A PRELIMINARY STUDY OF TRANSIENT AIRBORNE ELECTROMAGNETIC (AEM) SURVEY AS AN AID FOR SEARCHING FOR METALLIC CONDUCTORS | ||||
| Journal of Egyptian Geophysical Society | ||||
| Volume 7, Issue 1, 2009, Page 61-70 PDF (1.14 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jegs.2009.380879 | ||||
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| Author | ||||
| M.E.O. ELMANAWY | ||||
| Exploration Division, Nuclear Materials Authority P.O. Box (530) Elmaady, Cairo, Egypt | ||||
| Abstract | ||||
| The general objective of Induced Pulsed Transient (INPUT) Airborne Electro-Magnetic (AEM) survey is the conduction of rapid and relatively low-cost search for metallic conductors, e.g.,massive sulphides, located in bed-rock and often under the cover of overburden and/or fresh water. This method can be applied in most geological environments except where the country rocks are highly conductive or where overburden is both thick and conductive. It is equally well suited and applied to general geologic mapping, as well as to a variety of engineering problems. Semi-arid areas, particularly with internal drainage, are usually poor in AEM environments. Tidal coasts and estuaries should be avoided. Weathered maific flows can provide strongly conductive backgrounds, particularly flows of Tertiary or Quaternary age. This paper discusses in details the basic principles, induced pulsed transient airborne electro-magnetic, factors affecting delectability, combined AEM / magnetometer surveys, survey data presentation and interpretation A case study area is located at the southern portion of Skinner Lake, over a belt of poorly – exposed greenstones in granite – gneiss terrane of the Canadian Shield. INPUT AEM survey data were integrated with the available geological data. Metallic conductors, massive sulphide zones are characterized by narrow anomalies of limited strike length and highest conductivity values. Meanwhile, graphite and weathered faults zones appear with considerable strike length with lowest conductivities | ||||
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