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dc.contributor.authorRoberts, David
dc.contributor.authorWalker, Nicholas
dc.coverage.spatial24362 Syltefjord
dc.description.abstractA dolerite dyke cutting very low-grade metasedimentary rocks of the Løkvik- fjellet Group near Hamningberg, NE Varanger Peninsula, Finnmark, has yielded a U-Pb zircon upper intercept age of 567,1 +30\/23 Ma. This ENE-WSW-trending dyke, and others of comparable field character, petrography and geochemistry in this northeastern part of Varanger, have previously given Late Devonian\/Early Carboniferous, K-Ar whole-rock ages. Accepting 567 Ma as the approximate age of intrusion, the K-Ar dates are considered to reflect a thermal resetting associ- ated with either a late-Scandian pulse or a slightly later, regional crustal extension and rifting event known from borehole data in the Barents Sea. A Late Devonian thermal overprint has also affected comparable dolerite dykes on the nearby Rybachi Peninsula of Northwest Russia.
dc.relation.ispartofseriesNGU Bulletin (432)
dc.rightsNavngivelse 4.0 Internasjonal
dc.titleU-Pb zircon age of a dolerite dyke from near Hamningberg,Varanger Peninsula, North Norway, and its regional significance
dc.typeJournal article

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Navngivelse 4.0 Internasjonal
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