石英尾砂对濠河上游沉积物污染的磁学响应  

Magnetic Responses to Sediments Polluted by Quartz Tail-Sands in Upper Reaches of Haohe River

作　　者：李勇[1] 李海燕[2] 刘慧[1] 

机构地区：[1]安徽科技学院理学院,安徽凤阳233100 [2]中国地质大学地质过程与矿产资源国家重点实验室,北京100083

出　　处：《吉林大学学报（地球科学版）》2011年第4期1204-1211,共8页Journal of Jilin University：Earth Science Edition

基　　金：安徽省优秀青年人才基金项目(2010SQRL097);安徽省自然科学一般项目(KJ2010B293);安徽科技学院重点建设课程项目(AKXK20102-2)

摘　　要：濠河上游沉积物和石英尾砂磁学参数及SiO2质量分数（w（SiO2））分析结果表明,沉积物中w（SiO2）高达80%以上,说明沉积物已被石英尾砂严重污染。磁测结果显示,沉积物与石英尾砂的磁学特征基本相同,这2类样品中的主要磁性矿物是磁铁矿,含量较低,磁性矿物粒径较宽,主要为0.1-5μm;这主要是大量石英尾砂进入濠河后,在其稀释作用下,沉积物磁性减弱,使磁性矿物的粒径变粗。沉积物中w（SiO2）与磁学参数（χ、SIRM和χARM）存在负相关关系（-0.83≤R≤-0.61）,表明磁学参数能反映石英尾砂对沉积物的污染程度,其值越低说明石英尾砂对濠河污染越严重。Mineral magnetic parameters and contents of SiO2（w（SiO2）） were measured on sediments of upper reaches of Haohe River and quartz tail-sands.Results show that w（SiO2） of the sediments is more than 80%.It proves that sediments of upper reaches of Haohe River has been seriously polluted by quartz tail-sands.Magnetic measurement results show that the magnetic characteristics for sediments and quartz tail-sands are basically the same.The main magnetic mineral of the two kinds of samples is ferrimagnetic magnetite,and the content of magnetic mineral is low.The magnetic grains of the two kinds of samples are wide,mainly in the 0.1-5 μm region.When a lot of the quartz tail-sands is rushed into Haohe River,its effect weakens the magnetism of sediments,while the magnetic grains become bigger.The w（SiO2） of sediments and the magnetic parameters（χ,SIRM and χARM） have negative correlation（-0.83≤R≤-0.61）.It shows that the magnetic parameters might reflect degree of sediment＇s pollution by quartz tail-sands.The lower the scale of the magnetic parameters,the more seriously sediment will be polluted by quartz tail-sands.

关 键 词：石英尾砂 濠河 沉积物 环境磁学 污染 

分 类 号：P318[天文地球—固体地球物理学] X123[天文地球—地球物理学]