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Russian Geology and Geophysics

2002 year, number 3

TYPOMORPHISM OF PARAMAGNETIC RADICALS [CO2]-, [CO3]2- AND [CO3]3- IN NATURAL CARBONATE-APATITES

L. G. Gilinskaya, Yu. N. Zanin, and V. P. Naz'mov
Keywords: Apatite, ESR, radicals, typomorphic properties, Maimecha-Kotui Province
Pages: 297-303

Abstract

Exemplified by the carbonate-apatites from the phosphate-bearing regolith of the Magan and Yraas Massifs of the Maimecha-Kotui Province of ultrabasic-alkaline rocks and carbonatites, the EPR spectra of [CO2]-, [CO3]-, and [CO3]3- radicals observed in them have been shown to be typo-morphic and, thus, appropriate for separating endo-genetic and super-gene varieties.
Analysis of experimental data shows that the spectra in endo-genetic and super-gene apatites are complicated super-positions owing to several individual centres. Computer simulation by means of the ESR1 program permitted us to recognize them and to identify and calculate proportions (weights) of components in complex spectra. It has also been documented that the form of absorption lines in endo-genetic specimens is isotropic, and in super-gene ones, anisotropic, i.e., isotropic and anisotropic EPR spectra of carbonate radicals with corresponding parameters are recorded.
This signature reflects dynamic characteristics of radicals (rotating or fixed in the structure) and is due to molecular bound water, which is always present in super-gene apatites and absent from endo-genetic high-temperature varieties as inferred from data of chemical analysis, IR spectroscopy, and nuclear magnetic resonance.