The Geological Survey of New South Wales (GSNSW) has developed a statewide 3D fault model of NSW.

The statewide 3D fault model integrates all available geological and geophysical data to determine the geometries of faults and structures that define the architecture of the orogens. Constraining datasets include surface mapping, geological cross-sections, well data, digital elevation models, seismic, gravity and magnetic data and 2D forward models.

The statewide 3D fault model was constructed using data compiled as part of the GSNSW Seamless Geology Dataset, which provides a compilation of the best available mapping data in an internally consistent format (Colquhoun et al. 2018). The 3D model aims to match the seamless dataset as closely as possible within the software processing and interpretation limitations.

The statewide 3D fault model is released as four separated 3D models:

  • Curnamona Province and Delamerian Orogen model
  • Western Lachlan Orogen and southern Thomson Orogen model
  • Eastern Lachlan Orogen model
  • New England Orogen model

Fault Model

Statewide 3D fault model showing the fault architecture along with seismic profiles and cross-sections that constrained the geological interpretation.

The 3D models are available as Geoscience ANALYST projects, GOCAD® and DXF compressed files. The models include fault and topographic surfaces and incorporate fault attribution which is consistent with the seamless geology dataset.

All fault surfaces have the following properties:

  • dip direction
  • dip angle
  • fault depth
  • fault kinematic
  • fault order
  • fault name

The statewide 3D fault model provides a geological framework for future detailed modelling. The model will advance the understanding of the crust, tectonic setting and Phanerozoic geodynamic evolution of eastern Australia, and aid greenfields mineral exploration.

Curnamona Province and Delamerian Orogen 3D model

Projection systems

GDA 1994 Zone 54 and GDA 1994 NSW Lambert

Model extent

Min_X: 480866.81mE / 8705075.25
Max_X: 809307.89mE / 9031800.00

Min_Y: 6210428.78mN / 4375964.53

Max_Y: 6802376.94mN / 4968214.87

Eastern Lachlan Orogen 3D model

Projection systems

GDA 1994 Zone 55 and GDA 1994 NSW Lambert

Model extent

Min_X: 475600.00mE / 9275613.31
Max_X: 861115.75mE / 9660791.84
Min_Y: 5863560.03mN / 4042644.19

Max_Y: 6802579.25mN / 4981602.44

Western Lachlan and Southern Thomson orogens 3D model

Projection systems

GDA 1994 Zone 55 and GDA 1994 NSW Lambert

Model extent

Min_X: -972.75mE / 8798676.31

Max_X: 530250.11mE / 9330308.53
Min_Y: 5999589.06mN / 4178645.44

Max_Y: 6840805.69mN / 5020096.50

New England Orogen 3D model

Projection systems

GDA 1994 Zone 56 and GDA 1994 NSW Lambert

Model extent

Min_X: 220540.80mE / 9598738.62

Max_X: 540208.06mE / 9925346.00
Min_Y: 6312283.18mN / 4483173.19

Max_Y: 6868783.00mN / 5031923.12

Comments

Updates will be ongoing, with the addition of lithological and structural infill of the model, as new constraining geological and geophysical data become available.

References

Colquhoun, G.P., Hughes, K.S., Deyssing, L., Ballard, J.C., Phillips, G., Troedson, A.L., Folkes, C.B., Fitzherbert, J.A., 2018. New South Wales Seamless Geology dataset, version 1 [Digital Dataset]. Geological Survey of New South Wales, NSW Department of Planning and Environment, Maitland.

File origin software

SKUA-GOCAD™

Contact

Giovanni Spampinato, Senior Geoscientist - Geophysics & 3D modelling