山东自然金、银金矿矿物特征

MINERALOGICAL CHARACTERISTICS OF NATIVE GOLD AND ELECTRUM FOUND IN SHANDONG

摘要:

山东的各类金矿床中的金,绝大多数是以金银固溶体系列矿物出现。在相同矿床中不同金的颗粒金银的比例变化很大,且呈连续变化,即含金量由96.99％到26.44％。这种变化与成矿条件,特别是与温度关系密切。胶东地区银金矿、自然金中普遍含有Sb、Se、Hg,而鲁西地区则含Bi、Hg等微量元素。银金矿、自然金与硫化物关系密切,且都呈包体状态或晶隙,裂隙状态分布于矿石中。银金矿,自然金多呈不规则的粒状、片状、树枝状、园粒状、丝状等,但在不同矿区,特别是矽卡岩型矿区中见到了完好的八面体、四面体、立方体和菱形十二面体以及它们的不同形态的聚晶与歪晶。这些矿物的颜色、比重、硬度、反射率以及晶胞参数等物理特征与金银含量比变化有明显关系。

Abstract:

Most gold in the various gold ore deposits in Shandong occurs as mineral serials of gold-silver solid solution. The percentages of gold in differnt goldsilver grains from the same deposit can vary n oticably and continuously,nomely,from 96.99%,to 26.44% whieh is closely related to the meneogenetic conditions, especially to the temperature. It is common that minerals of electrum and native gold present in the gold deposits in Eastern Shandong contain Sb, Se and Hg; while those in Western Shandong contain Bi,...