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The geochronology and origin of mantle sources for late cenozoic intraplate volcanism in the frontal part of the Arabian plate in the Karacadağ neovolcanic area of Turkey. Part 2. The results of geochemical and isotope (Sr-Nd-Pb) studies

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Abstract

A geochemical and isotope-geochemical (Sr-Nd-Pb) study has been carried out for the Karacadağ neovolcanic area, which is situated within the frontal part of the Arabian plate. The obtained data and the results of petrological modeling show that the petrogenesis of parental magmas in the Karacadağ neovolcanic area involved two compositionally different mantle sources; one consisted of garnet-bearing peridotites of the asthenosphere mantle and the other was spinel-bearing peridotites of the enriched subcontinental lithosphere mantle. During early stages in the evolution of the magmatic system, deep-seated asthenospheric magmas were ascending to the surface while intensively interacting with the melts that had been generated at upper mantle depths. The interaction gradually diminished, so that the later effusive rocks mostly have compositions that are similar to those of the primitive asthenospheric magmas. It is shown that a significant (up to 17–18 wt % of the mantle melt) assimilation of crustal material could take place only during the initial phases of the magmatism. Periodic replenishment of the magma chambers by primitive magmas, which resulted in an observable high degree of homogeneity in the composition of young effusive rocks, was also of importance in the petrogenesis of lavas during the evolution of volcanic activity.

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Authors and Affiliations

  1. Department of Geological Engineering, Faculty of Engineering, Istanbul University, Istanbul, Turkey

    M. Keskin

  2. Institute of the Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Russian Academy of Sciences, Staromonetnyi per., 35, Moscow, 119017, Russia

    A. V. Chugaev, V. A. Lebedev & E. V. Sharkov

  3. Department of Geological Engineering, Faculty of Engineering and Architecture, Zeve Campus, Van Yüzüncü Yıl University, Van, Turkey

    V. Oyan

  4. Department of Mining Engineering, Faculty of Engineering and Architecture, Dicle University, Diyarbakır, Turkey

    O. Kavak

Authors
  1. M. Keskin
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  2. A. V. Chugaev
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  3. V. A. Lebedev
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  4. E. V. Sharkov
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  5. V. Oyan
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  6. O. Kavak
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Correspondence to A. V. Chugaev.

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Original Russian Text © M. Keskin, A.V. Chugaev, V.A. Lebedev, E.V. Sharkov, V. Oyan, O. Kavak, 2012, published in Vulkanologiya i Seismologiya, 2012, No. 6, pp. 43–70.

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Keskin, M., Chugaev, A.V., Lebedev, V.A. et al. The geochronology and origin of mantle sources for late cenozoic intraplate volcanism in the frontal part of the Arabian plate in the Karacadağ neovolcanic area of Turkey. Part 2. The results of geochemical and isotope (Sr-Nd-Pb) studies. J. Volcanolog. Seismol. 6, 361–382 (2012). https://doi.org/10.1134/S0742046312060048

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