Huynh, T., Betts, P. G. and Ailleres, L. 2001. Three-dimensional Modelling of Lithospheric-scale Structures of South Australia. In: Jessell, M. J. 2001. General Contributions: 2001. Journal of the Virtual Explorer.
Three-dimensional Modelling of Lithospheric-scale Structures of South Australia.

South Australian Geophysical Models

The surface model constructed provided the framework for three-dimensional geophysical modelling. This geophysical modelling approximation is based on a spatially consistent volumetric framework delimited from the surface objects. The geophysical responses generated from the models represent anomaly responses and not the total potential field response (Jessell, 1997). These results attempt to reconcile the three-dimensional geological and geophysical inferences established from observations.

Three-dimensional Grid Models
The generated grid model consists of regions specific to each of the modelled block units. These regions comprise an assembly of volume elements that are defined for every point in the modelled block, and globally in the entire model space. The dimensions of individual volume elements for the upper and deeper crustal-level models were designed as 2 cubic kilometres and 5 cubic kilometres respectively.

South Australian Petrophysical Models
A composite grid model of 37 regions corresponding to 28 main lithological units and lithospheric structures was created for the upper crustal-level model. Similarly, a total of 15 regions was created for the deeper level-crustal scale model. These regions are illustrated in figures 14 to 17 and are directly analogous to the surface model representation shown in figures 10 to 13.
Figure 14. gOcad three-dimensional grid representation of the shallow crustal-level structures of the South Australian model. View is towards N335 at 25 degrees elevation.

Figure 15. gOcad three-dimensional grid representation of the shallow crustal-level structures of the South Australian model. View is towards N025 at 25 degrees elevation.

Figure 16. gOcad three-dimensional grid representation of the deeper crustal-level structures of the South Australian model. View is towards N335 at 25 degrees elevation.

Figure 17. gOcad three-dimensional grid representation of the deeper crustal-level structures of the South Australian model. View is towards N025 at 25 degrees elevation.