金矿床中环带状黄铁矿及其生长演化过程的研究  

A STUDY ON ZONAL PYRITE AND ITS GROWTH AND EVOLOTION IN GOLD DEPOSITS, SOUTHERN GUIZHOU

作　　者：李德忍[1] 

机构地区：[1]中国科学院地球化学研究所,贵阳550002

出　　处：《矿物学报》1995年第4期428-432,共5页Acta Mineralogica Sinica

摘　　要：利用电子探针对黔南卡林型金矿床中环带状黄铁矿进行研究，把它划分成三种类型，并分别测定内外带中As、Sb、Au、Hg和Tl等微量元素的含量，绘制了以步间距1μm，横穿环带的这五种元素的X射线强度变化曲线图，图中清楚显示出环带起因于微量元素含量的变化，这五种元素在微观尺度上呈正相关的振荡式变化，具有同源性。讨论黄铁矿经由胶体粒子的聚集、固结与结晶的生长演化过程，提供了低温热液可能是一种富含成矿质的多相胶体溶液，黄铁矿在结晶与重结晶过程中要产生净化作用的大量证据，还提出该金矿床的金可能是胶体吸附的产物，并在以后更富含成矿物质的低温热液作用下进一步富集，推测有可能根据黄铁矿的结晶形态、环带形状与分布以及分凝析出情况，对卡林型金矿床进行分带与寻找。Samples of zonal pyrite collected from the Carlin-type gold deposits in southern Guizhou Province were examined by using electron microprobe and three kinds of pyrite have been classi-fied. In addition the contents of trace elements such as As, Sb, Au, Hg and Ti in the inner and outer zones of pyrite were also determined. It is evidenced that zoning in pyrite is caused by the content variation of those trace elements. The growth and evolution of pyrite are also discussed,providing strong evidence suggesting that low-temperature hydrothermal solution may be a multi-phase colloidal solution rich in ore-forming materials and that purification may take place in the process of crystallization and recrystallization of pyrite. It is also evidenced that gold in the gold de-posits may be the product of colloidal adsorption. It is deduced that the crystal form, zonation and distribution of pyrite may be helpful to the zonation of the Carlin-type gold deposits and their prospecting.

关 键 词：金矿床 卡林型 黄铁矿 环带构造 电子探针 演化 

分 类 号：P618.510.4[天文地球—矿床学]