莱州纱岭金矿I-2号矿脉赋存特征及富集规律

Occurrence features and enrichment regulation of No. I-2 vein of Shaling gold mine in Laizhou

矿石的共生组合以及近矿围岩蚀变特征表明纱岭金矿I-2号矿脉矿化类型为蚀变岩型金矿,矿床成因类型属混合岩化-重熔岩浆热液型金矿床。焦家成矿断裂带中、深部存在第二矿化富集段。主要找矿标志有北东向压扭性断裂带、黄铁绢英岩化蚀变岩带、低磁场的线状串珠状异常带等指示标志以及特有的指示元素的组合异常;矿化富集规律为构造控矿及岩性控矿。金矿化的强弱依附于主要矿化阶段的发育及迭加程度,即当含有细粒黄铁矿细脉和多金属硫化物石英细脉或其相互迭加时往往形成厚而富的工业矿体,其在空间分布上,服从于矿体南西侧伏规律。

The symbiotic assemblage of ore and the characteristics of peri-rock alteration show that the mineralization type of No. I- 2 vein in Shaling gold mine is altered type gold deposit. The genetic type of the deposit is a migmatization-remelting magma hydrothermal gold deposit. There is a second mineralization enrichment section in the deep part of the Jiaojia metallogenic fault zone. It is characterized by the NE compression-torsional fault zone, beresitization alteration zone, linear and beaded low magnetic field anomaly zone, as well as the combination anomalies of specific indicator elements. The mineralization and enrichment is controlled by structure and lithology. The strength of gold mineralization depends on the development of the main mineralization stage and the degree of superposition, that is, when there are fine pyrite veins and polymetallic sulphide quartz veinlets or they overlap with each other, thick and rich industrial ore bodies are formed, with southwest dipping.