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

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.

Naldöken civarındaki Guleman Ofiyoliti’ne ait magmatik kayaçların jeokimyası (GD Elazığ, D Türkiye)

“…Mafik kayalar (gabro-diyabaz) yer yer tonalitik kayaçlar ile kesilmektedir (Şekil 2a-b). Elazığ-Malatya yöresi ve inceleme alanında yaygın yüzlekler veren, esas olarak radyolaryalı çört, çamurtaşı, şeyl ve pelajik kireçtaşlarıyla ilişkili bazaltik dayk ve yastık lavdan oluşan tektonik olarak kaotik bir topluluktan oluşan birim bazı çalışmacılar [28,29] tarafından, Orta-Geç Kretase'de oluşmuş yay ve yay-ardı volkanizması ile temsil edilen Yüksekova Karmaşığı'na dahil edilmiştir. Yıldırım ve Eroğlu [30] ise, inceleme alanında cevher mineralizasyonlarının izlendiği bu birimi Maden Grubu içerisinde değerlendirmiştir.…”