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Introduction The Western Gneiss Complex (WGC) of Norway is an

Summary: Introduction
The Western Gneiss Complex (WGC) of Norway is an
area of more than 25 000 km2 of dominantly middle Pro-
terozoic gneissic rocks outcropping between Bergen and
Trondheim (Fig. 1). The WGC forms part of the Baltic
shield, which according to Gorbatschev & Gáal (1987)
grew during 4 orogenies between 3.5 and 1.5 Ga, followed
by reworking during the Sveconorwegian and Caledo-
nian events. Tucker et al. (1990) suggest that the Sveco-
norwegian influence was limited to the southern part of
the WGC (Fig.1). Skår & Pedersen (2003) found that the
Sveconorwegian overprint also involved migmatitization
and granite intrusion. During the Scandian phase of the
Caledonian orogeny, the WGC was subjected to high- and
ultra-high-pressure metamorphic conditions, while it
constituted the root zone of the orogen (Andersen &
Jamtveit 1990). In this paper we present new and precise
geochronological evidence from Hisarøya. We use these
data to discuss the age and metamorphic evolution of the
southern part of the WGC.


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


Collections: Geosciences