Petrogenesis and Tectonic Setting of the Quaternary Mafic Alkaline Volcanism Along with the East Anatolian Fault System, Southeastern Anatolia Orogenic Belt (Elazığ)

Abstract

We report the results of a study on Quaternary volcanic rocks cropping out in the Elazığ region. Here the sinistral transform East Anatolian Fault Zone (EAFZ) is one of the important strike-slip faults of Turkey. The Harput mafic alkaline lavas erupted along with strike-slip fault systems in the Elazığ region in southern Turkey. The Quaternary alkali basalts have higher LILE and HFSE contents and lower LILE/HFSE ratios (Ba/Nb = 2.28-10.7), low 87Sr/86Sr (0.703149-0.703915) and high 143Nd/144Nd (0.512751-0.512895), with compositions similar to those of intraplate magmas. They have high Nb contents (34-76.6 ppm), and Nb/La ratios (>1.0). The Nb/La ratios indicate that the lavas are uncontaminated. The positive Sr anomalies and the lack of Eu anomalies imply that plagioclase was not a major fractionating mineral phase. The different data of the Harput volcanics indicate that the volcanism formed at the intersections of the fault systems that belong to the EAFZ and were produced by the lower degree of partial melting (~0.4-4%) of spinel lherzolite.

Keywords

• Alkaline volcanism
• Quaternary
• East Anatolian Fault Zone
• Elazığ

Doğu Anadolu Fay Sistemi Boyunca Gelişen Kuvaterner Mafik Alkali Volkanizmasının Petrojenezi ve Tektonik Konumu, Güneydoğu Anadolu Orojenik Kuşağı (Elazığ)

Abstract

Bu çalışma ile Elazığ Bölgesinde yüzeyleyen Kuvaterner volkanik kayaçlarının inceleme sonuçları verilmiştir. Sol yönlü doğrultu atımlı Doğu Anadolu Fay Zonu (EAFZ) Türkiye’nin en önemli faylarından birisidir. Elazığ bölgesinde EAFZ boyunca mafik alkali özellikte volkanik kayaçlar yüzeylemektedir. Bu volkanik kayaçlar, yüksek LILE ve HFSE içeriklerine ve düşük LILE/HFSE oranlarına (Ba/Nb=2.28-10.7) ve düşük 87Sr/86Sr (0.703149-0.703915) ve yüksek 143Nd/144Nd (0.512751-0.512895) oranlarına sahiptirler. Kimyasal bileşimleri levha içi magmaların bileşimlerine benzemektedirler. Yüksek Nb (34-76.6 ppm), ve Nb/La oranları (>1.0) gösterirler. Nb/La oranları lavların kirlenmemiş veya çok az kirlenmiş olduğunu belirtmektedir. Pozitif Sr anomalisi ve Eu anomalisinin olmaması plajiyoklasların esas fraksiyonlaşma mineral fazı olmadığını belirtir. Farklı veriler Harput volkanitlerinin spinel lerzolitin düşük derecede kısmi ergimesi (~%0.4-4) ile Doğu Anadolu Fay Zonu’na ait fay sistemlerinin kesişme noktalarında oluşmuştur.

Keywords

• Alkali volkanizma
• Kuvaterner
• Doğu Anadolu Fay Zonu
• Elazığ

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