云南北衙地区钨矿化特征与找矿方向  

Tungsten mineralization characteristics and prospecting of Beiya area,Yunnan Province

作　　者：朱乔乔[1] 张长青[1] 娄德波[1] 张云生 李永生 刘成飞 孙嘉[1] 贾福东[1] 吉晓佳 LIN Bin;TANG JuXing;TANG Pan;ZHENG WenBao;GREG Hall;CHEN GuoLiang;ZHANG ZhongKun(MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,CAGS,Beijing 100037,China;Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,Sichuan China;China Gold International Resources Co.,Ltd.,Beijing 100011,China;Tibet Huatailong Ming Co.,Ltd.,Lhasa,850212,Tibet,China)

机构地区：[1]中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室,北京100037 [2]云南黄金矿业集团股份有限公司,云南昆明650224 [3]中国地质大学地球科学与资源学院,北京100083

出　　处：《矿床地质》2019年第6期1245-1262,共18页Mineral Deposits

基　　金：中国地质调查局地质调查项目（编号：DD20160124）;中央级公益性科研院所基本科研业务费专项资金（编号：KK1702）;国家自然科学基金项目（编号：41702093,41573042,41925011）共同资助

摘　　要：云南北衙矿床是中国21世纪初新发现的超大型矽卡岩-斑岩型金多金属矿床之一,除已经勘查评价的Au、Fe、Cu、Pb、Zn等元素外,还伴生有一定量的W元素等有益组分。文章对北衙金多金属矿床万硐山矿段及外围马头湾和南大坪矿区中的钨矿化开展系统的岩石学和矿物学研究,初步查明了万硐山矿段和其外围矿床中的钨矿化特征。研究发现,这些矿区(段)的含钨矿物主要为白钨矿,在万硐山矿段和马头湾矿区还有少量的黑钨矿产出;钨矿化主要产于岩体与围岩地层接触部位的矽卡岩或其退化蚀变岩中,白钨矿多充填在石榴子石等矿物的晶体间隙,个别被石榴子石包裹(南大坪矿区);万硐山矿段和马头湾矿区中的白钨矿具有较高的w(Mo)。这些特征表明,北衙地区的钨矿化作用与典型矽卡岩型白钨矿矿床基本一致。万硐山矿段中白钨矿交代黑钨矿的过程与磁铁矿的结晶过程密切相关,暗示钨矿化与铁、金矿化作用是同一成矿作用的产物。北衙地区的区域土壤W元素地球化学异常具有良好的浓度分级,且部分异常中心与已知的矿床/点明显对应,说明北衙地区具有良好的钨矿找矿潜力,白钨矿和黑钨矿均可以作为找矿标志性矿物,而Mo元素地球化学异常则可以作为间接找矿标志。The Beiya deposit is one of the newly discovered super-large skarn-porphyry gold polymetallic deposits in recent years in Yunnan Province,China.This deposit is characterized by giant Au,Fe,Cu,Pb,Zn,and S reserves,tungsten mineralization was also reported.In this paper,we present detailed studies on petrology and mineralogy of the tungsten mineralization in the Wandongshan ore zone of the Beiya deposit and outside Matouwan and Nandaping prospects.Geological characteristics indicate that scheelite is the major tungsten-bearing mineral in the Beiya area,while minor wolframite presents in the Wandongshan ore zone and Matouwan prospect.The tungsten mineralization was mainly occurred in skarn or their retrograde rocks which located at the contact between Wandongshan stock and surrounding sedimentary rocks.Scheelite filled in the interstitial spaces between garnet crystals and other minerals,or occurs as inclusions in garnet(Nandaping prospect).Scheelite grains from Wandongshan ore zone and Matouwan prospect are enrich in Mo content.Tungsten mineralization in Beiya area shares a lot of features analogous to typical W skarn deposit.The replacement of wolframite by scheelite from the Wandongshan ore zone is closely related to forming process of magnetite,suggesting that mineralization of tungsten,iron and gold are products of the same ore-forming process.The regional geochemical anomalies of W element in Beiya area show a good anomalous concentration zoning,and the anomalous centers have clear corresponding relationship with known deposits or prospects,indicating that the Beiya area has a great potential for finding tungsten deposit.Both scheelite and wolframite can be used as indicator minerals for prospecting,whileMo element anomaly can be used as indirect prospecting indication for tungsten deposit exploration.

关 键 词：地质学 钨矿化 矽卡岩-斑岩型矿床 白钨矿 金沙江-哀牢山成矿带 北衙 

分 类 号：P618.67[天文地球—矿床学]