甘肃阳山金矿岩(矿)石中金的化学相态分析

doi:10.13278/j.cnki.jjuese.20180052

摘要/Abstract

摘要： 本文采用石墨炉原子吸收光度计测定了甘肃阳山金矿岩（矿）石中金的5种化学相态（可溶相、游离自然金、碳酸盐相、硫化物相和硅酸盐相）的质量分数，并分析了其在不同类型的岩（矿）石和不同时代地层中的分布特征。结果表明：区域岩石中的金主要以硅酸盐相存在，占总量的57.6%；矿石中的金主要以硫化物相存在，占总量的56.9%；与岩石中金的相态分布对比，矿石中硫化物相金、游离自然金和碳酸盐相金所占比例明显偏高；可溶相、游离自然金、碳酸盐相和硫化物相是阳山金矿成矿有利相态；赋矿地层金的成矿有利相态所占比例明显高于其他地层，即使金的合计与其他地层相近甚至较低。可根据成矿有利相态所占比例判断地层成矿潜力，这为岩石地球化学的异常评价提供了新的依据。

关键词: 类卡林型金矿, 化学相态分析, 金, 硫化物相, 阳山金矿

Abstract: We used graphite furnace atomic absorption section spectroscope to determine the content of five gold chemical phases (soluble phase, free natural gold, carbonate phase, sulfide phase, and silicate phase) in the ores and rocks of the Yangshan Carlin-like deposit in Gansu Province, and identified their distributions in different rocks/ores. According to the results, the major phase in rocks is silicate phase which accounts for 57.6%. In ores, sulfide phase accounts for 56.9%,the highest proportion among the five phases. The proportions of free natural gold, carbonate phase and sulfide phase in ores are much higher than those in rocks. Soluble phase, free natural gold, carbonate phase and sulfide phase are favorable metallogenic phases. The proportions of favorable metallogenic phases in the host strata are obviously higher than those in other strata. This can be used to infer the metallogenic potential of strata and provide a reference for the evaluation of petro-geochemical anomalies.

Key words: carlin-like deposit, chemical phase analysis, gold, sulfide phase, Yangshan deposit

中图分类号:

P618.51

陆继龙, 范玉超, 熊玉新, 尹业长, 赵玉岩. 甘肃阳山金矿岩(矿)石中金的化学相态分析[J]. 吉林大学学报(地球科学版), 2019, 49(4): 992-1000.

Lu Jilong, Fan Yuchao, Xiong Yuxin, Yin Yechang, Zhao Yuyan. Chemical Phase of Au in Rock/Ore and Significance of Yangshan Gold Deposit, Gansu Province[J]. Journal of Jilin University(Earth Science Edition), 2019, 49(4): 992-1000.

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