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Autori: O.G. Iancu, R. Cossio, A. Korsakov, R. Compagnoni, C. Popa
Editorial: Elsevier, Journal of Luminescence, 128, p.1684-1688, 2008.
We propose to investigate the diamonds from the Kokchetav Massif, northern Kazakhstan, which is the best example of diamond-eclogite facies metamorphism, using cathodoluminescence (CL) techniques. CL spectra measurements of diamonds from garnet-pyroxene-quartz rocks and dolomitic marbles, made at 80 K, revealed peaks at 2.156 eV, 2.463 eV, 3.188 eV and a broad band at 2.72÷2.80 eV. Panchromatic and monochromatic diamond images analyzed by CL reveal concentric zones of variable luminescence. This indicates that the diamond crystals grow during several metamorphic stages under Ultra High Pressure (UHP) metamorphism conditions. The inhomogeneous broadening and lower 2.156 eV ZPL peak suggests the presence of a higher concentration of defects and stresses in the rim compared to the core.
Cuvinte cheie: Natural diamond, High pressure crystal growth, Optical emissions, Microstructure