Melahat BEYARSLAN, Ebru OKTA, Mehmet Ali ERTÜRK

Kale (Malatya) İlçesi Çevresindeki Geç Kretase Yaşlı Yay Magmatitlerinin Jeokimyasal Özellikleri

Bu çalışma ile Kale ilçesi (Malatya) çevresinde yüzeyleyen Geç Kretase yaşlı Elazığ Magmatitleri’ne ait kayaçlar jeokimyasal özellikleri bakımından incelenmektedir. Çalışılan bölgede, Elazığ Magmatitleri dışında Geç Kretase yaşlı İspendere Ofiyolitleri ve Orta Eosen yaşlı Maden Karmaşığı ile yine Orta Eosen ve daha genç yaşlı sedimanter kayaçlar yüzeylemektedir. Yüzey kayaçları bazalttan riyolite; derinlik kayaçları ise gabrodan tonalit ve granite kadar değişen bileşimsel aralıklar sunmaktadır. Arazi çalışmaları sırasında, plutonik kayaçların yüzey kayaçlarını kestiği gözlenmektedir. Jeokimyasal veriler, bazaltlar ve gabro-tonalit yönsemesini gösteren plutonik kayaçların düşük K’lu toleyit, granit-granodiyorit bileşimli kayaçların kalk-alkali ve monzonitik bileşimli kayaçların ise şoşonitik karakterli olduğunu göstermektedir. Bölgede yaygın olarak yüzeyleyen Geç Kretase yaşlı Elazığ Magmatitleri’nin bir parçası olan magmatitler, Geç Kretase’de kuzey yönlü bir yitimle kapanmakta olan Neotetis Okyanusu’nun okyanus içi yitim zonu üzerinde oluşmuş ada yayı ürünleridir.

Anahtar Kelimeler:

Elazığ Magmatitleri, Ada yayı, Petrografi, Jeokimya, Malatya, Kale, Malatya

Geochemical Characteristics of the Late Cretaceous Arc Magmatics Around the Town of Kale (Malatya)

By this study, the rocks outcropping around the town of Kale (Malatya), which are also a part of the Elazığ Magmatites, have been investigated in terms of their geochemical features. Apart from the Elazığ magmatites, the other units outcropping around the region are the Late Cretaceous Ispendere Ophiolite, the Middle Eocene Maden Complex and the Middle Eocene and younger sedimentary rocks. The volcanic rocks display a compositional range from basalt to rhyolite, whereas the plutonic rocks from gabbro to tonalite and granite. During the field investigations, it is observed that the plutonic rocks intruded into the volcanic rocks. The geochemical data show that the basalts and plutonic rocks, displaying gabbro-tonalite trend, are low-K tholeiitic in character, whereas granite-granodiorites and monzonites have in turn calc-alkaline and shoshonitic characteristics. Investigated magmatic rocks, which are a part of the widespread Late Cretaceous Elazığ Magmatites, are the products of an island arc formed above a northward-dipping intra oceanic subduction zone during the Late Cretaceous closure of the Neotethyan Ocean.

Keywords:

Island Arc, Elazığ Magmatics, Petrography, Geochemistry, Kale, Malatya,

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