The ion chemistry of lakes and late Holocene desiccation in the Badain Jaran Desert,Inner Mongolia,China
作者单位：Department of Geographical and Environmental StudiesAdelaide UniversityAdelaideSouth Australia 5005.Australia
会议名称：《中国科学院地质与地球物理研究所2003学术年会》
会议日期：2003年
学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学]
基 金：financed by the National Natural Science Foundation of China (Grant no.:49902015) the NKBRSF Project G1999043400 the Chinese Academy of Sciences(Grant no.:KZ952-S1-438)and Adelaide University,Australia
关 键 词：Deserts Limnology Ground water Paleosalinity Holocene Inner Mongolia China
摘 要：In the markedly arid Badain Jaran Desert,one of the least-studied areas in the world,over a hundred permanent lakes exist among the *** geochemistry of water samples from nine lakes and from the groundwater in the desert and on its periphery was *** chemistry of the water from these desert lakes changes considerably on a regional *** argue that there is a positive correlation between the ages of these lakes and their totally dissolved solids(TDS) varying between 1.2 and 398.2 g/*** analysis of groundwater in wells gives an age generally older than four decades and younger than 100 *** lacustrine deposits,freshwater fauna and shorelines indicate the existence of large water bodies with low salinities in the inter-dune hollows of this desert during the early and middle *** precipitation in this desert during the early and middle Holocene was estimated to be ca.200 mm/year on average,at least twice as high as at *** the basis of paleoecology,TL and radiocarbon ages,it was concluded that the huge enrichment of ions in the lakes and decrease of water availability originated from climatic desiccation during the last 4000 *** paleoclimate of the Badain Jaran Desert reported here was remarkably consistent with the late Quaternary climatic histories of the regions to the immediate north,west,east and south of the study area.