Using hydrogeochemistry to understand inter-aquifer mixing in the on-shore part of the Gippsland Basin, southeast Australia

Hofmann, H. and Cartwright, I. (2013) Using hydrogeochemistry to understand inter-aquifer mixing in the on-shore part of the Gippsland Basin, southeast Australia. Applied Geochemistry, 33 84-103. doi:10.1016/j.apgeochem.2013.02.004


Author Hofmann, H.
Cartwright, I.
Title Using hydrogeochemistry to understand inter-aquifer mixing in the on-shore part of the Gippsland Basin, southeast Australia
Journal name Applied Geochemistry   Check publisher's open access policy
ISSN 0883-2927
1872-9134
Publication date 2013
Sub-type Article (original research)
DOI 10.1016/j.apgeochem.2013.02.004
Open Access Status
Volume 33
Start page 84
End page 103
Total pages 20
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Collection year 2014
Language eng
Subject 2304 Environmental Chemistry
2310 Pollution
1906 Geochemistry and Petrology
Abstract Groundwater in the Latrobe Valley in the Gippsland Basin of southeast Australia is important for domestic, agricultural and industrial uses. This sedimentary basin contains a number of aquifers that are used for water supply, dewatered for open pit coal mining, and which are potentially influenced by off-shore oil and gas production. Major ion chemistry together with stable and Sr isotope data imply that the main hydrogeochemical processes are evapotranspiration with minor silicate and carbonate weathering; methanogenesis and SO4 reduction in reduced groundwater associated with coal deposits have also occurred. Groundwater has estimated 14C ages of up to 36ka and is largely 3H free. Carbon-14 ages are irregularly distributed and poorly correlated with depth and distance from the basin margins. The observations that the geochemistry of groundwater in aquifers with different mineralogies are similar and the distribution of 14C ages is irregular implies that the aquifers are hydraulically connected and horizontal as well as vertical inter-aquifer mixing occurs. The connection of shallow and deeper aquifers poses a risk for the groundwater resources in Gippsland as contaminants can migrate across aquifers and dewatering of shallow units may impact deeper parts of the groundwater system.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
School of Earth Sciences Papers
 
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Created: Thu, 13 Mar 2014, 13:37:30 EST by Ashleigh Paroz on behalf of School of Earth Sciences