粤北白水寨石英脉型钨矿床地质特征及找矿前景

英德白水寨钨矿床位于粤北钨多金属成矿带雪山嶂矿田内,是近年来新发现的石英脉型钨矿床,初步探明储量已达中型规模。矿区浅部发育白钨矿线脉-细网脉密集带,往深部演化成黑钨矿细脉带,并在钙质地层发育地段形成了白钨矿体。与典型的石英脉型钨矿相比,该矿床具有浅部线细网-细脉带钨矿物"上白钨矿下黑钨矿"、发育细网脉与矽卡岩共存的白钨矿(化)体、矿石矿物组合中出现大量黄铁矿的特征,但总体属于石英脉型钨矿床,深部含矿岩浆热液是成矿的重要条件。详细的野外勘探资料显示,该矿床已具有"五层楼"成矿规律的雏形,物探成果指示深部岩体埋深0.5~1.2 km,而地表-浅部矿化带处于"五层楼"模式的细网脉标志带-细脉带的空间位置,矿区深部勘查脉带型钨矿有很大空间。

Geological Characteristics and Prospectiong Potential of the Baishuizhai Quartz-vein Type Tungsten Deposit,Northern Guangdong Province

The Baishuizhai quartz-vein type tungsten polymetallic deposit in Yingde city is a newly found middle-sized tungsten deposit. It is located in the Xueshanzhang ore district of the northern Guangdong tungsten polymetallic zone in the Nanling Range. Unlike the typical quartz-vein type wolframite deposits in the Nanling Range, the Baishuizhai tungsten deposit is characterized by zonation of ore minerals, i.e.,scheelite uppermost and wolframite in the deep of the veinlet zone, coexistence of veinlet and minor skarn, and abundant pyrite mineralization. Quartz veins and veilets are the dominant ores and the sulfur-rich magmatic-hydrothermal fluid plays an important role in pyrite mineralization. Detailed fieldtrip investigation, the Baishuizhai tungsten deposit has some similar features with the "Five Floor Zonation" model. Geophysical prospecting indicates that there is a hidden granitic pluton 0.5–1.2 km underground. Considering that the explored shallow veinlet zone of the deposit is distributed uppermost, it may have a promising deep resource for the ore prospect.