Monazite is a common mineral in metapelitic rocks including those that underwent ultrahigh-
pressure (UHP) metamorphism. During metamorphic evolution monazite adapts its
composition to the changing mineral assemblage, especially in its heavy rare earth element
contents. We studied this process in diamond-bearing gneiss containing monazite, from
Saxnäs in the Seve Nappe Complex of the Scandinavian Caledonides. Although the rock
has been re-equilibrated under granulite-facies and partial melting conditions, it still …

We studied monazite behaviour in UHP diamond-bearing gneiss from Saxnäs in the Seve
Nappe Complex of the Scandinavian Caledonides (Petrík et al., 2019). Although the rock
has been re-equilibrated under granulite facies and partial melting conditions, the UHP
stage is recorded by the presence of diamond. Microdiamonds occur in situ as inclusions in
garnet, kyanite and zircon, either as single-crystal or polyphase inclusions with Fe-Mg
carbonates, rutile and CO2. Two garnet types have been recognised: dominant Grt I with …