次显微金在毒砂、黄铁矿等矿物中富集的成因研究  

STUDY ON ENRICHMENT FOR SUBMICRO-AU IN ARSENOPYRITE,PYRITE AND OTHER MINERALS

作　　者：王玉明[1] 陈克荣[1] 

机构地区：[1]山西大学师范学院地理系,南京大学地球科学系

出　　处：《矿物岩石》1996年第3期20-26,共7页Mineralogy and Petrology

摘　　要：本文详细探讨了次显微金在毒砂、黄铁矿等矿物中富集的成因机制，指出这些矿物生长时生长面附近出现的氧化还原电位局部降低和（或）（ＡｓＳ）３－，Ｓ２－等组分的局部负异常会导致金的络合物变得不稳定和易于分解，从而引起次显微金在这些矿物中富集。由此笔者解释了次显微金龙富集于小颗粒的毒砂、黄铁矿中及特别富集于这些矿物边缘的原因。同时笔者认为普遍呈小圆球形态出现于载金矿物中的金颗粒可能是金胶体沉聚下来形成的。It is discussed in detail that the enrichment mechanism for submicro-An in arsenopyrite, pyrite and other minerals. During these minerals growing up,the negative abnormal variation of the compositions of S2- and (AsS)3- and the reduction of Eh near the growing surface, it will be caused unstablity and decomposition of Au-complexes, and enrichment of submicro-Au in these minerals. Especially in the small grains and on the edges of them. At the same time, small ballshaped grain of An in the gold-bearing mineral were probably formed through sentimentution of colloid gold. Besides, the positive relationship betweer An-contents and As-contents in pyrite, and the reason for variatim of the An-content in pyrite and in chalcopyrite in different ore depositsare discussed also.

关 键 词：次显微金 毒砂 黄铁矿 富集机制 金矿物 

分 类 号：P578.11[天文地球—矿物学]