摘要
位于中国西风区新疆伊犁盆地黄土与古土壤样品的常量元素分析表明 ,其烧失量和SiO2 含量与样品的碳酸盐含量正相关。黄土与古土壤SiO2 含量没有明显差别 ,但Al、、Fe、Mn和K在古土壤中发生一定的分异 ,代表了相对强的成壤作用。与黄土高原相比 ,伊犁盆地末次间冰期古土壤富钛、铁、锰、镁和钙 (个别样品除外 ) ,而黄土高原S1更加贫钠和钾 ,而且钙含量很低 ;末次冰期黄土富锰、镁和钙 ,贫钠和钾 ,而黄土高原L1以富钙贫钠、钾为特征。常量元素地球化学行为揭示 ,伊犁黄土与古土壤较黄土高原同期黄土与古土壤形成于更加干旱的气候环境中。
Yili basin is located at the northwest of China where the climate is influenced by westerlies year in year out and loess is widespread. According to the dating of TL, most of the loess accumulated during the last glaciation.48 samples of loess and paleosols collected from Yili area of China were analyzed. The major element composition were measured by a VA-320A X-ray fluorescence spectrometer. Analytical uncertainties are less than ±2% for all major element and the loss ignition was obtained by weighting after one hour of caldination at 950℃.The result shows that the loss ignition of loess and paleosol are positively related to the concentration of CaCO3 and the percentage of SiO 2 as well as. The relative coefficient(R 2) are 0.9548 and 0.7029 respectively. The paleosol can be distinguished by a relatively high content of Al, Fe, Mn and K from the loess, even though the percentages of SiO 2 are not different significantly. This implies that the pedogenisis was stronger during the paleosol developing and the soil was formed under an oxidation and alkaline condition.The paleosol developed during last glaciation in Yili basin is rich in Ti, Fe, Mn, Mg and Ca, while S1 at the Loess Plateau is poor at Ca, Na and K contrasting to that of the Loess Plateau, the Yili loess(L1) is characterized by a high content of Ca, Mg and Mn All of these suggest that the Yili loess and paleosol developed under more arid climate.
出处
《干旱区地理》
CSCD
北大核心
2003年第1期23-29,共7页
Arid Land Geography
基金
国家重点基础研究发展规划项目 (批准号 :G19990 435 0 2 )
国家自然科学基金项目 (批准号 :496 710 0 9)
日本理化学所国际合作项目资助
