SURFACE GEOPHYSICS APPLIED TO THE INVESTIGATION OF DEPOSITS OF PLUTONIC ROCK

GEOPHYSIQUE DE SURFACE APPLIQUEE A LA RECONNAISSANCE DES GISEMENTS DE ROCHES MASSIVES

Using a concrete case as an example the author shows the uses and limitations of surface geophysical investigation for the study of rock deposits. The study deals with A quartzite deposit; the methods utilized are: seismic refraction and resistivity. Calibration was done by means of boreholes executed with a drill hammer. The interpretation of the investigation results is based on the structural study of the deposit. A posteriori observations made during the conduct of the investigation showed the interest of geophysical methods, which enables (1) the thickness of the stripping and of the weathered zone to be predicted, (2) important tectonic faults to be detected (the rock mass is weathered at the contact face), and (3) to establish the limit between geological formations of different physical properties. The use of mapping, based on results obtained with geophysics, permits the division of the deposit into several zones: zones which can be satisfactorily worked; zones to be avoided; doubtful zones. Investigations with drill hammers complete geological and geotechnical data on the characteristics of the workable layer and permit to reach a decision as regards doubtful zones. /TRRL/

  • Corporate Authors:

    Laboratoire Central des Ponts et Chausees (LCPC)

    Boulevard Lefebvre 58
    Paris Cedex 15,   France  F-75732
  • Authors:
    • Chevassu, G
  • Publication Date: 1973-9-10

Language

  • French

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00128297
  • Record Type: Publication
  • Source Agency: Central and Regional Labs of Bridges & Highways,Fr
  • Files: ITRD, TRIS
  • Created Date: Apr 7 1976 12:00AM