TITLE:
Magnetic Anomaly Interpretation of the Northern Congo Craton Boundary: Results from Depth Estimation and 2.5D Modeling
AUTHORS:
Basseka Charles Antoine, Eyike Yomba Albert, Kenfack Jean Victor, Njiteu Tchoukeu Cyrille Donald, Som Mbang Constantin Mathieu, Shandini Njankouo Yves
KEYWORDS:
Congo Craton, Magnetic Anomalies, Euler Deconvolution, Tilt Derivative, 2.5D Modeling
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.5 No.12,
December
20,
2017
ABSTRACT: A magnetic-based geophysical
study was performed across the southern part of Cameroon to investigate the boundary
between the Archean Congo craton and the Pan-African metamorphic belt. Magnetic
gradient techniques including Euler deconvolution
and Tilt derivative have been applied to an aeromagnetic data profile to
determine the depth of sources and their lateral extension. 2.5D magnetic modeling shows that the
prominent magnetic positive anomalies observed on total magnetic map of south Cameroon
are produced by deep and strongly magnetic bodies under the Pan-African formations
mainly an important dyke formation structure with a high susceptibility of 0.041
(SI units), at an average depth of 4148 m and with a lateral extension of about
10 km. These bodies are interpreted to have emplaced at high crustal levels in a
continental collision zone and were subsequently metamorphosed at granulite grade
conditions, during the Pan-African orogeny about 620 Ma ago.