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

Yıl 2018, Cilt: 24 Sayı: 3, 527 - 537, 29.06.2018

Dicle Bal Akkoca , İsmail Yıldırım Mehmet Ali Ertürk

Öz

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)

Öz

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.

Anahtar Kelimeler

Elazığ, Fluvial deposits, Geochemistry, Tectonic setting

Kaynakça

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