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Isotopic (Sr, Nd, O) systematics of the high Sr-Ba Late Miocene granitoid intrusions from the Caucasian Mineral Waters region

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Abstract

This paper is dedicated to the interpretation of isotope-geochemical data on high Sr-Ba granitoids exemplified by their typical representatives—Late Miocene laccoliths of the Caucasian Mineral Waters (CMW). These massifs are made up of amphibole granites, granosyenites, syenites, and leucogranites, which show particular behavior of Sr, Nd, and O isotope systems. The syenites and granosyenites are characterized by δ18O variations from 8 to 10‰. As compared to them, the amphibole granites have lowered (up to 7‰), while leucogranites, elevated (up to 12.5–13.7‰) oxygen isotope compositions. The (87Sr/86Sr)8.3 ratio in the granitoids accounts for 0.7083–0.7086, whereas σNd(T) varies from −4.2 to −2.1.

The complex isotope—geochemical study was carried on the CMW granitoids, host rocks, and wall-rock metasomatites, which were formed during emplacement and cooling of the intrusive bodies. The mechanism of contamination of a granitoid melt by evaporite-bearing magnesian carbonate sequences was proposed to explain observed isotope characteristics. The P-T conditions of granite formation (800°C and 1.5 kbar), as well as the fraction (up to 17%) and inferred age of contaminant were estimated. The elevated oxygen isotope composition of the leucogranites was considered to be related to the fluid-magmatic interaction.

Isotopic reconstructions showed that all CMW granitoids could be derived from a common parental melt. The amphibole granites occupying the central part of CMW structure most closely approximate composition of the parental melt. The isotope and geochemical signatures of the syenites and granosyenites located at the periphery of the structure could be explained by interaction of felsic granitic melt with magnesian carbonate rocks at depth 5 ± 2 km. The leucogranites of CMW were derived by fractionation of the melt corresponding in composition to the amphibole granites and show no signs of contamination by carbonate rocks. Extremely high δ18O in these rocks could result from fluid-rock interaction during cooling of the intrusive bodies.

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Authors and Affiliations

  1. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, Staromonetnyi per. 35, Moscow, 119017, Russia

    E. O. Dubinina, A. A. Nosova, A. S. Avdeenko & L. Ya. Aranovich

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  1. E. O. Dubinina
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  2. A. A. Nosova
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Original Russian Text © E.O. Dubinina, A.A. Nosova, A.S. Avdeenko, L.Ya. Aranovich, 2010, published in Petrologiya, 2010, Vol. 18, No. 3, pp. 227–256.

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Dubinina, E.O., Nosova, A.A., Avdeenko, A.S. et al. Isotopic (Sr, Nd, O) systematics of the high Sr-Ba Late Miocene granitoid intrusions from the Caucasian Mineral Waters region. Petrology 18, 211–238 (2010). https://doi.org/10.1134/S086959111003001X

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