Arıklı (Çanakkale-Türkiye) kuzeybatısında fay zonlarında gözlenen damar tipi U-Th zenginleşmesinin mikrotermometrik özellikleri

Yıl 2021, Cilt: 11 Sayı: 3, 729 - 743, 15.07.2021

Sercan Öztürk Cihan Yalçın Mustafa Kumral

https://doi.org/10.17714/gumusfenbil.866085

Öz

Batı Anadolu’da birçok bölgede U-Th zenginleşmeleri gözlenir. Biga Yarımadası sınırları içindeki Arıklı ve civarındaki tüflerde gelişen fay zonlarında da U ve Th zenginleşmeleri bulunur. Cevherleşme damar tipi şeklinde ve epijenetik oluşumludur. Bölgenin temelini Çetmi Ofiyolitik Melanjı oluşturur. Bu birim üzerinde Arıklı tüf üyesi ve şeyl-kumtaşı üyesinden oluşan Küçükkuyu formasyonu yer alır. Bölgedeki en genç birim ise diyabaz dayklarıdır. İnceleme alanı Paleojen dönemindeki deformasyonlardan etkilenmiş ve E-W ve NE-SW uzanımlı eğim atımlı fay sistemleri gelişmiştir. Örencik tepesi civarındaki fay zonunda U için 64-1640 ppm ve Th için ise 302-11813 ppm değerleri elde edilmiştir. Aynı zamanda bu fay zonunda hidrotermal magnezit breşleri gelişmiştir. Cevherleşme ile ilişkili olan bu breşlerde mikrotermometrik ölçümler sonucunda homojenleşme sıcaklıklarının (Th, oC) 282-348 oC arasında olduğu ve % NaCl tuzluluk eşdeğerlerinin de 4.2-8.0 arasında olduğu belirlenmiştir. Sıvı kapanımların çözelti sisteminin H2O- MgCl2-CaCl2 şeklinde olduğu ve sıvıların yoğnuluğunun da 0.58-0.74 g/cm3arasında olduğu ortaya çıkarılmıştır.

Anahtar Kelimeler

Arıklı tüf üyesi, Hidrotermal manyezit, Mikrotermometrik ölçümler, Damar tipi U-Th cevherleşmesi

Microthermometric characteristics of vein type U-Th enrichment observed in the Fault Zones in Northwest of Arıklı (Çanakkale-Turkey)

Öz

U-Th enrichments are observed in many regions in Western Anatolia. There are also U and Th enrichments in the fault zones developed in the tuffs in Arıklı in Biga Peninsula. The characterization of the mineralization is vein type and epigenetic formation. Çetmi Ophiolitic Melange forms the basis of the region. Küçükkuyu formation, which consists of Arıklı tuff member and shale-sandstone member, is located on this unit. The youngest unit in the region is diabase dykes. The study area was affected by deformations during the Paleogene period and E-W and NE-SW extended dip slip fault systems were developed. In the fault zone around Örencik Tepe, 64-1640 ppm values for U and 302-11813 ppm values for Th were obtained respectively. At the same time, hydrothermal magnesite breccias developed in this fault zone. Because of microthermometric assessments in these breccias associated with mineralization, it was determined that the homogenization temperatures (Th, oC) were between 282-348 oC and the % NaCl salinity equivalents were between 4.2-8.0 respectively. It was identified that the solution system of the liquid inclusions is as H2O-MgCl2-CaCl2 and the density of the liquids is between 0.58-0.74 g/cm3.

Anahtar Kelimeler

Arıklı tuff member, Hydrothermal magnesite, Microthermometric measurements, Vein type U-Th mineralization

Kaynakça

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