【作者】 郑杰；

【导师】 余大龙；

【作者基本信息】 贵州大学 ， 矿物学·岩石学·矿床学， 2009， 硕士

【摘要】 黔东锦屏八克金矿床以金高度富集,矿体和围岩中广泛出现毒砂和黄铁矿而与该区其它金矿有明显区别。本文以成因矿物学和找矿矿物学的理论和方法为指导,在前人对该矿床的地质背景、成矿条件、矿床地球化学等方面进行分析的基础上,利用现代测试技术和手段对该矿区中产出的毒砂和黄铁矿进行了标型特征研究,填补了研究空白,从另一个角度取得了矿床成因方面的重要信息。矿体含金毒砂粒度小,结晶程度差,晶胞参数接近理论值,热电性为N型电热场且均值在-195.（?）V·℃^-1明显低于围岩值,化学成分中S/As大于1,Fe/（As+S）小于0.5,探针下颗粒较为破碎,裂隙发育,并出现有伴生矿物方铅矿填充。矿体含金黄铁矿形成于矿体边部及上部,细粒,结晶程度差,晶胞参数与理论值一致,热电性为P型电热场且热电系数为正值,形成温度多在234.0℃～311.3℃之间,化学成分中S/Fe大于1,为为富硫型黄铁矿,针下颗粒较为破碎,裂隙发育。稀土元素和微量元素研究结果表明,毒砂、黄铁矿在矿体内REE明显低于围岩中的REE,铕呈现强烈的负异常;成矿流体中富集亲硫元素和LREE,亏损HFSE,成矿流体为具有弱还原性的富Cl型体系;通过对Y/Ho、Zr/Hf、Nb/Ta和Co/Ni比值的研究,推断八克金矿是一种岩浆热液型的中温矿床。更多还原

【Abstract】 Bake gold deposit highly enriched in gold,ore and rock in the widespread arsenopyrite and pyrite and other gold and the area has a clear distinction,based on the analysis of the geolo ical background of the typical tin deposits,the regional geological conditions of mineralization,the formation mechanism, the paper applies theories and methods of minerageny and prospecting mineralogy,uses the modern testing technology,to study the typomorphic characteristics of arsenopyrite and pyrite in Bake gold deposit.Research to fill gaps,from another point of view the genesis of ore deposits have made the important information.Gold-bearing arsenopyrite ore bodies of small size,poor crystallinity,unit cell parameters close to the theoretical value of for the N-type thermoelectric electric field and average in-195.6μV·℃-1 value was significantly lower than surrounding rock,the chemical composition of S / As more than 1,Fe /(As +S) is less than 0.5,more broken particles under probe,fracture,and there are associated minerals galena filling.The formation of ore containing gold,iron ore in the ore body and the upper edge,fine-grained, poor crystallinity,unit cell parameters consistent with the theoretical value and power of electric field for the P-type thermoelectric coefficient and positive temperature to form more 234.0℃～311.3℃between the chemical constituents in the S / Fe is greater than 1,as for the type of sulfur-rich pyrite, needles under the particles is more broken fracture.The result of study on rare earth elements and trace elemental indicates,orebody of pyrite and arsenopyrite REE is obviously lower than the country rock REE;the ore_forming fluid collect LREE and sulphophile element strongly and richly,lose HFSE,the ore_forming fluid is a fluid system of rich Model C1 to mineralize and have weak reducibility;through the study on Y/Ho,Zr/Hf,Nb/Ta and Co/Ni ratio,infer that Bake gold deposit is a medium tempe.ature deposit of magmatic hydrothermal.更多还原