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准苏吉花高-中温热液脉型铜钼矿床是近年来中蒙边境新发现的众多中型铜钼矿床之一,矿体主要赋存在二叠纪花岗闪长岩中,仅少量产于宝力高庙组变质粉砂岩中,多呈透镜状产出,具尖灭再现现象。矿床稀土元素组成特征表明:花岗闪长岩和闪长岩脉稀土配分模式相似,表现为强负Eu异常和极弱或无负Ce异常,为同源岩浆演化的产物。变质粉砂岩稀土组成与岩浆岩截然不同。辉钼矿矿石稀土元素组成大致可分为两组:一组矿石表现为明显的负Eu异常,Ce表现为由弱异常过渡为无异常的特征,与矿区花岗闪长岩稀土组成相似;另外一组矿石表现为弱负Eu异常和极弱负Ce异常,介于花岗闪长岩与变质粉砂岩稀土元素组成之间,暗示成矿过程中岩浆热液与地层之间发生了水/岩交换。说明区内成矿物质一部分来源于花岗闪长岩,另一部分来源于宝力高庙组变质粉砂岩。矿石δEu值指示矿石沉淀于高温、低氧的相对还原环境。
The quasi-Sujihua high-medium temperature hydrothermal vein-type copper-molybdenum deposit is one of the many medium-sized copper-molybdenum deposits newly discovered in the Sino-Mongolian border in recent years. The ore body mainly exists in the Permian granodiorite, with only a small amount Produced in Baolianggaomiao metamorphic siltstone, mostly lenticular output, with the extinction phenomenon. The characteristics of the REE composition of the deposit indicate that the granodiorite and diorite veins have similar distribution patterns of rare earth elements, showing strong negative Eu anomaly and very weak or no negative Ce anomaly, which are the products of the evolution of the same magma. Metamorphic siltstone REE composition and magmatic rocks are completely different. The REE composition of molybdenite ore can be roughly divided into two groups: one group shows obvious negative Eu anomaly, and Ce shows the transition from a weak anomaly to an anomaly, which is similar to the composition of the rare earths in the granodiorite in the ore district; A group of ores show the weak negative Eu anomaly and the very weak negative Ce anomaly, which is between the REE of granodiorite and metamorphic siltstone, suggesting that water / rock occurred between the magmatic hydrothermal fluid and the formation exchange. It shows that the ore-forming materials in the area are partly derived from granodiorite and the other is from the metamorphic siltstone of Baolianggaomiao Formation. The δEu value of the ore indicates that the ore deposits in the relative reduction environment of high temperature and low oxygen.