
TY  - JOUR
A1  - Dransfield, M.H. 
A1  - Buckingham, M.J. 
A1  - van Kann, F.J. 
T1  - Lithological mapping by correlating magnetic and gravity gradient airborne measurements
JF  - Exploration Geophysics
JO  - Explor. Geophys.
Y1  - 1994
VL  - 25
IS  - 1
SP  - 25
EP  - 30
KW  - 
UR  - https://doi.org/10.1071/EG994025 
N2  - We report here two new applications of the Poisson relation useful when a joint magnetic and gravity gradient survey has been made. In the first, an apparent susceptibility contrast to density contrast ratio map (which we call the "pseudo-lithology" map) can be estimated. In the second, selected values of the above ratio are used in a "pseudo-magnetic" filter to subtract from the magnetic field measurements the effect of a particular rock type. This would be especially useful as a filter of "geological noise" due perhaps to weathered magnetite products, particularly if the latter had an effect over a large area. As a test of these techniques we have applied them to a simulated joint airborne survey over a model which we designate "Mini-Elura", in which the magnetic magnitude and vertical gravity gradient anomalies are not visible above the noise due to surficial variations. The computed pseudo-lithology map clearly distinguishes the regions of the map dominated by the alluvium source from those due to the "Mini-Elura" orebody, while the pseudo-magnetic filter does very effectively remove the "noise" due to the alluvium from the magnetic map. 
ER  -

