江西大山尾矿区铌钽矿地质特征及找矿标志研究

Geological characteristics and prospecting direction of gold and antimony polymetallic ore in Dashanwei mining area of Jiangxi province

大山尾矿区是江西会昌地区新发现的铌钽矿矿床,矿区成矿地质条件有利,前景可佳,极具开发价值。矿区位于武夷山北北东隆起带西南侧,属于石城-安远北北东隆起带的中段与武夷山环状构造复合部位。经过数年的地质勘查手段,发现矿区内钽铌矿属风化壳型钽铌矿矿床,明确了区内花岗岩体早白垩世严坑单元,早白垩老安背单元和旱叫山单元以及晚三迭世荷树崠单元空间分布和接触关系,它们呈同心环状产出。旱叫山单元的细粒斑状碱长花岗岩是区内铌钽矿的成矿母岩。

Dashanwei mining area is a new Nb-ta deposit in Huichang area,Jiangxi Province,with favorable metallogenic geological conditions and promising prospects.The mining area is located in the southwest of the NNE uplift belt of Wuyi Mountain,which belongs to the middle part of shicheng-Anyuan NNE uplift belt and the composite part of wuyi Mountain ring structure.After several years of geological exploration,it is found that tantalum-niobium deposit belongs to weathered crust tantalum-niobium deposit,and the spatial distribution and contact relationship of granite bodies in the area are defined as early Cretaceous Yankeng unit,Early Cretaceous Laoanbei unit and Hanbaishan Unit,and late Triassic Helshuling unit,which are concentric and annular.The fine-grained porphyritic alkali feldspar granite in Hanbaishan unit is the ore-forming parent rock of niobium and tantalite in the area.