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The significance of primary structures in the Ordovician pillow lava sequence of Western Norway in an understanding of major fold pattern

Published online by Cambridge University Press:  01 May 2009

H. Furnes  and
F. J. Skjerlie
H. Furnes
Affiliation:
Geologisk institutt, avd. A J. Frielesgt. 1 5000 Bergen, Norway
F. J. Skjerlie
Affiliation:
Geologisk institutt, avd. A J. Frielesgt. 1 5000 Bergen, Norway
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Summary

The present paper deals with the Lower Ordovician–Silurian rocks between Fördefjord and Sognefjord on the western coast of Norway. During the Caledonian orogeny this sequence was subjected to several phases of Silurian deformation, the first of which resulted in the formation of a large-scale anticline (the Stavfjord Anticline), which now occupies part of an overthrust unit. On the basis of ‘way-up’ criteria in the partly well-preserved Lower Ordovician pillow lavas it has been possible to determine with some confidence the geometry of the Stavfjord Anticline, its probable regional extension and the position of the axial plane trace. Arcuate deflections in the trend of this axial plane trace are a result of large-scale refolding, the later fold axes having WNW–ESE trends.

Type
Articles
Information
Geological Magazine , Volume 109 , Issue 4 , July 1972 , pp. 315 - 322
Copyright
Copyright © Cambridge University Press 1972

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