TITLE:
2.5-D Earth Crust Density Structure Modeling of the Central Part of Cameroon Using Gravity Data
AUTHORS:
Françoise Martine Enyegue à Nyam, Albert Eyiké Yomba, Alain Rodrigue Nzeuga, Alix Stanislas Soh
KEYWORDS:
Gravity Anomaly, Modeling, Volcanic Intrusions
JOURNAL NAME:
Open Journal of Earthquake Research,
Vol.9 No.3,
May
27,
2020
ABSTRACT: The knowledge of areas of high and low geophysical densities is of paramount importance to better understand the geodynamic, tectonic and geomorphologic evolution of the earth. Several geophysical methods have been developed to achieve this, including a 2.5 D modeling from gravity data, which is the approach used in this work and whose aim is to highlight the causative geological structures of these contrasts in the central part of Cameroon. This zone extends between latitudes 3° and 7° North and longitudes 11° and 16° East. Several filters were applied to the gravimetric and topographic data using the Oasis Montaj software from geosoft in order to develop the different anomaly maps and Grav2dc in order to develop the different geological models of the subsoil. In the final analysis, it appears that this part of Cameroon suggests the presence of granitic rocks and sedimentary rocks whose density contrasts vary between -0.19 and -0.205 g/cm3 observed in the localities of Banyo, Ngaoundere and Abong-Mbang. We also observe the presence of gneiss and volcanic rocks of contrast density varying between 0.0522 to 0.0534 g/cm3 in the locality of Tibati, and granitic intrusions in addition to basic rocks of contrast density varying between 0.285 at 0.29 g/cm3 in the localities of Yoko, Bertoua and Belabo.