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Microgranite. In some pisces this coincides wtth a shallov slope down onto the largely unexposed basement complex, In a few places, a fault can be substantiated by the occurrence of microbrecciated microgranite, with quartz-filled fractures, or by nearby man-made exposures of the basement complex. In some sectors the faults are visible on aerial photographs but generally only weakly so. In places, the Barolong Farms Fault appears on the aerial photographs to consist of two aubparallel strands.
However, even after field and photogeological mappin8 of the faults, some uncertainty remained about their position in some sectors. Therefore a series of magnetometer traverses was made across the boundaries of the Granite and the geophysical interpretation was used to refine the geological mapping. The Granite was found to be magnetically 'noisy', with numerous anomalies of small wavelength and amplitude. The basement complex (mostly weathered granitic gneisses) was characteristically 'quiet', generating a smooth magnetometric profile. Control traverses were made where the position of the fault was accurately known, as well as the traverses in the less well-known sectors. On most profiles the position of the boundary fault was marked by an abrupt change from 'noisy' to 'quiet', in several cases with a coincident negative anomaly. In every case, this was consistent with the field and photogeological evidence although there was some ambiguity in the interpretation of one profile across the southern boundary. This ambiguity was partly resolved by postulating an unexposed fault block of Ntlhantlhe Microgranite within the boundary zone. The magnetometer traverses are described and discussed in detail by Aldiss and Bantshang
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