Incipient eclogite facies metamorphism in the Moldanubian granulites revealed by mineral inclusions in garnet

摘要: Abstract We investigated several mineral phases and their replacement products which occur as inclusions in garnets from felsic mafic granulites of the Gfohl Unit Moldanubian Zone. The most important inclusions, Ti-rich muscovite omphacite, were used for reconstruction metamorphic history granulites. Some transformed during high-temperature granulite facies metamorphism, partial melting decompression to other phases, so original can only be deduced inclusion morphology reaction products. These have columnar shapes consist K-feldspar + kaolinite, albite + Fe-oxide, plagioclase + Fe-oxide, or albite + K-feldspar, respectively. pseudomorphs with albite/plagioclase a Ca-rich garnet that shows prograde zoning. Pressure–temperature (PT) evolution, derived assemblages based on suggests metamorphism amphibolite through eclogite conditions subsequent overprint exhumation. estimated PT trajectory studied granulites, also host lenses boudins eclogites peridotites, allows complete clockwise path is consistent subduction geotherm prior tectonic amalgamation within continental collisional root.