Geological note: Age of the Hamningberg dolerite dyke, Varanger Peninsula, Finnmark: Devonian rather than Vendian - a revised enterpretation

In an earlier geochronology paper in this same journal, discordant U-Pb ages on zircons from a dolerite dyke near Hamningberg, Varanger Peninsula, Finnmark, were interpreted to favour a Vendian (Ediacaran) age of intrusion for this dyke. A re-assessment of this interpretation, and further considerat...

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Bibliographic Details
Main Author: Roberts, David
Format: Article in Journal/Newspaper
Language:English
Published: 2011
Subjects:
GEOKRONOLOGI
BERGGRUNNSGEOLOGI
DATERING
Norway
Syltefjord
Vardø
Finnmark
Varanger
Online Access:https://hdl.handle.net/11250/2674173
Description
Summary:In an earlier geochronology paper in this same journal, discordant U-Pb ages on zircons from a dolerite dyke near Hamningberg, Varanger Peninsula, Finnmark, were interpreted to favour a Vendian (Ediacaran) age of intrusion for this dyke. A re-assessment of this interpretation, and further consideration of the field, geochemical and 40Ar\/39Ar or K\/Ar age characteristics that this dyke shares with other, unmetamorphosed, Devonian-age dolerite dykes in this same region of NE Norway and NW Russia, leads to the conclusion that the Hamningberg dolerite dyke is also most likely of Late Devonian age. 59298

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