黑钨矿的次生富集及找矿意义

Secondary Enrichment of Tungsten and Its Significance in Ore Exploration

黑钨矿在风化作用下,矿物中的Fe^(2+)、Mn^(2+)易氧化变价,Ca^(2+)溶解,钨的络阴离子被铁锰氧化物和氢氧化物吸附,形成次生钨矿物,在矿床氧化带富集形成“钨帽”,是找原生钨矿床的重要找矿标志.

Under weathering, in the primary tungsten minerals of wolframite, Fe^(2+) and Mn^(2+) are easy to beoxidized and change their valences, Ca^(2+) is dissolved, and the negative complex ions of tungsten areadsorbed by oxides and hydroxides of iron and manganese to form into secondary tungsten minerals,which are enriched in the oxidation zone of a tungsten deposit and appeared as a'tungsten cap'. This'cap' is an ore important guide for finding primary W-deposits.