Age and composition of crystalline basement rocks on the Norwegian continental margin: offshore extension and continuity of
the Caledonian–Appalachian orogenic belt
Trond Slagstad
Børre Davidsen
J.Stephen Daly
10.6084/m9.figshare.3452903
https://geolsoc.figshare.com/articles/dataset/Age_and_composition_of_crystalline_basement_rocks_on_the_Norwegian_continental_margin_offshore_extension_and_continuity_of___the_Caledonian_Appalachian_orogenic_belt/3452903
<p>Twenty-two wells on the Norwegian continental margin have penetrated underlying basement. We present U–Pb zircon, whole-rock
geochemical, and Sm–Nd and Rb–Sr isotopic data from nine wells in the North Sea and Norwegian Sea with relevance to the offshore
continuation of the Norwegian Caledonides, and their correlation throughout the Caledonian–Appalachian orogenic belt. Palaeozoic
magmatism in the North Sea can be divided into two groups. The older group consists of 460 Ma calc-alkaline granites with
evolved isotopic compositions, correlative with similar rocks in the Uppermost Allochthon. The younger group consists of a
430 Ma dacite and a 421 Ma leucogabbro, with less evolved isotopic compositions. In the Norwegian Sea, isotopically evolved
granitic magmatism at 437 Ma and more juvenile dioritic magmatism at 447 Ma are correlative with magmatism in the Bindal and
Smøla–Hitra Batholiths in the Uppermost Allochthon. Metasedimentary basement rocks from the North Sea and Norwegian Sea, dominated
by Late Palaeoproterozoic and Mesoproterozoic grains, resemble rocks found in the Caledonides of Scotland, Greenland and Svalbard.
The new data, along with studies elsewhere along the belt, suggest that similar rocks may exist along much of the orogen.
</p>
2016-06-21 10:58:36
Uppermost Allochthon
Norwegian Sea
North Sea
Metasedimentary basement rocks
430 Ma dacite
magmatism
421 Ma leucogabbro
Geology