Summary: Exhumation of high-pressure rocks beneath the Solund Basin,
Western Gneiss Region of Norway
B. R. HACKER,1
T. B. ANDERSEN,2
D. B. ROOT,1
L. MEHL,1
J. M. MATTINSON1
AND J. L. WOODEN3
1
Department of Geological Sciences, University of California, Santa Barbara, CA 93106­9630, USA
(hacker@geology.ucsb.edu)
2
Department of Geology, University of Oslo, PO Box 1047 Blindern 0316, Oslo, Norway
3
U.S. Geological Survey, Menlo Park, CA 94025, USA
ABSTRACT The Solund­Hyllestad­Lavik area affords an excellent opportunity to understand the ultrahigh-pressure
Scandian orogeny because it contains a near-complete record of ophiolite emplacement, high-pressure
metamorphism and large-scale extension. In this area, the Upper Allochthon was intruded by the
c. 434 Ma Sogneskollen granodiorite and thrust eastward over the Middle / Lower Allochthon, probably
in the Wenlockian. The Middle / Lower Allochthon was subducted to c. 50 km depth and the

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