Highly Fractionated Granites of the Raumid Massif (S. Pamir): Oxygen Isotope and Geochemical Study

Дубинина, Е. О.; Avdeenko, A. S.; Volkov, Vladimir; Kossova, S. А.; Kovalchuk, E. V.

doi:10.1134/s0869591123020029

Petrology

2023

DOI: 10.1134/s0869591123020029

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Highly Fractionated Granites of the Raumid Massif (S. Pamir): Oxygen Isotope and Geochemical Study

Е. О. Дубинина

A. S. Avdeenko

Vladimir Volkov

et al.

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Cited by 2 publications

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Application of Proxy Minerals for Evaluation of the Oxygen Isotope Composition of Felsic Melts

Dubinina,

Aranovich

2023

Petrology

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The problems associated with the use of quartz and zircon as proxy minerals for the reconstruction of δ18O values in acidic melts are considered. It is shown that the correction values Δ(Qz–R) and Δ(R–Zrn) used for the reconstructions are not strictly constant and depend on the mineral composition of the rock and the closure temperature of the oxygen isotopic system of the proxy mineral (Tq, Tz–closure temperature of quartz and zircon, respectively). The applicability of quartz was estimated using an equation for Δ(Qz–R) calculation, which takes into account Tq and the mineral composition of rocks. Using the leucogranites of the Raumid massif (South Pamirs) as an example, it was shown that this correction can be approximated by constant value only under definite conditions. The value of Δ(R–Zrn) was estimated using approach based on calculating the weighted average fractionation coefficient and independent estimates Tz using a zirconium thermometer. It was shown for leucogranite porphyries of the Omsukchan trough that this correction for identical rocks varies from 1.3 to 1.9 ‰, unlike Δ(R–Zrn) = 2.1 determined by the dependence on the SiO2 content (Lackey et al., 2008). The advantages and limitations on the application of quartz and zircon as proxy minerals have been analyzed.

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Application of Proxy Minerals for Evaluation of the Oxygen Isotope Composition of Felsic Melts

Dubinina,

Aranovich

2023

Petrology

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Oxygen Isotopic Fractionation in a Silicate–Carbonate System during the Formation of Rocks of the Kovdor Pluton (Kola Peninsula)

Dubinina,

Morozova,

Rass

et al. 2023

Dokl. Earth Sc.

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The δ18О values of carbonates and silicates (Ol, Phl, Mt) of calcite carbonatites, phoscorites, ijolites, and turjaites of the Kovdor pluton have been studied for the first time to elucidate the role of processes of contamination, retrograde exchange, and high-temperature fractionation in a magmatic system. It is established that no processes of crustal contamination are registered in the isotopic characteristics of silicates and that the δ18О values of olivine, phlogopite, and magnetite are lower relative to the compositions typical of equilibrium with mantle peridotite. At the same time, the carbonates show a complementary enrichment in the 18О isotope relative to the composition of derivative mantle melts. The estimated closure temperature of the O isotopic composition of olivine and the cooling rates of rocks do not support a hypothesis on retrograde isotope exchange. A redistribution of O isotopes between silicate and carbonate constituents of melts in the magmatic system before the origination of the Kovdor pluton and its cooling is suggested. According to the O isotope data, the carbonate constituent at that moment could strongly be dominant (in 1.5–4.5 times) over the silicate one.

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Highly Fractionated Granites of the Raumid Massif (S. Pamir): Oxygen Isotope and Geochemical Study

Cited by 2 publications

References 73 publications

Application of Proxy Minerals for Evaluation of the Oxygen Isotope Composition of Felsic Melts

Application of Proxy Minerals for Evaluation of the Oxygen Isotope Composition of Felsic Melts

Oxygen Isotopic Fractionation in a Silicate–Carbonate System during the Formation of Rocks of the Kovdor Pluton (Kola Peninsula)

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