紫木凼含砷微细浸染型金矿床金砷成矿过程初步研究  

A PRELIMINARY STUDY ON THE MECHANISMS OF PARAGENSIS AND SEPARATION FOR As AND Au IN THE ZIMUDANG As-BEARING FINE-DISSEMINATED GOLD DEPOSIT IN SOUTHWESTERN GUIZHOU PROVINCE

作　　者：朱赖民[1] 胡瑞忠[1] 

机构地区：[1]中国科学院地球化学研究所矿床地球化学开放实验室,贵阳550002

出　　处：《矿物学报》1999年第1期83-89,共7页Acta Mineralogica Sinica

基　　金：国家攀登计划预选项目!95-预 -2 5;中国科学院重大项目 B;贵州省科学技术基金

摘　　要：紫木凼含砷微细浸染型金矿床两个钻孔不同深度金、砷及伴生元素含量变化特征研究结果表明 ,在矿床深部金与砷密切共生 ,表现为正相关 ;而在矿床浅部金与砷关系并不密切 ,二者不相关或呈负相关。金矿床成矿热液中金可能主要以 Au(HS) -2 及 Au S-等形式迁移。砷则主要以 H3 As O03 形式迁移。随着成矿热液系统物理化学条件的改变 ,从成矿前阶段、热液主成矿阶段至晚成矿阶段 ,金、砷络合物在热液中的沉淀经历了共生、初始分离至分离的富集演化阶段。物理化学条件改变是导致金、砷共生分异的重要因素。Arsenic is a common element in fine disseminated gold deposits. In terms of the paragenic characteristics of gold and arsenic, great success has been achieved in the exploration of fine disseminated gold deposits in our country. It is of great significance in ascertaining the relation between gold and arsenic in the exploration of gold deposits. The gold and arsenic in ore solution were transported mainly in the form of chloride complexes such as Au(HS) - 2, AuS - and H 3AsO 0 3. With changing physical chemical conditions, the gold and arsenic in the ore forming process had experienced the stages of coexistence, separation, concentration and deposition.

关 键 词：金 砷 迁移形式 物理化学条件 共生分异 金矿床 

分 类 号：P618.510.4[天文地球—矿床学]