东南极拉斯曼丘陵斯托尼斯半岛化学风化作用的初步研究

THE CHEMICAL WEATHERING AT STORNES PENINSULA, LARSEMANN HILLS,EAST ANTARCTICA

在低温环境下，拉斯曼丘陵斯托尼斯半岛表生环境具有微弱的化学风化作用。富集系数、富集分异系数等指标的分析表明，化学元素存在不同程度的富集、迁移。其中Ｃａ的迁移能力最强，Ｍｇ、Ｓｒ、Ｚｎ、Ｋ、Ｎａ等元素也均有较强的迁移能力，在不同粒级中各元素表现出不同的集散特征。风化壳硅铝率平均为５．７９，属弱风化类型，相对于母岩，风化壳中ＳｉＯ２、Ａｌ２Ｏ３均有一定淋失。化学风化作用具有由南向北增强趋势；剖面中具有中下层风化程度略高于表层的趋势。

This paper states that under lowtemperature, there exists the weak chemical weathering processes on the landsurface environment at Stornes Peninsula, Larsemann Hills,which has led to the enrichment and migration of chemical elements in variant degrees. The element of Ca has the strongest migrational ability, and Mg, Sr, Zn, K, Na, etc. have relatively strong migrational abilities. Elements have the variant characteristics of enrichment and eluviation in different particle size. The average ratio of SiO2/Al2O3 is 5.79 which shows a weak chemical weathering property of the soil. Comparing with the parent rock, the element of SiO2 and Al2O3 have been eluviated. In addition, there is the trend of increasingly strong weathering from south to north. Finally, the strength of the weathering crusts in middle and deep sections is slightly higher than that of surface section.