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

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

Abstract

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: oai:nora.nerc.ac.uk:9953

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