Comparative field results for electrical resistivity, magnetic, gravity and LVF methods over a marble lens

A. Aina; M.O. Olorunfemi

doi:10.1071/EG996217

ISSN: 0812-3985
E-ISSN: 1834-7533

Comparative field results for electrical resistivity, magnetic, gravity and LVF methods over a marble lens
Authors A. Aina^a and M.O. Olorunfemi^b
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^a Department of Physics, University of Lagos, , Lagos, , Nigeria, . ^b Department of Geology, Obafemi Awolowo University, , lle-lfe, , Nigeria, .
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 27, Issue 4, Sep 1996, p. 217 - 222
DOI: https://doi.org/10.1071/EG996217
- Published online: 01 Sep 1996

Abstract

Electrical resistivity, magnetic, gravity and VLF data obtained along five W-E traverses in a basement complex area of southwestern Nigeria were used to delineate the areal extent of a marble lens situated in a geologic setting consisting of calc gneiss and schist. The methods show diagnostic anomalies over the deposit. The marble deposit is characterised by a local low-amplitude resistivity high, a modest reduction in magnetic field intensity and a local low-amplitude gravity high. When the overburden thickness is significant, the magnetic method displays the best resolution of the target. Any of the methods can be used in delineating the marble, most especially when the overburden is thin. The VLF method is sensitive to vertical discontinuities within the marble deposit and could therefore be relevant in lithological contact delineation.

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References

Aina, A., and Emofurieta, W. O., 1991, VLF anomalies at contacts between Precambrian rocks in southwestern Nigeria: Geoexploration 28, 55-65.
Folami, S.L., and Ojo, J.S., 1991, Gravity and magnetic investigation over marble deposits in the Igarra area, Bendel State: J. Min. Geol. 27, 49-54.
Ghosh, D.R, 1971, Inverse filter coefficient for the computation of apparent resistivity standard curves for a horizontally stratified earth: Geophys. Prosp. 19, 769-775.
Hockey, R.D., Sacchi, R, de Graff, W.P.F.H., and Muotoh, E.O.G., 1986, The geology of Lokoja - Auchi Area: Geol. Surv. Nigeria. Bull. 39, 9-18.
Odeyemi, I.B., 1976, Preliminary report on the field relationships of the basement complex rocks around Igarra: In Geology of Nigeria, Ed. C.A. Kogbe: Elizabethan Publishing Co., Lagos, Nigeria.
Olorunfemi, M.O., and Okhue, E.T., 1992, Hydrogeologic and geologic significance of a geoelectric survey at lle-lfe, Nigeria: J. Min. Geol. 28, 221-229.
Rahaman, M.A., 1976, Review of basement geology of southwestern Nigeria. In Geology of Nigeria. Ed. C.A. Kogbe: Elizabethan Publishing Co., Lagos, Nigeria.
Telford, W.M., Geldart, L.R, Sheriff, R.E., and Keys, D.A., 1976, Applied Geophysics: Cambridge University Press, Cambridge.

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Article Type: Research Article

Keyword(s): Comparison of geophysical methods; Field Surveys; Gravity; Magnetics; Marble; Profiles; Resistivity; VLF-EM

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Comparative field results for electrical resistivity, magnetic, gravity and LVF methods over a marble lens

Abstract

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