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Quantitative Interpretation of Gravity Anomalies in the Kribi-Campo Sedimentary Basin (South Cameroon) Based on Spectral Analysis and 2.5D Modelling: Structural Implications

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Open Journal of Earthquake Research 2020年第3期9卷 240-254页

作者： kue Petou Rokis Malquaire Owona Angue Marie Louise clotilde Njingti Nfor Eloundou Essama Lionel Mioumnde Arthur Paterne kue negham martine clémence Manguelle-Dicoum Eliezer Weiqi Song Department of Geophysics School of Geosciences China University of Petroleum (East China) Qinqdao China Postgraduate School of Sciences Technologies & Geosciences University of Yaoundé I Yaoundé Cameroon National Institute of Cartography Yaoundé Cameroon Department of Physics Advanced Teacher Training College University of Yaoundé I Yaoundé Cameroon Department of Physics University of Yaoundé I Yaoundé Cameroon Laboratory of Ore Processing Institute of Geological and Mining Research Yaoundé Cameroon Department of Geography University of Dschang Dschang Cameroon

Ground gravity survey was recently carried out in the Lolabe-Campo area, which constitutes the southern onshore portion of the Kribi-Campo sub-basin in South Cameroon. The obtained gravity data were processed and interpreted in order to elucidate the subsurface geology of the area in which preliminary studies highlighted the presence of an intrusive igneous body. In order to determine the nature and the characteristics of this body, spectral analysis, ideal body solution and 2.5D modelling methods were applied to the gravity data. The results suggest that the emplacement, breaking up and separation of the intrusive igneous body were the outcome of two tectonic events corresponding to an upward vertical translational tectonic movement followed by an anticlockwise rotational faulting tectonic movement. From a density contrast of 0.13 g·cmǅ, the two isolated bodies have an estimated density of 2.80 g·cmǅ which is comparatively higher than the average density of 2.67 g·cmǅ of the autochthonous rocks. These two blocks are completely surrounded by both sedimentary and metamorphic formations and are confined between the depths of 0.6 km and 3.5 km. The highly dense nature of the rocks and their location around the Atlantic Ocean led to the conclusion that the two intrusive bodies are composed principally of gabbro. The disposition and shape of the open zone resulting from the separation of the blocks are suggestive of a trap for the accumulation of hydrocarbons and mineral resources.

关键词： Spectral Analysis Ideal Body 2.5D Modelling Formation Depth Intrusive Blocks

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