安徽铜陵姚家岭大型锌金矿床中新发现白钨矿  

Discovery of Scheelite in Yaojialing Large Zinc-Gold Deposit in Tongling Ore District,Anhui Province,China

作　　者：钟国雄[1] 周涛发[1] 袁峰[1] 蒋其胜 范裕[1] 张达玉[1] 黄建满 

机构地区：[1]合肥工业大学资源与环境工程学院,合肥230009 [2]华东冶金地质勘查局812地质队,安徽铜陵244008

出　　处：《地质学报》2014年第4期620-629,共10页Acta Geologica Sinica

基　　金：国家"深部探测技术与实验研究专项(SinoProbe)"第三项目"深部矿产资源立体探测技术及实验研究"第五课题(编号SinoProbe-03-05);国家自然科学基金项目(编号41320104003和40830426);中国地质调查局地质调查工作项目(编号1212011121115和1212011220243);安徽省公益性地质工作项目(编号2011-20);新世纪优秀人才支持计划项目(编号NCET-10-0324)联合资助的成果

摘　　要：姚家岭大型锌金多金属矿床位于长江中下游成矿带铜陵断隆区的东部。本次研究中,在姚家岭矿床蚀变花岗闪长斑岩与大理岩化灰岩捕掳体的接触带的矽卡岩等位置发现了白钨矿。白钨矿电子探针定量分析表明,与理论值相比,WO3值总体偏低,CaO值总体略高于理论值,白钨矿的杂质组分主要为SrO、MoO3、CuO、FeO、MnO、MgO、V2O5和PbO2,计算显示白钨矿的化学式为Ca1.00W0.99O4。铜陵矿集区Zn-Au-Cu-Pb为主的矿床中白钨矿的发现表明,该区成矿系统的演化及热液成矿作用过程中可能发生了轻微的壳幔相互作用,在铜陵矿集区及长江中下游成矿带的其他矿集区要重视和加强钨矿化的研究。The Yaojialing large zinc-gold polymetallic deposit is located in the eastern part of the Tongling uplift district.It is a recently-discovered large zinc-gold deposit in the Middle-Lower Yangtze River Valley metallogenic belt and it is also the first large zinc-gold deposit in the Tongling district with drilling indicated reserves of 1.2 Mt of Zn with an average ore grade of 3.64%,50 t of Au,and Pb,Cu and Ag as by-products.The dominant orebodies,whose shapes commonly consist of vein or lenticular,occur along the contact zone between early Cretaceous granodiorite porphyry intrusion and Carboniferous-Triassic limestone or situate inside limestone xenoliths entrapped within the porphyry intrusion.The common ore minerals comprise sphalerite,galena,chalcopyrite,gold,pyrite,minor scheelite,molybdenite,bornite, hematite and magnetite,etc.Gangue minerals include calcite,garnet,K-feldspar,quartz,fluorite, epidote and so forth.Metasomatic texture,subhedral to anhedral granular texture and disseminated-massive structure are regarded as the staple ore texture and structure.Wall-rock alterations existed in the deposit are well developed and mainly present as K-feldspar alteration, skarnization, silicification, sericitization, carbonatization, clayzation. Needs to be stressed that skarnization, silicification and carbonatization are closely associated with mineralization.Scheelite has been discovered in some locations especially in the skarn on the contact between limestone and granodiorite porphyry intrusion.Compared with the theoretical values for scheelite composition,the value of WO3 in the deposit is generally a little lower than the theoretical value whereas the value of CaO is slightly higher.There are some other impurities including SrO,MoO3 ,CuO,FeO,MnO,MgO,V2 O5 and PbO2 .The chemical formula for scheelite is Ca1.00 W0.99 O4 .The discovery of scheelite in the Zn-Au-Cu-Pb deposit in Tongling area indicates that metallogenic system evolution and hydrothermal mineralization probably witnessed the slight crust-mantle int

关 键 词：白钨矿 姚家岭 铜陵 长江中下游成矿带 

分 类 号：P618.2[天文地球—矿床学]