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The hydrogeochemistry of groundwater in fractured bedrock aquifers beneath dryland salinity occurrences at Yass, NSW

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Created 20/01/2025

Updated 20/01/2025

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Fresh to brackish groundwaters in the range of 250 to 2250 mglL occur in fractured bedrock aquifers beneath dryland salinity sites at Yass in the Southern Tablelands of New South Wales. The fractured bedrock in these catchments comprises marine, early Paleozoic slates, shales and sandstones in Dicks Creek and Williams Creek catchments, and porphyritic dacite and rhyodacite in Spring Creek catchment. The groundwaters are known to originate from recent meteoric waters. The waters represent various hydrochemical types, generated by chemical processes through water-rock interactions along their flow paths. The present chemical composition of major cations and anions in groundwaters from these catchments is derived from the following processes: 1. water-rock interaction in recharge zones where dissolution of minerals and oxidation processes occur, 2. ion-exchange and reverse ion exchange reactions with clay where it is present in fractures and veins in the bedrock, and 3. microbially mediated reactions with organic matter which produce very low redox potentials.

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Title The hydrogeochemistry of groundwater in fractured bedrock aquifers beneath dryland salinity occurrences at Yass, NSW
Language eng
Licence Not Specified
Landing Page https://devweb.dga.links.com.au/data/dataset/299a2e8e-d9e1-4ef7-ad6c-e0c72efe3f52
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
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Data Portal Data.gov.au