黄土高原全新世土壤锆石颗粒表面超微结构及其发生环境

本文借助于扫描电镜显微镜，对黄土高原三个全新世黄土古土壤剖面中锆石颗粒表面超微结构进行观察，将表面超微结构按外观形态划分为六个种类，并对各类特征发生频数进行定量统计分析，研究表明锆石颗粒有丰富的表面超微结构反映沉积前后的风化作用性质和程度，进而讨论了黄土高原Ｌｏｕ土和黑垆土及其盖层的发生环境。

ULTRAMICROSTRUCTURES OF ZIRCON SURFACE OF HOLOCENE SOILS ON THE LOESS PLATEAU AND ITS ENVIRONMENTS

Twenty-four samples from three Holocene loess profiles on Loess Plateau were selected for zircon surface investigation. Under the scanning electron microscope, six classes of surface ultramicrotextures were identified. Semi-quantitative method was used to calculate the frequencies of occurrence of six classes of surface microstructures. Based on the characteristics of the surface features, the formation of the six-class features could be interpreted by chemical weathering, physical weathering and combinated weathering respectively. The types of zircon surface features and their occurrence frequencies could be used as an index to evaluate the extent and nature of weathering and the pedogenetic changes. Furthermore, pedogenic environments are discussed.