ESR studies on calcite encrustation on Fili neotectonic fault, Greece
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Electron spin resonance (ESR) study was done on calcite encrustation on Fili neotectonic fault surface, Greece. Normally such calcite encrustations on fault surfaces are not observed. Significantly, the ESR study has detected the presence of nitrate NO 3 2− radical in this calcite encrustation, havingg ⊥=2.0063±0.0001 and hyperfine coupling constantA ⊥=3.44 mT, the second such detection of nitrate NO 3 2− radical following a sample from Scott Glacier, Antarctica. From isochronal thermal annealing measurement the NO 3 2− radical was found to be quite stable, only fully annealed at 475°C. This study also shows that the ESR, as a tool, can be suitably applied to date the age of formation of the calcite encrustation with SO 3 − as an ESR dating signal by additive γ-ray irradiation. A preliminary estimation indicates the age of formation of calcite precipitation at Fili fault, Greece to be about 5600 years.
KeywordsElectron Spin Resonance Electron Spin Resonance Spectrum Electron Spin Resonance Signal Fili Fault Electron Spin Resonance Measurement
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