Single and multiphase inclusions in metapelitic garnets of the Rhodope Metamorphic Province, NE Greece.
Single and multiphase inclusions in garnet porphyroblasts from the diamond-bearing pelitic gneisses were studied by means of combined Raman Spectroscopy and Electron Scanning Microscopy (SEM/EDX). They are either randomly distributed or with preferred orientation within the garnet host and their dimensions vary from less than 5 up to 60 microm. In the single-phase inclusions quartz, rutile, kyanite and graphite dominate. Biotite, zircon, apatite, monazite and allanite are also common. Two types of multiphase inclusions were recognized, hydrous silicate (Type I) and silicate-carbonate (Type II) ones. The carbon-bearing multiphase inclusions predominantly consist of Mg-siderite+graphite+CO(2)+muscovite+quartz formed by a high density carboniferous fluid rich in Fe, Mg, Si and less Ca, Mn, Al and K trapped in the growing garnet in a prograde stage of metamorphism at high-pressure (HP) conditions. The carbon-free multiphase inclusions predominantly consist of biotite+quartz+rutile+/-kyanite+muscovite formed through decompression-dehydration/melting reactions of pre-existing phengite. Single and multiphase inclusions are characterized by polygonal to negative crystal shape formed by dissolution-reprecipitation mechanism between the garnet host and the inclusions during the long lasting cooling period (>100 Ma) of the Kimi Complex.
Mposkos
Evripidis
E
National Technical University of Athens, School of Mining & Metallurgical Engineering, Division of Geosciences, 9 Heroon Politechniou St., GR-15773 Zografou, Greece. mposkos@metal.ntua.gr
Perraki
Maria
M
Palikari
Sarra
S
D000538:Aluminum Silicates / Q000032:analysis; D001031:Apatites / Q000032:analysis; D002245:Carbon Dioxide / Q000032:analysis; D002254:Carbonates / Q000032:analysis; D005296:Ferrous Compounds / Q000032:analysis; D019015:Geologic Sediments / Q000737:chemistry*; D006108:Graphite / Q000032:analysis; D006115:Greece; D008855:Microscopy, Electron, Scanning; D008903:Minerals / Q000032:analysis*; D011791:Quartz / Q000032:analysis; D017640:Silicates / Q000032:analysis; D013059:Spectrum Analysis, Raman; D015040:Zirconium / Q000032:analysis
D000538:Aluminum Silicates; D001031:Apatites; D002254:Carbonates; D005296:Ferrous Compounds; D008903:Minerals; D017640:Silicates; C517971:muscovite; C047410:biotite; C121089:kyanite; D002245:Carbon Dioxide; D011791:Quartz; C003784:zircon; D006108:Graphite; D015040:Zirconium