亚热带岩溶景观区金的表生地球化学异常特征——以云南东部富源胜境关金矿区为例

Characteristics of gold′s supergenic geochemical anomaly in the subtropical zone of Karst landscape area: A case of Shengjingguan gold deposit, Yunnan province

利用土壤地球化学和相态分析方法 ,对云南东部亚热带岩溶景观区内富源胜境关金矿区及其外围金的表生地球化学进行了研究。结果表明 :该区金的原生异常是经过表生带而被放大的 ,表现为在表生介质中形成强化的表生异常 ,是由于表生带中存在多种地球化学障而引起的 ;金的表生异常元素组合特征与原生异常基本一致 ;区内土壤中金的赋存主相态是铁锰氧化物相、吸附相和水溶相 ,且金趋于在土壤腐殖层 (A层 )富集 ;金的表生地球化学异常的发育主要受地理景观条件、土壤中的化学物理因素、土壤结构类型、区域构造及岩性和金的表生地球化学性质等因素制约。该景观区内金的表生地球化学异常特征及其制约因素的研究结果 ,为该区金的表生异常评价提供了理论依据。

After studying on the supergenic geochemistry of gold by means of soil geochemistry and phase forms analysis ,in Shengjingguan gold deposit,Fuyuan county,and surround region in the Karst landscape area of the subtropical zone in east Yunnan ,it indicated that the proto-anomaly of gold in this region was amplified through supergenic in the form of enhanced supergenic anomaly within supergenic media.It mainly results from many kinds of geochemical barrels in the supergenic zone, and the elements assembled feature of supergenic geochemical anomaly of gold is in consistent with that of the proto-anomaly.Main existing forms of gold in soil are iron-manganese′s oxides form,adsorbed form and dissolved form in the region, while the element of gold tends to enrich in the layer of soil.