Güneyköy civarındaki (GD Elazığ, D Türkiye) Volkanik kayaçların (Yüksekova Karmaşığı) Jeokimyası

Abstract

Güneydoğu Anadolu Sütur Kuşağında, Yüksekova Karmaşığı birimine ait volkanik kayaçların Güneyköy çevresindeki yüzlekleri bu çalışmada ele alınmıştır. Bu volkanik kayaçlar bordo ve yeşilimsi renk tonlarındadır. Kayaçlar masif görünümlü ve yer yer de belirgin yastık yapısındadır. Yer yer spilitleşmeler gösteren volkanitler bazaltik bileşimlidirler. Bazik kayaçlar genel olarak, plajiyoklas ve psödömorf olivin minerallerinden oluşmaktadırlar. Kayaçlarda, hiyalomikrolitik porfirik, amigdaloidal ve sferulitik dokular yaygındır. Kalsit, epidot oluşumları da mevcuttur. Volkanik kayaçlar bazik bileşimli ve toleyitik karakterlidir. İkili değişim diyagramlarında kayaç örnekleri hareketsiz element olarak Zr’a karşı; CaO, MgO, Cr2O3 ve Sc ile negatif; TiO2, P2O5, Y, Nb, Hf ve Th ile ise pozitif korelasyon göstermektedir ki, bu ilişkiler fraksiyonel kristalleşmeye işaret eder. Kayaç örneklerinin N-tipi Okyanus Ortası Sırtı Bazaltına (N-MORB) normalize edilmiş iz element dağılımları; LIL Elementler bakımından MORB a göre zenginleşme, HFSE ler bakımından ise MORB çizgisine paralel fakat nisbeten fakirleşme gösterir. Örneklerin kondrite normalize edilmiş diyagramları ise kondrite göre paralel ve yaklaşık düz bir trend sergilemektedir. Negatif Nb anomalisiyle birlikte, tüketilmiş HFSE ve zenginleşmiş LIL element deseni yitim katkısına işaret etmektedir. Sonuç olarak, Güneyköy (Elazığ) çevresi volkanik kayaç örnekleri bir okyanus içi yay ortamında oluşmuşlardır.

Keywords

• Güneyköy (GD Elazığ)
• Yüksekova Kompleksi
• Volkanik Kayaç
• Jeokimya
• Okyanus içi yay

Project Number

MF-17.16

Geochemistry of the Volcanic Rocks of the Yüksekova Complex near Güneyköy (SE of Elazığ, E Turkey)

Abstract

Some of the volcanic products of the Yüksekova Complex crop out in the Güneyköy (SE Elazığ, E Turkey) area in the Southeast Anatolian Suture Belt. This study reports the whole rock geochemical data of the volcanics of the Upper Cretaceous Yüksekova Complex around Güneyköy. The volcanic rocks are burgundy and greenish in color. The rocks are massive or have distinct pillow structure. The volcanic rocks occasionally showing spilitization have basaltic composition and tholeiitic character. The rocks are mainly composed of plagioclases and to a lesser extent clinopyroxene and pseudomorphic olivine minerals. In thin-sections microlytic and hyalomicrolytic porphyritic textures, as well as spherulitic and amygdaloidal textures are common. The secondary minerals are calcite and epidote. In binary diagrams, the Zr, is considered as immobile and index element; show positive correlation with Al2O3, TiO2, Nb, Y, Hf, whereas show negative correlation with CaO showing plagioclase, clinopyroxene, olivine and Fe-Ti oxide fractionation during the evolution of the volcanics. N-type mid-ocean ridge basalt-normalized trace element distributions of the rock samples indicate enrichment in large-ion lithophile elements (LILE) and Th, and negative anomalies in Ta, Nb, Ti and P elements. The chondrite normalized diagrams of the samples show an approximately parallel and straight trend (LaN/SmN: 0.93-2.13; LaN/LuN: 0.23-0.89), suggesting a similar source for the volcanic rocks. The geochemical implications such as negative Nb anomaly, depleted HFS element abundances and enriched LIL element pattern indicate the contribution of a subducting plate. As a result, the volcanites in the near of Güneyköy (Elazığ) are members of the Yüksekova Complex and were formed in an intra-oceanic arc environment within the Southern Branch of Neotethys.

Keywords

• Güneyköy (SE Elazığ)
• Yüksekova Complex
• Volcanic Rock
• Geochemistry
• Intra-Oceanic arc

Supporting Institution

Fırat Üniversitesi-FÜBAP

Project Number

MF-17.16

Thanks

This study was financially supported in part by Fırat University (FUBAP-MF.17.16) project. Prof. Dr. M. C. Goncuoglu is gratefully acknowledged for his comments and suggestions on the manuscript.

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