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Isotope Characteristics of Carbonates from Rocks of Greenstone Belts as an Indicator of a Possible Source of Fluids in Precambrian Granulite Complexes: An Example from the Giyani Greenstone Belt and the Limpopo Granulite Complex, South Africa

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Abstract

Data on the carbon and oxygen isotopic composition of carbonates from the rocks of the Giyani greenstone belt, Kaapvaal craton, South Africa are presented. This belt is immediately adjacent to the Hout River Shear Zone, along which the Southern Marginal Zone (SMZ) of the Limpopo granulite complex is overthrusted onto the Kaapvaal craton. The δ13C values are –2.1 and –2.2‰ for carbonates from two metapelite samples, –5.1‰ for a meta ultrabasite sample, and –7.1 and –7.7‰ for two metabasite samples, respectively. The δ18О values are 17.1 and 17.5‰ for carbonates from the metapelites, 14.3‰ for carbonates from the metaultrabasite, and 12.9 and 13.0‰ for carbonates from the metabasites. The comparison of the data obtained to the published data on the isotopic composition of carbonates from the rocks of the different greenstone belts indicates both hydrothermal (in the metabasites and the metaultrabasite) and sedimentary (in the metapelites) origins of the carbonate material in the rocks studied. Based on the comparison of these data to δ13C of magnesite that formed in ultrabasic granulites during the interaction of the Limpopo complex with the craton, the graphite and fluid inclusions in leucocratic garnet-bearing granitoids that transported fluids, and the carbon isotopic composition of graphite from metapelites of the SMZ, it is concluded that the carbon source was located outside the SMZ and represented a heterogeneous carbonate-bearing lithologies. It could be carbonate-bearing volcanogenic–sedimentary sequences of the greenstone belts of the Kaapvaal craton, which underwent prograde metamorphism during the interaction with the SMZ granulites.

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Funding

This work was supported by the Russian Science Foundation (grant no. 18–17–00206). It was conducted in part within the scope of a State Task (project no. АААА–А18–118020590148–3) of the Institute of Experimental Mineralogy, Russian Academy of Sciences, for 2019–2021, and in the context of cooperation with the University of Johannesburg (South Africa). Methods of stable isotope investigation were developed and supported under the state assignment of IGM SB RAS.

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Authors and Affiliations

  1. Korzhinskii Institute of Experimental Mineralogy, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    A. S. Mityaev, O. G. Safonov, D. A. Varlamov &  L. Y. Aranovich

  2. Moscow State University, 119991, Moscow, Russia

    A. S. Mityaev & O. G. Safonov

  3. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    V. N. Reutsky & O. P. Izokh

  4. University of Johannesburg, Johannesburg, South Africa

    O. G. Safonov & D. D. van Reenen

  5. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, 119017, Moscow, Russia

    V. M. Kozlovskii &  L. Y. Aranovich

Authors
  1. A. S. Mityaev
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  2. O. G. Safonov
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  3. V. N. Reutsky
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  4. O. P. Izokh
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  5. D. A. Varlamov
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  6. V. M. Kozlovskii
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  7. D. D. van Reenen
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  8. L. Y. Aranovich
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Correspondence to A. S. Mityaev.

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Translated by L. Mukhortova

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Mityaev, A.S., Safonov, O.G., Reutsky, V.N. et al. Isotope Characteristics of Carbonates from Rocks of Greenstone Belts as an Indicator of a Possible Source of Fluids in Precambrian Granulite Complexes: An Example from the Giyani Greenstone Belt and the Limpopo Granulite Complex, South Africa. Dokl. Earth Sc. 492, 342–345 (2020). https://doi.org/10.1134/S1028334X20050153

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  • DOI: https://doi.org/10.1134/S1028334X20050153

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