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Geol. Mag. 127 (3), 1990, pp. 209-224. Printed in Great Britain 209 The Solund-Stavfjord Ophiolite Complex and associated
 

Summary: Geol. Mag. 127 (3), 1990, pp. 209-224. Printed in Great Britain 209
The Solund-Stavfjord Ophiolite Complex and associated
rocks, west Norwegian Caledonides: geology, geochemistry
and tectonic environment
H. FURNES*, K. P. SKJERLIE*, R. B. PEDERSEN*, T. B. ANDERSENf, C J. STILLMANJ,
R. J. SUTHREN§, M. TYSSELAND* & L. B. GARMANN*
*Geologisk Institutt, Avd. A, Allegt. 41, 5007 Bergen, Norway
t Institutt for Geologi, P.O. Box 1047, 0316 Blindern, Oslo 3, Norway
% Department of Geology, Trinity College, Dublin 2, Ireland
§ Department of Geology, Oxford Polytechnic, Oxford OX3 0BP U.K.
(Received 18 May 1989; accepted! November 1989)
Abstract - Metabasalts of the Upper Ordovician Solund-Stavfjord Ophiolite Complex of the
westernmost Norwegian Caledonides, show N- to E-MORB affinity, with high Th/Ta (or Nb) ratios
giving evidence of subduction influence. The Solund-Stavfjord Ophiolite Complex is overlain by a
heterogeneous assemblage of sedimentary and volcanic rocks, the Stavenes Group, of which the
Heggoy Formation of metasandstones and phyllites conformably overlies the metabasalts of the
Solund-Stavfjord Ophiolite Complex. The Heggoy Formation contains, in places, abundant
metabasalt pillow lavas and minor intrusions, geochemically similar to those of the Solund-Stavfjord
Ophiolite Complex, and basic metavolcaniclastites of island arc tholeiite (IAT) composition. This
indicates that the Solund-Stavfjord Ophiolite Complex and Heggoy Formation developed in a

  

Source: Andersen, Torgeir Bjørge - Centre for Physics of Geological Processes & Department of Geosciences, Universitetet i Oslo

 

Collections: Geosciences