DOI: 10.1016/j.epsl.2018.04.042
Scopus记录号: 2-s2.0-85046681964
论文题名: Application of combined 81Kr and 4He chronometers to the dating of old groundwater in a tectonically active region of the North China Plain
作者: Matsumoto T. ; Chen Z. ; Wei W. ; Yang G.-M. ; Hu S.-M. ; Zhang X.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 493 起始页码: 208
结束页码: 217
语种: 英语
英文关键词: 4He
; 81Kr
; atom trap trace analysis
; groundwater dating
; noble gas
; North China Plain
Scopus关键词: Aquifers
; Helium
; Hydrogeology
; Inert gases
; Krypton
; Trace analysis
; Atom trap
; Groundwater dating
; North China Plain
; ^4He
; ^81Kr
; Groundwater resources
; aquifer
; chronology
; concentration (composition)
; dating method
; groundwater
; helium isotope
; krypton
; sedimentary basin
; tectonic setting
; China
; Israel
; Israeli Coastal Plain
; North China Plain
英文摘要: Groundwater dating by radio-krypton (81Kr; half-life of about 229,000 years) was applied to the sedimentary basin aquifer of the North China Plain (NCP). Krypton gas extracted from deep groundwater in the Coastal Plain was analyzed for 81Kr/Kr ratios by Atom Trap Trace Analysis, which yielded normalized ratios of 0.05 to 0.20, corresponding to groundwater residence times of 0.5–1 million years. Helium isotope compositions were determined on groundwater samples collected from the Central Plain and the Coastal Plain along a flow path of about 200 km. Helium dissolved in the groundwater samples are a mixture of atmospheric, crustal radiogenic and mantle derived sources. Mantle derived 3He contributes up to 30% of the total, and the area of occurrence coincides with zones of previous magmatic/tectonic activities. By contrast, >90% of 4He is derived from crustal reservoirs and correlates with 81Kr ages. The absolute groundwater ages (81Kr) and radiogenic 4He concentrations permit us to calibrate the 4He flux into the aquifer as well as the vertical diffusion rate of 4He to utilize the radiogenic 4He in groundwater as a quantitative age tracer. Previously, groundwater showed 14C activities near the limit of detection (30–40 k yr), in contrast Kr and radiogenic 4He data reveal progressively older ages from the recharge area to the Coastal Plain, from <20,000 yr to 0.5 to 1 Ma along the flow path of the NCP aquifers. © 2018 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109868
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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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; Institute of Hydrogeology and Environmental Geology (IHEG), Chinese Academy of Geological Sciences, Shijiazhuang, 050061, China; Hefei National Laboratory for Physical Sciences at Microscale, iChem Center, University of Science and Technology of China, Hefei, Anhui 230026, China
Recommended Citation:
Matsumoto T.,Chen Z.,Wei W.,et al. Application of combined 81Kr and 4He chronometers to the dating of old groundwater in a tectonically active region of the North China Plain[J]. Earth and Planetary Science Letters,2018-01-01,493