山东谢家沟金矿床矿石与金矿物特征

新发现的谢家沟大型金矿床位于山东招远市西南部, 对其进行详细的宏观、微观矿石学基础研究, 包括矿石类型和成矿期次的划分以及金矿物的成色等, 对指导该区找矿具有重要意义.矿石类型划分为原生矿石和氧化矿石, 其中原生矿石分为黄铁绢英岩、黄铁矿-黄铜矿绢英岩、多金属硫化物绢英岩和黄铁矿-黄铜矿石英脉等4类, 它们分布于脆-韧性剪切带不同部位, 成矿作用方式有差别.成矿期次分2期5阶段.金的赋存状态主要有包体金、晶隙金和裂隙金, 金矿物成色平均值为844.19, 为中深成矿作用产物, 其中包体金成色均值为859.96, 晶隙金为843.83, 裂隙金为833.08, 反映从包体金至晶隙金再到裂隙金的成矿作用温度是逐渐降低的. 

Ores and Gold-Bearing Characteristics in Xiejiagou Gold Deposit, Shandong Province

Xiejiagou gold deposit,discovered in 2002,is located in the southwest of Zhaoyuan City,Shandong Province.The detailed study of macroscopic and microscopic perspectives of ores in Xiejiagou gold deposit reveals two types of gold-bearing ores:primary ores and oxidized ores.The primary ores,classified as pyritization and sericitization-silication granite,chalcopyritization-pyritization and sericitization-silication granite,multi-sulfide and sericitization-silication granite,and chalcopyrite-pyrite quartz vein,are located at different positions in the brittle-ducility shear-zone,reflecting 2 periods and 5 stages of metallization process.The gold occurred mainly in gold inclusion,between minerals and in cracks.The average gold fineness is 859.96 in gold inclusion,843.83 between minerals,and 833.08 in cracks,respectively,indicating that the gold mineralization occurred in the middle and deep layers and that the temperature of mineralization decreased gradually from the gold inclusion,between minerals and in crack.