江西金山金矿床黄铁矿与金成矿关系的模拟实验研究

金山金矿床明显受金山—西蒋剪切带控制,金矿体产于剪切糜棱岩带中。金矿石的物质成分比较简单,黄铁矿是主要金属矿物,也是矿石中自然金的主要载金矿物,统计及分析结果表明,矿物中仅占2.51％的黄铁矿中所含的金却占矿石金总量的80.80％,可见分散浸染黄铁矿与金矿化关系密切。为了深入研究黄铁矿与金成矿的关系,作者进行了载金矿物黄铁矿活化、迁移及成分变化的模拟实验。实验结果表明,在构造作用的高温高压条件下,黄铁矿可以产生活化、迁移,其中的成矿元素含量有所升高,而且在多期构造应力作用下,可使成矿元素Cu、Au叠加富集。

RELATIONSHIP BETWEEN PYRITE AND GOLD MINERALIZATION IN THE JINSHAN DEPOSIT AND ITS SIMULATING EXPERIMENT

The Jinshan gold deposit is obviously controlled by the Jinshan－ Xijiang shear zone,and the ore bodies are occurred in the shear mylonite zone.The composition of ores is simple;the metallic mineral is dominated by pyrite,which is the main auriferous mineral.It is shown that,pyrite,about 2.51 percent of the amount of minerals,possesses about 80.80 percent of the total gold content in the deposit.Thus,pyrite,especially the disperse disseminated pyrite,is closely connected with gold mineralization,the remobilization,transport and change of composition of auriferous pyrite is simulated.The experiment reveals that,pyrite can be mobilized and transported under the high temperature and high pressure condition,the concentrations of ore－ forming elements in pyrite obviously increased,and the superposition and enrichment of Cu,Au can take place after the multiple actions of tectonic stress.