TITLE:
Use of the Polynomial Separation and the Gravity Spectral Analysis to Estimate the Depth of the Northern Logone Birni Sedimentary Basin (CAMEROON)
AUTHORS:
Jean Jacques Nguimbous-Kouoh, Simon Ngos III, Theophile Ndougsa Mbarga, Eliezer Manguelle-Dicoum
KEYWORDS:
Gravity Anomalies, Qualitative Interpretation, Spectral Analysis, Logone Birni
JOURNAL NAME:
International Journal of Geosciences,
Vol.8 No.12,
December
29,
2017
ABSTRACT: Many scientists used the power spectrum of the gravity anomaly to obtain the
average depth of the disturbing surface or equivalently the average depth to
the top of the disturbing body. The spectrum of gravity anomaly due to
layered source is separated into multiple segments in frequency domain that
can be interpreted in terms of mean depth of the interface. The half of the
slope of the segments gives the mean depth of the interfaces. This study aims
to estimate the average residual depth anomalies of various regions of the
northern Logone Birni sedimentary basin of Cameroon using polynomial separation
of gravity anomalies, and spectral analysis along different profiles
(segments). The profiles were derived from residual anomaly maps obtained
by fitting the Bouguer anomalies, the interpretation used polynomial separation
and depth average was done using spectral analysis. Positive and negative
residual gravity anomalies were highlighted and their interpretation revealed
the structural directions of the sedimentary basin (NW-SE and NE-SW), as
well as an intimate relationship between the negative anomalies and the
northern Logone Birni sedimentary basin. Three distinct residual anomalies
were identified over the Goulfey, Tom Merifine and Tourba basin with an average
depth varying between 0.24 km and 4.55 km.