北方干旱区表生介质中金存在形式的研究  

Modes of occurrence of gold in supergene medium in arid areas of northern China

作　　者：丁天才[1] 苏美霞[1] 冷福荣[2] 

机构地区：[1]内蒙古自治区地质调查院,内蒙古呼和浩特010020 [2]内蒙古国土资源勘查开发院,内蒙古呼和浩特010020

出　　处：《中国地质》2001年第10期35-40,共6页Geology in China

摘　　要：对北方干旱区表生介质(土壤或水系沉积物)中的金进行了7种存在形式的研究,结果表明:金主要以自然金相为主(50%以上),其次为水溶相、吸附相和有机相等。水溶相金在北方干旱气候带普遍存在,说明此自然景观区的金矿床,其表生介质中的金具有明显的溶解作用,呈水溶相金的形式进行迁移。当环境物化条件改变时,金沉淀形成局部富集。应用野外泡塑测金法,金异常衬度大、稳定性好,具有较好的找矿效果。The authors have studies seven modes of occurrence of gold in the supergene medium in arid areas of northern China.The results of study indicate that gold occurs main-ly as the native gold phase(over50%)and less commonly as the water-soluble phase,ad-sorbed phase and organic phase.The water-soluble phase gold is prevalent in the arid climat-ic zone of northern China,suggesting that gold in the supergene medium of gold deposits of this natural landscape region is markedly soluble and migrates in the water-soluble phase gold,and when the physical-chemical conditions of the environment change gold is precipi-tated and concentrated locally.When the field polyfoam gold-measuring method is applied,the gold anomaly shows a high contrast value and a good stability.So the method yields good ore-finding results.

关 键 词：表生介质 存在形式 水溶相金 泡塑测金波 华北地区 金矿床 干旱地区 

分 类 号：P618.51[天文地球—矿床学]