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Along the west coast of central Norway dunite is found within the crystalline basement of continental gneisses. From previous research is established that these rocks were formed during the Archean and underneath the Greenlandian crust. These dunitic rocks were incorporated within the Baltic crust during the continental collision between Baltica and Laurentia. This collision happened during the Scandian and formed the Caledonides. When these highlands were formed Baltica was under thrusting Laurentia and during this process Laurentic fragments (dunite) were captured in the Baltic continental crust. At Almklovdalen a dunitic body is refertilised at four locations into ultramafic rock. One of these localities (north of Gusdal Quarry) is only recently discovered and forms the subject of this book. Websteritic samples were analysed and the mineral chemistry, petrology, and the geothermobaromteric conditions were determined. The results were compared with the other three locations which were already thoroughly studied and dated. The philosophy used is when a positive correlation can be made the refertilisation event during which the Gusdal websterites were formed could be established.

Refertilisation of the Almklovdalen dunite body: North of Gusdal Quarry, Western Gneiss Region, Norway