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• W1973006389 startingPage "189" @default.
• W1973006389 abstract "Dolomite, calcite and magnesite were studied by EPR and CL spectroscopy. Mn2+-activated luminescence in calcite and magnesite is characterized by single Gaussian peaks at 16,250 cm−1 (615 nm) and at 15,300 cm−1 (654 nm), respectively. In calcite the Mn2+ content and the normalized EPR area are linearly correlated when the Mn2+ content is < 800 ppm. At higher Mn2+ concentrations, the EPR signal broadens due to ferromagnetic interactions. In contrast to the normalized EPR area, the CL intensity is nonlinearly related to the Mn2+ concentration. Deconvolution of corrected CL spectra from dolomite shows two overlapping peaks at 17,315 cm−1 (578 nm) and 15,270 cm−1 (655 nm). In rare cases only the 15,270 cm−1 (655 nm) Gaussian peak is present. The CL peak at 17,315 cm−1 (578 nm, Ia) is due to Mn2+ in the Ca site and the peak at 15,270 cm−1 (655 nm, Ib) to Mn2+ in the Mg position. The Mn2+ content in dolomite is linearly correlated with the normalized EPR areas of the two sites. The distribution ratio (KD) of Mn2+ in the two sites of dolomite, i.e. the Ca and the Mg position, was determined by EPR and CL spectroscopy. A linear correlation exists between KD from EPR and the intensity ratio (IbIa from CL. CL spectroscopy is thus an appropriate method to determine KD in dolomite. Evaporitic dolomites may be differentiated from non-evaporitic dolomites by their KD-values." @default.
• W1973006389 created "2016-06-24" @default.
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• W1973006389 date "1993-02-01" @default.
• W1973006389 modified "2023-09-30" @default.
• W1973006389 title "Mn2+-activated luminescence in dolomite, calcite and magnesite: quantitative determination of manganese and site distribution by EPR and CL spectroscopy" @default.
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• W1973006389 doi "https://doi.org/10.1016/0009-2541(93)90150-h" @default.
• W1973006389 hasPublicationYear "1993" @default.
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