中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地球环境研究所
  3. 中国科学院地球环境研究所
  4. 现代环境研究室
Effects of Ice Freeze-Thaw Processes on U Isotope Compositions in Saline Lakes and Their Potential Environmental Implications

文献类型：期刊论文

作者Zhang, Pu4,5; Cao, Chenyang4; Li, Xiangzhong3; Pei, Xuezheng4; Chen, Chi5; Liang, Lihua4; Ning, Youfeng5; Tan, Liangcheng2; Edwards, R. Lawrence1
刊名FRONTIERS IN EARTH SCIENCE
出版日期2021-12-01
卷号9页码:13
关键词U isotopes saline lakes freeze-thaw processes Qinghai region Qaidam basin
DOI10.3389/feart.2021.779954
通讯作者Zhang, Pu(zhangpu357@xjtu.edu.cn) ; Li, Xiangzhong(xzhli04@163.com)
英文摘要The dissolved uranium (U) content in the water column of saline lakes varies little between ice-free seasons throughout the whole water column. Such uniformity allows for the potential absolute dating and/or paleohydrologic interpretations of lake sediments and biogenic shell materials using U isotopes. Before using these methods in cold regions, however, it is necessary to evaluate the effects that ice freeze-thaw processes have on the distribution of U isotopes in saline lake waters, and to determine the amount of variation in U isotopic values when such processes occur. In this paper, we collected ice and dissolved water samples from six lakes with variable salinity in February 2021. Five groundwater and three water samples from rivers into Qinghai Lake were sampled in November 2020. The sampled water was analyzed for dissolved concentrations of U-238 and the activity ratio of U-234/U-238 ([U-234/U-238](AR)). The results show that the U-238 concentration of ice samples was less than that of the underlying water. The [U-234/U-238](AR) of ice in the five saline lakes was similar to that of the underlying water with less than a 10 parts per thousand variation, suggesting no observable fractionation between ice and dissolved water. Thus, the ice freeze-thaw processes have almost no effect on the uranium content and [U-234/U-238](AR) of the sampled saline lakes, which were characterized by a limited recharge volume from surface runoff, groundwater, and ice volume, namely the close saline lake in arid alpine background. The results from the indoor freeze-thaw experiments also showed that the U isotopic composition of Qinghai Lake waters and ice were similar with the U-238 concentration of the ice was about 40% of that of the dissolved lake water, supporting the data obtained from natural saline lakes. The above results provide important insights into whether it is feasible to use U isotopes for absolute dating and/or paleohydrologic analysis of lake sediments or biogenic shell materials. In addition, the results are important for evaluating the [U-234/U-238](AR) and uranium concentrations in seawater when there exists a process of melting polar ice, and for determining the initial delta U-234 variations needed for dating of coral and other fossil materials.
WOS关键词URANIUM ISOTOPES ; WATER ; CARBONATE ; SEAWATER ; BEHAVIOR ; OCEAN ; GEOCHEMISTRY ; REDUCTION ; QINGHAI ; AQUIFER
资助项目National Natural Science Foundation of China[41873013] ; National Natural Science Foundation of China[41888101] ; U.S. NSF[1702816]
WOS研究方向Geology
语种英语
出版者FRONTIERS MEDIA SA
WOS记录号WOS:000730261800001
资助机构National Natural Science Foundation of China ; U.S. NSF
源URL[http://ir.ieecas.cn/handle/361006/17302]  
专题地球环境研究所_现代环境研究室
通讯作者Zhang, Pu; Li, Xiangzhong
作者单位1.Univ Minnesota, Dept Earth & Environm Sci, Minneapolis, MN USA
2.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian, Peoples R China
3.Yunnan Univ, Res Ctr Earth Syst Sci, Kunming, Yunnan, Peoples R China
4.Northwest Univ, Coll Urban & Environm Sci, Xian, Peoples R China
5.Xi An Jiao Tong Univ, Inst Global Environm Change, Xian, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Pu,Cao, Chenyang,Li, Xiangzhong,et al. Effects of Ice Freeze-Thaw Processes on U Isotope Compositions in Saline Lakes and Their Potential Environmental Implications[J]. FRONTIERS IN EARTH SCIENCE,2021,9:13.
APA Zhang, Pu.,Cao, Chenyang.,Li, Xiangzhong.,Pei, Xuezheng.,Chen, Chi.,...&Edwards, R. Lawrence.(2021).Effects of Ice Freeze-Thaw Processes on U Isotope Compositions in Saline Lakes and Their Potential Environmental Implications.FRONTIERS IN EARTH SCIENCE,9,13.
MLA Zhang, Pu,et al."Effects of Ice Freeze-Thaw Processes on U Isotope Compositions in Saline Lakes and Their Potential Environmental Implications".FRONTIERS IN EARTH SCIENCE 9(2021):13.

入库方式： OAI收割

来源：地球环境研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。