Erzurum Bölgesinde Palandöken Volkanik Kayaçlarının Petrografik ve Jeokimyasal Özellikleri, Doğu Anadolu, Türkiye

Yıl 2020, Cilt: 6 Sayı: 2, 42 - 60, 31.12.2020

Sevcan Kürüm Nevruz Özdemir

https://doi.org/10.29132/ijpas.814660

Cited By: 3

Öz

Palandöken volkanitleri, Afrika, Arabistan ve Avrasya levhalarının yakınsama-çarpışması sonucunda oluşan Doğu Anadolu Volkanik Provens sisteminin bir parçasıdır. Bu volkanitler, lav akıntıları ve bunlarla arakatmanlı olarak bulunan ve kalın bir istif oluşturan piroklastiklerden oluşmuştur. Jeokimyasal veriler, petrogafik verilerle uyumlu olarak, lavların silika içeriklerine göre düşük silikalı bazaltlardan yüksek silikalı dasitlere kadar değişen bileşimlerde olduğunu gösterir. Kalkalkalen-toleyitik ve sodik-potasik seri özellikli bu lavların SiO2 içeriği %47.44-67.88, Mg# ise %11.33-53.04 arasında değişmektedir. Bu volkanik kayaçlar genel olarak yüksek alan elementlere (HFSE) kıyasla büyük iyon yarıçaplı elementler (LILE) ve hafif nadir toprak elementlerce (LREE) zenginleşme ile belirgin negatif Nb, Ta anomalisi göstermektedir. Bununla birlikte LILE’lerce tüketilmiş ve Nb ile Ta anomalisi vermeyen buna karşın çok belirgin Sr ve Ti anomalisi veren örnekler de bulunmaktadır. Bu örneklerin element davranış ve dağılımı bakımından daha farklı evrimleşmiş olduğu, dolayısıyla magmatik farklılaşmadan da değişik oranlarda etkilenmiş olduğu görülür. Petrolojik veriler, kıtasal asimilasyon etkisinin görüldüğü Palandöken volkanik kayaçlarının, granat ve spinel içeren ve yitim ile ilişkili metasomatize olmuş kıtasal litosferik ve astenosferik mantonun, farklı oranlarda fraksiyonlaşması ve magma karışımına sahip olduğunu işaret etmektedir.

Anahtar Kelimeler

Post-collision volcanism, geochemistry, magma mixture, Palandöken volcanics, petrogenesis

Destekleyen Kurum

Fırat Üniversitesi

Proje Numarası

FÜBAP-MF-16. 45

Teşekkür

Fırat Üniversitesine

Petrographic and Geochemical Characteristics of the Palandöken Volcanic Rocks in the Erzurum Region, Eastern Anatolia, Turkey

Öz

Palandöken volcanics are part of the Eastern Anatolia Volcanic Province system which is formed as a result of
the convergence-collision of the African, Arabian and Eurasian plates. These volcanics consist of lava flows and
intercalated pyroclastics forming a thick stack. These lavas are ranging from low silica basalts to high silica dacites
according to their silica content in compositions, in accordance with their geochemical and petrographical data.
These lavas with SiO2 content varying between 47.44-67.88% and Mg # between 11.33-53.04%, have calcalkaline
- tholeiitic and sodic series characteristics. In general, they show significant negative Nb, Ta anomaly with
enrichment in Large-Ion lithophile Elements (LILE) and Light Rare Earth Elements (LREE) compared to High-
Field Strength Elements (HFSE). On the other hand, there are also samples that have been consumed by LILEs, and
do not give Nb and Ta anomalies, but give very distinct Sr and Ti anomalies. It is seen that, these different examples
are the most evolved lavas in terms of elemental behavior and distribution because of the most affected by magmatic
differentiation. Petrological datas indicate that the Palandöken volcanic rocks, in which continental assimilation
effect is observed, have a metasomatized continental lithospheric and asthenospheric mantle associated with
subduction, containing garnet and spinel with partial melting at different rates, fractionation and magma mixture.

Anahtar Kelimeler

Post-collision volcanism,, geochemistry,, magma mixture,, Palandöken volcanics,, petrogenesis

Proje Numarası

FÜBAP-MF-16. 45

Kaynakça

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