新疆塔城黄土古土壤磁化率特征及其影响因素  

Magnetic Susceptibility and Its Influencing Factors from Loess Paleosol in Tacheng,Xinjiang,China

作　　者：邓少福[1] 杨太保[1] 秦宏毅[1] 曾彪[1] 朱锡芬[1] 鄂崇毅[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

出　　处：《中国沙漠》2011年第4期848-854,共7页Journal of Desert Research

基　　金：国家自然科学基金项目(40871057);创新群体项目(40721061)共同资助

摘　　要：对新疆塔城奴拉厚13m的黄土-古土壤剖面磁化率、粒度、TOC、CaCO3进行了实验分析。结果表明,奴拉剖面粒度组成以粉砂(63～4μm)为主,由于该区黄土磁化率受控于原生磁铁矿、磁赤铁矿和赤铁矿等较粗颗粒磁性矿物,而黏粒物质吸附的铁磁性矿物及成土过程中生成的超顺磁颗粒和磁性矿物较少,磁化率与细颗粒物质成负相关,与粗颗粒物质成正相关关系;受生物成磁、化学作用以及TOC自身磁性的影响,磁化率与TOC表现出很强的正相关性;对磁化率与CaCO3含量的相关性分析发现,两者关系密切,CaCO3含量对该区磁化率的独特变化有重要影响。By using a 13-m loess-paleosol section from the Nula Village,Tacheng in northern Xinjiang,China,we made a series of experiments about magnetic susceptibility,grain size,TOC,CaCO3 of sediments in the section in laboratory.The results show that the grain size distribution is dominated by silty sand（63~4 μm）;the magnetic susceptibility is influenced by coarse particle minerals such as the native magnetite mineral,maghemite mineral and hematite mineral and so on,and little magnetic material absorbed by clay sediments and super-paramagnetic minerals generated in soil formation process have been found,so magnetic susceptibility is negatively correlated with fine particles and positively correlated with coarse particles.There is a strong positive correlation between magnetic susceptibility and TOC because of the magnetic effect of biological,chemical cause and effects of self-magnetic in TOC.There is a close relationship between CaCO3 and magnetic susceptibility,and CaCO3 makes great contribution to the magnetic susceptibility in this area.

关 键 词：黄土-古土壤 磁化率 新疆塔城 

分 类 号：P539.3[天文地球—古生物学与地层学]