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Boudinage-type Structures at Sørfinnset, Gildeskaal, North Norway

Published online by Cambridge University Press:  01 May 2009

R. Bradshaw  and
M. K. Wells
R. Bradshaw
Affiliation:
Department of Geology, University of Bristol.
M. K. Wells
Affiliation:
Department of Geology, University College, Gower Street, London, W.C. 1.
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Abstract

A layer of massive and lineated hornblende-biotite-gneiss has fractured along ac-joints (perpendicular to the layering and b–lineation), at regular intervals along its lower surface in contact with a thin marble bed. The joints have been opened from below and the marble has penetrated upwards to form intrusive tongues caused by extremely plastic flow folding, as shown by the unbroken banding in the marble. The structure constitutes a variety of one-sided boudinage involving segmentation in the lowest metre or so of the hornblendic rock, while the extreme marble deformation is all accommodated in a few centimetres thickness. The structures must have developed at relatively high temperatures to allow contemporaneous segregation of quartz-feldspar pegmatite veins from the hornblendic rock, and of diopside reaction skarns at the marble junctions.

Type
Articles
Information
Geological Magazine , Volume 101 , Issue 6 , 30 December 1964 , pp. 488 - 495
Copyright
Copyright © Cambridge University Press 1964

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References

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