干旱区生态环境知识资源中心(Arid): 高精度光释光测年揭示的晚第四纪毛乌素和浑善达克沙地沙丘的固定与活化过程

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	高精度光释光测年揭示的晚第四纪毛乌素和浑善达克沙地沙丘的固定与活化过程
其他题名	Active and Inactive Phases of Sand-dune in Mu Us and Otindag Sandlands during Late Quaternary Suggested by OSL Dating
	周亚利 1; 鹿化煜 1; 张家富 2; 周力平 3; 苗晓东 4
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2005
卷号	25 期号:3 页码:342-350
中文摘要	利用光释光测年技术对毛乌素沙地和浑善达克沙地7个地点的沉积剖面进行了年代测试,结合地层特征,获得了最近60 ka BP以来两个沙地沙丘固定与活化时间的年代学控制:60 ka BP以来毛乌素沙地的固定期分别为:距今37.71 ka、8.54 ka、8.32 ka、7.93 ka、7.77 ka、7.57 ka、7.39 ka和2.39 ka以后;活化的时间分别为:距今57.08 ka、52.50 ka、13.65 ka、13.13 ka、7.20 ka前后、2.39 ka以前和0.29 ka以来.在10.97 ka BP、10.04 ka BP、9.81 ka BP和8.67 ka BP前后沙地处于气候干湿交替时期.全新世期间,浑善达克沙地在距今8.74～8.72 ka、7.79 ka前后,沙丘活化;5.69 ka BP、4.25 ka BP、2.75 ka BP、1.53 ka BP和0.71 ka BP前后,沙丘处于相对固定阶段,0.15 ka BP以来,沙丘处于半固定状态.晚第四纪气候千年至百年尺度的变化可能是两个沙地沙丘活化与固定的主导因素.
英文摘要	The loess-desert transition zone in north China is sensitive to reflect climate changes, and it is one of the key sites to investigate the history of past environmental changes. Optical stimulated luminescence dating (OSL) has been used to obtain the ages of seven profiles in Mu Us and Otindag sandlands. All the sed-iments are aeolian originations. Our results provide chronology constrain to active and inactive phase of sand dunes in the two sandlands during the past 60 000 years: the sand dunes are stable at 37. 71 ka BP, 8. 54 ka BP, 8. 32 ka BP, 7. 93 ka BP, 7. 77 ka BP, 7. 57 ka BP, 7. 39 ka BP and late 2. 39 ka BPin Mu Us sandland, and paleosol were developed. Whereas, the sand dunes are mobile at around 57. 08 ka BP, 52. 50 ka BP, 13. 65 ka BP, 13.13 ka BP, 7. 20 ka BP and 2. 39 ka BP. In Otindag sandland, the moveable phases of sand dunes took place at 8. 74~8. 72 ka BP and 7. 79 ka BP respectively, the inactive periods occurred at 5. 69 ka BP, 4. 25 ka BP, 2. 75 ka BP, 1. 53 ka BP, 0. 71 ka BP and 0. 15 ka BP to now, the sandland is dominated by semi-stabilized sand dunes. Though the active and inactive phases in Mu Us and Otindag sandlands are not al-ways at the same time, the changes are consistent with variations of the East Asia monsoon. Furthermore, there are two samples whose single-aliquot De values are likely scattered distribution to some extent, possi-bly because of heterogeneous variations in microdosimetry and biodisturbing during burial of the sediments, or there is water reworking on the aeolian deposit.
中文关键词	光释光测年 ; 晚第四纪 ; 毛乌素沙地 ; 浑善达克沙地 ; 沙丘固定与活化
英文关键词	OSL dating the later Quaternary Mu Us sandland Otindag sandland active and inactive phase of sand dunes
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY
WOS研究方向	Geology
CSCD记录号	CSCD:1996971
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/206979
作者单位	1.中国科学院地球环境研究所, 黄土与第四纪地质国家重点实验室, 西安, 陕西 710075, 中国; 2.北京大学环境学院, 北京 100871, 中国; 3.北京大学,环境学院, 北京 100871, 中国; 4.University of Wisconsin Madison, USA
推荐引用方式 GB/T 7714	周亚利,鹿化煜,张家富,等. 高精度光释光测年揭示的晚第四纪毛乌素和浑善达克沙地沙丘的固定与活化过程[J],2005,25(3):342-350.
APA	周亚利,鹿化煜,张家富,周力平,&苗晓东.(2005).高精度光释光测年揭示的晚第四纪毛乌素和浑善达克沙地沙丘的固定与活化过程.中国沙漠,25(3),342-350.
MLA	周亚利,et al."高精度光释光测年揭示的晚第四纪毛乌素和浑善达克沙地沙丘的固定与活化过程".中国沙漠 25.3(2005):342-350.