Integrated Geophysical Interpretation On A Complex Structure

In 1986 Verwoerd et al published the discovery of a carbonatite on the farm<br>Stukpan east of Bothaville in the Orange Free State (figure 1). The<br>intrusive was initially outlined by an interpretation of gravity data.<br>Subsequent drilling of 2 boreholes (ZL1, RP2) intersected this intrusive and<br>also intersected shallow Central Rand Group rooks, thus implying a horst in<br>the Witwatersrand Super-group. Seismic data in the vicinity of the intrusive<br>are poor and difficult to interpret (figure 2). The deterioration of the<br>data is thought to be caused by the intrusive. Since the intrusive contains<br>magnetite, the aeromagnetic data provides a means by which its position and<br>shape along the seismic section can be determined.