Resistivity imaging for near-surface resistive dyke using two-dimensional DC resistivity techniques

During 1999, DC resistivity data using various configurations with differen t spacings over buried dykes were collected with the SYSCAL-R1 PLUS resisti vity instrument in the Al Quweira area, southwest Jordan, as part of an eco nomic deposit and ore exploration project. The objective of the study was t o evaluate the resolution of resistivity techniques in detecting and locati ng anomalies of vein-like bodies in the Al Quweira area and other locations throughout our geophysical survey program. Resistivity measurements were c arried out utilizing the Wenner array, the single-pole array, the half-Wenn er array and the half-Schlumberger array. The results obtained based on 2-D inversion of field data demonstrated a strong correlation between resistiv ity anomalies and a subsurface vein-like body. A resistive vein exhibits ma rkedly high-resistivity anomalies. In addition, the survey indicated that r esistive vein-like bodies can be detected and located at shallow depths bel ow the surface using the resistivity profiling method. Correlation between field results obtained from different resistivity profiling arrays shows th at the half-Schlumberger array is the most reliable one since it showed det ails over the buried dyke that were only poorly indicated by other arrays. (C) 2001 Elsevier Science B.V. All rights reserved.