冀北寿王坟铜钼多金属矿地质特征及找矿前景

Geological characteristics and prospecting direction of Shouwangfen Cu-Mo polymetallic deposit,northern Hebei

寿王坟地区广泛发育白垩纪花岗岩,结合地球化学特征和成矿元素分布特征对成矿的控制作用综合分析,认为寿王坟侵入岩为高钾钙碱性准铝质花岗岩含部分钾玄质花岗岩共同组成的杂岩体。在岩浆分离结晶过程中,有较多的斜长石晶出,从而导致了残余熔体中的Eu负异常,同时还具有轻微的铈负异常。其成因类型为I型花岗岩与S型花岗岩共同存,其构造环境属于板块碰撞后隆起期花岗岩-造山晚期花岗岩。中酸性岩体成矿元素分布特征显示出岩体中成矿物质含量、变异系数是鉴别岩体含矿性的有效标志,其中细粒花岗岩与钼矿的形成关系最为密切。同时在断裂交切部位和强烈破碎带中的铅锌矿化脉体密集部位存在Cu、Mo矿化,甚至Cu、Mo矿床可能性较大,具有较大的找矿潜力。

The Cretaceous granites are widely developed in Shouwangfen area,combined with a comprehensive analysis,control the distribution characteristics of geochemical characteristics and oreforming elements of mineralization that Shouwangfen intrusive rocks are high-k calc alkaline intrusive complex quasi-aluminous granite containing part of Potassic granite together.In the magmatic crystallization process,there are many Shi Jing plagioclase resulting in the residual melt,negative Eu anomalies,but also has a slight negative CE anomaly.The genetic type is I type granite,which is associated with S type granite.Its tectonic setting belongs to late orogenic granite and late orogenic granite.The distribution characteristics of ore-forming elements in medium acid rocks show that the content of minerals and the coefficient of variation are the effective indicators to identify the ore-bearing characteristics of the rock mass,among which fine-grained granite is most closely related to the formation of molybdenum deposits.At the same time,there is Cu and Mo mineralization in the lead-zinc mineralized veins of the fracture intersection and the strong fracture zone,and even the Cu and Mo deposits are more likely to have a larger prospecting potential.