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Crustal architecture along seismic line 22GA-CD2 new insights from the Darling-Curnamona-Delamerian deep seismic reflection survey

Created 17/10/2025

Updated 17/10/2025

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Output type: Exploring for the Future Extended Abstract

Short abstract: Crustal architecture provides first order controls on the distribution of mineral resources of an area and is best imaged by deep seismic reflection data. Here we present a first interpretation of seismic line 22GA-CD2, acquired as part of the Darling-Curnamona-Delamerian (DCD) project. Line 22GA-CD2 images the central eastern Delamerian Orogen, where basement rocks are concealed by the Murray Basin. Key findings include: (i) the crustal architecture preserves many characteristics of the early evolution of west-dipping Delamerian subduction, accretion and orogeny between ~ 515 Ma - 495 Ma. This initial configuration has been reworked and reactivated during younger orogenic events; (ii) the lower and middle crust constitutes the newly defined Barrier Seismic Province, which is also imaged in legacy seismic reflection line 05GA-TL1 and interpreted to continue northeast to the Olepoloko Fault; (iii) a similar seismic character to that of the Barrier Seismic Province has been observed in legacy seismic reflection lines in Victoria and related to a Cambrian accretionary setting and adjacent foreland; (iv) the present-day upper crustal configuration is largely the result of contractional fault reactivation, with significant vertical movements during the Kanimblan-Alice Springs Orogeny (~ 360 Ma - 340 Ma); (v) a large area of prospective rocks for mineral deposits with Cambrian arc-affiliation are accessible to exploration under shallow cover of the Murray Basin (often less than 200 m).    Citation: Doublier M.P., et al., 2024. Crustal architecture along seismic line 22GA-CD2: new insights from the Darling-Curnamona-Delamerian deep seismic reflection survey. In: Czarnota, K. (ed.) Exploring for the Future: Extended Abstracts, Geoscience Australia, Canberra, https://dx.doi.org/10.26186/149658

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Field Value
Title Crustal architecture along seismic line 22GA-CD2 new insights from the Darling-Curnamona-Delamerian deep seismic reflection survey
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/73a6a626-a5fe-4763-973d-8a0688cd7239
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 07/08/2024
Geospatial Coverage
Map data © OpenStreetMap contributors
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      ],
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      ],
      [
        140.0,
        -28.0
      ],
      [
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        -38.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

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This dataset was originally found on Geoscience Australia "Crustal architecture along seismic line 22GA-CD2 new insights from the Darling-Curnamona-Delamerian deep seismic reflection survey". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/crustal-architecture-along-seismic-line-22ga-cd2-new-insights-from-the-darling-curnamona-delame