Dicle Bal Akkoca, İsmail YILDIRIM, Mehmet Ali ERTÜRK

Çaybağı ve Palu formasyonu akarsu yataklarının jeokimyasına ait ilk bulgular (Elazığ’ın Doğusu, Türkiye)

Bu çalışmada Elazığ’ın doğusundaki Çaybağı ve Palu Formasyonu’na ait fluvial çökellerin jeokimyası (majör, iz ve nadir toprak elementler) incelenmiştir. İnceleme alanının temel kayaçlarını Guleman Grubu, Elazığ Magmatitleri, Hazar-Maden Grubu, Elazığ Magmatit’lerinden malzeme almış olan Kırkgeçit Formasyonu oluşturmaktadır. Çaybağı Formasyonu kalın fluvial-lakustrin sedimanter istiften, Palu Formasyonu alüvyon yelpazesi, örgülü nehir çökelleri, lakustrin sedimanlardan oluşmaktadır. Örnekler Hacısamdere-Çaybağı kesiti (Ç örnekleri) ve Hacısamdere-Palu kesiti (PL örnekleri) boyunca Çaybağı ve Palu Formasyonları’nın nehir çökellerinden alınmıştır. Zr/Sc ve Th/Sc oranı arasında önemli pozitif korelasyonun görülmesi örneklerin önemli bir sedimanter çevrime maruz kalmadığını göstermektedir. Çaybağı ve Palu örneklerinin benzer jeokimyasal indisleri (Al2O3/TiO2, Ti/Zr, La/Th, La/Sc, Cr/Th, Co/Th, (La/Yb)N, (Gd/Yb)N, LREE/HREE oranları), bunların nötr-bazik kaynak kayaçlarından türediğini göstermektedir., Si’a karşı Na/K diyagramında örnekler yay alanına düşmektedir. La/Sc, Ti/Zr oranları örneklerin okyanus adayayı ortamında depolanmış kayaçlardan türediğini göstermektedir.

Anahtar Kelimeler:

Elazığ, Akarsu yatakları, Jeokimya, Tektonik ortam

First data on the geochemistry of fluvial deposits of Çaybağı and Palu formations (Eastern Elazığ, Turkey)

In this study, the geochemistry (major, trace and rare earth elements) of fluvial deposits of the Çaybağı and Palu Formations, Eastern Elazığ, have been investigated. The basement of the studied basin is composed of the Guleman Group, Elazığ Magmatics, Hazar-Maden Group, and Kırkgeçit Formation which consist of volcanic materials derived from the Elazığ Magmatics. The Çaybağı Formation is composed of thick fluvio-lacustrine sedimentary sequence. Palu Formation consists of alluvial fan deposits and braided river, lacustrine sedimentary deposits. Samples were collected from braided river deposits of Çaybağı and Palu Formation along Hacısamdere–Çaybağı section (Ç-samples) and Hacısamdere-Palu section (PL samples). Significant positive correlation between Zr/Sc and Th/Sc ratios of two sample groups show that the siliciclastic sample groups do not represent considerable sediment recycling. Çaybağı and Palu samples have similar geochemical indices (Al2O3/TiO2, Ti/Zr, La/Th, La/Sc, Cr/Th, Co/Th, (La/Yb)N, (Gd/Yb)N, LREE/HREE ratios) and indicate derivation from intermediate-basic source rocks. In Si vs. Na/K diagram samples plot in arc field and La/Sc and Ti/Zr ratios show that samples were plotted in an oceanic island arc environment.

Keywords:

Elazığ, Fluvial deposits, Geochemistry, Tectonic setting,

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