%0 Journal Article
%T Petrography and petrology of The Y¨¹rekli (Bal£¿kesir) volcanics: an example of post-collisional felsic volcanism in the Biga peninsula (NW Turkey)
%A ZAFER ASLAN
%J -
%D 2018
%X In this study, the aim was to determine the petrography, geochemistry and source of the Y¨¹rekli volcanics (Biga Peninsula, NW Turkey). Tertiary volcanism is widespread in Western Anatolia (NW Turkey), which is an important area where tectonic and magmatic events are observed together. Y¨¹rekli volcanic rocks comprise dacitic lavas and pyroclastics. Dacitic lavas show porphyric and hyaloporphyric texture, and consist of plagioclase, quartz, amphibole, biotite, sanidine and Fe-Ti oxide minerals with apatite and zircon accessory minerals. Petrologically, they have high-potassic and calc-alkaline characteristics. Y¨¹rekli volcanics show enrichment in large ion lithophile elements (LILE) and are depleted in high field strength elements (HFSE) on the N-MORB normalized diagram. On the chondrite-normalized rare earth element (REE) plot, light rare earth elements are enriched but heavy rare earth elements are depleted in the rocks. REE patterns are concave shaped (mean LaN/LuN=16¨C25) and show slight negative Eu anomalies (0.66¨C0.81). Plagioclase, amphibole and biotite fractional crystallisation and crustal assimilation are important in the evolution of the Y¨¹rekli volcanics. According to all data, it can be argued that the Y¨¹rekli volcanics formed in a post-collisional setting, and the parental magmas were derived from the melts of enriched lithospheric mantle
%K Kalk-alkalen kaya£¿lar
%K jeokimya
%K fraksiyonel kristallenme
%K tektonik ortam
%K KB Anadolu
%U http://dergipark.org.tr/bulletinofmre/issue/33397/428294