Textural, mineralogical and paragenetic characteristics of Murgul deposit (Artvin-NE Turkey)-an example to the kuroko-type volcanogenic massive sulfide deposits
Küçük Resim Yok
Tarih
2001
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info:eu-repo/semantics/openAccess
Özet
Murgul maden yatağı, Doğu Pontid Tektonik Kuşağı'nın kuzeydoğu köşesinde bulunmakta ve tamamen Üst Kretase felsik volkanitleri tarafından içerilmektedir. Yatak, ana hatlarıyla, volkanik-eşlikli masif sülfitlerin hem Cu-pirit hemde Cu-Zn- tip' lerinin özelliklerini taşımaktadır. Birbirinden ayrı iki cevher kütlesi maden yatağını oluşturmaktadır ki birincisi yaygın olarak stokvörk ve saçınım ağırlıklı cevherleşmeden, diğeride egemen ince taneli masif cevherleşmeden oluşmaktadır. Maden yatağı, bir bütün olarak, geniş anlamda "sarı cevher" olarak kabul edilebilir. Stokvörk cevher, oldukça yüksek kuvars/ barit oranına ve pirit (I, II)-kalkopirit (I, II)-kuvars mineral parajenezine; masif cevher ise oldukça küçük kuvaslbarit oranına ve pirit (I, II)-kalkopirit (I)- sfalerit-galen-tetraedrit-kalkopirit (Il)-bornit cevher minerali parajenezine sahiptir. Saçınım, breşlenme, damar ve damarcık, ornatım ve atol cevher dokuları yatak içerisinde tesbit edilen en yaygın mikrodokulardır. Sfalerit bölgedeki diğer masif sülfitler de olduğu gibi, demir içeriğince çok fakirdir (< ağ.%1). Sıvı kapanımlar genelde iki-fazlı, sıvıca zengin, az doygun ve 160$\circ$ C ile 320$\circ$ C arasında yoğunlaşan formasyon ısıları vermektedirler. Sıvı kapanımlar ayrıca, %1 ile %5 eş değ. NaCl arasında değişen tuzluluk değerlerine sahiptirler.
The Murgul deposit is located in the northeasternmost corner of the Eastern Pontid tectonic belt and hosted mainly by the felsic volcanic rocks of Upper Cretaceous age. The deposit is essentially stratabound with characteristics of both Cu-pyrite and Cu-Zn-types of the volcanogenic massive sulfide deposits. Two spatially apart ore bodies, one being dominantly stockwork and disseminated ore, the other is predominantly fine-grained massive sulfide ore, constitute the deposit, and both can be considered as yellow ore in a broad sense. The deposit has a mineral paragenesis of pyrite(I,II)-chalcopyrite(I,II)-quartz with extremely high quartzlbarite ratio for the stockwork ore, and pyrite(I,II)-chalcopyrite(I)-sphalerite-galena-tetrahedrite /tennantite-chalcopyrite(II)-bornite with a very low quartz/ barite ratio for the massive ore body. Dissemination, brecciation, veins and veinlets, replacement, and atoll ore textures dominate throughout the deposit. Sphalerite, as in the other massive sulfide deposits of the region, is significantly Fe-poor (<1 wt.%). Fluid inclusions are mainly two-phased and typically liquid rich, under saturated and indicate formation temperatures between 160$\circ$ C and 320$\circ$ C. They typically have low salinities ranging from 1 to 5 wt.% eq. NaCl.
The Murgul deposit is located in the northeasternmost corner of the Eastern Pontid tectonic belt and hosted mainly by the felsic volcanic rocks of Upper Cretaceous age. The deposit is essentially stratabound with characteristics of both Cu-pyrite and Cu-Zn-types of the volcanogenic massive sulfide deposits. Two spatially apart ore bodies, one being dominantly stockwork and disseminated ore, the other is predominantly fine-grained massive sulfide ore, constitute the deposit, and both can be considered as yellow ore in a broad sense. The deposit has a mineral paragenesis of pyrite(I,II)-chalcopyrite(I,II)-quartz with extremely high quartzlbarite ratio for the stockwork ore, and pyrite(I,II)-chalcopyrite(I)-sphalerite-galena-tetrahedrite /tennantite-chalcopyrite(II)-bornite with a very low quartz/ barite ratio for the massive ore body. Dissemination, brecciation, veins and veinlets, replacement, and atoll ore textures dominate throughout the deposit. Sphalerite, as in the other massive sulfide deposits of the region, is significantly Fe-poor (<1 wt.%). Fluid inclusions are mainly two-phased and typically liquid rich, under saturated and indicate formation temperatures between 160$\circ$ C and 320$\circ$ C. They typically have low salinities ranging from 1 to 5 wt.% eq. NaCl.
Açıklama
Anahtar Kelimeler
Yerbilimleri, Ortak Disiplinler
Kaynak
Geosound
WoS Q Değeri
Scopus Q Değeri
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Sayı
38
