1887

Abstract

Summary

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.

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/content/papers/10.3997/2214-4609.201702166
2017-09-03
2024-04-23
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References

  1. Auken, E., Christiansen, A.V., Westergaard, J.H., Kirkegaard, C., Foged, N. and Viezzoli, A.
    [2009] An integrated processing scheme for high-resolution airborne electromagnetic surveys, the SkyTEM system. Exploration Geophysics, 40, 184–192.
    [Google Scholar]
  2. Baptiste, J., Martelet, G., Faure, M., Beccaletto, L., Reninger, P.-A., Perrin, J. and Chen, Y.
    [2016] Mapping of a buried basement combining aeromagnetic, gravity and petrophysical data: The substratum of southwest Paris Basin, France. Tectonophysics, 683, 333–348.
    [Google Scholar]
  3. Chongo, M., Christiansen, A. V., Tembo, A., Banda, K. E., Nyambe, I. A., Larsen, F. and Bauer-Gottwein, P.
    [2015] Airborne and ground-based transient electromagnetic mapping of groundwater salinity in the Machile-Zambezi Basin, southwestern Zambia. Near Surface Geophysics, 13, 383–395.
    [Google Scholar]
  4. Gautier, P., Quesnel, B., Boulvais, P. and Cathelineau, M.
    [2016] The emplacement of the Peridotite Nappe of New Caledonia and its bearing on the tectonics of obduction. Tectonics, 35, 3070–3094.
    [Google Scholar]
  5. Martelet, G., Truffert, C., Tourlière, B., Ledru, P. and Perrin, J.
    [2006] Classifying airborne radiometry data with Agglomerative Hierarchical Clustering: a tool for geological mapping in context of rainforest (French Guiana). International Journal of Applied Earth Observation and Geoinformation, 8, 208–223.
    [Google Scholar]
  6. Reninger, P.A., Martelet, G., Deparis, J., Perrin, J. and Chen, Y.
    [2011] Singular value decomposition as a denoising tool for airborne time domain electromagnetic data. Journal of Applied Geophysics, 75, 264–276.
    [Google Scholar]
  7. Salem, A., Williams, S., Fairhead, D., Smith, R. and Ravat, D.
    [2008] Interpretation of magnetic data using tilt-angle derivatives. Geophysics, 73, L1–L10.
    [Google Scholar]
  8. Silva, J.B.C. and Hohmann, G.W.
    [1984] Airborne magnetic susceptibility mapping. Exploration Geophysics, 15, 1–13.
    [Google Scholar]
  9. Sørensen, K.I. and Auken, E.
    [2004] SkyTEM — a new high-resolution helicopter transient electromagnetic system. Exploration Geophysics, 35, 191–199.
    [Google Scholar]
  10. Viezzoli, A., Christiansen, A.V., Auken, E. and Sørensen, K.I.
    [2008] Quasi-3D modeling of airborne TEM data by spatially constrained inversion. Geophysics, 73, F105–F113.
    [Google Scholar]
  11. Vittecoq, B., Reninger, P.-A., Violette, S., Martelet, G., Dewandel, B. and Audru, J.-C.
    [2015] Heterogeneity of hydrodynamic properties and groundwater circulation of a coastal andesitic volcanic aquifer controlled by tectonic induced faults and rock fracturing — Martinique island (Lesser Antilles — FWI). Journal of Hydrology, 529, 1041–1059.
    [Google Scholar]
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