Dykes

[des fitzgerald]

HI,
V2.0 Geomodeller now has a lot of new work on modelling dykes.
The first challenge has been to allow for variable width dykes
and then also allow a dyke to split and rejoin.
The means of handling Dykes fits well in with the exitsing primative
geology types and operations.
The structural dip and strike is used with the intensity being co-
opted to reflect the relative thickness
from place to place. The same rules for setting up a fault netwrok
are adapted for dykes.

When it comes to intergartion with potential field geophysics, the
main emphasis is on the magnetic response
as the gravity response is not olikely to be that dominant.
Unlike for visualization, the centre plane of the dyke is being cut
against the topography and a set of adaptive triangles formed to
honour this plane, together with its local thickness. Recent work on
algorithms have given us the abaility to use thin-plate forulaes to
predict the induced field, and all its gradients, including the full
magnetic tensor.
Elements of this work are being shown at SAGA in RSA early September
2009. The similarity of the forward model field to the observed field,
along the lines developed by Naudy, are being used to help resolve
aspects of the dyke models that are not resolved by mapping, such as
depth extent and plunge at depth.
All in all, exciting new developments that you will all get to play
with in the early new year.