茅排金矿床中自然金和黄铁矿的成因矿物学特征

作者通过对新发现的茅排金矿的研究,测试了自然金、黄铁矿的物理性质、化学成分等,并论述了成因矿物学特征。文中指出自然金、黄铁矿在矿体垂向上晶体形态的分布规律,利用形态系数计算公式可判断矿体、矿带的延伸方向和剥蚀程度。并指出,明金常见,自然金成色高,矿石中贫硫化物,黄铁矿中金品位高、Sb、Hg极低、无As,Co/Ni比较稳定、晶胞参数和红外吸收峰偏大等是“茅排式”金矿床的特点。

Minerageny of Native Gold and Pyrite in the Maopai Gold Deposit,Jiangxi Province

Based on the determination of physical properties and chemical composi-tion of native gold and pyrite from the newly--discovered Maopai gold depo-sit, the present paper deals with minerageny of native gold and pyrite. Vari-ous crystal forms of gold and pyrite could be observed along the vertical sec-tion of the orebody, and the formula for morphologic parameters might beused to judge the downward extension and the denudation degree of the ore-body and the ore belt. The "Maopai--type" gold deposit has some unique cha-racteristics: ores are rich in gold. and poor in sulfides; pyrite contains highgold (>200 g/t), very low Sb and Hg and no As, and has fairly stable Co/Niratios, somewhat large cell parameter a? and high infrared absorption peak.