| 西藏尕尔勤矿床区域性土壤重金属元素地球化学特征及来源解析 |
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| 关键词:soil heavy metals Ga’erqin mining area source analysis multivariate statistics pollution index method |
| 基金项目:中国地质调查局二级项目“西藏多龙矿床技术经济与环境综合评价”(编号: DD20160330);中国地质科学院院基本科研业务费“绿色矿山建设技术装备目录及绿色勘查要求研究”(编号: YK1710-0) |
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| 摘要点击次数: 1945 |
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| 摘要: |
| Sources Analysis and Element Geochemical Characteristics of Regional Soil Heavy Metals from the Ga’erqin Ore Deposit, Tibet |
| The study of geochemical background and source of soil heavy metals before ore mining has important guiding significance for environmental protection work in subsequent mining. The Ga’erqin mining area is located in the southeast of the Dulong ore concentration area, belonging to Wuma Township of Gaize County, Tibet. The previous research achievements mainly focused on metallogenic theory, geochemistry, and ore-forming fluid in the Duolong ore concentration area, but the achievements on environment were very insufficient. In this paper, taking the Ga’erqin mining area as an example, the authors systematically collected 835 soil samples in the study area, and measured the content and pH values of 7 heavy metals (Cu, Pb, Zn, Cd, Cr, Hg, and As) in soil samples. The environmental status of the Ga’erqin mining area was evaluated by single factor pollution index method and Nemerow pollution index method. What’s more, in combination with GIS technique and multivariate statistics, the elemental geochemical characteristics and sources of heavy metals in the soil of the mining area were studied. The results show that the soil in the study area is alkaline-strongly alkaline, and the maximum values of Cu, Pb, and Hg are respectively lower than grade III standard of soil environmental quality (GB15618—1995), with only the average value of Cr exceeding grade III standard, that heavy metal cumulative pollution in soil of A mining area has the characteristics of Cr>As>Cd>Zn>Cu>Pb>Hg, and the average value of Nemerow comprehensive pollution index is 1.96, indicating a certain degree of accumulation, and that, except for Hg's non-spatial variation, the other six elements all have certain degree of spatial differentiation. Taking correlation analysis, cluster analysis and principal component analysis results together, the authors classified soil heavy metal sources into four groups with similar geochemical processes: (1) Pb, Zn, As, and Cd originate mainly from chemical reaction process of pyrite; (2) stacked sand gold tailings are the main source of Cu; (3) Cr has dual sources of atmospheric deposition and parent rock; (4) Hg originates from natural weathering of rocks. |
| LIU Qing-ping,DENG Shi-qiang,ZHAO Yuan-yi,LI Xiao-sai.2018.Sources Analysis and Element Geochemical Characteristics of Regional Soil Heavy Metals from the Ga’erqin Ore Deposit, Tibet[J].Acta Geoscientica Sinica,39(4):481-490. |
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