金矿床中环带状黄铁矿及其生长演化过程的研究

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

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

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.