Minerals of spinel group from izrandites of the Alexandrovsky polymetamorphic complex in the Southern Urals
https://doi.org/10.24930/2500-302X-2024-24-6-1084-1102
Abstract
Object of research. Spinelides of izrandites of the Aleksandrov polymetamorphic complex in the Southern Urals. Purpose of research. Studying of composition of spinel group minerals and coexisting ilmenite in single grains and in different phases in unmixing structures after decomposition of solid solutions, reconstruction of primary compositions of oxide minerals and comparison with the same minerals from Ural-Alaskan-type complexes having an ankaramine affinity. Methods. The study was performed on a Tescan Mira scanning electron microscope at the “Geoanalitic” Center of Common Use (Ekaterinburg). The images were obtained in backscattered electron mode. The composition of minerals was determined in points and using an area scanning facilities of SEM for the unmixing structures of spinels. Results. Chrome spinel containing more than 25 wt % Cr2O3 and corresponding to the earliest stage of crystallization has been discovered in izrandites of the Alexandrovsky polymetamorphic complex in the Southern Urals. The several stages of Cr-Fe-Ti-oxide and rock-forming silicates crystallization were determined. It was shown that during cooling and subsolidus transformation, oxide minerals undergo complex multistage decomposition of the solid solution with the formation of phases enriched in aluminum and ferric iron in equilibrium with ilmenite. The compositions of these phases are distributed along the Cr-spinel solvus. The earliest primary hypersolvus spinels form inclusions in olivine and clinopyroxene. They are characterized by 3–4 wt % of TiO2 and 15–20 wt % of Cr2O3. The late spinel forms inclusions in kaersutite and are situated in the intergranular space. Their compositions are poor in Cr2O3 < 7%, but rich in TiO2 10–25 wt %, corresponding to titanomagnetite and ulvospinel. Conclusions. The composition of rocks, silicate minerals and Cr-Fe-Ti-oxides confirm the similarity of izrandites with ankaramites and tilaites from complexes of Ural-Alaskan-type. High titanium content in izrandites in comparison with similar rocks of the Ural Platinum Belt reflect the geochemical peculiarities of the primary melt which was formed by melting of the metasomatically transformed Mesoproterozoic mantle under the influence of a plume.
Supporting agencies: The study was supported by the grant of the Russian Science Foundation grant no. 23-17-00224. https://rscf.ru/project/23-17-00224/
About the Authors
S. V. Pribavkin
A.N. Zavaritsky Institute of Geology and Geochemistry, UB RAS
Russian Federation
Russian Federation
Sergey V. Pribavkin
15 Academician Vonsovsky st., Ekaterinburg 620110
A. P. Biryuzova
A.N. Zavaritsky Institute of Geology and Geochemistry, UB RAS
Russian Federation
Russian Federation
Anna P. Biryuzova
15 Academician Vonsovsky st., Ekaterinburg 620110
E. V. Pushkarev
A.N. Zavaritsky Institute of Geology and Geochemistry, UB RAS
Russian Federation
Russian Federation
Evgeney V. Pushkarev
15 Academician Vonsovsky st., Ekaterinburg 620110
I. A. Gottman
A.N. Zavaritsky Institute of Geology and Geochemistry, UB RAS
Russian Federation
Russian Federation
Irina A. Gottman
15 Academician Vonsovsky st., Ekaterinburg 620110
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Review
For citations:
Pribavkin S.V., Biryuzova A.P., Pushkarev E.V., Gottman I.A. Minerals of spinel group from izrandites of the Alexandrovsky polymetamorphic complex in the Southern Urals. LITHOSPHERE (Russia). 2024;24(6):1084-1102. (In Russ.) https://doi.org/10.24930/2500-302X-2024-24-6-1084-1102
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