Heliborne em and magnetism for hydrogeological characterization in an obduction context - A new-caledonian example

P. A. Reninger, J. Perrin, S. Lesimple, J. Jeanpert, N. Foged, E. Auken

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingspeer-review

Abstract

Airborne Time Domain ElectroMagnetic (TDEM) and magnetic (MAG) surveys have successfully been used for environmental studies. In igneous provinces, TDEM and MAG data may be jointly interpreted for the characterization of the geological environment. In May 2015, a heliborne survey was conducted in New- Caledonia Island (south-west in the Pacific Ocean) over a small area nearby Koné for hydrogeological characterization. The area is hosted by pre-Late Cretaceous metamorphic unit, Cretaceous formations, two volcanic facies and peridotite massifs, relic of the ophiolite nappe. TDEM and MAG data were separately and jointly interpreted in order to characterize the Koné area. Separately, results obtained from the two methods provided new information on the hydrogeological environment and allow delineating the precise limits of the different geological formations. Jointly, the multilayered results were interpreted using a hierarchical ascendant clustering algorithm. Through a statistical classification of three MAG grids and three TDEM grids, it was possible to propose a predictive geological map for the Koné area. The input will help to better manage the groundwater resources and will be used to position new exploration wells.

Original languageEnglish
Title of host publication2nd European Airborne Electromagnetics Conference 2017, Held at Near Surface Geoscience Conference and Exhibition 2017
PublisherEuropean Association of Geoscientists and Engineers, EAGE
Pages91-95
Number of pages5
ISBN (Electronic)9781510850804
DOIs
Publication statusPublished - 2017
Event2nd European Airborne Electromagnetics Conference 2017 - Malmo, Sweden
Duration: 3 Sep 20177 Sep 2017

Publication series

Name2nd European Airborne Electromagnetics Conference 2017, Held at Near Surface Geoscience Conference and Exhibition 2017

Conference

Conference2nd European Airborne Electromagnetics Conference 2017
Country/TerritorySweden
CityMalmo
Period3/09/177/09/17

Programme Area

  • Programme Area 2: Water Resources

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