摘要
笔者根据泗顶—古丹铅锌矿田矿石铅同位素组成特征,并结合矿田成矿地质背景,探讨其地质意义。研究结果表明:方铅矿的铅同位素组成特征随硫同位素组成特征和矿化场所的变化而变化,铅同位素组成模式年龄依矿田出现的地质事件可分两组(410—600Ma,180—260Ma),并可建立起二源线性混合方程,因此,成矿物质来源具两源性。故认为泗顶——古丹铝锌矿田的硫化物矿床,成矿物质来源于加里东运动褶皱基底轻微变质的寒武系和盖层泥盆系,含矿溶液是赋存于该两个地层中的地下水混合产物,即二源地下水混合成矿作用结果。
Based on the characteristics of lead isotope composition of galena and the metallogenesis of the Sidin-Gudan Pb-Zn orefield, the author has a discussion on the geological significance of the lead isotope composition. The results of this study show that the isotope composition of lead in galena varies with that of sulfur as well as mineralized site; that the model ages of lead isotope composition cab be divided into two groups (ie., 410-600 Ma and 180-260 Ma) according to the geological events occuring in this orefield; and that a linear equation can be established to indicate a dual source for the lead isotope Composition. The author believes that the ore-forming materials of this orefield may have been derived from the slighty metamorphosed Cambrian basement and the Devonian cover and that the ore-bearing solutions may have been the product of the mixing of the underground water from these two parts.
关键词
铅锌矿
铅同位素组成特征
二源地下水混合成矿
Pb-Zn ore, lead isotope composition, ore-forming process by the mixing of underground water of two sources, Sidin, Gudan
