安徽南陵姚家岭锌金多金属矿床金矿物特征研究
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摘要
安徽南陵姚家岭锌金多金属矿床中金矿物以独立矿物自然金为主,伴有少量银金矿。自然金粒度集中在10～74μm,形态为角粒状、长粒状、枝丫状等。自然金主要以包体金、晶隙金、裂隙金赋存于黄铜矿、黄铁矿、闪锌矿、方解石等。利用计数颗粒统计和面积统计两种方法分别对金矿物进行形态、粒度、存在状态的特征统计,显示不同类型金矿物在出现率和面积配分特征上有较大差别。通过金的配分计算,粒间金和裂隙金占总金量的53.49%,包体金主要载体为黄铜矿,其次为黄铁矿、闪锌矿、方铅矿及少量脉石矿物,金回收率最高达61.98%。化学成分中普遍存在Fe、Cu、Zn、Te、Bi。成色为682.5～960.1,平均855.5,结合Au、Ag含量与温度的关系,显示金矿物形成于中温中深成成矿环境。
The main gold mineral in Nanling Yaojialing gold deposit is single native, together with minor electrum. The gold minerals are commonly angular granular, long granular, branches-like, with grain size in the range of 10～74 um in diameter. They occur mainly in gold bearing minerals such as chalcopyrite, pyrite,sphalerite and calcite, in the form of inclusion gold, intercrystalline gold and fissure gold. The authors made statistical analysis of the shapes, grain sizes and modes of occurrence of gold minerals by using quantity statistical method and area statistical method, and the results indicate that different gold minerals show remarkable differences in occurrence rate and distribution. Gold-bearing minerals generally contain iron,copper, zinc, tellurium and bismuth. Through the distribution calculation of gold, it can be inferred that intercrystalline gold and fissure gold account for 53.49% of total amount of gold, the main inclusions gold bearing mineral is chalcopyrite, followed by pyrite, sphalerite, galena, and a small amount of gangue mineral.The gold recovery rate was up to 61.98%. The average gold fineness ranges from 682.5～960.1 with an average of 855.5. Combined with the relationship between the temperature and the Au-Ag content, the gold minerals formed in an medium temperature and during-deep deposition environment.
The main gold mineral in Nanling Yaojialing gold deposit is single native, together with minor electrum. The gold minerals are commonly angular granular, long granular, branches-like, with grain size in the range of 10～74 um in diameter. They occur mainly in gold bearing minerals such as chalcopyrite, pyrite,sphalerite and calcite, in the form of inclusion gold, intercrystalline gold and fissure gold. The authors made statistical analysis of the shapes, grain sizes and modes of occurrence of gold minerals by using quantity statistical method and area statistical method, and the results indicate that different gold minerals show remarkable differences in occurrence rate and distribution. Gold-bearing minerals generally contain iron,copper, zinc, tellurium and bismuth. Through the distribution calculation of gold, it can be inferred that intercrystalline gold and fissure gold account for 53.49% of total amount of gold, the main inclusions gold bearing mineral is chalcopyrite, followed by pyrite, sphalerite, galena, and a small amount of gangue mineral.The gold recovery rate was up to 61.98%. The average gold fineness ranges from 682.5～960.1 with an average of 855.5. Combined with the relationship between the temperature and the Au-Ag content, the gold minerals formed in an medium temperature and during-deep deposition environment.
引文
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[2]黄建满,韩长生.姚家岭矿床控矿因素分析及找矿方向预测[J].安徽地质,2012,22(1):12-18.
[3]文春华,徐文艺,钟宏,等.安徽姚家岭锌金多金属矿床地质特征与浅部矿化流体包裹体研究[J].矿床地质,2011,30(3):533-546.
[4]占昌帆.安徽省姚家岭铜多金属矿床地质和成矿流体研究[D].北京:中国地质大学(北京),2013.
[5]刘绍锋.安徽铜陵姚家岭锌金多金属矿床成矿作用研究[D].北京:中国地质大学(北京),2012.
[6]周文雅,许德明.安徽白岭金矿金的赋存状态研究[J].岩石矿物学杂志,1990,9(1):69-77.
[7]章增凤.山东招远罗山金矿自然金的标型特征研究[J].黄金,1989,10(1):21-20.
[8]吴尚全,杨翼,宋群.吉林珲春三道沟金矿床砂金的成因矿物学研究[J].地质论评,1991,37(3):274-282.
[9]张永峰,耿洪,吕作刚.翼北东坪金矿自然金标型特征[J].辽宁地质,1998(4):261-265.
[10]孟繁聪,孙岱生,寸王圭.胶东金矿金成色及其指示意义[J].黄金地质,1998,4(4):30-32.
[11]廖香俊,范国传.金厂峪、峪耳崖金矿自然金的标型特征及其意义[J].岩石矿物学杂志,1995,14(2):170-178.
[12]钱定福,李玉衡,李志生,等.金牙金矿床金的赋存状态研究[J].地质论评,1988,34(4):361-368.
[13]栾文楼,邵克忠.祈雨沟金矿自然金的标型特征及其找矿意义[J].岩石矿物学杂志,1995,14(1):65-70.
[14]梁俊红,刘海波,王建国,等.自然金的标型及成色特征在金矿床研究中的意义[J].黄金,2000,21(12):1-5.
[15]李成禄,李胜荣,罗军燕,等.山西繁峙义兴寨金矿床金矿物特征研究[J].中国地质,2011,38(1):119-128.
[16]卢振权,陈学明,朱成伟,等.河北青龙三家子金矿矿物学特征[J].中国区域地质,2000,19(3):330-335.
[17]吕宪俊,范海宝,邱俊,等.胶东蚀变岩型金矿石工艺矿物学性质研究[J].岩矿测试,2012,31(1):184-188.
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