南京大学学报(自然科学版) ›› 2014, Vol. 50 ›› Issue (2): 181–.

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南京大平山铜矿砷的赋存状态

王少华,徐兆文,陆现彩,王汝成,王浩,陈,朱翔   

  • 出版日期:2014-04-07 发布日期:2014-04-07
  • 作者简介:( 内生金属矿床成矿机制研究国家重点实验室,南京大学地球科学与工程学院,南京210093;2. 江苏省地质调查研究院,南京,210018)
  • 基金资助:
    江苏省国土资源厅资源补偿项目大平山铜矿砷赋存状态研究”,国家自然科学基金(40973030)项目

Mode of occurrence of arsenic and S, Pb Isotope in the dapingshan copper deposit , Nanjing

Wang Shaohua1,2,Xu Zhaowen1,Lu Xiancai1, Wang Rucheng1,Wang Hao1, Chen Meng1, Zhu Xiangyu1   

  • Online:2014-04-07 Published:2014-04-07
  • About author:1. National Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China;
    2.Geological Survey of Jiangsu Provinc, Nanjing,210018,China

摘要: 本文通过显微观察电子探针分析,发现大平山铜矿矿石中砷元素主要以硫化物方式,呈毒砂和少量砷黝铜矿独立矿物赋存于矿石中。毒砂主要呈自形-半自形粒状、他形粒状,赋存方式主要有:(1)以独立矿物呈稀疏浸染状分布于矿石中,局部呈条带状和中等稠密浸染状分布于矿石中;(2)呈交代方式与黄铁矿和黄铜矿生于矿石中,毒砂形成一般晚于黄铁矿和黄铜矿;(3)有少数毒砂被晚期黄铜矿、黄铁矿晶体包裹。砷黝铜矿呈他形粒状与黄铁矿、黄铜矿和毒砂生,往往交代黄铁矿和黄铜矿。硫同位素分析结果砷主要来自晚期岩浆热液,可能来自晚期火山热液;铅同位素分析结果表明砷可能主要来自上地壳。

Abstract: The detection of Arsenic, under the microscope, appeared chiefly in the form of sulphide from Dapingshan Copper Deposit using electron microprobe analysis, with the appearance of arsenopyrite and a small amount of tennatite independently distributed in the ore. Arsenopyrites are mainly found in the form of automorphic-hypidiomorphic granular texture and xenomorphic granular texture. Its mode of occurrence are as follows: firstly, it acts as an independent sparsity disseminated mineral with partial strip and medium dense dissemination distributed in ore; secondly, it replaces the paragenic chalcopyrite and pyrite in ore after their formation; finally, small amounts of arsenopyrites are often wrapped with late crystal form of chalcopyrite and pyrite. The content of tennantite in ore is modest, and the paragenesis of xenomorphic granular texture with chalcopyrite, pyrite and arsenopyrite often leads to the replacement of chalcopyrite and pyrite. The current Sulfur isotope analysis revealed the derivation of arsenic from the late-magmatic hydrothermal or the late-volcanic hydrothermal fluids, whereas the Lead isotope analysis indicated the derivation of arsenic from the upper earth crust.

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