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

M. Keskin, A. V. Chugaev, V. A. Lebedev, E. V. Sharkov, V. Oyan, O. Kavak

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28 Citations (Scopus)

Abstract

A geochemical and isotope-geochemical (Sr-Nd-Pb) study has been carried out for the Karacadaǧ 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 Karacadaǧ 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.

Original languageEnglish
Pages (from-to)361-382
Number of pages22
JournalJournal of Volcanology and Seismology
Volume6
Issue number6
DOIs
Publication statusPublished - Nov 2012
Externally publishedYes

Funding

M. Keskin also expresses his thanks to the Istanbul University Research Fund for financial support making it possible for him to take part in international sympo sia, via projects UDP 603, UDP 6673, and BYP 4721. ACKNOWLEDGMENTS This work was supported by Basic Research Program no. 4 of the Presidium of the Russian Academy of Sci ences, by a grant from the Russian Foundation for Basic Research (no. 11 05 00012), and by the Scientific and Technological Research Council of Turkey (i.e. TUBI TAK project no. 108Y222).

FundersFunder number
Istanbul University Research FundUDP 6673, UDP 603, BYP 4721
Russian Academy of Sci ences
Russian Foundation for Basic Research11 05 00012
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu108Y222

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