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黑龙江永新金矿床金-银系列矿物与载金硫化物特征及成因分析
Characteristics of the gold-silver minerals and auriferous sulfides in the Yongxin gold deposit of Heilongjiang Province and their genetic significance
投稿时间:2017-06-22  修订日期:2017-09-30
中文关键词:永新金矿床  金-银系列矿物  金成色  载金硫化物  矿床成因
英文关键词:Yongxin gold deposit  gold-silver minerals  gold fineness  auriferous sulfide  ore genesis
基金项目:黑龙江省国土资源科研项目(201603);国家重点研发计划"深地资源勘查开采"重点专项课题(2016YFC0600106)
作者单位E-mail
李士胜 地质过程与矿产资源国家重点实验室, 中国地质大学 地球科学与资源学院, 北京 100083  
李胜荣 地质过程与矿产资源国家重点实验室, 中国地质大学 地球科学与资源学院, 北京 100083 lisr@cugb.edu.cn 
李成禄 地质过程与矿产资源国家重点实验室, 中国地质大学 地球科学与资源学院, 北京 100083
黑龙江省地质调查研究总院, 黑龙江 哈尔滨 150036 
 
于援帮 黑龙江省地质矿产局, 黑龙江 哈尔滨 150036  
曾勇杰 地质过程与矿产资源国家重点实验室, 中国地质大学 地球科学与资源学院, 北京 100083  
袁茂文 地质过程与矿产资源国家重点实验室, 中国地质大学 地球科学与资源学院, 北京 100083  
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中文摘要:
      永新金矿位于嫩江-黑河构造混杂岩带的南段,为近几年新发现的受构造带控制的蚀变岩型金矿床。通过光学显微镜、电子探针及背散射观测对永新金矿床的金-银系列矿物与载金硫化物进行了系统研究,发现金-银系列矿物以自然金为主,银金矿次之,粒径多集中在5~20 μm,以包体金、裂隙金为主,粒间金较少,成色为843~917,平均888;载金硫化物有黄铁矿和方铅矿,以黄铁矿为主;早阶段黄铁矿粒径较大,以立方体为主,较破碎;主成矿阶段黄铁矿粒径较小,以立方体和五角十二面体为主。黄铁矿Co-Ni-As三角图显示成矿与岩浆热液关系密切,金矿物成色与黄铁矿的Fe/(S+As)值指示矿床形成于中深成中温环境。与克拉通破坏型(胶东型)和造山型金矿床比较,永新金矿床与两者既有相近之处,又有明显区别。
英文摘要:
      The Yongxin gold deposit located in the southern part of the Nenjiang-Heihe tectonic mélange zone is a newly discovered altered rock type gold deposit controlled by tectonic belt. The gold-silver minerals and auriferous sulfides in this deposit were systematically studied by optical microscope, electron microprobe analysis and back scattered electron images, and the results show that gold-silver minerals are mainly native gold, subordinate electrum, and minor amounts of intergranular gold, with the crystal size in the range of 5 to 20 μm and mainly occurring as inclusions and fissure fillings. The fineness varies from 843 to 917, 888 on average. Gold-silver minerals were found in pyrite and galena, mainly pyrite. At the early stage of mineralization, the crystalline form of coarse-grained yrite was mainly cubic and crushed by late stress. At the main ore-forming stage, the crystalline form of fine-grained pyrite was dominated by cubic and pentagonal dodecahedron. The Co-Ni-As phase diagram shows that mineralization was closely related to magmatic fluids, the Fe/(S+As) ratio of the pyrite and the fineness indicate that this deposit was formed at the medium temperature and medium to deep mineralization environment. The Yongxin gold deposit is partially similar to and yet obviously different from decratonic (Jiaodong type) and orogenic gold deposits.
李士胜,李胜荣,李成禄,于援帮,曾勇杰,袁茂文,2018,黑龙江永新金矿床金-银系列矿物与载金硫化物特征及成因分析[J].岩石矿物学杂志,(1):115~127.
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