Raman micro-spectroscopy on diamond,graphite and other carbon polymorphs from the ultrahigh-pressure metamorphic Kimi Complex of the Rhodope Metamorphic Province,NE Greece |
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| Institution: | 1. Geoscience Institute, Goethe University, Altenhoeferallee 1, 60438 Frankfurt am Main, Germany;2. Bayerisches Geoinstitut, University Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany;3. School of Earth Sciences, Wills Memorial Building, The University of Bristol, United Kingdom;4. Section 4.2 Geomechanics and Rheology, GFZ German Research Centre for Geosciences, Telegrafenberg, 14473, Potsdam, Germany;5. ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS) and GEMOC, Department of Earth & Planetary Science, Macquarie University, NSW 2109, Australia;6. KM Diamond Exploration Ltd., 2446 Shadbolt Lane, West Vancouver, British Columbia, V7S 3J1, Canada;1. Dipartimento di Geoscienze, Università di Padova, Via Gradenigo 6, 35131 Padova, Italy;2. Lithosphere Fluid Research Lab, Institute of Geography and Earth Sciences, Eötvös University Budapest (ELTE), Pázmány P. stny. 1/C, H-1117 Budapest, Hungary;3. Department of Geosciences, University of Arkansas, Fayetteville, AR 72701, USA |
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| Abstract: | Raman micro-spectroscopy was applied on carbon inclusions in garnet porphyroblasts from kyanite–biotite–garnet schists of the Rhodope Metamorphic Province (RMP), NE Greece. Diamond and cuboids of poorly to highly ordered graphite were identified either as single phase inclusions or as polyphase inclusions along with CO2 and/or carbonates (calcite/magnesian calcite). Questionable Raman bands that may be assigned to other C-phases (?nanodiamond/?lonsdaleite/?a different C-polymorph) have been observed. The presence of diamond confirms beyond any doubt the ultrahigh-pressure (UHP) metamorphism reported by Mposkos and Kostopoulos 1] E. Mposkos, D. Kostopoulos, Diamond, former coesite and supersilisic garnet in metasedimentary rocks from the Greek Rhodope: a new ultrahigh-pressure metamorphic province established, Earth Planet. Sci. Lett. 192 (2001) 497–506] in the RMP. Cuboid graphite showing variable degree of disordering most probably formed after diamond. The possible involvement of CO2 and or C–O–H fluids in the formation of diamond is discussed. |
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