Petrographic and Geochemical Characteristics of Granitoids of the Kaçkar Batholith Outcropping Around Çamlıkaya (İspir/Erzurum) Region

Abstract

Pontid Orogenic Belt, starting from Bulgaria, Turkey-Istranca region extending from the Caucasus represents the East-West trending mountain belt. The study area covers Çamlıkaya village (İspir/Erzurum) and its surroundings in the eastern part of the Pontides (Kaçkar Batholith). Plutonic rocks cropping out in the study area are generally represented by granites and granodiorites. The rocks studied are compositionally varying from calc-alkaline to shoshonitic and have the characteristics of I-type granite. In trace element diagrams normalized to the primary mantle, it is seen that there is enrichment in elements with large ion lithophile elements such as Rb, K, Th, Ba, and depletion in elements with high field strength elements such as Nb, Ti, P and Ta. Negative Nb anomaly observed in granitic rocks is characteristic of subduction-related magmas. In trace element diagrams normalized to chondrite, light rare earth elements show more enrichment than heavy rare earth elements. Negative Eu anomalies are seen. High trace element ratios such as Rb/Sr, Nb/Ta, Zr/Hf, Th/U, Th/Ta and low Nb/La indicate that crustal contamination plays an active role in the formation of these rocks. The studied rocks fall into the volcanic arc and post-collisional zone areas in the tectonic distinction diagrams.

Keywords

• Whole rock geochemistry
• Çamlıkaya- İspir/Erzurum
• Eastern Pontides
• Kaçkar Batholite

Çamlıkaya (İspir/Erzurum) Köyü Çevresinde Yüzeyleyen Kaçkar Batoliti’ne ait Granitoidlerin Petrografik ve Jeokimyasal Özellikleri

Abstract

Pontid Orojenik Kuşağı, Bulgaristan’dan başlayıp, Türkiye-Istranca Bölgesi'nden Küçük Kafkasya'ya kadar uzanan Doğu-Batı uzanımlı dağ kuşağını temsil etmektedir. İnceleme alanı Pontidler’in doğu kesiminde (Kaçkar Batoliti) Çamlıkaya köyü (İspir/Erzurum) ve çevresini kapsamaktadır. İnceleme alanında yüzeyleyen plütonik kayaçlar genel olarak granit ve granodiyoritler ile temsil edilmektedir. İncelenen kayaçlar, bileşimsel olarak kalkalkalen’den şoşonitiğe değişen karakterde ve I-tipi granit özelliğindedir. İlksel mantoya göre normalize edilmiş iz element diyagramlarında, Rb, K, Th, Ba gibi büyük iyon yarıçaplı elementlerde zenginleşme olduğu, Nb, Ti, P ve Ta gibi yüksek alan enerjili elementlerde ise fakirleşme olduğu görülmektedir. Granitik kayaçlarda gözlenen negatif Nb anomalisi yitimle ilişkili magmaların karakteristik özelliğidir. Kondrite göre normalize edilmiş iz element diyagramlarında, hafif nadir toprak elementleri, ağır nadir toprak elementlerine göre daha fazla zenginleşme göstermektedir. Negatif Eu anomalileri görülmektedir. Yüksek Rb/Sr, Nb/Ta, Zr/Hf, Th/U, Th/Ta ve düşük Nb/La gibi iz element oranları bu kayaçların oluşumunda kabuksal kirlenmenin etkin rol oynadığını göstermektedir. İnceleme konusunu oluşturan kayaçlar tektonik ayırtlama diyagramlarında volkanik yay ve çarpışma sonrası bölge alanlarına düşmektedir.

Keywords

• Tüm kayaç jeokimyası
• : Çamlıkaya- İspir/Erzurum
• Doğu Pontidler
• Kaçkar Batoliti

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