鄂东北金家沟白钨矿床地质特征、控制因素与矿化模式讨论

Geological Characteristics,Control Factors and Metallogenic Modelof the Jinjiagou Scheelite Deposit in Northeastern Hubei

金家沟钨矿床是鄂东北地区近年新发现的白钨矿产地之一,矿(化)体呈似层状、透镜状和脉状,产出于矽卡岩及NNE向断裂破碎带中,矿化类型有层控矽卡岩型和构造控制的石英脉型、蚀变碎裂岩型。通过成矿地质条件、矿床地质特征、控制因素的分析,认为大别岩群内大理岩与钨成矿关系密切,层控矽卡岩型钨矿(化)体的定位受横冲复式背斜与硅钙界面的控制,NNE向断裂破碎带则控制石英脉型与蚀变碎裂岩型钨矿(化)体的产出,早白垩世中酸性岩浆活动为成矿提供物源与热源。白钨矿矿化类型在空间分布上总体具有上部为石英脉型与蚀变碎裂岩型、下部为层控矽卡岩型的特征,并据此构建“下层上脉”的立体矿化模式。

The Jinjiagou tungsten deposit as a newly discovered scheelite deposits in the northeastern Hubei Province in recent years.The ore(mineralized)bodies are stratoid,lenticular and vein-like in skarn and NNE-trending fracture zone,and the types of mineralization are layered skarn,quartz vein,altered fracture type.Based on the description of the geological conditions and geological characteristics of deposit,the ore-controlling factors are analyzed.It is believed that the marbles in the Dabieshan(rock)group are closely related to tungsten mineralization.The location of the layered skarn-type bodies are controlled by the transverse complex anticline and the interface of silicon-calcium.The NNE faults control the occurrence of the quartz vein-type and the altered fracture-type bodies.The Early Cretaceous medium-acid magmatic activity provide mineral source and heat.The spatial distribution of scheelite mineralization type generally has the characteristics which are quartz vein type and altered fracture type upper,and layer skarn type lower.Based on this,the model of“lower layer and upper vein”is constructed.