Journal article

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

Ian Cartwright, Tamie R Weaver, L Keith Fifield

CHEMICAL GEOLOGY | ELSEVIER SCIENCE BV | Published : 2006

Abstract

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 < 3000 mg/L). By contrast, away from the deep leads,..

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University of Melbourne Researchers