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Origins of groundwater salinity near Tresco, northwest Victoria

Created 17/10/2025

Updated 17/10/2025

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Core samples and groundwater from bores at Tresco, northern Victoria, in the southern margin of the Murray Basin, have been analysed for palynology and chemistry. An aquifer immediately above the Blanchetown Clay was initially filled with fresh water that became reducing, acidic and rich in dissolved CO, in the early Pleistocene. Later, between 400,000 and 18,000 years B.P., the aquifer was invaded by a series of concentrated NaCI water pulses. These originated from brine pools below salt playa lakes on the ground surface above the aquifer. This saline invasion significantly changed the chemical evolution path of the groundwater. A marine explanation for the observed salinity patterns is not possible.

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Field Value
Title Origins of groundwater salinity near Tresco, northwest Victoria
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/d7af449d-888e-4c33-b799-c2428a795216
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        141.03,
        -38.92
      ],
      [
        145.38,
        -38.92
      ],
      [
        145.38,
        -34.01
      ],
      [
        141.03,
        -34.01
      ],
      [
        141.03,
        -38.92
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Origins of groundwater salinity near Tresco, northwest Victoria". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/origins-of-groundwater-salinity-near-tresco-northwest-victoria