METHANE IN CARBONATE MELT INCLUSIONS FROM THE ROCK-FORMING MINERALS OF CALC-SILICATE ROCKS FROM THE KOKCHETAV MASSIF

A. O. Mikhno; Михно А. О.; Yu. G. Vinogradova; Виноградова Ю. Г.; S. V. Rashchenko; Ращенко С. В.; A. V. Korsakov; Корсаков А. В.

doi:10.31857/S2686739722602563

METHANE IN CARBONATE MELT INCLUSIONS FROM THE ROCK-FORMING MINERALS OF CALC-SILICATE ROCKS FROM THE KOKCHETAV MASSIF

Authors: Mikhno A.O.¹, Vinogradova Y.G.², Rashchenko S.V.¹, Korsakov A.V.²
Affiliations:
1. Novosibirsk State University
2. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
Issue: Vol 509, No 1 (2023)
Pages: 43-49
Section: GEOCHEMISTRY
Submitted: 14.10.2023
Published: 01.03.2023
URL: https://journal-vniispk.ru/2686-7397/article/view/135742
DOI: https://doi.org/10.31857/S2686739722602563
EDN: https://elibrary.ru/THPABJ
ID: 135742

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Abstract

Secondary inclusions of carbonate melt were studied in garnets and clinopyroxenes from ultrahigh pressure calc-silicate rocks. Secondary inclusions are located in healed cracks associated with large (100 µm – 3 mm) carbonate inclusions in garnet. In some cases, healed cracks intersect inclusions of potassium-bearing clinopyroxene in garnet. Since the amount of K₂O in healed cracks in clinopyroxene-inclusions reaches 0.64 wt. %, it was concluded that their formation and healing occurred at the ultrahigh pressure metamorphic stage. Raman spectra interpretation of secondary carbonate melt inclusions in garnet and clinopyroxene confirmed the presence of the following phases: methane, graphite, calcite, dolomite, muscovite, and phlogopite. The obtained results imply for the ultrahigh-pressure metamorphic stage in the evolution of calc-silicate rocks from the Kokchetav massif, corresponding to the methane accumulation in the carbonate melt.

Keywords

methane, partial melting, metacarbonates, subduction, ultrahigh pressure metamorphism

References

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