干旱区生态环境知识资源中心(Arid): 巴丹吉林沙漠湖泊年轻沉积物~(14)C测年初步研究

Arid

	巴丹吉林沙漠湖泊年轻沉积物~(14)C测年初步研究
其他题名	A Preliminary Study of AMS ~(14)C Dating of Young Lacustrine Sediments in the Badain Jaran Desert
	陈天源 1; 刘斯文 2; 赖忠平 3; 王振亭 4; 韩凤清 1; 王懿萱 1
来源期刊	盐湖研究
ISSN	1008-858X
出版年	2017
卷号	25 期号:2 页码:60-66
中文摘要	沙漠湖泊沉积物是研究气候环境变化的珍贵材料,湖泊岩芯年代学研究是重建古气候和古环境的基础和前提,然而其年代的测定存在诸多困难,尤其是年轻湖泊沉积物测年一直是当前地质年代学研究的难题。~(14)C测年作为一种传统的测年方法已被广泛应用于各类湖泊年轻沉积物的年代测定。巴丹吉林沙漠湖泊年轻沉积物能否利用~(14)C方法进行测年,其可靠性如何,需进行研究和验证。选择巴丹吉林沙漠腹地的两支岩芯(BR - 1和YD - 1),对其进行了14 C测年,并与已有的210 Pbuns及其推算年代进行了对比。结果表明: 1)沙漠湖泊中的植物残体来源存在较大的随机性,可能是原有的更老沉积层中的植物残体的再沉积,测年结果偏老约1000年。2)湖泊岩芯中有机沉积物样品的年代结果基本符合沉积规律,但受硬水效应的影响,其年代整体偏老400 ~ 900年。3)与~(210)Pb_(uns)年代对比,两种不同测年物质所测得的年代均存在不同程度的偏老现象,表明岩芯所在湖泊~(14)C年龄受多种因素影响,总体存在很大的不确定性。在测年材料极为稀缺的沙漠丘间湖区,利用岩芯中的植物残体、沉积物有机质进行~(14)C测年,可能受老沉积层中测年材料再沉积、湖水碳库效应等因素的影响,~(14)C年代存在诸多不确定性。因此,在对巴丹吉林沙漠丘间湖泊年轻沉积物测年研究过程中应谨慎运用。
英文摘要	Lacustrine sediments in the desert provide valuable archives for studying the climate and environment changes,the research of its chronology is the basis and prerequisite for the reconstruction of paleoclimate and paleoenvironment,however,there are lots of difficulties in dating the lacustrine sediments, especially the dating of young lacustrine sediments is a difficult problem in current geochronology. ~(14)C dating,as a kind of traditional dating method,has been widely applied in all kinds of young lacustrine sediment. Further study and validation of the reliability and applicability of the young lacustrine sediments AMS14 C dating in the Badain Jaran Desert are required. Two sediment cores (BR - 1&YD - 1)in the inter-dune lakes of the Badain Jaran desert hinterland were chosen to make a comparison study between the AMS ~(14)C dating and ~(210)Pb_(uns) dating. The results show that: (1) For the great randomness of the source of plant residues in desert lakes or the redeposition of the plant residues which come from the older stratum,the results of plant residues samples are about 1000 years older than what they actually are. (2) The results of organic sediment samples basically conform to the sedimentological law,but affected by the hard watereffect,it is 400 ~ 900 years older than what they actually are. (3) Compared with the results of ~(210)Pb_(uns) dating,the AMS~(14)C ages of the two materials are older,shows that the AMS~(14)C ages of the lake sediment cores in the Badain Jaran desert are affected by several factors and overall there is a big uncertainty. When the plant residues and the organic sediments which come from the inter-dune lakes of the Badain Jaran desert are used to date,it may be affected by the redeposition of the plant residues which come from the older stratum or the Reservoir Effect. All these factors will lead to a big uncertainty, consequently,more caution should be paid to the AMS~(14)C dating of young lacustrine sediments in the inter- dune of Badain Jaran desert which is lack of dating materials.
中文关键词	AMS14C测年 ; 碳库效应 ; 210Pbuns测年 ; 巴丹吉林沙漠湖泊
英文关键词	AMS 14C Reservoir Effect 210Pbunsdating The Badain Jaran desert
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:6028611
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236873
作者单位	1.中国科学院青海盐湖研究所, 中国科学院盐湖资源综合高效利用重点实验室, 西宁, 青海 810008, 中国; 2.国家地质实验测试中心, 北京 100037, 中国; 3.中国地质大学(武汉), 武汉, 湖北 430074, 中国; 4.中国科学院西北生态环境资源研究院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	陈天源,刘斯文,赖忠平,等. 巴丹吉林沙漠湖泊年轻沉积物~(14)C测年初步研究[J]. 中国科学院西北生态环境资源研究院,2017,25(2):60-66.
APA	陈天源,刘斯文,赖忠平,王振亭,韩凤清,&王懿萱.(2017).巴丹吉林沙漠湖泊年轻沉积物~(14)C测年初步研究.盐湖研究,25(2),60-66.
MLA	陈天源,et al."巴丹吉林沙漠湖泊年轻沉积物~(14)C测年初步研究".盐湖研究 25.2(2017):60-66.