Geology, Geochemistry, and Isotope Ratio (𝛿65Cu - 𝛿34S ‰) of Manto-Type Gölcük (Koyulhisar-Sivas) Cu (±Ag) Mineralisation

Öz

Gölcük (Koyulhisar-Sivas) Cu (Ag) mineralisation is hosted by Eocene basalt and andesite and pyroclastics with volcanic-volcano-sedimentary rocks. Ore minerals are bornite, chalcopyrite, covellite, chalcocite, malachite, magnetite and hematite. Alteration in the host rocks includes sericitization, argillisation, carbonation, iddingsitization and epidotization. Gangue minerals are limited to quartz and calcite. According to the analysis results for the drill core samples, 2.97% Cu and 37 g/t Ag grade was determined at an average depth of 9.7 m from the surface. Sulphur isotope values (δ34S ‰) range from -20.0 to +2.8 in surface samples and from -6.3 to +0.6 in core samples. Copper isotope values (δ65Cu ‰) range from -0.86 to +1.38 in surface samples and -1.41 to +2.69 in core samples. For Gölcük Cu (Ag) mineralization, ore mineral paragenesis, alteration mineralogy, deposit type, and isotope geochemistry values suggest that it may be a Manto-type deposit.

Anahtar Kelimeler

• Gölcük Cu (±Ag)
• Manto-type Mineralization
• S-Cu Isotopes

Gölcük (Koyulhisar-Sivas) Manto-Tipi Cu (±Ag) Cevherleşmesinin Jeolojisi, Jeokimyası ve İzotop (𝛿65Cu - 𝛿34S ‰) Oranları / Geology, Geochemistry, and Isotope Ratio (𝛿65Cu - 𝛿34S ‰) of Manto-Type Gölcük (Koyulhisar-Sivas) Cu (±Ag) Mineralisation

Öz

Gölcük (Koyulhisar-Sivas) Cu (Ag) cevherleşmesi, Eosen yaşlı bazalt ve andezit ile bunların piroklastiklerini içeren volkanik-volkanosedimanter yan kayaçlıdır. Cevher mineralleri bornit, kalkopirit, kovellit, kalkosit, malakit, manyetit ve hematittir. Yan kayaçlarda alterasyonlar serizitleşme, killeşme, karbonatlaşma, iddingsitleşme ve epidotlaşmadır. Gang mineraller kuvars ve kalsit ile sınırlıdır. Sondaj karot örneklerinin analiz sonuçlarına göre, yüzeyden ortalama 9,7 m derinlikte %2,97 Cu ve 37 g/t Ag tenör olarak belirlenmiştir. Kükürt izotop değerleri (δ34S ‰) yüzey örneklerinde -20,0’dan +2,8’e, karot örneklerinde -6,3’den +0,6’ya değişim aralığındadır. Bakır izotop değerleri (δ65Cu ‰) yüzey örneklerinde -0,86’dan +1,38’e, karot örneklerinde -1,41’den +2,69’a değişim göstermektedir. Gölcük Cu (Ag) cevherleşmesi; cevher mineral parajenezi, alterasyon mineralojisi, yataklanma tipi ve izotop jeokimya değerlerine göre Manto-tipi olabileceği öngörülmektedir.

Anahtar Kelimeler

• Gölcük Cu (±Ag)
• Manto-tipi Cevherleşme
• S-Cu İzotopu

Kaynakça

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