Volcanic Stratigraphy and petrology of Susurluk Volcanites (nw Turkey)

Alp Ünal, Ömer Kamaci, Merve Yildiz, Gizem Atabek, Serhat Yarar, Şafak Altunkaynak

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Neogene magmatic activity is widespread in western Anatolia and the Aegean region. Susurluk magmatic domain that is part of the Neogene magmatic belt of western Anatolia comprises various products of Miocene magmatism including plutonic and volcanic associations. These volcanic and plutonic rocks, namely Çataldag pluton and Susurluk volcanites, are spatially and temporally associated with each other. Susurluk Volcanites have two main volcanostratigraphic groups; felsic volcanic rocks (dacitic lavas and related pyroclastic rocks) and intermediate volcanic rocks (andesitictrachyandesitic lavas and associated pyroclastic rocks). The relationships between these volcano-stratigraphic groups and their areal distributions in the study area indicate that the Susurluk volcanites were produced by sub-plinian eruptions of small vents surrounding the Çataldag pluton. Geochemical characteristics of Susurluk volcanites indicate that they are formed from dacites, andesites and trachyandesites. This result is consistent with our field and petrographic investigations. Dacite lavas are high-K calc-alkaline in character, whereas andesites (and trachyandesites) are medium- to high-K calc-alkaline in composition. Both group show enrichment in large ion lithophile elements (LILE) and light rare earth elements (LREE) relative to the high field strength elements (HFSE). They have high initial 87Sr/86Sr ratios (0.707099-0.708785) and low 143Nd/144Nd (0.512407- 0.512575). 206Pb/204Pb and 207Pb/204Pb values vary from 18,831 to 18,952 and 15,696 to 15,704, respectively and εNd values range between-4.0 and-0.72. These similar isotopic characteristics indicate that felsic and intermediate groups belonging to Susurluk Volcanites are co-genetic and they were originated from a common magma derived from enriched mantle (EM II type). Our new major-trace element and Sr-Nd-Pb isotope data also suggest that both mantle enrichment and crustal contamination (combined with fractional crystallization) are required to explain the magmatic evolution of Susurluk volcanites.

Original languageEnglish
Number of pages8
Publication statusPublished - 2012
Event12th International Multidisciplinary Scientific GeoConference and EXPO, SGEM 2012 - Varna, Bulgaria
Duration: 17 Jun 201223 Jun 2012


Conference12th International Multidisciplinary Scientific GeoConference and EXPO, SGEM 2012


  • NW anatolia
  • Petrology
  • Post collisional
  • Sr-nd- pb isotope
  • Susurluk volcanites
  • Volcanic stratigraphy


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