非洲热带草原景观区金的次生晕特征及分散模式  

CHARACTERISTICS OF SECONDARY HALOS AND DISPERSION PATTERNS OF AU IN AFRICAN TROPICAL GRASSLAND LANDSCAPE

作　　者：左立波[1,2] 汪明启[2] 王杰[1] 徐洋[2] 俞礽安 黎湘 

机构地区：[1]中国地质调查局天津地质调查中心,天津300170 [2]中国地质大学地球科学与资源学院,北京100083 [3]湖北省地质调查院,湖北武汉430034

出　　处：《物探与化探》2013年第4期573-579,共7页Geophysical and Geochemical Exploration

摘　　要：乍得共和国Mayo kebbi省Pala地区是该国最重要的砂金矿区,多家公司先后致力于在该区域寻找岩金,然而经过大量的槽探工程施工与钻孔验证,均未发现好的矿体。为了解释地表Au异常的形成过程及原因,笔者在Pala地区针对金矿开展了地球化学勘查,对热带草原景观区Au的次生晕特征进行了讨论与总结,通过土壤垂直剖面测量分析了Au在准平原化过程中的地球化学行为,并最终解释了该区域金异常的成因。本次研究对国内企业赴非洲相同景观条件下进行金矿勘查具有指导意义。The Pala area is the most important mining area for alluvial gold in Mayo Kebbi Region, Chad. Many companies tried to find rock gold in this area; nevertheless, they all failed to find any good ore bodies in spite of lots of trenching and drilling work. To illus- trate the formation process and origin of gold anomalies, the authors conducted geochemical exploration of gold mines in Pala with the purpose of summing up the characteristics of secondary halos of Au in African tropical grassland landscape. Vertical soil profile meas- urement was also made to analyze the geochemical behavior of Au during pediplanation so as to explain the origin of gold anomalies. The results obtained by the authors are of directive significance for gold exploration work of China~ companies in Mrica under the same landscape condition.

关 键 词：砂金 土壤地球化学测量 异常查证 准平原化 乍得 

分 类 号：P632[天文地球—地质矿产勘探]