several Cenozoic epeirogenic uplifts along the margins of the North Atlantic. Boundary processes occurring where hot-spot-influenced asthenosphere abuts cold, deep continental lithosphere seem to be likely explanations for the uplifts.




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References
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