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Contrasting origin of two A-type rhyolite series from the Early Permian Nomgon bimodal volcanic association (Southern Mongolia)

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Abstract

A-type rhyolites of contrasting compositions and eruption characters were revealed among two volcanic series of the Early Permian bimodal association in the Nomgon graben. Rhyolites of the lower volcanic series formed extrusions, lava domes, and tuff horizons. They had low FeOt, Zr, Hf, Nb, Ta, Y, and REE concentrations and also a moderately depleted Nd isotope composition (εNd(Т) = 6.7–7.1). Their formation was related to anatexis of the juvenile continental crust, triggered by the thermal effect of mafic magmas. Rhyolites of the upper volcanic series formed extensive lava flows and dikes. Their composition was characterized by high FeOt, Zr, Hf, Nb, Ta, Y, and REE concentrations, and also depleted Nd isotope characteristics (εNd(Т) = 7.7–9.0). These rhyolite melts formed under long-term crystallizational differentiation of basaltoids in the intracrustal magmatic chambers, with limited participation of crustal contamination. The source of magmas for the upper volcanic series was the sublithospheric mantle.

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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. M. Kozlovsky, V. V. Yarmolyuk & E. A. Kudryashova

  2. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, nab. Makarova 2, St. Petersburg, 199034, Russia

    V. M. Savatenkov

  3. Institute of Earth Sciences, St. Petersburg State University, Universitetskaya nab. 7-9, St. Petersburg, 199034, Russia

    V. M. Savatenkov

Authors
  1. A. M. Kozlovsky
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  2. V. V. Yarmolyuk
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  3. V. M. Savatenkov
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  4. E. A. Kudryashova
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Corresponding author

Correspondence to A. M. Kozlovsky.

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Original Russian Text © A.M. Kozlovsky, V.V. Yarmolyuk, V.M. Savatenkov, E.A. Kudryashova, 2017, published in Doklady Akademii Nauk, 2017, Vol. 475, No. 5, pp. 555–559.

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Kozlovsky, A.M., Yarmolyuk, V.V., Savatenkov, V.M. et al. Contrasting origin of two A-type rhyolite series from the Early Permian Nomgon bimodal volcanic association (Southern Mongolia). Dokl. Earth Sc. 475, 914–918 (2017). https://doi.org/10.1134/S1028334X17080141

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  • DOI: https://doi.org/10.1134/S1028334X17080141

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