吉林椅山金矿床成矿物质来源及成矿模式

The matter source of metallogenic and mineralization model of Yishan gold deposit, Jilin

椅山金矿成矿主要与燕山晚期牛心屯花岗岩有关,成矿时代为燕山晚期,成矿物质具有双重来源———地层与岩浆源。牛心屯花岗岩体内石英爆裂法系统测温资料表明,该岩体在岩浆结晶期后曾有一次普遍的中—高温热液作用———成矿热液源和成矿热源。侵入石缝组接触带的牛心屯花岗岩体的岩石化学研究表明,从岩体进入围岩的元素有Si,K,Na,Fe3+等;围岩进入岩体的元素有Al,Mg,Ca,Fe2+等。矿石硫同位素研究表明,重硫少、富轻硫,轻硫可能来自围岩。矿体中δ18O研究证实矿体氧同位素大多数来自牛心屯花岗岩体,少量来自围岩。碳同位素组成特征反映金矿床内的碳来自围岩。

The mineralization of Yishan gold deposit is mainly related to Niuxintun granite of Latter Yanshanian and the metallogenic epoch of it was Latter Yanshanian. The metallogenic matter had double source that is stratum and magma. The quartz decrepitation method of the Niuxintun granite body show that the ore body had a prevalent middle-high temperature hydrothermal process (the source of the metallogenic hydrothermal and heat ) after the magma post-crystalline. The rock chemical study of the Niuxintun granite body that intrusive in the Shifeng Formation contact zone indicate that the elements from ore body enter into the host rock were Si, K, Na, Fe^(3+) et al, elements from host rock enter into ore body were Al, Mg, Ca, Fe^(2+) et al. The S isotope of ore show that the^(34)S is less than^(32)S, the^(32)S perhaps comes from host rock. The O isotope study indicates the O in the ore body almost from Niuxintun granite, partly from host rock. The C isotope feature shows that the C of the Yishan gold deposit is from host rock.