斑岩型铜钼矿床重要共(伴)生元素赋存状态与分布规律

Occurrence and distribution regularity of by-product elements in porphyry Cu-Mo deposits

斑岩型铜钼矿床除主要成矿元素Cu,Mo外,还往往共(伴)生Re,Co,Au,Ag等重要元素,综合回收利用共(伴)生金属具有重大资源及环境效益。通过研究斑岩型铜钼矿床中共(伴)生元素Re,Co,Au,Ag的品位、储量、赋存状态及分布规律,认为Co主要以类质同象形式赋存于黄铁矿中,其分布与黄铁矿密切相关,通常浓集于绢英岩化带外侧;Au,Ag主要以自然金、银与金银系列矿物的形式产出,Au,Ag在不同硫化物中的含量、颗粒粒度以及赋存形式差异很大,Au在各蚀变带均有可能富集,但主要浓集区域是钾化带与石英-绢云母化带;Ag在早期主要以Cu-Ag-Au的形式富集于绢英岩化带,晚期以Pb-Zn-Ag形式赋存于青磐岩化带;Re的分布与绢云母化带的辉钼矿密切相关。

In addition to Cu,Mo the by-product elements,such as Re,Co,Au,Ag etc.could be recovered from Cu-Mo porphyry deposits.Recovery of the by-product elements is significant to both mineral resources and environment.Study on their grade and reserves,occurrence and distribution regularity draws a conclusion as follows：Co occurs mainly as isomorphs in pyrite which is often enriched along the outside of phyllic zone;Au and Ag as native gold,native silver or electrum,and content,grain size and occurrence varied greatly in different sulfides,Au enriched in different alteration zones but mainly in the potassic zones and quartz-sericitization zones,Ag enriched mainly in phyllic zone in the form of Cu-Ag-Au in the early stage and in the propylitic zone in the form of Pb-Zn-Ag in the late stage;Re closely related to molybdenite of the phyllic zone.