陕西省庞家河金矿黄铁矿标型特征及对深部找矿的启示  

Typomorphic characteristics of pyrites in the Pangjiahe gold deposit, Shaanxi Province and indication for deep ore prospecting

作　　者：卢飞 吕新彪[2] 杨帅 肖强 李军 任龙 LU Fei;LÜXinbiao;YANG Shuai;XIAO Qiang;LI Jun;REN Long(Brigade No.211 of Sino Shaanxi Nuclear Industry Group,Xi'an 710024,Shaanxi,China;Faculty of Earth Resources,China University of Geosciences,Wuhan 430074,Hubei,China;Sino Shaanxi Nuclear Industry Group,Xi'an 710000,Shaanxi,China;Key Laboratory of Mineralogy and Metallogeny,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China)

机构地区：[1]中陕核工业集团211大队有限公司,陕西西安710024 [2]中国地质大学(武汉)地质调查院,湖北武汉430074 [3]中陕核工业集团公司,陕西西安710100 [4]中国科学院广州地球化学研究所,矿物学与成矿学教育部重点实验室,广东广州510640

出　　处：《中国地质》2023年第1期277-288,共12页Geology in China

基　　金：陕西省地质勘查基金项目(61201304171)资助。

摘　　要：【研究目的】黄铁矿是庞家河金矿床最常见的金属矿物,也是最主要的载金矿物,其标型特征蕴藏着丰富的地质信息。【研究方法】本文选取矿区东段新发现的Ⅳ-2号矿体黄铁矿的形态标型、热电性标型和成分标型进行了系统分析。【研究结果】研究发现该矿体黄铁矿晶体形态以立方体和五角十二面体为主,具有高砷、亏铁和硫的特点,Fe/(S+As)含量平均值为0.860,Co/Ni比值主要集中在1~10。【结论】统计分析显示该矿床形成于浅成中低温环境中,成矿流体有明显的变质属性;黄铁矿热电性及形态的垂向变化规律,均表明深部找矿仍有一定的潜力,且初步计算表明至标高861 m向下矿体仍有186 m的延伸。[Objective] Pyrite is the most common metal mineral of the Pangjiahe gold deposit, and it is also the most important gold-bearing mineral. Its typomorphic characteristics contain abundant geological information. [Methods] This paper conducts systematic analysis and research by selecting the morphological typomorphic characteristic, pyroelectric typomorphic characteristics and compositional typomorphic characteristic of pyrite, which is newly discovered in IV-2 ore body in the eastern part of the deposit. [Results] It is found that crystal morphology of pyrite is mainly cubic and pentagonal dodecahedron, characterized by high arsenic, iron deficiency and sulfur. The average value of Fe/(S+As) is 0.860, and the ratio of Co/Ni is mainly concentrated between 1and 10. [Conclusions] The calculation shows that the deposit is formed in a shallow depth, medium-low temperature environment,and the ore-forming fluid has obvious metamorphic properties. The vertical variation of pyroelectricity and morphology of pyrite indicates that there is still potential for deep ore prospecting, and preliminary calculations indicate that there is still an extension of186 m downward ore at elevation of 861 m.

关 键 词：金矿 黄铁矿 标型特征 深部找矿 矿产勘查工程 庞家河 陕西 

分 类 号：P618.51[天文地球—矿床学]