气候变化领域集成服务门户(CCPortal): Krypton-81 dating of the deep Continental Intercalaire aquifer with implications for chlorine-36 dating

CCPortal

DOI	10.1016/j.epsl.2020.116120
	Krypton-81 dating of the deep Continental Intercalaire aquifer with implications for chlorine-36 dating
	Matsumoto T.; Zouari K.; Trabelsi R.; Hillegonds D.; Jiang W.; Lu Z.-T.; Mueller P.; Zappala J.C.; Araguás Araguás L.J.; Romeo N.; Agoun A.
发表日期	2020
ISSN	0012821X
卷号	535
英文摘要	Deep groundwater samples from the Continental Intercalaire (CI) aquifer in the Northern Tunisian Sahara have been analyzed for noble gases 3He, 4He, Ne and 81Kr, and for 14C to better constrain the groundwater residence time of this large transboundary aquifer. Its significant radiogenic 4He content and background-level 14C both indicate water older than a few tens of thousands of years. Distinct helium concentrations and Ne/He ratios suggest different groundwater flow paths through the Tozeur and Kebili regions. 81Kr is applied for the first time on the CI aquifer, providing more direct evidence for the presence of old groundwater with 81Kr/Kr ratios at 63% – 15% of the atmospheric value, corresponding to residence times of 150 – 630 ka. These newly obtained 81Kr ages enable a re-evaluation of the previously reported data from the Tozeur region in order to better constrain the input values of 36Cl/Cl and Cl. The initial 36Cl/Cl ratio is found to be 4 – 6 times larger than previously assumed, and the initial Cl concentration 6 – 15 times smaller. The results of 81Kr dating and the recalibrated 36Cl dating define an eastward age progression across >500 km of flow path from the Algerian to Tunisian sections. This study exemplifies the utility of 81Kr not only as an independent and conservative chronometer, but also as a supplemental measurement to better calibrate the parameters required for other age tracers, including cosmogenic 36Cl and radiogenic 4He. © 2020 Elsevier B.V.
关键词	atom trap trace analysis carbon 14 groundwater dating intercalaire aquifer krypton-81 noble gas
英文关键词	Aquifers; Atmospheric movements; Chlorine; Groundwater flow; Inert gases; Krypton; Atom trap; Carbon 14; CL-concentrations; Deep groundwaters; Groundwater dating; Groundwater residence time; Helium concentrations; Transboundary aquifers; Groundwater resources; aquifer; carbon isotope; chlorine isotope; concentration (composition); dating method; krypton; Sahara; Tunisia
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202772
作者单位	Isotope Hydrology Section, Division of Physical and Chemical Sciences, Department of Nuclear Sciences and Applications, International Atomic Energy Agency, Vienna International Centre, PO Box 100, Vienna, 1400, Austria; Laboratory of Radio-Analysis and Environment, National School of Engineers, University of Sfax, B.P 1173, Tunisia; Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, OX1 3AN, United Kingdom; Hefei National Laboratory for Physical Sciences at the Microscale, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China; Physics Division, Argonne National Laboratory, Lemont, IL 60439, United States; Direction Générale des Ressource en Eau (DGRE), Montfleury Superieur, Tunis, Tunisia
推荐引用方式 GB/T 7714	Matsumoto T.,Zouari K.,Trabelsi R.,et al. Krypton-81 dating of the deep Continental Intercalaire aquifer with implications for chlorine-36 dating[J],2020,535.
APA	Matsumoto T..,Zouari K..,Trabelsi R..,Hillegonds D..,Jiang W..,...&Agoun A..(2020).Krypton-81 dating of the deep Continental Intercalaire aquifer with implications for chlorine-36 dating.Earth and Planetary Science Letters,535.
MLA	Matsumoto T.,et al."Krypton-81 dating of the deep Continental Intercalaire aquifer with implications for chlorine-36 dating".Earth and Planetary Science Letters 535(2020).