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Trace element distribution in mineral inclusions in zoned garnets from eclogites of the Atbashi Range (South Tianshan)

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Abstract

Ion microprobe data for minerals from the eclogites of the Atbashi Range (South Tianshan) constrain the distribution of trace (Rb, Sr, Ba, Cr, V, Zr, Hf, Nb, Ta, U, Th, and Y) and rare-earth elements (REE) in zoned garnets and mineral inclusions in them. This study showed that garnets from the Atbashi eclogites are the main hosts for heavy REE; epidotes are important hosts for REE, Y, Sr, Th, and U; and omphacites are depleted in almost all trace elements compared with the bulk-rock compositions. Garnet, as well as epidote and omphacite inclusions exhibit systematic rimward depletion in a number of trace elements, which is related to the depletion of the rock matrix in these elements during crystallization. Deviations from this trend, including the enrichment of garnet rims in HREE and strong variations in the REE contents of garnets and mineral inclusions, can be explained by metamorphic reactions involving the destabilization of REE-bearing minerals. Our data suggest that the mobility of trace elements under eclogites-facies conditions is mainly controlled by the stability of certain minerals.

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Authors and Affiliations

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

    N. I. Volkova, S. V. Kovyazin, S. I. Stupakov & V. A. Simonov

  2. National Research Tomsk State University, pr. Lenin 36, Tomsk, 634050, Russia

    N. I. Volkova

  3. Institute of Geology, National Academy of Sciences of the Kyrgyz Republic, pr. Erkindik 30, Bishkek, 720481, Kyrgyz Republic

    K. S. Sakiev

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  1. N. I. Volkova
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  2. S. V. Kovyazin
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  3. S. I. Stupakov
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  4. V. A. Simonov
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  5. K. S. Sakiev
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Correspondence to N. I. Volkova.

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Original Russian Text © N.I. Volkova, S.V. Kovyazin, S.I. Stupakov, V.A. Simonov, K.S. Sakiev, 2014, published in Geokhimiya, 2014, No. 11, pp. 1001–1024.

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Volkova, N.I., Kovyazin, S.V., Stupakov, S.I. et al. Trace element distribution in mineral inclusions in zoned garnets from eclogites of the Atbashi Range (South Tianshan). Geochem. Int. 52, 939–961 (2014). https://doi.org/10.1134/S0016702914090092

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  • DOI: https://doi.org/10.1134/S0016702914090092

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