Collision zone volcanism that had started at Middle Miocene in Eastern and Southeastern Anatolia was examined.
Major, trace and rare earth element analysises, measurements of the strontium isotope (87 Sr/86 Sr) and radiometric dating by
K/Ar method of the samples from various regions were carried out. Diagrams that were plotted according to major element
contents of the volcanic rocks show calcalkalic, alkaline and partly tholeiitic features. Volcanic rocks were named according to
petrography and the results of the chemical analysis. Trace element contents of the volcanics generally fit the mean values of the
upper continental crust, partly the mean values of lower crust and rarely the mean values of the mantle. Sr isotope ratios of the
samples range between 0.70350-0.70640. These results indicate that the crustal slab related to the subducting Arabian plate
contaminated the magma which formed the volcanics. According to K/Ar datings the oldest age of 11.4 + 0.9 my is from Eleşkirt
Kösedağ dacites and the youngest age of 30,000 years are from obsidians of Nemrut Mountains and trachyandesitic lavas of Tendiirek
Mountains. The distribution of the volcanics of the Eastern and Southeastern Anatolia and their volcanologic, geochemical,
petrographic, radiometric, isotopic features are discussed.
Primary Language | English |
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Subjects | Engineering |
Journal Section | Articles |
Authors | |
Publication Date | March 1, 1990 |
Published in Issue | Year 1990 Volume: 110 Issue: 110 |
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