硫化物中不可见金的研究现状

近年来，不可见金的研究，运用高分辩透射镜和离子探针等综合测试方法取得了很大突破。不可见金，指的是硫化物中以超显微包裹体或固熔体形式存在的超显微金、次显微金。金质点上限近来Cook等定为0.1μm。由加拿大、希腊、美国等一些金矿床研究表明，硫化物中不可见金主要见于卡林金矿床以及热液、块状硫化物及矽卡岩型矿床中，其形成多与载体矿物黄铁矿、毒砂相关，并往往优先富集于毒砂中，如卡林金矿床黄铁矿金含金量为数十至数n×10-n×100×10^-6，而毒砂中则高达近一倍。不可见金的研究，在当前无论对其矿石加工工艺研究，还是对找矿工作，都具有重要意义。

PRESENT SITUATION OF STUDY ON INVISIBLE GOLD IN SULFIDES

Recently,a great breakthrough has occurred in study on invisible gold with comprehen-sive test methods using high -reso resolution transmission electron microscope and electron probe etc. Invisible gold means ultramicro and submicro gold present in sulfide in the form of ultramicroinclusion of solid solution. The gold particle is less than lμm in size following Cook et al. Studies on the gold deposits of Canada,Greece and United States show that the sulfide yielding invisible gold is mainly in the gold deposits of Carlin type,hydrothermal type,mas-sive sulfide type and skarn type. The formation of the invisible gold is mostly related with carrier minerals(pyrite and arsenopyrite)and mainly in arsenopyrite. For example,in Carlin gold deposit,gold content is tens to hundreds 10-6in pyrite and twice as high in arsenopyrite. The study of invisible gold is significant to both studying ores prolessing te chnology and ore - searching.