Flow of river water into a karstic limestone aquifer - 2. Dating the young fraction in groundwater mixtures in the Upper Floridan aquifer near Valdosta, Georgia

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LDEO Publication: 
Publication Type: 
Year of Publication: 
1998
Editor: 
Journal Title: 
Applied Geochemistry
Journal Date: 
Nov
Place Published: 
Tertiary Title: 
Volume: 
13
Issue: 
8
Pages: 
1017-1043
Section / Start page: 
Publisher: 
ISBN Number: 
0883-2927
ISSN Number: 
Edition: 
Short Title: 
Accession Number: 
ISI:000077480600007
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Abstract: 

Tritium/helium-3 (H-3/He-3) and chlorofluorocarbon (CFCs, CFC-11, CFC-12, CFC-113) data are used to date the young fraction in groundwater mixtures from a karstic limestone aquifer near Valdosta, Georgia, where regional paleowater in the Upper Floridan aquifer receives recharge from two young sources - the flow of Withlacoochee River water through sinkholes in the river bed, and leakage of infiltration water through post-Eocene semi-confining beds above the Upper Floridan aquifer. In dating the young fraction of mixtures using CFCs, it is necessary to reconstruct the CFC concentration that was in the young fraction prior to mixing. The H-3/He-3 age is independent of the extent of dilution with older (H-3-free and 3He(trit)-free) water. The groundwater mixtures are designated as Type-1 for mixtures of regional paleowater and regional infiltration water and Type-2 for mixtures containing more than approximately 4% of river water. The fractions of regional paleowater, regional infiltration water, and Withlacoochee River water in the groundwater mixtures were determined from Cl- and delta(18)O data for water from the Upper Floridan aquifer at Valdosta, Georgia.

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147GKTimes Cited:25Cited References Count:51

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