北京市区尘土与表土的磁学性质及其环境意义

被引：30

作者：

郑妍

张世红

机构：

[1] 中国地质大学(北京)地质过程与矿产资源国家重点实验室

来源：

科学通报 | 2007年 / 20期

关键词：

尘土; 表土; 沙尘暴; 环境磁学; 北京市;

D O I：

暂无

中图分类号：

P49 [应用气象学];

学科分类号：

0706 ; 070601 ;

摘要：

对北京市区主要交通干道收集的尘土和表土样品进行详细的环境磁学测量,包括磁化率、非磁滞剩磁、等温剩磁以及典型样品的磁化率随温度变化特征和磁滞参数等.结果表明,尘土和表土样品颗粒磁学特征存在明显差异,主要表现在:尘土样品中磁性矿物的含量和高矫顽力组分均高于同一采点的表土样品;磁性颗粒粒度较表土样的偏粗.尘土和表土样品中剩磁载体均为亚铁磁性矿物,部分尘土样品中含有少量单质铁.尘土样品反映了城市工业和交通产生的磁颗粒特征,表土样品反映了自然和人为两个来源的磁颗粒特征.磁参数空间分布特征受采点周围工业区、车流量及道路状况等多种环境因素的影响,其中HIRM的分布可能指示了道路交通来源的磁颗粒特征.2006年4月采集的北京市区沙尘暴样品的磁性特征与自然来源的黄土、古土壤和尘土样品存在差异,可能是运移过程中混入了途经地区和/或北京市区近地表人为来源的颗粒物.

引用

页码：2399 / 2406

页数：8

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