PRELIMINARY EPR SPECTRA DATABASE OF NATURAL CARBONATE OF SOME ROMANIAN QUARRIES

摘要

Limestone and marble, widespread used as building and decorative materials since antiquity, can be found in numerous locations all over the territory of Romania. As all EPR spectra showed the presence of characteristic Mn~(2+) ions as substitutes for Ca~(2+) ones in crystalline lattice of carbonates, these could be used to evidence any systematic peculiarities able to be used in further provenance studies. Applied to the limestones and marbles collected from three important quarries located in the Parang and Fagaras Mountains (Arnota, Porumbacu de Sus and Mateias) and processed by means of one-way ANOVA statistical analysis, our results emphasized that the EPR spectra of all samples were almost identical within quarries, attesting a relative uniform distribution of paramagnetic Mn~(2+) ions inside the quarries but different from one quarry to another. In this way, an EPR spectra data base created by a systematic analyse of carbonate minerals collected from as many as possible Romanian quarries could be useful in provenance and screening studies.