摘要
龙头沟金矿是南秦岭柞水—山阳矿集区内的一处中型金矿床,主要载金矿物为黄铁矿。通过对Ⅰ-1号和Ⅳ-1号主矿体的黄铁矿晶形及化学成分标型特征进行研究,结果表明:矿石矿物黄铁矿晶形较为简单,以五角十二面体占比最高,总体上晶形出现率由高到低依次为五角十二面体、聚形、立方体和八面体;1 160 m中段矿化最强,其次为1 080 m中段,五角十二面体黄铁矿载金性优于其他晶形;黄铁矿的S含量为52.71%~67.80%,平均值为55.79%,Fe含量为28.66%~45.33%,平均值为42.43%,总体为富硫亏铁型;Co/Ni比值介于1.38~13.33之间,平均值为2.88,Se含量约为4×10^(-4),S/Se比值介于0.76×10^(3)~5.39×10^(3)之间,表明龙头沟金矿为岩浆热液成因;晶形得分数X和D值分别为0~-13.33、0.652~1.089,基本位于矿体中下部位。结合地表矿体出露和剥蚀情况,认为深度仍具有一定找矿潜力,尤其是主矿区155线以东1 080 m中段下部和矿区以西香沟地区仍有找矿潜力。
Pyrite is the main gold-bearing mineral in Longtougou gold deposit.In this paper,the crystal morphology and chemical composition typomorphic characteristics of pyrite inⅠ-1 andⅣ-1 orebodies were studied from the perspective of minerals,and five points of insights were obtained.The research methods include optical thin section observation under microscope,electron probe,energy spectrum analysis,etc.The results show that the crystal morphology of pyrite in the study area is relatively simple,and pentagonal dodecahedron crystal morphology occupies the highest proportion.In general,the probability of pyrite crystal morphology from high to low is pentagonal dodecahedron,poly,cube and octahedron.The 1160 m middle section of the study area is the most mineralized section,and the 1080 m section is the secondary mineralized section,and pentagonal dodecahedral pyrite is superior to other crystal morphology in gold bearing.The w(S)is 52.71%to 67.80%,with an average of 55.79%,and the w(Fe)is 28.66%to 45.33%,with an average of 42.43%in pyrite.In general,the pyrite in this area is sulfur-rich and iron-deficient.Co/Ni values range from 1.383 to 13.333,with an average value of 2.88,w(Se)is about 4×10^(-4),and S/Se ratios range from 0.76×10^(3) to 5.39×10^(3),indicating that the formation of Longtougou gold deposit is related to volcanic hydrothermal genesis.The score X of crystal morphology and D value range from 0 to-13.33 and 0.6520 to 1.1345 respectively,indicating that the ore body is basically located in the middle and lower part,that is,the engineering control section of the mineralization area is still in the middle and shallow part.There is still prospecting potential in the east of line 131 below 1080 m middle level and Xianggou area to the west of Longtougou gold area.
作者
寸小妮
薛玉山
王瑜亮
刘新伟
CUN Xiaoni;XUE Yushan;WANG Yuiang;LIU Xinwei(Xi’an Northwest Nonferrous Geological Research Institute Co.,Ltd.,Xi’an 710054,Shaanxi,China)
出处
《黄金科学技术》
CSCD
2023年第1期64-77,共14页
Gold Science and Technology
基金
西安西北有色地质研究院有限公司科研基金项目(编号:2017J02,2020J02)资助。
关键词
黄铁矿
晶形特征
成分标型
找矿预测
岩浆热液型金矿床
龙头沟金矿
陕西省
pyrite
crystal morphology characteristic
composition typomorphic
prospecting prediction
magmatic hydrothermal gold deposit
Longtougou gold deposit
Shaanxi Province
