中国西北地区晚第四纪黄土中镁铝地球化学与古气候意义  

The Geochemistry and Paleoclimate Significance of Magnesium and Aluminium in Loess of Late Quaternary in Northwestern China

作　　者：余素华[1] 文启忠[1] 张士三[1] 陈承惠[1] 

机构地区：[1]中国科学院地球化学研究所,国家海洋局第三海洋研究所

出　　处：《沉积学报》1994年第1期112-116,共5页Acta Sedimentologica Sinica

摘　　要：研究我国干旱半干旱区第四纪黄土剖面中镁铝含量比（ｍ值）的变化特征及所反映的古气候古环境意义。表明黄土－古土壤的ｍ值大小变化反映出黄土堆积－古土壤发育时期的气候干湿变化。Presented in this paper arc the changing characteristics and its paleoclimatic and environmental significance of magnessium and aluminium content ration (m value) of loessic sections of Quaternary in arid and relatively arid restons of China. The changes of the m values in loess-paleosol show the changes of the paleoclimatic aridity and wet during loess deposition and paleosol development. During loess deposition, the m valures are higher. the variation curves of the m values appear the peaks showing the arid climate and environment. During paleosol development. the m values are lower, the variation curves of the m valures appear valley showing the relative wet climate and environment.The result of study of magnestum and aluminium content rations of loess sections in arid and relatively aric rgeions of China shows alternatives of four times of arid and wet climate since late pleistocene at least.

关 键 词：古气候 黄土 镁 铝 含量 地球化学 

分 类 号：P532[天文地球—古生物学与地层学]