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ILICA TİPİ EPÎTERMAL ALTIN YATAKLARI

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Abstract (Original Language): 
Ilıca tipi altın yatakları, yeryüzeyinin birkaç yüz metre derinliğinde oluşmuş ve halen oluşmakta olan volkanik tip epitermal yatakların ayrı.bir grubu olarak ele alınmaktadır... Silika sinter1 ve yaygın silisleşme ile hidrotermal patlama breşleri bu tipin belirgin özellikleridir.. Yatak tipi için en uygun, bölgesel tektonik konum kaktera kenarları boyunca veya çaprazmadır. Bununla birlikle,, cevherleşme genelde ana fay zonu içerisindeki tali kırıklarda yerleşmektedir. Cevher yataklarının,, volkanik kayalarla doğrudan bir ilişkisi yoktur.. Mağmatik etkinlik sadece, hidrotermal. dolaşımı yürütmek üzere gerekli ısıyı 'sağlamaktadır. Cevherin değişik litolojilerde bulunması, ana kaya bileşiminin kontrol edici bir etken olmadığını gösterir. Altın, elektrom, stibnit, realgar» gömüş sülfotuzları ve pirit başlıca cevher mineralleridir.. Baz metal içeriği tipik olarak, düşüktür... Adülarya, serisit ve kuvars ana gang mineralleridir, ve manganez cevherleşmenin çevresinde bir hale oluşturur. Cevherleşme saçılmıştır, fakat bantlı damar dolguları da görülür... Au-As-Sb-Hg-Tİ derinlikle azalırken, Ag ve baz metaller düşey jeokimyasal zonlanmada artarlar.. Serisitik ve arjilik yan kaya alterasyonu geneldir... Duraylı izotop incelemeleri, hidrotermal akışkanların başlıca meteorik su kökenli olduklarını gösterir. Cevherli sıvıların tuzluluğu 0 ile 13 ağırlık % NaCl eşdeğeri arasındadır. Ortalama klorid iyon konsantrasyonu 1200 ppm, ve toplam, indirgenmiş kükürt 100 ppm dir. Akışkanların pH sı nötre yakındır. Au, hatta As vt Sb tiyo-kanflaşıklar (Au (HS>2) olarak taşınmıştır. Hidrostatik ve litostatik basınç düzeyleri arasında akışkanların kaynaması üyo-karmaşddann bozulmasına ve nabit altının çökelmesine yol .açmıştır.
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