新疆表土磁学性质及其环境意义  

Magnetic characteristics of surface soil and its significance in Xinjiang,China

作　　者：魏海涛[1] 夏敦胜[1,2] 陈发虎[1] 金明[1] 王训明[2] 贾佳[1] 刘现彬[1] 

机构地区：[1]兰州大学西部环境教育部重点实验室,甘肃兰州730000 [2]中国科学院寒区旱区环境与工程研究所,沙漠与沙漠化重点实验室,甘肃兰州730000

出　　处：《干旱区地理》2009年第5期676-683,共8页Arid Land Geography

基　　金：国家自然科学基金项目(40871080,90502008)资助

摘　　要：在新疆地区采集了331块表土样品,分析了样品的磁性特征(磁性矿物种类、磁性矿物含量和粒径组成)及其环境意义。结果指示新疆地区表土磁性特征存在较大的区域差异。北疆样品中磁性矿物总体含量较高,以单畴和假单畴颗粒的磁铁矿、磁赤铁矿等软磁性矿物为主,南疆样品中磁性矿物含量较低,硬磁质含量稍高,单畴颗粒矿物所占比重较北疆低;伊犁地区样品的磁性矿物在组成上与南疆样品更为接近,但成壤相对较强,超顺磁颗粒含量高。新疆地区表土磁性特征差异在一定程度上反映了新疆地区环境因子的区域差异,尤其是年均降水的不同。In this study, a set of environmental magnetic parameters （ XH, Xfd%, XARM, SIRM, HIRM SOFT and SIRM/Xlf, XARM/SIRM ＇and XARM/X1f） of 331 surface soil samples in Xinjiang were systematically measured. The magnetic characteristics （magnetic mineralogy, magnetic grain- size and magnetic property） and its environmental significance were discussed. Results indicate that the main magnetic minerals in these surface soils are single do- main magnetite. The content of magnetic minerals in surface soils in north Xinjiang is higher than that in south Xin- jiang; however, the content of hard magnetic minerals is higher in surface soils in south Xinjiang. The parent rock samples in Yili region contain similar magnetic minerals as that in south Xinjiang, but with much higher magnetic SP content due to higher pedogenic process. The differences in magnetic characteristics among surface soils in dif- ferent regions of Xinjiang might reflect the differences in regional climate, especially the amount of precipitation.

关 键 词：环境磁学 表土 磁化率 新疆 

分 类 号：P642.114[天文地球—工程地质学]