dc.contributor.author | Roberts, David | |
dc.contributor.author | Walker, Nicholas | |
dc.coverage.spatial | 24362 Syltefjord | |
dc.date.accessioned | 2020-08-26T09:02:46Z | |
dc.date.available | 2020-08-26T09:02:46Z | |
dc.date.issued | 1997 | |
dc.identifier.issn | 0332-5768 | |
dc.identifier.uri | https://hdl.handle.net/11250/2674099 | |
dc.description.abstract | A 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.language.iso | eng | |
dc.relation.ispartofseries | NGU Bulletin (432) | |
dc.rights | Navngivelse 4.0 Internasjonal | |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/deed.no | |
dc.subject | DATERING | |
dc.subject | TEKTONIKK | |
dc.title | U-Pb zircon age of a dolerite dyke from near Hamningberg,Varanger Peninsula, North Norway, and its regional significance | |
dc.type | Journal article | |
dc.description.localcode | 49122 | |
dc.source.pagenumber | 95-102 | |