风化作用元素迁移与金富集机制研究--以国内外典型红土型金矿床为例

以国内外典型红土型金矿床为例，采用质量平衡和地质统计分析方法，探讨了风化作用元素迁移与金富集机制。研究表明，元素迁移与风化强度有关。风化作用较弱时．以淋滤FeO、MgO、CaO、Na2O、K2O等组分为主；风化作用较强时，Al2O3、Fe2O3、SiO2亦发生大量迁移。Au富集主要有两种方式：其一，Au从载金矿物中活化后被表生矿物吸附，随着其它组分的淋失而逐步残余富集；其二，Au随FeO、MgO、CaO、Na2O、K2O等组分一起淋滤，而在风化壳下部被低价铁锰离子还原富集。

Study on mechanism of elements migration and gold enrichment during weathering process: an example from critical lateritic gold deposits international

To reveal the elements migration and gold enrichment mechanism during weathering process,this paper,taking the critical lateritic gold deposits international for example,carried out the mass balance calculation and geostatistical analysis.It shows that elements migration has a close relation with weathering strength.Under weak weathering condition,FeO,MgO,CaO,Na_2O,K_2O are leached.Whereas,Under strong weathering condition,Al_2O_3,Fe_2O_3,SiO_2 also much migrated.Au enrichment can be concluded as two aspects.One is,Au was released from gold-bearing minerals and adsorbed by supergene minerals,and enriched relatively with the loss of other components.The other is,Au was leached with FeO,MgO,CaO,Na_2O,K_2O,and precipitated by Fe~(2+) and Mn~(2+) at the lower part of the lateritic profile.