First evidence of uhp metamorphism within the Seve Nappe Complex of central Sweden

Abstract

The first evidence of UHP metamorphism in the Seve Nappe Complex of northern Jämtland, central Swedish Caledonides, was discovered in 2010 (Majka & Janák 2011). The UHP parageneses occur within a kyanite-bearing eclogite, forming part of a metabasic dyke that truncates an orogenic garnet peridotite body. This kyanite-eclogite provides key information about the peak UHP metamorphic conditions and subsequent granulite facies overprint. The garnet peridotite body is located close to lake Friningen, northeast of the town Gäddede. The metabasic dyke consists predominantly of a bi-mineralic garnet pyroxenite (Cpx=diopside); however this dominant composition locally "grades" into that of the kyanite-eclogite described here.