Evolution of megadunes and lakes in the Badain Jaran Desert, Inner Mongolia, China during the last 31,000 years
Evolution of megadunes and lakes in the Badain Jaran Desert, Inner Mongolia, China during the last 31,000 years
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DOI：
10.1016/s1040-6182(02)00138-6
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发表时间：
2003-01-01
影响因子：
2.2
通讯作者：
Xiao, HL
中科院分区：
文献类型：
--
作者：
Yang, XP;Liu, TS;Xiao, HL
巴丹吉林沙漠位于中国内蒙古西部，气候温和，沙丘区发育大型沙丘和永久性湖泊。本文的主要目的是描述该沙漠晚更新世以来的景观演变和气候变化。特别注意沙丘和湖泊沉积物以及湖泊的水化学。在沙漠的大沙丘上，观察到了几个钙质胶结层和胶结的植物根系，表明在过去的31,000年里气候相对潮湿。目前的高盐采取充满了新鲜或半咸水之间的9和4 ka BP。根据沙丘形态、地层学和湖泊沉积特征，认为中全新世以来的干旱化是湖泊离子富集和水面下降的主要原因。多湿期的存在意味着晚更新世以来，西风和亚洲季风的强度在这片沙漠中发生了周期性的变化。(C)2002 Elsevier Science Ltd和INQUA。All rights reserved.
The Badain Jaran Desert, located in western Inner Mongolia, China, is characterized by an and climate and by occurrence of large dunes and permanent lakes within the dune field. The main objective of this paper is to describe landscape evolution and climatic change in this desert since the late Pleistocene. Special attention is given to the dune and lake deposits as well as to the water chemistry of the lakes. On the megadunes of the desert several calcareous cementation layers and cemented plant roots were observed, indicating a relatively moister climate during the last 31,000 years. The present hypersaline takes were filled with fresh or brackish water between 9 and 4 ka BP. On the basis of dune morphology and stratigraphy and lacustrine deposits, it is concluded that the enrichment of ions in the lakes and decline of their water surface result from aridification since the middle Holocene. The existence of more humid periods implies that the intensity of westerlies and Asian monsoons has changed perioldically in this desert since the late Pleistocene. (C) 2002 Elsevier Science Ltd and INQUA. All rights reserved.