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Journalof StructuralGeology,Vol. 16, No. 9, pp. 1191to 1203,1994 Copyright 1994ElsevierScienceLtd
 

Summary: Pergamon
Journalof StructuralGeology,Vol. 16, No. 9, pp. 1191to 1203,1994
Copyright© 1994ElsevierScienceLtd
Printedin Great Britain. Allrightsreserved
0191-8141/94$07.00+0.00
0191-8141(93)E0026--H
Deep crustal fabrics and a model for the extensional collapse of the
southwest Norwegian Caledonides
TORGEIR B. ANDERSEN and PER TERJE OSMUNDSEN
Department of Geology, University of Oslo, P.O. Box 1047, 0316 Blindern, Oslo 3, Norway
and
LAURENTJOLIVET
Departementde G6ologie,EcoleNormaleSup6rieure,24rue Lhomond,75231,ParisC6dex05, France
(Received 6 November 1992;accepted in revisedform 29November 1993)
Al~traet--The exhumed deep crustal rocks in the Western Gneiss Region (WGR) of Norway experienced
Caledonian high-pressure metamorphism during the Silurian, Scandian continental collisionbetween Baltica and
Laurentia. The record of coesite-bearing eclogites and pressure-temperature estimates from the WGR
demonstrate extreme burial of these rocks at Pmax. Eclogite tectonite fabrics record coaxial deformation
characterized by bulk horizontal shortening and vertical stretching. Many eclogites, particularly those with a high
content of kyanite, quartz, phengite and clinozoisite have constrictionai fabrics related to vertical stretching.

  

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

 

Collections: Geosciences