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Exhuming Norwegian ultrahigh-pressure rocks: Overprinting extensional structures and the role
 

Summary: Exhuming Norwegian ultrahigh-pressure rocks:
Overprinting extensional structures and the role
of the Nordfjord-Sogn Detachment Zone
Scott M. Johnston,1,2
Bradley R. Hacker,1
and Torgeir B. Andersen3
Received 2 December 2005; revised 29 March 2007; accepted 11 June 2007; published 6 September 2007.
[1] The Nordfjord-Sogn Detachment Zone (NSDZ)
is widely cited as one of the primary structures
responsible for the exhumation of Norwegian
(ultra)high-pressure (UHP) rocks. Here we review
data from the considerable volume of research
describing this shear zone, and compile a strike-
parallel cross section along the NSDZ from the
Solund Basin in the south to the Sørøyane UHP
domain in the north. This cross section highlights
several previously unrecognized patterns, revealing a
shear zone with top-to-the-west asymmetric fabrics
that (1) initiated at amphibolite facies, (2) overprints
metamorphic breaks and tectonostratigraphic

  

Source: Andersen, Torgeir Bjørge - Centre for Physics of Geological Processes & Department of Geosciences, Universitetet i Oslo
Hacker, Bradley R. - Hacker, Bradley R. - Department of Geological Sciences, University of California at Santa Barbara

 

Collections: Geosciences