The Dikili-Candarli Volcanics, Western Turkey: Magmatic Interactions as Recorded by Petrographic and Geochemical Features

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2007

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Tubitak Scientific & Technological Research Council Turkey

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Abstract

Located in the northwestern part of the Aegean region, Dikili- Candarli volcanic suite contains products representative for the western Anatolian Miocene volcanism. They can be divided into two main groups: the Dikili and the Candarli groups. The Dikili group is Early - Middle Miocene in age and consists mainly of pyroclastic rocks, andesitic- dacitic lavas, lava breccia, lahar flows and associated sedimentary rocks. The lavas contain disequilibrium phenocrysts assemblages. The Candarli group consists of Upper Miocene - Pliocene lava and sediment associations. The volcanic rocks consist mainly of rhyolitic domes and basaltic trachyandesite- basaltic andesite lavas erupted along the NW - SE- and NE - SW- trending fault systems; the faults controlled the development of the Candarli depression. Major- and trace- element chemistry indicates that the lavas are dominantly high- K, calc- alkaline, intermediate to acidic in composition. Chemical and textural characteristics of the minerals reveal that mixing was a common process in the generation of this magma. In particular, petrography, textural evidence and crystal chemistry of the phenocrysts together with variations in rock compositions indicate that basaltic- basaltic andesitic magma intruded dacite magma and is partially hybridized with it. New petrographic and geochemical data of Dikili-Candarli volcanics are closely similar to those of the active continental margin volcanism which are interpreted as mantle- derived magmas contaminated by crustal materials.

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Karacik, Zekiye/0000-0001-5242-8525

Keywords

volcanism, geochemistry, mineral chemistry, mixing, Turkish Aegean region

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Q4

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Q2

Source

Turkish Journal of Earth Sciences

Volume

16

Issue

4

Start Page

493

End Page

522