大同盆地高砷地下水系统沉积物环境磁学特征

谢先军; 王焰新; 苏春利; 刘怀庆; 段萌语; 张宏达

大同盆地高砷地下水系统沉积物环境磁学特征

中国地质大学环境学院及教育部生物地质与环境地质重点实验室，湖北武汉 430074

基金项目:

国家杰出青年科学基金项目 40425001

教育部重点科研项目 105033

详细信息

作者简介:
谢先军(1979-), 男, 博士, 主要从事地下水污染与控制方向研究. E-mail: cug_xxj@163.com

中图分类号: X143;P33
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出版历程
- 收稿日期: 2007-03-26
- 刊出日期: 2008-02-25

Environmental Magnetic Properties of Sediments of High Arsenic Groundwater System, Datong Basin

Shool of Erviroumental Studies & MOE Lalorutory of Biogeology and Eruironmental Geology, China Urirersity of Geasciences, Wuhan 430074, China

摘要

摘要: 为了研究高砷含水层沉积物中砷与磁性矿物的关系, 对大同盆地高砷地区含水层钻孔样品进行了环境磁学和地球化学分析, 结果表明亚铁磁性矿物是决定含水层沉积物磁性特征的主要磁性矿物.通过对比砷和磁性参数在垂向上的变化趋势发现, 高砷含量往往对应着低的饱和等温剩磁(SIRM) 值, 揭示出砷和顺磁性矿物之间也存在联系.沉积物砷含量与磁性参数的相关系数均小于0.5 (α=0.05), 表明砷和亚铁磁性矿物及不完整反铁磁性矿物之间不存在明显的联系.在所有磁性参数中磁化率(χ)和砷含量之间相关性最显著, 相关系数均在0.4 (α=0.05) 左右, 低的相关系数与亚铁磁性矿物和不完整反铁磁性矿物对顺铁磁性矿物的稀释有关.该地区高砷地下水的形成可能与水铁矿及纤铁矿等砷的赋存矿物在还原条件下的还原溶解有关.
- 大同盆地 /
- 砷 /
- 地下水系统 /
- 沉积物 /
- 环境磁学
Abstract: The purpose of the study is to test the possible relationship between magnetic parameters and arsenic in high arsenic aquifer sediment. Magnetic and geochemical study on core sediments from Datong basin suggests that the dominant magnetic mineral is ferrimagnetic. Magnetic measurements and arsenic concentration analysis were carried out to understand the distribution characteristics of magnetic parameters and arsenic in sediments. All core samples with high arsenic content have low saturation isothermal remnant magnetism (SIRM) values, indicating the correlation between arsenic and paramagnetic mineral. The correlation factors between arsenic content and magnetic parameters are very low (R² < 0.5, α=0.05), but the magnetic susceptibility (χ) is better correlated than the other magnetic parameters with correlation factor of about 0.4 (α=0.05). The low correlation between magnetic proxies and arsenic content is attributed to the dilution of paramagnetic minerals by the ferrimagnetic and anti-ferromagnetic minerals. The occurrence of As-rich groundwater in this region may be due to dissolution of As-bearing Fe mineral (e.g. γFeOOH, 5Fe2O3·9H2O) and subsequent arsenic release.
- Datong basin /
- arsenic /
- groundwater system /
- sediment /
- environmental magnetism.

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图 1 采样点位置图

Fig. 1. Sample sites

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图 2 沉积物钻孔样品磁学参数及砷含量的垂向变化

Fig. 2. Vertical variations of magnetic parameters and arsenic concentration for core sediments

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图 3 典型样品等温剩磁随磁场变化曲线

Fig. 3. IRM versus magnetic field curves of typical core sediments

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表 1 大同盆地不同采样点沉积物的环境磁学参数与砷含量统计

Table 1. Statistic of environmental magnetic parameters and arsenic concentrations of core samples from Datong basin

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