广东省瑶岭钨矿床地质特征及控矿因素分析

Geological characteristics and ore-controlling factors analysis of Yaoling tungsten deposit in Guangdong Province

瑶岭钨矿是南岭成矿带粤北梅石瑶矿田中重要的石英脉型矿床,具有中型规模,周边具有矽卡岩型矿化,深部发现了云英岩型矿化,研究瑶岭钨矿的控矿因素对判断矽卡岩型、云英岩型矿化的找矿方向具有重要意义。瑶岭钨矿的北西组中组矿脉表现单脉型;北西组北组及南北组矿脉表现为浅部细脉、薄脉、往深部合并成大脉,具有典型的"五层楼"特征。充填于竹园断裂中石英斑岩的产状控制北西组中组矿脉的钨矿化强度;钨矿体赋存于竹园大断裂的上、下盘附近1500～2000 m范围内;赋存于竹园断层上盘的钨矿体规模大,矿化较强;下盘的矿化及规模都较小。通过对矿床地质特征及矿化分布规律的分析,并通过研究矿体的产状、富矿段赋存位置与矿脉厚度的关系、矿化强度与构造的关系,推断了竹园断裂控矿构造的作用。这对明确瑶岭矿区找矿方向具有重要意义。通过钻孔分析第三阶段隐伏的细-中粒白云母花岗岩;进入这一岩体之后的钨矿脉,钨矿化显著减弱而钼矿化有增强现象,且脉幅显著变小甚至尖灭;结合岩体顶部发育与矿化有关的云英岩化、电气石化、硅化等热液蚀变,推断控矿岩浆岩是第三阶段侵入的隐伏细-中粒白云母花岗岩。

Yaoling tungsten deposit is an important quartz vein type deposit in Meishiyao ore field of northern Guangdong Province in Nanling metallogenic belt.It has medium scale and skarn type mineralization around it.The greisen-type mineralization has been found in deep part.It is important to study the ore-controlling factors of Yaoling tungsten deposit for judging the prospecting direction of skarn type and greisen-type mineralization.The veins in the middle of the north west group in Yaoling tungsten mine are single vein type,while they in the north and south of the north west group are of fine or thin veins in the shallow,and merge into large veins in the deep,with typical"five-storey buildings".The occurrence of quartz porphyry filling in the Zhuyuan fault controls the tungsten mineralization intensity of veins in the middle of the north west group;the tungsten ore bodies occur in the range of 1500-2000 m near the upper and lower walls of the Zhuyuan fault;the tungsten ore bodies occur in the upper wall of the Zhuyuan fault have large scale and strong mineralization,while the mineralization and scale are small when they in the lower wall of the fault.On the basis of the analysis on the geological characteristics and mineralization distribution of the deposit,studied the occurrence of the ore body and the relationship between the occurrence position of the rich ore section and vein thickness,and studied the relationship between mineralization intensity and tectonics,the role of the ore-controlling structure Zhuyuan fault was inferred.This is of great significance for defining the prospecting direction of Yaoling mining area.The result of the study on the buried fine-medium-grained muscovite granite in the third stage showed that,the tungsten mineralization decreases significantly while the molybdenum mineralization increases when tungsten veins stretch down into the rock body,and the amplitude of the vein decreases significantly or even pinches out;at the top of the rock body there exist the hydrothermal alteration which correlate with mineralization such as greisenization,tourmalinization and silicification,suggesting that the ore-controlling magmatic rock is the third stage intrusion.