广西栗木锡-铌-钽矿床中氟的作用及地表找矿评价标志  

F effect on the Limu Sn-Nb-Ta deposit with its prospecting evaluating indication on surface,Guangxi

作　　者：覃宗光[1] 姚锦其[1] 

机构地区：[1]桂林矿产地质研究院,广西桂林541004

出　　处：《矿产与地质》2008年第1期1-5,共5页Mineral Resources and Geology

摘　　要：广西栗木多金属矿从上到下除有长石石英脉型锡-钨矿床、花岗伟晶岩脉型锡-钽-铌矿床外,还有含锡、铌、钽花岗岩原生矿床。本次对矿区内的地层、岩体、矿体中氟含量进行了研究并结合实验资料,认为燕山早期复式花岗岩体中富含的氟是成矿元素W、Sn、Nb、Ta的重要携带剂,对W、Sn、Nb、Ta从岩浆熔体中分出、迁移、富集及矿化分带起了重要作用,氟虽是寻找盲矿体的重要远程指示元素之一,但氟不是成矿元素,含矿岩体地表岩石中通常除有F、Be强异常外,W、Sn、Cu、Li等元素还会形成强异常组合;含矿岩体地表萤石—云母细脉带中w(F)一般>30000×10-6,w(Be)>1000×10-6,w(Sn)>300×10-6,w(W+Sn)>400×10-6,F/(W+Sn)和F/Sn<110;含矿岩体地表长石石英脉带中w(F)>10000×10-6,w(W)>80×10-6,w(Sn)>500×10-6,F/(W+Sn)和F/Sn<50;不含矿岩体的地表岩石及细脉带中各指标含量则与之相反。From the top down, the Limu polymetallic deposit in Guangxi hosts feldspar-quartz vein type Sn-W deposit, granite-pegmatite vein type Sn-Nb-Ta deposit as well as primary granite deposit bearing Sn, Nb, Ta. According to the research on F content of the strata, rockbodies and orebodies of this ore area with the experimental documents, it has believed that the F element enriched in composite granite of Early Yanshanian is a significant carrying agent for ore-forming elements of W, Sn, Nb, Ta, which is very important to the isolation, transfer, enrichment and mineralization zoning of W, Sn, Nb, Ta from magmatic fusant. Although F is one of the significant long-distance indicating elements, yet it is not an ore-forming element. Besides the strong anoma ies of F, Be in the surface rocks from the rockbodies bearing minerals, there is also a combination of strong anomalies of W, Sn, Cu, Li and etc; the F content in the surface fluorite-talc thin vein of the rockbodies bearing minerals is usually more than ：30000 ×10^-6 with Be content more than 1000×10^-6,Sn content more than 300×10^-6, W-kSn content more than 400×10^-6, F/（W＋Sn） with F/Sn less than 110, while the F content in the feldspar-quartz vein of ore-bearing rockbodies is more than 10000×10^-6 with W content more than 80×10^-6, Sn content more than 500×10^-6, F/（W-kSn） with F/Sn less than 50; the indicators content in the surface rocks and thin veins of the rockbodies bearing no ores is reverse to the aforementioned situation.

关 键 词：锡-铌-钽矿 氟 迁移 富集 找矿评价标志 栗木 广西 

分 类 号：P618.44[天文地球—矿床学] P618.79[天文地球—地质学]