Geochemistry and Ar/Ar geochronology of Miocene volcanic rocks from the Karaburun Peninsula: Implications for amphibole-bearing lithospheric mantle source,Western Anatolia |
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| Authors: | Cahit Helvacı E Yalçın Ersoy Hasan Sözbilir Fuat Erkül Ökmen Sümer Bora Uzel |
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| Institution: | 1. Dokuz Eylül Üniversitesi, Mühendislik Fakültesi, Jeoloji Mühendisli?i Bölümü, TR-35160 ?zmir, Türkiye;2. Akdeniz Üniversitesi, Teknik Bilimler Meslek Yüksek Okulu TR-07058, Antalya, Türkiye |
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| Abstract: | New geochemical and 40Ar/39Ar age data are presented from the Neogene volcanic units of the Karaburun Peninsula, the westernmost part of Western Anatolia. The volcanic rocks in the region are associated with Neogene lacustrine deposition and are characterized by (1) olivine-bearing basaltic-andesites to shoshonites (Karaburun volcanics), high-K calc-alkaline andesites, dacites and latites (Yaylaköy, Arma?anda? and Kocada? volcanics) of ~ 16–18 Ma, and (2) mildly-alkaline basalts (Ovac?k basalt) and rhyolites (Urla volcanics) of ~ 11–12 Ma. The first group of rocks is enriched in LILE and LREE with respect to the HREE and HFSE on N-MORB-normalised REE and multi-element spider diagrams. They are comparable geochemically with volcanic rocks in the surrounding regions such as Chios Island and other localities in Western Anatolia. The Ovac?k basalt is geochemically similar to the first stage early–middle Miocene volcanic rocks but differs from NW Anatolian late Miocene alkali basalts. |
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| Keywords: | Karaburun Peninsula Western Anatolia Neogene volcanism lithospheric mantle geochemistry 40Ar/39Ar geochronology |
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