Geochemistry And 40Ar-39Ar Geochronology Of Miocene Volcanic Rocks From The Karaburun Peninsula- Implications For Amphibole-Bearing Lithospheric Mantle Source, Western Anatolia

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Journal Article: Geochemistry And 40Ar-39Ar Geochronology Of Miocene Volcanic Rocks From The Karaburun Peninsula- Implications For Amphibole-Bearing Lithospheric Mantle Source, Western Anatolia

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 (Yaylakoy, Armagandag and Kocadag volcanics) of ~ 16-18 Ma, and (2) mildly-alkaline basalts (OvacIk 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 OvacIk basalt is geochemically similar to the first stage early-middle Miocene volcanic rocks but differs from NW Anatolian late Miocene alkali basalts. Trace element models indicate that the Kocadag and Armagandag volcanics were produced from the Yaylakoy volcanics by assimilation and fractional crystallization (AFC). Melting models of several trace elements of the most primitive mafic volcanics indicate that their source was metasomatized by subduction-related fluids and was amphibole-bearing garnet-lherzolitic.

Authors 
Cahit HelvacI, E. YalcIn Ersoy, Hasan Sozbilir, Fuat Erkul, okmen Sumer and Bora Uzel








Published Journal 
Journal of Volcanology and Geothermal Research, 2009





DOI 
Not Provided
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Citation

Cahit HelvacI,E. YalcIn Ersoy,Hasan Sozbilir,Fuat Erkul,okmen Sumer,Bora Uzel. 2009. Geochemistry And 40Ar-39Ar Geochronology Of Miocene Volcanic Rocks From The Karaburun Peninsula- Implications For Amphibole-Bearing Lithospheric Mantle Source, Western Anatolia. Journal of Volcanology and Geothermal Research. (!) .