Abstract
We study merwinite and products of its retrograde exsolution (monticellite and spurrite) from marbles of a contact metamorphic aureole in the Kochumdek River area (East Siberia). Cooling to 820–880°C (at P ≈ 0.2 kbar and \({{f}_{{{\text{C}}{{{\text{O}}}_{2}}}}} \gg {{f}_{{{{{\text{H}}}_{{\text{2}}}}{\text{O}}}}}\)) has led to pseudomorphic replacement of merwinite by monticellite-spurrite symplectites. Calculations show that most of the components (Ca, Mg, Mn, Fe, and C) are mobile in the reaction of merwinite exsolution while Si is inert. The inert behavior of silicon controls the process of replacement and restricts it to a few local sites. The formation of the monticellite-spurrite symplectites was maintained by the own resources of metacarbonates. Later, limited amounts of the monticellite-spurrite symplectites formed due to fluorine inputs, possibly, from the cooling intrusion.
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ACKNOWLEDGMENTS
We are sincerely grateful to Academician V.V. Reverdatto and PhD V.Yu. Kolobov for sample collection provided and consultations and an anonymous reviewer for a friendly review of the manuscript and constructive suggestions on its improvement. We thank the Secretary of the Editorial Board of the Journal Proceedings of the Russian Mineralogical Society, PhD D.A. Petrov for help and coordination of activity. We acknowledge colleagues from the Analytical Center of the IGM SB RAS PhD E.N. Nigmatulina and M.V. Khlestov for analytical support of studies.
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This study was supported by state contract of the IGM SB RAS and Russian Foundation for Basic Research, project no. 20-35-90008.
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Translated by I. Melekestseva
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Deviatiiarova, A.S., Sokol, E.V., Kokh, S.N. et al. Monticellite–Spurrite Symplectites: Evidence for a Regressive Stage of the Kochumdek Trap Contact Aureole (Krasnoyarsk Region). Geol. Ore Deposits 64, 584–597 (2022). https://doi.org/10.1134/S1075701522080049
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DOI: https://doi.org/10.1134/S1075701522080049