NDLI: Dolerites of Svalbard, north-west Barents Sea Shelf: age, tectonic setting and significance for geotectonic interpretation of the High-Arctic Large Igneous Province

Content Provider	Taylor & Francis Online
Author	Krajewski, Krzysztof P. Dubinska, Elzbieta Pécskay, Zoltán Nejbert, Krzysztof
Abstract	The dolerites of Svalbard are mineralogically and geochemically homogeneous with geochemical features typical of continental within-plate tholeiites. Their geochemistry is similar to tholeiites belonging to a bimodal suite defined as the High-Arctic Large Igneous Province (HALIP). K–Ar dating of numerous dolerites sampled from many locations across Svalbard define a narrow time span of this magmatism from 125.5±3.6 to 78.3±2.6 Mya. Discrete peaks of intensive activity occurred at 115.3, 100.8, 91.3 and 78.5 Mya corresponding to (1) breakup of the continental crust and formation of an initial rift as a result of mantle plume activity, located in the southern part of the Alpha Ridge; (2) magmatic activity related to spreading along the Alpha Ridge that led to the development of the initial oceanic crust and (3) continuation of spreading along the Alpha Ridge and termination of magmatic activity related to HALIP (last two peaks at 91.3 and 78.5 Mya).
File Format	PDF HTM / HTML
ISSN	17518369
DOI	10.3402/polar.v30i0.7306
Journal	Polar Research
Volume Number	30
Issue Number	1
Language	English
Publisher	Routledge
Publisher Date	2011-08-03
Access Restriction	Open
Subject Keyword	Dolerite Geochemistry Petrogenesis K–Ar whole rock ages Svalbard Cretaceous
Content Type	Text
Resource Type	Article
Subject	1900/1901 Environmental Chemistry Environmental Science Oceanography

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Dolerites of Svalbard, north-west Barents Sea Shelf: age, tectonic setting and significance for geotectonic interpretation of the High-Arctic Large Igneous Province