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库布齐现代沙漠景观发育的沉积学及光释光年代学证据

, PP. 1691-1698

Keywords: 库布齐沙漠,光释光测年,末次冰盛期(LGM),全新世,气候环境变化

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Abstract:

?通过对库布齐沙漠5条南北向断面上的12个探坑和剖面的考察,分析了现代库布齐沙漠景观及下伏地层结构,发现该沙漠风沙沉积直接覆盖于冲洪积相/湖相沉积地层之上.石英的双单片再生法(DoubleSAR)光释光(OSL)测年结果表明,库布齐沙漠的西北部和东部地区最迟分别在距今19和9ka前后开始风沙堆积,在距今7ka风沙活动显著增强,特别是在距今2ka以来,沙漠向南和北扩展,现代库布齐沙漠景观开始形成.库布齐地区距今19,9和7ka前后的风沙堆积可能受到亚洲夏季风衰退的影响,距今2ka前后现代库布齐沙漠地貌景观的形成则更多地受到人类活动的触发.

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