英峰岭剖面红土的粘土矿物和化学特征与成土环境关系

Clay mineral, chemical characteristics and environmental record of the Multi stage laterite at Yingfengling Section, Leizhou Peninsula

地球化学与粘土矿物学研究表明，广东雷州半岛英峰岭多期红土是拉斑玄武岩红土化初级阶段的产物，由剖面底层至顶层，红土成熟度依次递增。各层红土中主要粘土矿物含量和粘土的Ｆｅ２Ｏ３ 含量，以及红土和粘土的氧化、淋溶、富铁铝等化学特征系数与红土埋深之间呈波动起伏的关系。这种关系源于母岩成土过程中的气候与火山效应的叠加，是成土环境波动的反映，据此初步推断英峰岭剖面红土火山岩系列最少记录有９ 次成土环境的波动变化。

The results of mineral and chemical analyses indicate that the multi stage laterite formed in the early lateritization stage of basalts of Yingfengling, Leizhou Peninsula of Guangdong Province. The laterite maturity gradually increases from the bottom to the top of the lateritic section. The clay mineral contents in the laterite, Fe2O3 contents in the clay and chemical indexes, such as oxidation, eluviation, ferrite and aluminum enrichment vary with the section depth. That is resulted from pedogenic environmental variations caused by climatic alteration and volcanic effect. This result indicates that at least 9 pedogenic environmental variations were recorded in the laterite volcanic rock section of Yingfengling.