Detailed three dimensional (3D) modelling of resistivity profiling data collected across the long outcropping in situ dyke with significant width ~25-30 m and intruded within the granite host rock was performed to understand the dyke characteristics properties and its role in groundwater flow. Interpretation of the 3D modelling results indicate high resistivity anomaly over the in situ dyke. The modelling study reflected the significant resistivity contrast on the either side of the dyke especially near the contact and very well resolved the shape of the anomaly, which had corroborated with the experimental field resistivity data set of Wenner and Schlumberger array. The dyke with a resistivity of ~200 Ω.m (i.e., weathered part of dyke) at the shallower depth is acting as a conduit, while the same body with a resistivity of ~400 Ω.m (compact dyke) at greater depths behaves as a barrier to the groundwater flow.
Kumar, Dewashish, Krishnamurthy, N.S. 3D modelling of combination of array results for resistivity profiling data over a dyke for groundwater exploration and development. Environ Earth Sci. 79, 401 (2020), https://doi.org/10.1007/s12665-020-09142-9