福建建阳高车金矿床黄铁矿标型特征研究

Study on Typomorphic Characteristics of Pyrite in the Gaoche Gold Deposit of Jianyang Districe,Fujian Province

从成因矿物学及找矿矿物学的观点出发,系统研究了建阳高车金矿床黄铁矿的形态、粒度、化学成分、硫同位素等方面的标型特征。通过对矿相学研究发现,黄铁矿普遍发育有环带结构,表明经历多期热液活动的特点。自然金贮存于粗晶自形黄铁矿中,且主要以他形包裹体形式存在黄铁矿晶体内部。主成矿期黄铁矿成分分析表现为Fe亏损,Co/Ni比值为1~104,且含有Mo;黄铁矿硫同位素δ34S值为-3.9‰^-7.8‰,以沉积硫为主,还有少量的海水硫与岩浆硫混入。结果均表明建阳高车金矿床成因属于中低温热液构造蚀变岩型金矿床。

Utilizing the theories of minerageny and prospecting mineralogy,a systematic study on the typomorphic characteristics in morphotype,grain size,chemical composition and sulphur isotope of pyrite has been made in the Gaoche gold deposit. The systematic mineralogical study shows that the zonal structure of pyrite is generally developed, which indicates the characteristics of multiple stages of hydrothermal activity. Gold occurs in pyrite and mainly as anhedral inclusions in pyrite crystals. During the main mineralization period, pyrite composition analysis showed Fe loss, Co/Ni=1-104, and contained some Mo. The sulfur isotope analysis of pyrite shows that δ34S =-3.9‰^-7.8‰, which indicates that the sedimentary sulfur is dominant, with a small amount of mixture between seawater sulfur and mantle sulfur. The above results indicate that Gaoche gold deposit may belong to the mesothermal-epithermal tectonic hydrothermal alteration type gold deposit.