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金属矿山 ›› 2014, Vol. 43 ›› Issue (08): 95-98.

• 地质与测量 • 上一篇    下一篇

粤北麻布岗矿田S、Pb同位素地球化学特征

孙宁1,2,罗卫2,孔凡乾1,韦龙明1,魏红军3   

  1. 1.桂林理工大学地球科学学院,广西 桂林 541006;2.有色金属矿产地质调查中心南方地质调查所,湖南 长沙 410001;3.长沙中色矿产勘查有限公司,湖南 长沙 410001
  • 出版日期:2014-08-15 发布日期:2015-03-31
  • 基金资助:

    * 中国地质调查局战略性矿产资源调查项目(编号:1212010781091)。

Geochemical Characteristics of Sulfur and Lead Isotopes of the Polymetallic Deposit in Mabugang

Sun Ning1,2,Luo Wei2,Kong Fanqian1,Wei Longming1,Wei Hongjun3   

  1. 1.College of Earth Science,Guilin University Of Technology,Guilin 541006 China;2.South Geology Investigation Institute of China non-ferrous Metals Resource Geological Survey,Changsha 410001 China;3.China Non-ferrous Metals Resource Exploration Co.,Ltd.,Changsha 410001,China
  • Online:2014-08-15 Published:2015-03-31

摘要: 根据麻布岗矿田多金属矿床中6件矿石样品的S、Pb同位素分析测试结果,选择利用Geokit软件计算得出S、Pb同位素的各种参数及图解,探讨矿田的成矿物质来源。结果表明:矿石硫化物δ34S值为-4.6‰~3.2‰,反映出岩浆硫组成特点;矿石Pb同位素δ206Pb/δ204Pb值为18.6~18.8,δ207Pb/δ204Pb值为15.7~15.8,δ208Pb/δ204Pb值为39.07~39.25,显示具有正常铅特征,与参与造山带的上地壳铅同位素组成特征相似。通过综合分析认为:麻布岗矿田多金属矿床成矿物质来源主要来自上地壳,形成的构造背景为克拉通化环境,与矿田处在活动大陆边缘的实际构造环境基本一致。

关键词: S同位素, Pb同位素, 多金属矿床

Abstract: According to the S,Pb isotope survey results of the six pieces of ore samples from the polymetallic deposit in Mabugang,the parameters and graphic of S,Pb isotopes were calculated by Geokit software,to discuss the source of ore-forming materials.Results showed that: the δ34S of sulfide mainly varies from -4.6‰ to +3.2‰,which reflects the composition characteristics of magmatic sulfur.δ206Pb/δ204Pb of Pb isotope among minerals is from 18.6 to 18.8,δ207Pb/δ204Pb is from 15.7 to 5.8,and δ208Pb/δ204Pb is from 39.07 to 39.25.All these display a normal lead character,which are similar to the lead isotopic composition at the upper crust of orogenic belt.In summary,the analysis indicated that the metallogenic sources of Mabugang polymetallic deposit mainly come from the upper crust.Its tectonic background is under cratonization action,and is basically consistent with the actual tectonic environment of mine field at active continental margin.

Key words: Sulfur isotope, Lead isotope, Polymetallic deposit