14C age reassessment of groundwater from the discharge zone due to cross-flow mixing in the deep confined aquifer

被引:6
|
作者
Mao, Xumei [1 ]
Wang, Hua [2 ]
Feng, Liang [1 ]
机构
[1] China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China
[2] Xihua Univ, Sch Civil Engn, Chengdu 610031, Sichuan, Peoples R China
基金
中国国家自然科学基金;
关键词
C-14 age reassessment; a(14)C; Cross-flow mixing; The discharge zone; North China Plain; NORTH CHINA PLAIN; CARBON-ISOTOPE FRACTIONATION; DISSOLVED INORGANIC CARBON; ENVIRONMENTAL ISOTOPES; PORE-WATER; RECHARGE; EVOLUTION; DIOXIDE; SYSTEM; SUSTAINABILITY;
D O I
10.1016/j.jhydrol.2018.03.052
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
In a groundwater flow system, the age of groundwater should gradually increase from the recharge zone to the discharge zone within the same streamline. However, it is occasionally observed that the groundwater age becomes younger in the discharge zone in the piedmont alluvial plain, and the oldest age often appears in the middle of the plain. A new set of groundwater chemistry and isotopes was employed to reassess the groundwater C-14 ages from the discharge zone in the North China Plain (NCP). Carbonate precipitation, organic matter oxidation and cross-flow mixing in the groundwater from the recharge zone to the discharge zone are recognized according to the corresponding changes of HCO3- (or DIC) and delta C-13 in the same streamline of the third aquifer of the NCP. The effects of carbonate precipitation and organic matter oxidation are calibrated with a C-13 mixing model and DIC correction, but these corrected C-14 ages seem unreasonable because they grow younger from the middle plain to the discharge zone in the NCP. The relationship of Cl- content and the recharge distance is used to estimate the expected Cl- content in the discharge zone, and In(a(14)C)/Cl is proposed to correct the a(14)C in groundwater for the effect of cross-flow mixing. The C-14 ages were reassessed with the corrected a(14)C due to the cross-flow mixing varying from 1.25 to 30.58 ka, and the groundwater becomes older gradually from the recharge zone to the discharge zone. The results suggest that the reassessed C-14 ages are more reasonable for the groundwater from the discharge zone due to cross-flow mixing.
引用
收藏
页码:572 / 581
页数:10
相关论文
共 23 条
  • [1] 14C groundwater age and the importance of chemical fluxes across aquifer boundaries in confined cretaceous aquifers of North Carolina, USA
    Kennedy, Casey D.
    Genereux, David P.
    [J]. RADIOCARBON, 2007, 49 (03) : 1181 - 1203
  • [2] 14C dating of deep groundwater in the Bengal Aquifer System, Bangladesh: Implications for aquifer anisotropy, recharge sources and sustainability
    Hoque, Mohammad A.
    Burgess, William G.
    [J]. JOURNAL OF HYDROLOGY, 2012, 444 : 209 - 220
  • [3] Using 14C and 3H to understand groundwater flow and recharge in an aquifer window
    Atkinson, A. P.
    Cartwright, I.
    Gilfedder, B. S.
    Cendon, D. I.
    Unland, N. P.
    Hofmann, H.
    [J]. HYDROLOGY AND EARTH SYSTEM SCIENCES, 2014, 18 (12) : 4951 - 4964
  • [4] Carbon isotopes in pore water of the unsaturated zone and their relevance for initial 14C activity in groundwater in the coastal aquifer of Israel
    Carmi, I.
    Kronfeld, J.
    Yechieli, Y.
    Yakir, D.
    Boaretto, E.
    Stiller, M.
    [J]. CHEMICAL GEOLOGY, 2009, 268 (3-4) : 189 - 196
  • [5] C-14 AGES OF CONFINED GROUNDWATER FROM THE GWANDU AQUIFER, SOKOTO BASIN, NORTHERN NIGERIA
    GEYH, MA
    WIRTH, K
    [J]. JOURNAL OF HYDROLOGY, 1980, 48 (3-4) : 281 - 288
  • [6] Investigating the enigma of an irregular groundwater age pattern in a confined, presumed "fossil" complex aquifer through mixing cell flow modeling
    Atencio, Betzabe
    Ram, Roi
    Burg, Avihu
    Yokochi, Reika
    Yechieli, Yoseph
    Purtschert, Roland
    Lu, Zheng-Tian
    Jiang, Wei
    Ronen, Zeev
    Adar, Eilon M.
    [J]. JOURNAL OF HYDROLOGY, 2024, 630
  • [7] Comparison of 4He ages and 14C ages in simple aquifer systems:: implications for groundwater flow and chronologies
    Castro, MC
    Stute, M
    Schlosser, P
    [J]. APPLIED GEOCHEMISTRY, 2000, 15 (08) : 1137 - 1167
  • [8] Understanding the dynamics and contamination of an urban aquifer system using groundwater age (14C, 3H, CFCs) and chemistry
    Mahlknecht, Jurgen
    Hernandez-Antonio, Arturo
    Eastoe, Christopher J.
    Tamez-Melendez, Carol
    Ledesma-Ruiz, Rogelio
    Ramos-Leal, Jose A.
    Ornelas-Soto, Nancy
    [J]. HYDROLOGICAL PROCESSES, 2017, 31 (13) : 2365 - 2380
  • [9] Deep ocean 14C ventilation age reconstructions from the Arctic Mediterranean reassessed
    Ezat, Mohamed M.
    Rasmussen, Tine L.
    Skinner, Luke C.
    Zamelczyk, Katarzyna
    [J]. EARTH AND PLANETARY SCIENCE LETTERS, 2019, 518 : 67 - 75