Evidence for terrigenic SF6 in groundwater from basaltic aquifers, Jeju Island, Korea: Implications for groundwater dating

Koh, Dong‐Chan; Plummer, L. Niel; Busenberg, Eurybiades; Kim, Yongcheol

doi:10.1016/j.jhydrol.2007.03.011

Cited by 61 publications

(23 citation statements)

References 39 publications

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“…The high SF 6 values are probably due to the presence of pegmatite veins in the surrounding fractured granites, source of terrigenous SF 6 (Deeds et al, 2008;Friedrich et al, 2013;Harnisch and Eisenhauer, 1998). Terrigenic SF 6 can thus affect the groundwater dating (Koh et al, 2007). As no SF 6 source is likely in the lower aquifer, groundwater flow from the granite to the lower aquifer is suspected in particular since a gradual increase in residence time from the granites to the lower aquifer has been highlighted (Cf.…”

Section: Tracing Groundwater Origins Using Sfmentioning

confidence: 99%

Residence time, mineralization processes and groundwater origin within a carbonate coastal aquifer with a thick unsaturated zone

Santoni

Huneau

Garel

et al. 2016

Journal of Hydrology

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Section: Tracing Groundwater Origins Using Sfmentioning

confidence: 99%

Residence time, mineralization processes and groundwater origin within a carbonate coastal aquifer with a thick unsaturated zone

Santoni

Huneau

Garel

et al. 2016

Journal of Hydrology

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“…In addition, in most of the samples, SF 6 apparent ages were significantly lower than those for CFCs. The excess SF 6 from terrigenic source such as rocks in volcanic terrains and granites that are common in the study area Gooddy et al, 2006;Koh et al, 2007;Santella et al, 2008;Asai et al, 2011), may explain the inconsistency between CFCs and SF 6 -based ages, and, therefore SF 6 -based ages were not considered in the conceptualization model of the groundwater.…”

Section: O and Dd Isotopic Signatures Of Groundwater In The Lncmentioning

confidence: 99%

“…While CFCs and SF 6 , which have a continuous known variations in concentration in the atmosphere over the last 60 years work as an age tracer of groundwater . The combination of the information from these environmental tracers, can provide valuable insight into mechanism and movement of water that recharged after 1950 (Gooddy et al, 2006;Koh et al, 2007;Stadler et al, 2010). These transient tracers have been successfully used to determine groundwater origin, recharge ages and flow paths of water in many studies (e.g., Plummer et al, 2001;Gooddy et al, 2006;Kazemi et al, 2006;Koh et al, 2007;Stadler et al, 2010;Asai et al, 2011;Darling et al, 2012;Friedrich et al, 2013;Molénat et al, 2013;Ako et al, 2013), thus contributing enormously to our understanding of the complex hydraulic dynamics of shallow aquifers.…”

Section: Introductionmentioning

confidence: 99%

“…However, there are a number of additional factors that could potentially complicate the use of CFCs and SF 6 in fractured rock aquifers. These factors include (i) diffusion of the atmospheric signal through vadose zones thicker than $10 m, (ii) minor to moderate sorption of some CFCs species, (iii) microbial degradation of some CFCs under strongly reducing conditions and (iv) anthropogenic and natural sources of SF 6 Manning et al, 2005;Koh et al, 2007;Santella et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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A multi-tracer approach for assessing the origin, apparent age and recharge mechanism of shallow groundwater in the Lake Nyos catchment, Northwest, Cameroon

Kamtchueng

Fantong

Wirmvem

et al. 2015

Journal of Hydrology

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Keywords:Stable isotopes (d 18 O and dD) CFCs and SF 6 Shallow groundwater origin and age Shallow groundwater recharge Lake Nyos -Cameroon s u m m a r yThe shallow aquifer in the vicinity of Lake Nyos (Northwest, Cameroon) is one of the main water supply sources to meet the water needs of the inhabitants to be resettled after 1986s tragedy. Unfortunately, there is a lack of knowledge on the groundwater recharge and flow systems in the area. Multiple environmental tracers (d 18 O, dD, Cl À , CFCs and SF 6 ) and a yearly record of rainfall, surface waters and groundwater were employed to characterize the recharge mechanism of the shallow groundwater seeping in the fractured rock of the Lake Nyos catchment (LNC). The d 18 O-dD relationship of the rainfall events gave the Nyos Meteoric Water Line: dD = 8.28 d 18 O + 11.87. Inland moisture vapor may have impacted the isotopic composition of original vapor masses from Gulf of Guinea prior to precipitation. Shallow groundwater in the LNC shows a similar trend of enrichment in 18 O and D as surface waters indicating a well-mixed aquifer. The proportions of surface waters and rainfall in the groundwater reservoir were 87% and 13%, respectively. The high annual recharge rate (941 mm/yr) and the seasonal variability in the isotopic signatures of groundwater indicate a renewable aquifer system. CFCs apparent ages-based piston flow model revealed a young age (average of 24 a.) of the groundwater in the LNC. SF 6 -based ages were biased young as compared to relatively younger than CFCs-based ages, implying an additional terrigenic production of SF 6 . The conceptual model for groundwater flow suggests that three main flow regimes, mainly controlled by the physical properties of the rock heterogeneities govern the movement of water in the aquifer. The piston flow model appears, however, to be the better model to explain the flow regime in the highly faulted and fissured area where recharge occurs ($1200-1600 masl). The rapid circulation and the low solubility lead to low mineralization. In the middle-lower area where waters circulate more in the weathered layer, exponential mixing model dominates, yielding more mineralized water. Downward to the valley, with prevailing gentle slope, interaction between surface and recently infiltrated groundwater better explain the observed similarity in the isotopic compositions and the mineralization of water.

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“…The piston-flow model has been widely used in hydrogeology (Burton et al, 2002;Koh et al, 2007Koh et al, , 2006Plummer et al, 2001;Solomon et al, 2010). It is strictly valid only when cumulative mixing with different concentration values along the flow line and in the sampling zone is limited enough so that information carried by the tracer concentrations travels unaltered.…”

Section: Use Of Environmental Tracers For Constraining Aquifer Propermentioning

confidence: 99%

Contribution of age data to the characterization of complex aquifers

Leray

Dreuzy

Bour

et al. 2012

Journal of Hydrology

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Evidence for terrigenic SF6 in groundwater from basaltic aquifers, Jeju Island, Korea: Implications for groundwater dating

Cited by 61 publications

References 39 publications

Residence time, mineralization processes and groundwater origin within a carbonate coastal aquifer with a thick unsaturated zone

Residence time, mineralization processes and groundwater origin within a carbonate coastal aquifer with a thick unsaturated zone

A multi-tracer approach for assessing the origin, apparent age and recharge mechanism of shallow groundwater in the Lake Nyos catchment, Northwest, Cameroon

Contribution of age data to the characterization of complex aquifers

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