坎苏剖面记录的西天山地区黄土磁学性质及其控制因素初探  

Magnetic property and its dominant fact of loess strata in western Tianshan area recorded by Kansu section

作　　者：贾佳[1] 刘现彬[1] 夏敦胜[1,2] 魏海涛[1] 王博[1] 

机构地区：[1]兰州大学资源环境学院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》2011年第1期124-132,共9页Arid Land Geography

基　　金：973项目(2009CB421308);国家自然科学基金项目(批准号:40871080和90502008)资助

摘　　要：西天山地区坎苏(KS)黄土剖面的岩石磁学研究结果表明,与黄土高原地区黄土基本一致,磁性矿物以亚铁磁性矿物为主,磁铁矿和磁赤铁矿占据重要地位,针铁矿也普遍存在于地层中。该剖面中磁性矿物的含量高,硬磁性矿物含量也高。磁性矿物磁晶粒度以假单畴和多畴(PSD/MD)为主,而S1S3的磁晶粒度较细,表现为粗单畴(SSD)的性质。进一步分析地层磁学性质的控制因素发现,古土壤层与黄土层中磁性矿物密度的差别很小,磁学性质差别主要在于细粒磁性矿物和软磁性矿物的相对含量,二者与成壤强度具有较好的正相关关系,表明成壤作用对地层的磁学性质具有重要影响。For depositing and accumulating thick loess and paleosol sequences and distributing widely in the continents,the loess sediment is treated as one of the best paleoclimatic indicators.The magnetic susceptibility(χlf) of loess and paleosol sequences in China has been recognized and widely used as a proxy paleoclimatic indicator since Heller and Liu recognized its variation in loess and soil.It shows that the higher χlf values occurred in soil layers and the lower χlf values occurred in loess layers,what is mo...

关 键 词：黄土地层 磁学性质 成壤作用 天山黄土 

分 类 号：P642.114[天文地球—工程地质学]