Geology Reference
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Figure 4. MER2DI Section along Line A and Line B (Mohabatnagar).
formation by cooling and crystallization at different times, development of
cracks and fractures at the time of intrusion in the host material, and
weathering of the contact zone due to water entrance through the fractures.
Even the intrusive bodies may get weathered due to the fracture development
and hence become good groundwater potential zones. With this idea Electrical
Resistivity Tomography (ERT) was carried out at Kothur quartz vein (~25 m
thick) in Maheshwaram watershed. The resistivity image (Fig. 5) has revealed
the weathering effect at the contact zone, which was confirmed by the drilling
of the bore-well. The top red coloured patch is the impression of high
resistive quartz vein; however at coming further deeper it has shown low
resistivity, which is nothing but the weathering and fracturing effect. The
deepening of the weathering front can be clearly seen (as low resistivity) on
either side of the quartz vein.
Figure 5. ERT across a quartz vein near Kothur, Maheshwaram watershed.
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