Au的表生地球化学特征及其在异常评价中的意义  

Supergene geochemical feature of gold and its implications for anomaly evaluation

作　　者：王瑞廷 韩俊民 王涛 代军治 欧阳建平[2] 白山稳 

机构地区：[1]西北有色地质勘查局,陕西西安710054 [2]中国地质大学地球科学学院,湖北武汉430074 [3]陕西省行政干部管理学院,陕西西安710068

出　　处：《地质通报》2010年第9期1329-1337,共9页Geological Bulletin of China

基　　金："十一五"规划国家科技支撑计划课题(编号:2006BAB01A11)资助

摘　　要：地下水、地表水、土壤、水系沉积物等表生介质中,Au主要以6种相态存在,即水溶相、表面吸附相、有机相、自然金相、铁锰氧化物相和硫化物相。表生环境下Au更多地表现出亲铁性,但也具有一定的亲硫性。研究表明,不同景观区Au表生异常的形成机制和赋存层位不同。在表生异常实际评价过程中,分析工作区的地质地理景观环境,从研究异常地段表生环境参数(pH、Eh、Ec、温度、降雨量等)入手,明确异常元素的表生地球化学特征,分析成晕机制,在综合地质因素的基础上对异常进行系统精细的评价。通过对黄家湾地区Au表生异常的研究评价,认为在评价Au的表生异常时,结合Au的表生迁移富集规律,采用异常确证→相态分析→判断评序→检查评价→工作验证的方法程序,能够取得较好的异常评价找矿效果。The gold exists mostly in supergenic media including underground water,surface water,and stream sediments by six facies,such as soluble facies,surface adsorbing facies,organic facies,natural gold facies,iron and manganese oxides facies,and sulfide facies.The gold displays more siderophility,but has sulphophility under supergenic environment.In the process of practically evaluating supergenic anomaly,it should deeply analyze geological and geophysical landscape environment,and determine supergenic geochemical feature of anomalous elements by studying supergenic environment indexes（pH,Eh,Ec,temperature,rainfall,and so on） in anomaly location,and research anomaly-forming mechanism in order to systematically particularly evaluate anomaly on the basis of compositing geological factors.In fact,on the basis of understanding the law of gold supergenic transportation and enrichment,it can reach good anomaly evaluating exploration effect by using anomaly proving →elements facies analyzing →anomaly judgement and ordering → checking and estimating→validating work procedure during concretely evaluating gold supergenic anomaly,and illustrate by case in Huangjiawan region.

关 键 词：金 表生地球化学 表生异常 异常评价 金矿床 

分 类 号：P578.11[天文地球—矿物学] P595[天文地球—地质学]