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  • ISSN 1005-2518 
  • 创刊于1988年
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矿产勘查与资源评价

柴胡栏子金矿黄铁矿的化学成分标型特征及其矿床学意义

  • 陈振 ,
  • 王翠芝 ,
  • 吕古贤 ,
  • 张宝林 ,
  • 张启鹏 ,
  • 魏竣滨 ,
  • 史晓鸣
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  • 1.福州大学紫金矿业学院,福建 福州 350108
    2.中国地质科学院地质力学研究所,北京 100081
    3.中国科学院矿产资源研究重点实验室,中国科学院地质与地球物理研究所,北京 100029
    4.内蒙古矿业开发有限责任公司,内蒙古 呼和浩特 010020
陈振(1995-),男,江苏徐州人,硕士研究生,从事矿床成矿规律与成矿预测工作。sx290673378@163.com

收稿日期: 2021-05-21

  修回日期: 2021-11-09

  网络出版日期: 2022-06-17

基金资助

内蒙古自治区地质勘查基金管理中心科研项目“内蒙古自治区赤峰市柴胡栏子地区典型矿田构造岩相测量与成矿规律研究”(编号:[2019]科研-02)和校企合作项目“绢云母红外光谱特征的制约因素研究”(BM-2019-08)

Typomorphic Characteristics of Chemical Composition of Pyrite in Chaihu-lanzi Gold Deposit and Its Mineralogy Significance

  • Zhen CHEN ,
  • Cuizhi WANG ,
  • Guxian LV ,
  • Baolin ZHANG ,
  • Qipeng ZHANG ,
  • Junbin WEI ,
  • Xiaoming SHI
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  • 1.Zijin Mining College, Fuzhou University, Fuzhou 350108, Fujian, China
    2.Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
    3.Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    4.Inner Mongolia Mining Development Co. , Ltd. , Hohhot 010020, Inner Mongolia, China

Received date: 2021-05-21

  Revised date: 2021-11-09

  Online published: 2022-06-17

摘要

柴胡栏子金矿目前保有储量已不能满足金矿持续生产的需要,应开展进一步深边部找矿工作。基于成因矿物学理论,采用矿物地球化学方法对矿区内黄铁矿化学成分标型特征进行了研究。结果表明:(1)黄铁矿中Co/Ni元素比值和As-Co-Ni元素三角图解显示,柴胡栏子金矿黄铁矿成因较复杂,受建平群、区域变质和岩浆热液活动等诸多因素的制约;(2)黄铁矿中Au/Ag和S/Se等特征值显示出岩浆热液特征,表明成矿流体的形成主要与矿区岩浆活动有关;(3)黄铁矿晶体中的金以纳米微粒金存在,因纳米金具有较强的迁移性以及被碳质吸附的特性,因此矿区含碳质较高的绢云母化含石墨斜长片麻岩是最有利的赋矿围岩。依据矿区黄铁矿成分特征,结合区域地质、矿区地质及蚀变带特征,得出柴胡栏子金矿形成受诸多因素的联合控制,矿区基性岩脉侵入活动是重要的因素,基性岩脉不仅带来部分矿源,而且其携带的岩浆热液使建平群中的金(这部分金已在区域变质过程中得到活化)进一步活化而进入成矿流体中,在NNE向挤压构造带和NWW向张性裂隙构造带的交会部位,成矿流体与围岩广泛交代形成以蚀变岩型为主的金矿床,矿区东南部深部建平群老变质岩地层具有较好的找矿前景,尤其是绢云母化含石墨斜长片麻岩中的构造发育部位。

本文引用格式

陈振 , 王翠芝 , 吕古贤 , 张宝林 , 张启鹏 , 魏竣滨 , 史晓鸣 . 柴胡栏子金矿黄铁矿的化学成分标型特征及其矿床学意义[J]. 黄金科学技术, 2022 , 30(2) : 165 -178 . DOI: 10.11872/j.issn.1005-2518.2022.02.061

Abstract

The current reserves of the Chaihulanzi gold deposit can not meet the needs of continuous production of the gold mine,and further deep-edge prospecting should be carried out. Based on the theory of genetic mineralogy,the typomorphic characteristics of pyrite chemical composition in the the mining area were studied by mineral geochemistry method.The results are as follows:(1)The ratio of Co/Ni and the As-Co-Ni triangle diagram of pyrite show that the genesis of pyrite in Chaihulanzi gold deposit is complex,which is restricted by the strata of Jianping Group,regional metamorphism and magmatic hydrothermal activity;(2)The ratio of Au/Ag,S/Se and other characteristic values of pyrite show the characteristics of magmatic hydrothermal solution and the formation of ore-forming fluid is mainly related to the magmatic activity in this area;(3)Pyrite is rich in As,which indicates that gold in pyrite crystal exists as nano-particle gold,which indicates that ore-forming fluid has strong migration and the nano-particle gold has strong adsorption in rocks rich in carbon and clay.According to the composition characteristics of pyrite,combined with regional geology,mining area geology and the characteristics of the alteration zone,it is concluded that the Chaihulanzi gold deposit is mainly related to the intrusion of basic dikes. The basic vein not only brings some ore sources,but also the magmatic hydrothermal fluid brings gold in Jianping Group to further activate and enter into the ore-forming fluid. At the joint of NNE trending compression structural belt and NWW tensile fracture structural zone,the ore-forming fluid and surrounding rock are widely metasomated to form a gold deposit with altered rock type as the main part.There are good prospecting prospects in the deep metamorphic strata of Jianping Group in the southeast of the mining area,especially in the structural development part of the sericite graphite-bearing plagioclase gneisses.

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