江西分宜下桐岭地区钨矿地质特征与成矿预测

On geological properties and metallogenic prognosis of Xiatongling tungsten deposit in Fenyi of Jiangxi

江西省分宜县下桐岭钨(钼铋)多金属矿床,以花岗岩体内、外的网脉型钨钼铋矿化为主,并发育少量大脉型钨钼铋矿体。在进行江西省钨矿资源潜力评价时,对该矿床1号、2号花岗岩体及钨矿成矿特征进行了资料收集和综合研究。按全国矿产资源潜力评价矿产预测有关技术要求,将其划归为岩体型钨矿,所在区域的预测类型归入"下桐岭式"岩体型。通过对该典型矿床地质特征、成矿要素、预测要素特征的综合分析,认为岩石类型、成矿时代、成矿环境、构造背景、矿体特征、控矿条件、化探和重砂异常是该钨矿的主要预测要素;在此基础上,对该预测工作区建造构造、成矿要素及预测要素等特征进行了归纳总结,认为大地构造位置、区域地层、区域主要断裂构造和区域岩浆岩、矿区断裂构造和成矿岩体、矿化类型、控矿断裂和地球化学异常特征等,是该区钨矿主要预测要素,并圈定了8个最小预测区。按地质体积参数法估算,其800 m以浅潜在资源量为24.98万t。

Located in Xiatongling of Fenyi in Jiangxi Province,the mineralization for W（ Mo-Bi） polymetallic deposit was majored in granite vine types and minor amount of large vein type W-Mo-Bi ore bodies. In the course of resources potential evaluation for tungsten in Jiangxi Province,the authors conducted systematic data collection and comprehensive studies on No 1 and 2 granite bodies and tungsten metallogenic characteristics. According to the related technical requirements of national mineral resources potential evaluation for minerals prognosis,the authors classified the deposit as rock type tungsten deposit,the prognosis type for the area as ‘Xiatongling mode’rock type. Through integrated analyses of typical deposit geological properties,metallogenic elements,prognosis elements,the authors considered that rock types,ore-forming epoch,ore-forming environment,tectonic settings,ore body properties,ore-control conditions,geochemical exploration and heavy placer mineral anomalies constituted the main predicting elements of tungsten deposit.The authors summarized the features of formations and structures,ore-forming elements,prognosis elements in the prognosis working area,considered geotectonic location,regional stratigraphy,regional major fractures,regional magma and mine faults,ore-forming rock mass,mineralization types,ore-control fractures and geochemical anomaly were the prognosis elements for the tungsten deposit in the study area. Eight minimum prediction areas were delineated,and by geological volume parameter method,the potential resource volume down to 800 m was estimated about 249. 8 kt,indicating a broad prospect of‘Xiatongling mode’tungsten deposit in the study area.