Cl/Br ratios and environmental isotopes as indicators of recharge variability and groundwater flow: An example from the southeast Murray Basin, Australia

Systematic variations in Cl/Br ratios together with R36Cl values, 14C activities, and δ18O values reflect differences in groundwater recharge and define groundwater flow paths in the Riverine Province of the southeast Murray Basin. In groundwater from the shallowest Shepparton Formation, homogenisat...

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Bibliographic Details
Published in:Chemical geology 2006-07, Vol.231 (1-2), p.38-56
Main Authors: Cartwright, Ian, Weaver, Tamie R., Fifield, L. Keith
Format: Article
Language:English
Subjects:
14C
36Cl
Groundwater
Murray Basin
Recharge
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Summary:Systematic variations in Cl/Br ratios together with R36Cl values, 14C activities, and δ18O values reflect differences in groundwater recharge and define groundwater flow paths in the Riverine Province of the southeast Murray Basin. In groundwater from the shallowest Shepparton Formation, homogenisation of Cl/Br and δ18O values and a decline in 14C activities with depth imply that vertical flow dominates. The 14C activities define variations in pre-land clearing recharge. In the palaeovalleys of present day rivers (“deep leads”), which contain sandier sediments, higher recharge (0.5 to 1.4 mm/year) produced relatively fresh groundwater (TDS
ISSN:0009-2541
1872-6836
DOI:10.1016/j.chemgeo.2005.12.009