祁雨沟金矿自然金晶体形态和微形貌的生长动力学研究

A STUDY ON KINETICS OF CRYSTAL FORM AND MICROMORPHOLOGY OF NATIVE GOLD IN QIYUGOU GOLD DEPOSIT

根据自然金晶体生长和台阶运动的动力学以及台阶聚并规律 ,自然金的晶体形态和晶面微形貌具有较强规律性。晶体形态随温度和金的过饱和度增高 ,由 { 110 }习性晶经 { 10 0 }习性晶演变为 { 111}习性晶 ;晶面上阶梯状生长纹的高度随金的过饱和度的增大而增高 ,阶梯的密度随热液碱性程度的升高而增大。这一结论得到河南祁雨沟金矿 、 阶段自然金晶体形态的证实 ,并与其它金矿的地质事实和人工合成实验结果相符 ,其对金矿成矿和找矿研究具一定的指导意义。

Based on the laws of kinetics of crystal growth, step motion and step accumulation, we studied the crystal form and micromorphology of native gold. It is shown that the crystal form varies from ｛110｝ by ｛100｝ into ｛111｝ as the temperature and oversaturation degree of gold increase. The height of the steps on crystal faces increases with the increment of oversaturation degree of gold. The density of the steps adds with the rise of alkalinity. These conclusions are affirmed by the crystal form and micromorphology of native gold of the fifth and seventh mineralization stages in the Qiyugou gold deposit, Henan, and by the data from other gold deposits, as well as by the results of synthetic experiment.