云南省伴(共)生金矿地质特征研究

GEOLOGICAL FEATURES OF ASSOCIATED(PARAGENIC) GOLD ORE DEPOSITS IN YUNNAN

云南省金及伴(共)生金矿,可划分10个成矿带(区),含7个成矿亚带(区),主要分布在大地构造单元的活动区及稳定区的边缘,多沿深大断裂两侧分布。伴(共)生金矿划分8大成因—工业类型,占储量比例大的为火山岩型、沉积变质型、沉积改造型,其中火山岩型、热液型、斑岩型、岩浆型,通过深入工作,往往有发展为独立金矿的可能、而沉积改造型一般只能综合回收利用。

With regard to gold and associated (paragenic) gold ore deposits, ten met-allogenic belts (regions) (containing seven metallogenic subbelts(subregions)) maybe distinguished. They are mainly distributed on the margins of mobileregions and stable regions of tectonic units, mostly along both sides of great deepfractures. Associated (paragenic) gold ore deposits may fall into eight genetic-industrial types, of which those accounting for a large proportion of the reservesare the volcanics type, metemorphosed sedimentery type and sedimentery-remould-ed type. Through intensive work, independent volcanics, hydrothermal, porphyryand magmatic gold deposits may probably be found, while gold in sedimentary-remoulded type generally can only be recovered as a by-product for comprehensiveutilization. The practical method in the future gold prospecting is to re-evaluatethe gold in those mineral deposits (or occurrences) that were associated with goldbut were rejected because the principal metal(copper, lead, zinc)that were the maintargets of prospecting in those deposits were low-grade or those deposits weresmall in osize. Attention should be paid to the study of the hanging wall and foot-wall of the host rocks of the principal metals and to the study of the gold carrierminerals of different generations in order to find gold concentration sectors as fastas possible.