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Journal of the Geological Society, London, Vol. 147, 1990 pp. 59-68, 7 figs. Printed in Northern Ireland TheSunnfjordMelange,evidence of Silurianophioliteaccretion
 

Summary: Journal of the Geological Society, London, Vol. 147, 1990 pp. 59-68, 7 figs. Printed in Northern Ireland
TheSunnfjordMelange,evidence of Silurianophioliteaccretion
in theWestNorwegianCaledonides
T. B . ANDERSEN',K. P . SKJERLIE' & H . FURNES'
I Institutt for Geologi, Universitetet i Oslo. P. Box 1047. 0316Blindern, Oslo 3, Norway
'Geologisk Institutt Avd. A., All&. 41, 5007 Bergen-Universitet, Norway
Abstract: A majorcompositeterrane,theSunnfjordMelange,hasbeenidentifiedintheWest
Norwegian Caledonides. The rocks of the melange provide a terrane-link between the allochthonous
continental rocks of the Dalsfjord Suite with its cover of continental margin deposits and the oceanic
terraneoftheSolund-StavfjordOphioliteComplex.Themelangewasformed as theophiolitewas
emplaced on the the fossiliferous Lowerto Middle Silurian continental margin deposits of the Herland
Group. This group unconformably overlies older metasedimentary rocksof the H0yvik Group and the
crystallinebasementoftheDalsfjordSuite. A structuralstylecharacteristic ofthin-skinnedthrust-
foldbeltsislocallypreservedwithintheHerlandGroupon Atby, andthethrust-foldbeltwas
developed in the foreland of the continental margin during the ophiolite accretion. A U-Pb zircon age
of 443 f3 Ma from the ophiolite, the Silurian fossils in the Herland Group and the identification of
theSunnfjordMelangeasanobductionmelangeprovidethebasis for awellconstrainedmodel of
ophiolite accretion in the Scandinavian Caledonides.
Detailedstructuralstudiescombined with recentstrat-
igraphical, geochronological and geochemical studies

  

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

 

Collections: Geosciences