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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:29 |
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Conference: Bucharest University Faculty of Physics 2012 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Preliminary study to establish an EPR spectra database of some natural carbonate minerals from Romania
Authors:
Dorina COVACI (1), O.G. DULIU (2)
Affiliation:
(1) University of Bucharest, Doctoral School of Physics, P.O. Box MG-11, 077125 Magurele (Ilfov), Romania
(2) University of Bucharest, department of Structure of Matter, Earth and Atmospheric Physics and Astrophysics, P.O. Box MG-11, 077125 Magurele (Ilfov), Romania
E-mail
covaci_dorina@yahoo.com
duliu@b.astral.ro
Keywords:
EPR spectroscopy, limestone, marble, Mn2+, provenance.
Abstract:
Limestone and marble, widespread used as building and decorative materials since antiquity, can be found in numerous locations all over the territory of Romania. The aim of this paper is to set up a preliminary study on creating a data base of Electron Paramagnetic Resonance (EPR) spectra of carbonate minerals collected from some well-known Romanian quarries. The EPR spectra are based on the presence of Mn2+ ions as substitutes for Ca2+ ions in crystalline lattice of calcite minerals, resulting in the well known six band spectra of manganese. The study of EPR spectra try to evidence any systematic peculiarities able to be used in further provenance studies. Measurements were performed using a JEOL JES-ME spectrometer, equipped with a modern computerized Data Acquisition System. The one-way ANOVA statistical method was used in order to determine the degree of homogeneity of considered samples with respect of the Mn2+ ions concentration inside each quarry.The experimental results emphasized that the EPR spectra of all samples were almost identical within every quarry, attesting a relative uniform distribution of paramagnetic Mn2+ ions inside the quarries and differences between one quarry to another. Furthermore a database can be created by systematic analyze of carbonate minerals (especially marble) collected from as many as possible Romanian quarries.
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