Identification and valuation of paramagnetic radicals in natural dolomites as an indicator of geological events
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Geological sedimentary dolomite samples from the Superior Proterozoic are studied using electron paramagnetic resonance (EPR) spectroscopy. The complex spectra in the g=2.0 region is composed of Mn2+ lines and signals due to crystallization and radiation-induced defects. Measurements in microwave frequencies of 9.5 GHz (X-band) and 35 GHz (Q-band), and thermal and/or radiation treatments allowed identification of seven paramagnetic radicals in the g=2.0 region: (1) isotropic organic radical; (2) axial SO2−; (3) axial PO20 or PO22−; (4) isotropic CO2−; (5) axial CO2−; (6) axial CO33−; (7) isotropic unknown line. The use of these paramagnetic centres as indicators of geological events is discussed.
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