河西走廊榆木山前土壤发育特征及其随时间的演变关系(英文)

SOIL DEVELOPMENT PROPERTIES AND THEIR EVOLUTION WITH TIME IN THE PIEDMONT OF THE YUMUSHAN MOUNTAINS OF THE HEXI CORRIDOR

在河西走廊榆木山前开展了旨在用于活动构造测年工作的土壤发育年代学新方法的研究．通过在不同时代河流阶地上开挖土壤探槽、系统采集土壤样品并进行化学成分分析，以及对各级河流阶地形成年代的１４Ｃ和热释光年龄测定，详细研究了该区与断层新活动有关的土壤发育的主要物理和化学特性及其随时间（年代）的演变规律，初步建立起了土壤ＣａＣＯ３含量和ＣａＣＯ３累积指数值与发育年代之间的定量计算关系式．经回检和对比分析认为，所建立的定量计算关系式可适用于同类地区活动断层和晚第四纪堆积地貌面的实际测年工作．

This is a methodological research on the chronology of soil development with the view of dating active structures in the piedmont of the Yumushan mountains of the Hexi corridor,China. Based on chemical analyses of soil samples systematically collected from test pits dug on terraces of different periods and 14 C and thermoluminescence dating of these terraces,the authors made a detailed study on the primary physical and chemical features of soil development in this region related to the new fault activities,as well as their evolution law with time. The quantitative relations of the content and accumulation index value of CaCO 3 in soils to ages of soil development were established preliminarily. Examination and contrastive analysis show that the established formulae are applicable to the active fault dating in similar areas.