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Regional chemostratigraphic framework of the Neoproterozoic and Middle Ordovician mega-sequences of the Officer Basin, Australia

Created 17/10/2025

Updated 17/10/2025

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The Neoproterozoic to Middle Ordovician sediments of the Officer Basin, Australia are difficult to correlate, in part because biostratigraphic studies of acritarchs and stromatolites are localised, isotopic studies are rare, and seismic models are technically challenged by the occurrence of basaltic and halite prone-sections. Hence, the chemostratigraphic framework presented here provides an independent stratigraphic model for the Neoproterozoic to Middle Ordovician sediments of the Officer Basin. A total of six chemostratigraphic mega-sequences have been geochemically defined and assigned to the stratigraphy; these have been further subdivided into twenty-eight chemostratigraphic sequences. The chemostratigraphic zonation has been established upon elemental changes attributed to provenance and climatic variation which can be used for correlation as they convey regional, rather than local, changes in sedimentation. The elemental data reveals that there is lateral variation within the established lithostratigraphy (e.g., within the members of the Observatory Hill and Hussar formations), which is suggestive of localised sediment source input to different areas of the basin. Presented to the 2022 Central Australian Basins Symposium IV (CABS) 29-30 August (https://agentur.eventsair.com/cabsiv/)

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Field Value
Title Regional chemostratigraphic framework of the Neoproterozoic and Middle Ordovician mega-sequences of the Officer Basin, Australia
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/fb1eb335-4ff4-4d4a-9568-ed71e836c914
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 01/02/2021 - 28/05/2021
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        120.0,
        -30.0
      ],
      [
        143.0,
        -30.0
      ],
      [
        143.0,
        -22.0
      ],
      [
        120.0,
        -22.0
      ],
      [
        120.0,
        -30.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Regional chemostratigraphic framework of the Neoproterozoic and Middle Ordovician mega-sequences of the Officer Basin, Australia". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/regional-chemostratigraphic-framework-of-the-neoproterozoic-and-middle-ordovician-mega-sequence