A.L. Larikov, EPR CHARACTERISTICS OF FELDSPARS FROM GRANITES OF RUSKA POLYANA MASSIF OF KORSUN-NOVOMYRHOROD PLUTON (UKRAINIAN SHIELD)

https://doi.org/10.15407/mineraljournal.45.01.050

UDC 549.02 (477.46)

EPR CHARACTERISTICS OF FELDSPARS FROM GRANITES

OF RUSKA POLYANA MASSIF OF KORSUN-NOVOMYRHOROD

PLUTON (UKRAINIAN SHIELD)

A.L. Larikov, PhD (Physical and Mathematical), Leading Researcher

E-mail: antonlrkv1@gmail.com; orcid: 0000-0003-2955-494X 

O.V. Zaiats, PhD (Geology), Researcher Fellow

E-mail: zaiats@nas.gov.ua; orcid: 0000-0001-5011-029X 

M.M. Bagmut, PhD (Geology and Mineralogy), Leading Researcher

E-mail: bagmut@nas.gov.ua; orcid: 0000-0002-4309-4970 

M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine

34, Acad. Palladin Ave., Kyiv, Ukraine, 03142

Language: Ukrainian

Mineralogical journal 2023, 45 (1): 50-58

Abstract: The electronic paramagnetic resonance spectra of microfractions of microcline, plagioclase and albite from the Ruska Polyana granites of the Korsun-Novomyrhorod pluton located in the Ukrainian Shield were measured. The results are used together with chemical and X-ray fluorescence analyzes to study the nature of Fe and Mn in the feldspars. It is shown that structural Fe3+ in the microcline and plagioclase reflect the iron content in the melt during crystallization of the granite. At the same time, nonstructural impurities of Fe3+ and Mn2+ in the feldspar monofractions, which are part of hydroxides and carbonates along grain boundaries, do not show correlations with structural impurities of Fe3+ replacing Al3+ ions in microcline and plagioclase, and presumably reflect postcrystallization processes. The ratio of the intensities of the Fe3+ EPR lines in the spectra of microcline indicates that its ordering temperatures are close to 670 K for all studied samples.

Keywords: electronic paramagnetic resonance, feldspars, impurities, ordering, Korsun-Novomyrhorod pluton.

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