龙门山造山带北段黄泥坪金矿床的矿床地质和元素地球化学特征  

Geological and geochemical features of Huangniping Au deposit in northern Longmenshan orogenic belt and its significance for exploration

作　　者：江宏君 陈华勇[1,2,4] 王朋 高政伟 纪冬平 吴宝鹏 程博兴 焦宏剑 王义忠 JIANG Hongjun;CHEN Huayong;WANG Peng;GAO Zhengwei;JI Dongping;WU Baopeng;CHENG Boxing;JIAO Hongjian;WANG Yizhong(CAS Key Laboratory of Mineralogy and Metallogeny,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China;University of Chinese Academy of Sciences,Beijing 100049,China;Geological Party No.214,Sino Shaanxi Nuclear Industry Group,Xi’an 710100,Shaanxi,China;Guangdong Provincial Key Laboratory of Mineral Physics and Materials,Guangzhou 510640,Guangdong,China)

机构地区：[1]中国科学院广州地球化学研究所矿物学与成矿学重点实验室,广东广州510640 [2]中国科学院大学,北京100049 [3]中陕核工业集团二一四大队有限公司,陕西西安710100 [4]广东省矿物物理与材料研究开发重点实验室,广东广州510640

出　　处：《地球化学》2023年第6期721-733,I0001-I0029,共42页Geochimica

基　　金：中陕核工业集团公司院士工作站研究课题(YS190101)资助。

摘　　要：黄泥坪金矿床位于龙门山造山带北段,是近年来新发现的一个中型金矿床,包括汉树沟、山关石、柳树坪和石罐子4个矿段,以蚀变岩型矿化为主,兼具石英脉型矿化。为进一步扩展深部找矿空间,评价深部找矿潜力,本文针对汉树沟和山关石蚀变岩型矿化开展了矿床地球化学研究。结果表明,汉树沟矿段的主要伴生元素为As、Ba,山关石矿段的主要伴生元素为As、Sb、Ag、Hg、Pb、Ba,其中As与Au的关系最为密切,可以作为指示Au矿化异常信息的最佳元素,且As含量>3785×10^(-6)、Au含量>0.075×10^(-6)、Hg含量>0.13×10^(-6)、Sb含量>11×10^(-6)可作为矿化蚀变带的判别标志。黄泥坪金矿床各元素在垂向上发生了不同程度的迁移富集,矿体前端元素组合为Hg、Sb、Ag、Pb,近矿元素组合为Au、As,矿体尾部元素组合为Ba、Cu、Co、Mn、Bi、Ni、Zn。汉树沟矿段北西方向钻孔深部出现矿体上盘角砾白云岩以及矿体前端和尾部Hg/Co、(Hg+Sb)/(Co+Ba)、(Hg+Ag+Pb)/(Co+Ni+Mn)值的显著增大,指示其深部具有较大成矿潜力。The Huangniping Au deposit,located in the northern Longmenshan orogenic belt,is a newly discovered medium-sized deposit that includes the Hanshugou,Shanguanshi,Liushuping,and Shiguanzi ore sections.The orebodies in the two former sections are mainly hosted in altered rocks,whereas the latter two are mainly in quartz veins.Primary halo geochemistry was used to evaluate the metallogenic potential of the Hanshugou and Shanguanshi ore sections.The primary halo study revealed that the accessory elements of Hanshugou are As and Ba,whereas those of Shanguanshi are As,Sb,Ag,Hg,Pb,and Ba.As has a close relationship with Au and is the best indicator element for Au.The mineralized alteration zone has high concentrations of As,Au,Hg,and Sb,generally higher than 3785×10^(-6),0.075×10^(-6),0.13×10^(-6),and 11×10^(-6),respectively.The elements of the Huangniping Au deposit migrated and were enriched to some degree in the vertical direction.The supra-ore halo elements were Hg,Sb,Ag,and Pb;the near-ore halo elements were Au and As;and the sub-ore elements were Ba,Cu,Co,Mn,Bi,Ni,and Zn.The appearance of upper wall breccia dolomite and the significant increase in geochemical parameters(Hg/Co,(Hg+Sb)/(Co+Ba),and(Hg+Ag+Pb)/(Co+Ni+Mn))indicate that there is excellent prospecting potential in the depths of the northwest Hanshugou ore section.

关 键 词：地球化学特征 矿床地质 深部成矿预测 黄泥坪金矿床 龙门山造山带 

分 类 号：P618[天文地球—矿床学] P595[天文地球—地质学]