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Lead Isotope composition and origin of the quaternary lavas of Elbrus Volcano, the Greater Caucasus: High-precision MC-ICP-MS data

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Abstract

A systematic study of Pb isotope composition was carried out for Elbrus Volcano, one of the Europe’s largest volcanoes, using high-precision method of multi-collector inductively coupled plasma mass spectrometry. The measurement error of Pb isotope ratios was estimated from the results of replicate analyses of international BCR-1 and AGV-1 standards as ±0.03% (±2SD). The study of a representative collection showed that dacites of all three phases of the Elbrus eruptive activity are characterized by relatively small-scale variations of Pb isotope composition: 206Pb/204Pb 18.621–18.670, 207Pb/204Pb 15.636–15.659, and 208Pb/204Pb 38.762–38.845. New Pb isotope geochemical characteristics in combination with existing Sr-Nd data indicate that the parental magmas of Elbrus are of mixed mantle-crust origin. They were formed by interaction of mantle-derived melts with continental crust of the Greater Caucasus during continental collision between the Eurasian, Arabian, Turkish, and Iranian plates.

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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

    A. V. Chugaev, I. V. Chernyshev, V. A. Lebedev & A. V. Eremina

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  1. A. V. Chugaev
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  2. I. V. Chernyshev
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  3. V. A. Lebedev
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  4. A. V. Eremina
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Correspondence to A. V. Chugaev.

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Original Russian Text © A.V. Chugaev, I.V. Chernyshev, V.A. Lebedev, A.V. Eremina, 2013, published in Petrologiya, 2013, Vol. 21, No. 1, pp. 20–33.

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Chugaev, A.V., Chernyshev, I.V., Lebedev, V.A. et al. Lead Isotope composition and origin of the quaternary lavas of Elbrus Volcano, the Greater Caucasus: High-precision MC-ICP-MS data. Petrology 21, 16–27 (2013). https://doi.org/10.1134/S0869591113010037

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