Skip to main content
Article thumbnail
Location of Repository

Mapping depth-to-bedrock and shallow aggregate resources with airborne electromagnetics

By S. Caven, D. Beamish, M. Desissa, M. Patton and M. Young


Airborne electromagnetic (EM) results have been applied to estimating depth-to-bedrock and to mapping shallow aggregate resources in selected areas of Northern Ireland. A detailed low-level airborne survey of Northern Ireland was flown in 2005-6 (the Tellus Project) in which magnetic, gamma-radiation and EM data were acquired. Data were acquired with a range of frequencies and inverted into apparent resistivity. \ud Electrical resistivity of rocks is a function mainly of porosity, pore-water salinity, saturation and clay content. ‘Apparent’ resistivity as measured remotely is a complex function of these variables, of the geometry of the measuring system, and of local geology; the thickness and resistivity of the superficial layer are prominent factors. Depth-to-bedrock may only be determined uniquely where other parameters are consistent, where some local borehole control exists and where there is a contrast in apparent resistivity between bedrock and cover

Topics: Earth Sciences
Publisher: Mineral Deposits Studies Group
Year: 2010
OAI identifier:

Suggested articles

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.