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

Year 2018, Volume: 11 Issue: 2, 191 - 206, 31.08.2018

Melahat Beyarslan Ebru Okta Mehmet Ali Ertürk

https://doi.org/10.18185/erzifbed.405603

Cited By: 2

Abstract

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

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

Abstract

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.

Keywords

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

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