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U–Pb geochronology of Cretaceous magmatism on Svalbard and Franz Josef Land, Barents Sea Large Igneous Province

Published online by Cambridge University Press:  11 June 2013

FERNANDO CORFU*
Affiliation:
Department of Geosciences, University of Oslo, Postbox 1047 Blindern, N-0316 Oslo, Norway
STÉPHANE POLTEAU
Affiliation:
Volcanic Basin Petroleum Research AS, Forskningsparken, Gaustadalléen 21, N-0349 Oslo, Norway
SVERRE PLANKE
Affiliation:
Volcanic Basin Petroleum Research AS, Forskningsparken, Gaustadalléen 21, N-0349 Oslo, Norway
JAN INGE FALEIDE
Affiliation:
Department of Geosciences, University of Oslo, Postbox 1047 Blindern, N-0316 Oslo, Norway
HENRIK SVENSEN
Affiliation:
Physics of Geological Processes, University of Oslo, Postbox 1048 Blindern, N-0316 Oslo, Norway
ANDREW ZAYONCHECK
Affiliation:
Geological Institute of the Russian Academy of Science, St Petersburg Laboratory, 190121, 120 Moyka Quay, St Petersburg, Russia All-Russian Research Institute for Geology and Mineral Resources of the World Ocean 190121, 1 Angliysky Avenue, St Petersburg, Russia
NIKOLAY STOLBOV
Affiliation:
All-Russian Research Institute for Geology and Mineral Resources of the World Ocean 190121, 1 Angliysky Avenue, St Petersburg, Russia
*
Author for correspondence: fernando.corfu@geo.uio.no

Abstract

The opening of the Arctic oceanic basins in the Mesozoic and Cenozoic proceeded in steps, with episodes of magmatism and sedimentation marking specific stages in this development. In addition to the stratigraphic record provided by sediments and fossils, the intrusive and extrusive rocks yield important information on this evolution. This study has determined the ages of mafic sills and a felsic tuff in Svalbard and Franz Josef Land using the isotope dilution thermal ionization mass spectrometry (ID-TIMS) U–Pb method on zircon, baddeleyite, titanite and rutile. The results indicate crystallization of the Diabasodden sill at 124.5 ± 0.2 Ma and the Linnévatn sill at 124.7 ± 0.3 Ma, the latter also containing slightly younger secondary titanite with an age of 123.9 ± 0.3 Ma. A bentonite in the Helvetiafjellet Formation, also on Svalbard, has an age of 123.3 ± 0.2 Ma. Zircon in mafic sills intersected by drill cores in Franz Josef Land indicate an age of 122.7 Ma for a thick sill on Severnaya Island and a single grain age of ≥122.2 ± 1.1 Ma for a thinner sill on Nagurskaya Island. These data emphasize the importance and relatively short-lived nature of the Cretaceous magmatic event in the region.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 2013 

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U–Pb geochronology of Cretaceous magmatism on Svalbard and Franz Josef Land, Barents Sea Large Igneous Province
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