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Isotopic systematics of the rocks of the Khalyuta carbonatite complex of western Transbaikalia

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Abstract

This paper reports the results of isotopic investigations of the rocks of the Khalyuta carbonatite complex (carbonatites, comagmatic silicate rocks, fenites, and hydrothermal rocks) and host limestones and granites. Pyroxene, amphibole, magnetite, potassium feldspar, apatite, phlogopite, calcite, dolomite, strontianite, celestite, and barite were investigated. The isotopic compositions of C, O, Sr, and S were analyzed. The character of the distribution of oxygen isotopic composition in minerals (carbonates, silicates, phosphates, and oxides) suggests their equilibrium formation. It was supposed that the evolutionary trend of C and O isotopic compositions is mainly related to the processes of differentiation in the melt-fluid system and indicates the absence of significant contamination by carbon and oxygen from a crustal source during rock formation from the magmatic stage to the hydrothermal stage. The isotopic compositions of S and Sr did not change.

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  1. Geological Institute, Siberian Branch, Russian Academy of Sciences, ul. M. Sakh’yanovoi 6a, Ulan-Ude, 670047, Russia

    A. G. Doroshkevich & G. S. Ripp

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  1. A. G. Doroshkevich
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Original Russian Text © A.G. Doroshkevich, G.S. Ripp, 2009, published in Geokhimiya, 2009, No. 12, pp. 1279–1293.

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Doroshkevich, A.G., Ripp, G.S. Isotopic systematics of the rocks of the Khalyuta carbonatite complex of western Transbaikalia. Geochem. Int. 47, 1198–1211 (2009). https://doi.org/10.1134/S0016702909120040

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