Mehmet Ali ERTÜRK, Hatice KARA, Abdullah SAR

Doğanşehir-Eskiköy (Malatya) Bölgesindeki Neojen Yaşlı (?) Volkanik Kayaçların Petrografik, Jeokimyasal ve Petrolojik Özellikleri

Bu çalışmada Eskiköy-Doğanşehir (Malatya) bölgesindeki Neojen (?) yaşlı volkanik kayaçlarının petrografik ve jeokimyasal özellikleri incelenmiştir. Çalışma bölgesi Permo-Triyas yaşlı Malatya metamorfitleri, Üst Kretase yaşlı Berit ofiyoliti, Erken-Orta Eosen yaşlı Doğanşehir, Polat-Beğre granitoidi, Neojen (?) yaşlı volkanitler ve Plio-Kuvaterner yaşlı alüvyonlardan oluşmaktadır. İncelenen volkanik kayaçlar Permo-Triyas yaşlı Malatya metamorfik kayaçlarını sıcak dokanakla keserek yüzeylemişlerdir. Dasit ve riyolit bileşimindeki volkanitler başlıca plajiyoklas, sanidin, kuvars, biyotit ve amfibol minerallerinden oluşurlar. Söz konusu volkanitler kalk-alkali ve yüksek-K kalk-alkali karaktere sahiptirler. Primitif mantoya normalize edilmiş çoklu element ve kondrite normalize edilmiş nadir toprak element değişim diyagramında büyük iyon yarıçaplı litofil elementleri ve hafif nadir toprak elementleri zenginleşme göstermektedir ve yitime bağlı olarak okyanusal kabuktan türeyen çözeltiler tarafından metasomatize edilmiş bir mantodan kaynaklandığı düşünülmektedir.

Anahtar Kelimeler:

Jeokimya, Malatya, Neojen volkanitleri, Petrografi

Petrographic, Geochemical and Petrological Characteristics of Neogene (?) Volcanicsin the Doğanşehir-Eskiköy (Malatya) Region

In this study, petrographic and geochemical properties of Neogene (?)volcanic rocks in Eskiköy-Doğanşehir (Malatya) region were investigated. The study area consists of Permo-Triassic Malatya metamorphics, Late Cretaceous Berite ophiolite, Early-Middle Eocene Doğanşehir, Polat-Beğre granitoids, Neogene (?) volcanics, and Plio-Quaternary alluviums. The investigated volcanic rocks exposed the Permo-Triassic Malatya metamorphic rocks by cutting with hot contact. Volcanics in dacite and rhyolite composition mainly consist of plagioclase, sanidine, quartz, biotite and amphibole minerals. These volcanics have calc-alkali and high-K calc-alkali characters. In the primitive mantle normalized multi-element and chondrite-normalized rare earth element variation diagram, large ion lithophile elements and light rare earth elements show enrichment and are thought to be caused by a mantle metasomatized by solutions derived from the oceanic crust due to subduction.

Keywords:

Geochemistry, Malatya, Neogene volcanics, Petrography,

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