From Geoscience Australia
JSON format icon JSON RDF format icon RDF ISO19115-3 XML

Mineralogy and chemistry of weathered and parent sedimentary rocks in southwest Queensland

Created 17/10/2025

Updated 17/10/2025

JSON format icon JSON RDF format icon RDF ISO19115-3 XML

Weathered profiles and parent rocks in the Queensland part of the Eromanga Basin were investigated using geochemical and clay mineral techniques. Approximately 170 rock samples were analysed and 65 thin sections described from Winton and Eyre Formations, Morney profile, Canaway profile, Curalle silcrete profile and Haddon silcrete. Rock samples were obtained by shallow stratigraphic core-drilling and from measured outcrop sections. The results obtained show marked differences, between the parent rocks and weathered profiles, and in some instances demonstrate gradational compositional changes within profiles. The Winton Formation contains montmorillonite with lesser amounts of kaolinite, illite, randomly interstratified clays and chlorite. Weathered profiles developed on it (Morney and Canaway profiles) contain kaolinite and lesser illite. The quartzose Eyre Formation is kaolinitic except for the upper part, in which small amounts of montmorillonite occur. Silcrete developed on this formation (Curalle silcrete profile) and subsurface silcrete (Haddon silcrete) are chemically similar and contain kaolinite, illite, and small quantities of montmorillonite. SiIica-enriched zones of all profiles examined show evidence of slight enrichment of titanium.

Files and APIs

Tags

Additional Info

Field Value
Title Mineralogy and chemistry of weathered and parent sedimentary rocks in southwest Queensland
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/fce2c0d9-5bb6-475a-999f-4185e0b61ed2
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        141.0,
        -29.0
      ],
      [
        146.0,
        -29.0
      ],
      [
        146.0,
        -21.0
      ],
      [
        141.0,
        -21.0
      ],
      [
        141.0,
        -29.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Mineralogy and chemistry of weathered and parent sedimentary rocks in southwest Queensland". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/mineralogy-and-chemistry-of-weathered-and-parent-sedimentary-rocks-in-southwest-queensland