摘要
作为高新产业重要原材料的关键金属,在地壳内平均含量低和分布不均匀,使得其优势矿床类型尚不清晰,尤其是多类型多金属的共存储库—斑岩-矽卡岩-浅成低温热液成矿系统内共(伴)生的关键金属值得深入关注。北衙多金属矿是金沙江-哀牢山成矿带内与喜山期富碱斑岩有关的斑岩型铜金钼-矽卡岩型铁金铜-浅成低温热液型铅锌银金复合成矿系统。在系统梳理前人有关主体金属矿物原位微量元素研究的基础上,本次研究初步查明共伴生的关键金属包括四种:(1)Re:赋存于斑岩型和矽卡岩型矿化的辉钼矿中,含量为2.51×10^(-6)~62.64×10^(-6);(2)Co:以类质同象替代形式赋存于矽卡岩型矿化的磁铁矿中,含量为0.13×10^(-6)~41.1×10^(-6);(3)Bi:以铋化物形式赋存于斑岩型和矽卡岩型矿化中,包括铋铅矿、Bi-Cu硫盐、Bi-Pb硫盐、Bi-Ag硫盐、Bi-Cu-Pb硫盐、Bi-Pb-Ag硫盐和含Bi硫族化合物,其中辉铋矿是主要含铋矿物;(4)Te:赋存于斑岩型、矽卡岩型和浅成低温热液型矿化的硫化物(碲含量:80×10^(-6)~390×10^(-6))或碲化物中,后者包括三方碲铋矿、碲铋矿、碲铋银矿、辉碲铋矿等。结合已有地质和地球化学研究,推断关键金属(Re、Co、Bi和Te)的富集与新生代印亚大陆碰撞的动力学背景下,金沙江-哀牢山成矿带的深部强烈的壳幔相互作用有关。
Key metals are important raw materials to support the development of high-tech industries.Due to their low average and uneven distribution in the crust,their metallogenesis remains unclear.Porphyry-skarn-epithermal polymetallic mineralization systems,as the coexistence reservoir of multi-types of mineralization and metals,are worth paying more attention to the key metals.The Beiya gold polymetallic deposit is a significant metallogenic system,from porphyry Cu-Au-Mo mineralization through skarn Fe-Au-Cu mineralization to epithermal Pb-Zn-Ag(Au)mineralization,which was related to the Himalayan alkali-rich porphyry in the Jinshajiang-Ailaoshan metallogenic belt.Based on previous mineral insitu trace-element studies on the main metals,the associated key metals are divided into four types:(1)Re:occurs in the molybdenite of porphyry and skarn mineralization,with a content of 2.51×10^(-6)~62.64×10^(-6).(2)Co:occurs in the magnetite of skarn mineralization,with a content of 0.13×10^(-6)~41.1×10^(-6).(3)Bi:occurs in the bismuth minerals of the porphyry and skarn mineralization,including bismuth-lead mineral,Bi-Cu sulfosalt,Bi-Pb sulfosalt,Bi-Ag sulfosalt,Bi-Cu-Pb sulfosalt,Bi-Pb-Ag sulfosalt and Bi-bearing sulfides,of which the bismuthinite is the dominated Bi-bearing mineral.(4)Te:occurs in the sulfides(Te:80×10^(-6)~390×10^(-6))or telluride of porphyry,skarn and epithermal mineralization.The telluride minerals include tsumoite,joseite,volynskite,tetradymite and so on.Combined with previous geological and geochemical studies,it is inferred that the enrichment of key metals(Re,Co,Bi,and Te)in the Beiya polymetallic deposit was associated with the strong crust-mantle interaction in the deep part of the Jinshajiang-Ailaoshan metallogenic belt,which was under the post-collisional dynamic background of the Cenozoic India and Asian continental plates.
作者
王绍波
郭运康
张维权
林淞
马沁春
王永彬
WANG Shaobo;GUO Yunkang;ZHANG Weiquan;LIN Song;MA Qinchun;WANG Yongbin(Yunnan Gold Co.,Ltd.,Kunming,Yunnan 650224;Yunnan Key Laboratory of Earth System Science,Yunnan University,Kunming,Yunnan 650500;Key Laboratory of Critical Minerals Metallogeny in Universities of Yunnan Province,Yunnan University,Kunming,Yunnan 650500)
出处
《地质与勘探》
CAS
CSCD
北大核心
2023年第3期465-480,共16页
Geology and Exploration
基金
云南省基础研究专项-重点项目(编号:202201AS070004)资助。
