青海省XX银多金属矿地质特征及成因研究

Geological Characteristics and Genesis of XX Silver Polymetallic Deposit in Qinghai Province

摘要: 该矿床为2001年发现，是目前青海省唯一发现的独立银矿床，位于昆仑山系鄂拉山铜多金属成矿带中部。矿体沿近南北向F₁断裂带及北东向次一级层间断裂(裂隙)构造带，呈似层状、条带状、透镜状、脉状产出，共圈定矿体28条、矿化体14条。矿石矿物主要为黄铁矿、毒砂、方铅矿、闪锌矿、黄铜矿、磁铁矿等。脉石矿物主要有石英、方解石、绢云母等。矿石结构主要为交代结构、半自行粒状结构、粒状结构、残余结构。主要构造为细脉浸染状构造、网脉状构造、条带状构造。蚀变主要为硅化、褐铁矿化、绢云母化、高岭土化、碳酸盐化等。从地层、控矿构造和岩浆岩方面分析了该矿床的控矿因素，并确定了找矿标志。研究认为，该矿床为构造控矿，属气水热液型银多金属矿床。

Abstract: The deposit was discovered in 2001 and is currently the only independent silver deposit discovered in Qinghai Province. It is located in the central part of Erasan Copper Polymetallic Metallogenic Belt in the Kunlun Mountain. The ore bodies are layered, striped, lenticular, and pulse along the near-south-north F1 fault zone and the secondary fracture northeast trend. And a total of 28 ore bo-dies have been identified. Ore minerals are mainly pyrite, arsenopyrite, galena, sphalerite, chalco-pyrite, magnetite etc. Gangue minerals mainly include quartz, calcite, sericite and so on. The ore textures are mainly metasomatic texture, semi-self granular texture, granular texture, and residual texture. The main structures are veinlet disseminated structures, network-like structures, and banded structures. The alterations are mainly silicification, limonite mineralization, sericitization, kaolinization, and carbonation. The ore-controlling factors of the deposit were analyzed from the aspects of strata, ore-controlling structures and magmatic rocks, and the prospecting mark was de-termined. It is considered that the deposit is a tectonic ore control ore, which belongs to the gas wa-ter hydrothermal type silver polymetallic deposit.