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Geochemistry of Upper Riphean-Vendian basalts associated with the ‘sparagmites’ of southern Norway

Published online by Cambridge University Press:  01 May 2009

H. Furnes ,
J. P. Nystuen ,
A. O. Brunfelt  and
S. Solheim
H. Furnes
Affiliation:
Geologisk Institutt Avd A, All´gt 41 5014 Bergen, Norway
J. P. Nystuen
Affiliation:
Institutt for Geologi, Norges Landbrukshøgskole Boks 21 1432 Ås-NLH, Norway
A. O. Brunfelt
Affiliation:
Mineralogisk-geologisk museum, Sarsgt 1 Oslo 5, Norway
S. Solheim
Affiliation:
Mineralogisk-geologisk museum, Sarsgt 1 Oslo 5, Norway
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Abstract

Summary. Upper Riphean/Vendian basalt lavas within the Hedmark Group of the Osen-Røa Nappe Complex, the lowest tectonostratigraphic unit within the Scandinavian Caledonides, are typical continental tholeiites. Differences in their REE patterns may reflect source heterogeneities, while the general lack of correlation between incompatible trace element ratios may be due to contamination of the basalts by continental crust. Their association with fluvial deposits in NNW-trending graben, and some geochemical disparities with time-equivalent basalt dykes of MORB-like character in tectonically higher units, may indicate their formation in an aulacogen related to the central rift zone of the lapetus Ocean.

Type
Articles
Information
Geological Magazine , Volume 120 , Issue 4 , July 1983 , pp. 349 - 361
Copyright
Copyright © Cambridge University Press 1983

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