Abstract |
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.
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Authors | Evripidis Mposkos, Maria Perraki, Sarra Palikari |
Journal | Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy
(Spectrochim Acta A Mol Biomol Spectrosc)
Vol. 73
Issue 3
Pg. 477-83
(Aug 2009)
ISSN: 1873-3557 [Electronic] England |
PMID | 19181569
(Publication Type: Journal Article)
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Chemical References |
- Aluminum Silicates
- Apatites
- Carbonates
- Ferrous Compounds
- Minerals
- Silicates
- muscovite
- biotite
- kyanite
- Carbon Dioxide
- Quartz
- zircon
- Graphite
- Zirconium
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Topics |
- Aluminum Silicates
(analysis)
- Apatites
(analysis)
- Carbon Dioxide
(analysis)
- Carbonates
(analysis)
- Ferrous Compounds
(analysis)
- Geologic Sediments
(chemistry)
- Graphite
(analysis)
- Greece
- Microscopy, Electron, Scanning
- Minerals
(analysis)
- Quartz
(analysis)
- Silicates
(analysis)
- Spectrum Analysis, Raman
- Zirconium
(analysis)
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