South
Australian Geophysical Models
The
surface model constructed provided the framework for threedimensional
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 threedimensional geological
and geophysical inferences established from observations.
Threedimensional
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 crustallevel 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 crustallevel
model. Similarly, a total of 15 regions was created for the deeper levelcrustal
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 threedimensional grid representation of the shallow crustallevel
structures of the South Australian model. View is towards N335 at
25 degrees elevation. 

Figure 15.
gOcad threedimensional grid representation of the shallow crustallevel
structures of the South Australian model. View is towards N025 at
25 degrees elevation. 

Figure 16.
gOcad threedimensional grid representation of the deeper crustallevel
structures of the South Australian model. View is towards N335 at
25 degrees elevation. 

Figure 17.
gOcad threedimensional grid representation of the deeper crustallevel
structures of the South Australian model. View is towards N025 at
25 degrees elevation. 