The Lillevik Dyke Complex, Narvik: Geochemistry and Tectonic Implications of a Probable Ophiolite Fragment in the Caledonides of the Ofoten Region, North Norway
The Lillevik dyke complex, Narvik: geochemistry and tectonic implications of a probable ophiolite fragment in the Caledonides of the Ofoten region, North Norway ROGNVALD BOYD Boyd, R.: The Lillevik dyke complex, Narvik: geochemistry and tectonic implications of a probable ophiolite fragment in the Caledonides of the Ofoten region, North Norway. Norsk Geologisk Tidsskrift, Vol. 63, pp. 39-54. Oslo 1983, ISSN 0029-196X. The Lillevik dyke complex occurs in an allochthonous unit and shows field relationships indicative of a transition from the mafic cumulate to the sheeted dyke zone in a segment of an ophiolite. Major and trace element chemistry confirm the MORB character of most of the diabases. Certain diabase, gabbro and trondhjemite dykes have REE patterns suggesting a later stage of ocean-island volcanism. The Lillevik complex and equivalent bodies along strike on the eastern limb of the Ofoten synform are a probable source for the mafic facies of the overlying Elvenes Conglomerate. Analogies with other areas suggest that the Lillevik complex was obducted during the Finnmarkian orogeny. R. Boyd, Norges geologiske undersøkelse, Postboks 3006, N-7001 Trondheim, Norway. The topic of this paper is a tectonically bounded gen Groups is marked by a conglomerate hori lens, consisting of gabbro cut by diabase and zon, the Elvenes Conglomerate, which consists gabbroic dykes and by leucocratic veins, which is mainly of matrix-supported cobbles of meta exposed on a shore section within the town of trondhjemite, quartzite and dolomitic marble in Narvik in North Norway. The section Iies in the a matrix of calcareous mica schist (Foslie 1941, upperrnost part of the Narvik Group of Gustav Gustavson 1966); this unit is currently being son (1966, 1972) (Fig.
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