文章摘要
尤诗祥,陈可,张毓策,李永顺,刘忠法.内蒙古黄岗梁铁多金属矿床磁铁矿地球化学特征及其地质意义[J].矿产勘查,2022,13(4):398-409
内蒙古黄岗梁铁多金属矿床磁铁矿地球化学特征及其地质意义
Geochemical characteristics and geological significance of magnetite in Huanggangliang iron polymetallic deposit, Inner Mongolia
投稿时间:2022-03-08  
DOI:10.20008/j.kckc.202204003
中文关键词: 磁铁矿  黄岗梁矿床  EPMA  LA-ICP-MS  矿床成因
英文关键词: magnetite  Huanggangliang deposit  EPMA  LA-ICP-MS  the formation of deposit
基金项目:本文受中南大学研究生科研创新项目(1053320211880)资助。
作者单位
尤诗祥 中南大学有色金属成矿预测与地质环境监测教育部重点实验室, 湖南 长沙 410083
中南大学地球科学与信息物理学院, 湖南 长沙 410083 
陈可 中南大学有色金属成矿预测与地质环境监测教育部重点实验室, 湖南 长沙 410083
中南大学地球科学与信息物理学院, 湖南 长沙 410083 
张毓策 中南大学有色金属成矿预测与地质环境监测教育部重点实验室, 湖南 长沙 410083
中南大学地球科学与信息物理学院, 湖南 长沙 410083 
李永顺 中南大学有色金属成矿预测与地质环境监测教育部重点实验室, 湖南 长沙 410083
中南大学地球科学与信息物理学院, 湖南 长沙 410083 
刘忠法 中南大学有色金属成矿预测与地质环境监测教育部重点实验室, 湖南 长沙 410083
中南大学地球科学与信息物理学院, 湖南 长沙 410083 
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中文摘要:
      黄岗梁大型—超大型铁多金属矿床位于大兴安岭主脊南端,其成因存在很大争议。矿区内主要有五个采区,其中Ⅰ-V-Ⅲ采区沿北东方向展布,各区矿物组合特征差异显著。本文通过系统的地质调查和岩相学观察,将该矿床内磁铁矿按采区分为3种类型,并按矿物组合和磁铁矿结构特征分成8种亚类。采用电子探针(EMPA)和激光剥蚀电感耦合等离子质谱(LA-ICP-MS)原位微区分析技术,对三个采区各类型磁铁矿的结构和主微量元素特征进行对比研究,探讨磁铁矿的形成环境和矿床成因。结果表明Ⅰ、V和Ⅲ各采区磁铁矿的氧逸度和温度均逐渐降低,Ⅲ区含硫化物磁铁矿显示最低的形成温度,V区与Ⅰ区具有相似的成矿温度和氧逸度。磁铁矿的TiO2-Al2O3-(MgO+MnO)、(Ca+Al+Mn)-(Ti+V)和Ni/(Al+Mn)-(Ti+V)图解表明三个采区磁铁矿均为矽卡岩型,Ti-Ni/Cr图解表明磁铁矿的热液型成因,结合矿床地质和岩相学特征认为黄岗梁锡铁多金属矿床为与岩浆热液活动相关的矽卡岩型矿床。
英文摘要:
      The large-oversized iron polymetallic deposit in Huanggangliang, that its genesis is highly controversia, is located in the southern part of the main ridge of Dahinganling. There are mainly five mining areas in the deposit, among which Ⅰ, V and Ⅲ mining areas are distributed along the NE, and the characteristics of mineral assemblages in each area are significantly different. Based on systematic geological investigation and petrographic observation, magnetite in the deposit is divided into three types according to the mining area, and eight types according to mineral assemblage and structure characteristics of magnetite. The structure and elements characteristics of magnetite in these mining areas were studied based on EMPA analyses of main elements and LA-ICP-MS analyses of trace elements to discussing the formation environment and genesis of magnetite deposit. The results show that the fo2 and temperature of the magnetite gradually decrease in the mining area Ⅰ, V and Ⅲ. The formation temperature of magnetite which contains sulfide in Ⅲ zone is the lowest, and have similar temperature and fo2 for the V zone and Ⅰ zone. TiO2-Al2O3-(MgO+MnO), (Ca+Al+Mn)-(Ti+V) and Ni/(Al+Mn)-(Ti+V) diagrams of magnetite in the three mining areas indicate that the magnetite is a skarn-type, and Ti-Ni/Cr diagram indicates that the magnetite is a hydrothermal-type. The Huanggangliang Fe polymetallic deposit is considered to be a skarn-type deposit related to magmatic hydrothermal activity.
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