Comparison of 4He ages and 14C ages in simple aquifer systems: implications for groundwater flow and chronologies

Castro, Maria Clara; Stute, M.; Schlosser, Peter

doi:10.1016/s0883-2927(99)00113-4

Cited by 126 publications

(148 citation statements)

References 41 publications

Supporting

Mentioning

142

Contrasting

Unclassified

Order By: Relevance

“…Comparable fluxes of 4 He have been reported for several aquifers (e.g., Heaton 1984;Martel et al 1989;Castro et al 1998a;Beyerle et al 1999a) as well as for lakes (see above). However, other studies found significantly lower 4He fluxes (e.g., Andrews et al 1985;Stute et al 1992b;Castro et al 2000).…”

Section: Dating Of Old Ground Watersmentioning

confidence: 83%

“…This flux may in some cases be useful to estimate the He accumulation rate, but it remains questionable whether the assumption of a uniform flux is justified (e.g., Castro et al 1998b; If it can be demonstrated that in situ production is the dominant 4He source, quantitative dating is possible in situ 4He production rate and the resulting accumulation rate JHe can be calculated from the U and Th concentrations of the aquifer material (Andrews and Lee 1979;Castro et al 2000):…”

Section: Lucas and Unterweger 2000)mentioning

confidence: 99%

“…Due to its strong production in crustal rocks, radiogenic 4He is ubiquitous in ground water and has been detected in numerous studies. It has generally been observed that 4He concentrations increase with ground-water travel time (e.g., Andrews and Lee 1979;Heaton 1984;Torgersen and Clarke 1985;Stute et al 1992b;Castro et al 2000). If the rate of accumulation of radiogenic 4He in an aquifer can be determined, the 4He concentrations can be used to derive ground-water ages over a wide time range.…”

Section: Dating Of Old Ground Watersmentioning

confidence: 99%

“…1996). The crustal He flux may be shielded by underlying aquifers that flush the He out of the system before it can migrate across them (Torgersen and Ivey 1985;Castro et al 2000). Such favorable conditions enabled Aeschbach-Hertig et a1.…”

Section: Dating Of Old Ground Watersmentioning

confidence: 99%

“…The concentrations of non-atmospheric He show an increase as a function of radiocarbon age which is initially dominated by in situ production and later by the accumulation of a crustal He flux (Fig. 23d, Heaton 1984; Castro et al 2000).…”

Section: Noble Gases In Lakes and Ground Watersmentioning

confidence: 99%

See 4 more Smart Citations

Noble Gases in Lakes and Ground Waters

Kipfer

Aeschbach–Hertig

Peeters

et al. 2002

Reviews in Mineralogy and Geochemistry

321

352

View full text Add to dashboard Cite

Section: Dating Of Old Ground Watersmentioning

confidence: 83%

Section: Lucas and Unterweger 2000)mentioning

confidence: 99%

Section: Dating Of Old Ground Watersmentioning

confidence: 99%

Section: Dating Of Old Ground Watersmentioning

confidence: 99%

Section: Noble Gases In Lakes and Ground Watersmentioning

confidence: 99%

See 3 more Smart Citations

Noble Gases in Lakes and Ground Waters

Kipfer

Aeschbach–Hertig

Peeters

et al. 2002

Reviews in Mineralogy and Geochemistry

321

352

View full text Add to dashboard Cite

Freshwater lenses as archive of climate, groundwater recharge, and hydrochemical evolution: Insights from depth‐specific water isotope analysis and age determination on the island of Langeoog, Germany

Houben

Koeniger

Sültenfuß

2014

Water Resources Research

View full text Add to dashboard Cite

The age stratification of a freshwater lens on the island of Langeoog, Germany, was reconstructed through depth-specific sampling and groundwater dating using the tritium-helium method. The stratification is strongly affected by the land use and resulting differences in recharge rates. Infiltration at the dune tops is significantly lower than in the valleys, due to repellency of the dry sand. Dune valleys contribute up to four times more groundwater recharge per area than other areas. Housing development in dune areas might therefore significantly decrease the available fresh groundwater. The freshwater column shows a distinct increase of stable isotope values with decreasing depths. Hence, the freshwater lens contains a climate archive which reflects changing environmental conditions at the time of recharge. Combined with tritium-helium dating, this pattern could be matched to climate records which show an increase of the temperature at the time of recharge and rainfall rates during the last 50 years. The spatial and temporal developments of water chemistry during the passage through the lens follow a marked pattern from a sodium and chloride-dominated rainwater of low conductivity to a more mineralized sodium bicarbonate water type, caused by dissolution of carbonate shells close to the surface and subsequent ion exchange of calcium for sodium in the deeper parts.

show abstract

Natural H₂ in Kansas: Deep or shallow origin?

Guélard

Beaumont

Rouchon

et al. 2017

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Key Points: A new well provide the opportunity of a reappraisal of a persistent regional H 2 production in intracontiental settings, in Kansas. Two different origins are suggested for H 2 production in intra-cratonic context: a crustal origin, a surficial origin. Hypotheses of two H 2 are supported by geochemical properties of associated gases, by water associated and completion story of the well.2 AbstractA geochemical study of gas coming from three wells in northeastern Kansas supplements previous studies from the 1980s and points to a persistent regional phenomenon of H 2 production. In 2008, a new well showed, just after drilling, a dry gas phase with more than 80 mole % of H 2 , followed by a water production associated with gas. This gas is mainly composed of N 2 , He, H 2 and occasionally CH 4 , with changing proportions through time. A drastic decrease in H 2 at the well was observed since the aquifer is produced, along with occasional recharges in H 2 evidenced notably in the early phases of gas sampling. We demonstrate that this evolution of gas composition is closely associated to the well completion story. Accordingly, two distinct origins of H 2 are proposed: (1) water reduction associated to iron oxidation in the Precambrian basement (deep crustal H 2 ); (2) reactions occurring in the tubing, primarily attributed to a high Fe 2+ content and organic carbon (DOC=4.1 mg.L -1 ) dissolved in the water. The low δD values averaging -760 ‰ are attributed to low temperature processes, in agreement with both the hypothesis. Furthermore, the suggested origins are supported by the observed gas associations: (a) deep crustal H 2 with radiogenic gases ( 4 He and 40 Ar) and metamorphic N 2 ( 15 N averaging +2.5‰); (b) surficial H 2 with methane produced in the sedimentary aquifer and the tubing by methanogenic organisms.

show abstract

Comparison of 4He ages and 14C ages in simple aquifer systems: implications for groundwater flow and chronologies

Cited by 126 publications

References 41 publications

Noble Gases in Lakes and Ground Waters

Noble Gases in Lakes and Ground Waters

Freshwater lenses as archive of climate, groundwater recharge, and hydrochemical evolution: Insights from depth‐specific water isotope analysis and age determination on the island of Langeoog, Germany

Natural H₂ in Kansas: Deep or shallow origin?

Contact Info

Product

Resources

About

Comparison of 4He ages and 14C ages in simple aquifer systems: implications for groundwater flow and chronologies

Cited by 126 publications

References 41 publications

Noble Gases in Lakes and Ground Waters

Noble Gases in Lakes and Ground Waters

Freshwater lenses as archive of climate, groundwater recharge, and hydrochemical evolution: Insights from depth‐specific water isotope analysis and age determination on the island of Langeoog, Germany

Natural H2 in Kansas: Deep or shallow origin?

Contact Info

Product

Resources

About

Natural H₂ in Kansas: Deep or shallow origin?