干旱区生态环境知识资源中心(Arid): 放射性核素~(210)Pb_(uns)、~(137)Cs测定巴丹吉林沙漠湖泊岩心的年代及沉积速率

Arid

	放射性核素~(210)Pb_(uns)、~(137)Cs测定巴丹吉林沙漠湖泊岩心的年代及沉积速率
其他题名	Determination of Age and Sedimentation Rates Using Radionuclide (~(210)Pb_(uns) and ~(137)Cs) Dating in Inter-dune Lakes of the Badain Jaran Desert,China
	刘斯文; 储国强; 赖忠平
来源期刊	地质学报
ISSN	0001-5717
出版年	2016
卷号	90 期号:8 页码:2013-2022
中文摘要	巴丹吉林沙漠发育了世界上独一无二的沙漠丘间湖泊群,100多个永久性的丘间湖泊分布于沙漠的东南部。沙漠湖泊岩心是干旱地区重要的气候、环境档案,然而受沙漠湖泊发育极端环境的影响,岩心测年面临很大挑战。本文选择巴丹吉林的沙漠南缘的阿尔吉林和敦德吉林丘间湖泊进行钻探,获取无扰动岩心.利用核素 (~(210)Pb_(uns)、~(137)Cs)进行测年,并计算其沉积速率。结果表明:①核素(~(210)Pb_(uns)和~(137)Cs)测年能够获取巴丹吉林沙漠现代丘间湖泊岩心的可靠年代。②巴丹吉林沙漠丘间湖泊岩心Ar-1的CRS模式测年结果为1028a,沉积速率分布范围为0.13-0.33 cm/a,岩心Dd-1的CRS模式测年结果为1232a,沉积速率分布范围为0.18~0.70 cm/a。 ③沙漠岩心沉积速率的空间分布具有自沙漠腹地向边缘递增的趋势,~(210)Pb_(uns)-CRS平均沉积速率分布范围为0.16 ~0.57cm/a,~(137)Cs沉积速率分布范围为0.05~0.6 cm/a。未来,对于沉积速率空间变化的可能影响因素,如高大沙山的围限、阻挡效应、~(137)Cs的分子扩散效应以及古地震影响等应予以关注。
英文摘要	A unique inter-dune lake group containing over 100 permanent lakes developed in the southeast of the Badain Jaran Desert. Inter-dune lake sediments are important climatic and environmental archives in the dryland, but dating these sediments using radionuclides (~(210) Pb,~(137) Cs) is impeded by the extreme environment in the desert, such as low flux of radionuclides caused by rare precipitation. Two lakes in the southeast of the Badain Jaran Desert,Arerjilin and Dundejilin, were drilled and undisturbed core sediments were obtained for dating with ~(210)Pb_(uns) and ~(137)Cs. Results show that:① reliable ages of inter-dune lake sediments can be obtained by radionuclides (~(210)Pb,~(137)Cs) dating;② dating results of Core Ar-1 and Dd-1 are 102 8a and 123 2a respectively based on CRS model, and sedimentation rates of these two cores ranged from 0.13 to 0.33 cm/a, and from 0.18 to 0.70cm/a respectively.③ Sedimentation rates of interdune lake sediments increased from the center to the margin of the desert spatially, and average sedimentation rates ranged from 0.16 to 0.57cm/a if estimated from 7 CRS ages of inter-dune lake sediments, and from 0.16 to 0.57cm/a if estimated from 11 ~(137)Cs ages of inter-dune lake sediments. In the future, much atlention should be paid on the possible inpacting factors on sedimentation rates of inte-dune lake sediments,such as barrier effect of mega-dunes, ~(137)Cs molecular diffusion and even paleoearthquakes.
中文关键词	CRS,湖泊岩心 ; 巴丹吉林沙漠
英文关键词	~(210)Pb_(uns) ~(137)Cs ~(210)Pb_(uns) ~(137)Cs CRS inter-dune lake sediment the Badain Jaran Desert
类型	Article
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:5782609
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234124
作者单位	刘斯文, 国家地质实验测试中心, 北京 100037, 中国.; 储国强, 中国科学院地质与地球物理研究所, 北京 100029, 中国.; 赖忠平, 中国地质大学(武汉)地球科学学院, 武汉, 湖北 430074, 中国.
推荐引用方式 GB/T 7714	刘斯文,储国强,赖忠平. 放射性核素~(210)Pb_(uns)、~(137)Cs测定巴丹吉林沙漠湖泊岩心的年代及沉积速率[J],2016,90(8):2013-2022.
APA	刘斯文,储国强,&赖忠平.(2016).放射性核素~(210)Pb_(uns)、~(137)Cs测定巴丹吉林沙漠湖泊岩心的年代及沉积速率.地质学报,90(8),2013-2022.
MLA	刘斯文,et al."放射性核素~(210)Pb_(uns)、~(137)Cs测定巴丹吉林沙漠湖泊岩心的年代及沉积速率".地质学报 90.8(2016):2013-2022.