Resumo

TADJOU, J. M.; NJINGTI, Nfor; KAMGUIA, J.  e  MANGUELLE, Dicoum E.. GEOPHYSICAL PROSPECTING OF THE TRANSITION ZONE BETWEEN THE CONGO CRATON AND THE PANAFRICAN BELT IN CAMEROON. Earth Sci. Res. J. [online]. 2008, vol.12, n.2, pp.169-180. ISSN 1794-6190.

We made use of the audiomagnetotelluric method to study a major Precambrian boundary between the Congo Craton and the Pan African mobile belt. We have used case studies of areas where magnetotelluric soundings and gravity survey methods have been employed and results analysed and interpreted to show the usefulness of coefficients of anisotropy in magnetotelluric prospecting. We have succeeded in showing that an on the spot calculation of coefficients of anisotropy can, in addition to the method of rotation, be a very useful tool in determining the direction of structural trend of the geologic features in a particular region of prospecting. We have also shown that iso-anisotropy contour maps can provide a more effective and efficient representation of the variation of apparent resistivity with depth for a vertical cross-section through a slice of Earth under consideration. Furthermore, we have used calculated values of coefficient of anisotropy to determine in a vivid manner the types of rocks formations in the region of investigation

Palavras-chave : Audio-magnetotelluric; Apparent resistivity; Coefficient of anisotropy; Iso-anisotropy contour; Structural trend; cross-section.

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