Crustal Structures Inferred from Combined Terrestrial and Earth Gravity Data beneath the Babouri-Figuil and Mayo Oulo-Lere Basins, North Cameroon and South Chad

Bouba Saidou

Department of Physics, University of Maroua, P.O. Box 814, Maroua, Cameroon

Apollinaire Bouba

Department of Physics, University of Maroua, P.O. Box 814, Maroua, Cameroon

Valentin Oyoa

Department of Physics, University of Maroua, P.O. Box 814, Maroua, Cameroon

Kasi Njeudjang

Department of Quality Industrial Safety and Environment, University of Maroua, P.O. Box 814, Maroua, Cameroon

Joseph Kamguia

National Institute of Cartography, P.O. Box 157, Yaoundé, Cameroon

Alidou Mohamadou

Department of Physics, University of Maroua, P.O. Box 814, Maroua, Cameroon


Received: 18 August 2023; Received in revised form: 1 February 2024; Accepted: 27 February 2024; Published: 11 March 2024

Copyright © 2024 Author(s). Published by Nan Yang Academy of Sciences Pte. Ltd.

Creative Commons LicenseThis is an open access article under the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) License.


In this work, the study of the crustal structure of the Babouri-Figuil and Mayo Oulo-Lere sedimentary basins was carried out through the interpretation of gravity data. These data were obtained by combining the terrestrial gravity data obtained from the Earth Gravitational Model 2008. The analysis of the terrestrial Bouguer anomaly maps reveals both negative and positive anomalies. Negative anomalies, i.e., low-density signatures, are interpreted as specific rock types on the basis of the geological knowledge of the region while the positive anomalies are attributed to basaltic rocks underlying a generally granitic environment. The empirical method was used to distinguish anomalies due to deep structures from those due to near-surface structures. This method testifies that the residual map of degree 4 is appropriate. Six profiles are drawn on this residual Bouguer anomaly map and are interpreted using spectral analysis and 2D modeling methods. The results indicate that the mean depths of mass sources at the near-surface of the Babouri-Figuil and Mayo Oulo-Lere sedimentary basins are located at 1.50 km and 1.55 km, respectively. Moreover, the Babouri-Figuil Basin is constituted of two formations while the Mayo Oulo-Lere Basin exhibits three distinct formations. These models also help clarify the geological structure of the study area as well as the thicknesses of the sedimentary basins.

Keywords: Earth Gravitational Model 2008; Bouguer anomaly; Empirical method; Spectral analysis; 2D modeling


[1] Allix, P., Grosdidier, E., Jardiné, S., et al., 1989. Discovery of upper aptian to lower albian dated by microfossils in the cretaceous detrital series of the Benue trough (Nigeria). Comptes-rendus de l’Académie des Sciences de Paris. 2(292), 1291–1295. (in French).

[2] Allix, P., Popoff, M., 1983. The lower cretaceous of the north-eastern part of the Benue trough (Nigeria): An example of a close relationship between tectonics and sedimentation. Bulletin des Centres de Recherches Exploration-Production Elf-Aquitaine. 7, 349–359. (in French).

[3] Dejax, J., Michard, J.G., Brunet, M., et al., 1989. Dinosaur footprints dated to the Lower Cretaceous in the Babouri-Figuil basin (Benue trough, Cameroon). Journal of Geology and Paleontology. 1781, 85–108. (in French).

[4] Ngako, V., Jegouzo, P., Soba, D., 1989. Deformation and metamorphism in the Pan-African Poli chain (Northern-Cameroon): Geodynamic and paleogeographic implications. Journal of African Earth Sciences. 9, 541–555. (in French).

[5] Ndjeng, E., 1992. Studies of the sedimentation and geodynamic model of two Lower Cretaceous basins of Cameroon: Babouri-Figuil and Mayo Oulo-Léré [Ph.D. thesis]. Yaounde: University of Yaounde. (in French).

[6] Colin, J.P., Brunet, M., Congleton, J.D., et al., 1992. Lacustrine ostracods from the Lower Cretaceous basins of Northern Cameroon: Hamakoussou, Koum and Babouri-Figuil. Revue de Paléobiologie. 11(2), 357–372. (in French).

[7] Ndjeng, E., 1994. Pole of the exoscopic characters of the quartz grains of the Garoua sandstone on the interpretation of the palaeoenvironment of the Benue basin of the Upper Cretaceous. Annale de la Faculté des Sciences de l’Université de Yaoundé I 9. 73–82. (in French).

[8] Brunet, M., Dejax, J., Brillanceau, A., et al., 1988. Evidence of early sedimentation of Barremian age in the Benue trough in West Africa (Mayo Oulo-Léré Basin, Cameroon), in relation to the opening of the South Atlantic. Comptes-rendus de l’Académie des Sciences de Paris. 306(II), 1125–1130. (in French).

[9] Bessong, M., 2012. Paleoenvironments and diagenesis in a Cretaceous sandstone reservoir of the Benue trough in North Cameroon: the Garoua sandstone [Ph.D. thesis]. Poitiers: University of Poitiers. (in French).

[10] Ntsama Atangana, J.A., 2013. Magnetostratigraphy and sedimentology of the Cretaceous formations of the Hamakoussou and Mayo Oulo-Léré sedimentary basins in North Cameroon (Benue trough) [Ph.D. thesis]. Poitiers: University of Poitiers. (in French).

[11] Abate Essi, J.M., Marcel, J., Yene Atangana, J.Q., et al., 2017. Interpretation of gravity data derived from the Earth Gravitational Model EGM2008 in the Center–North Cameroon: Structural and mining implications. Arabian Journal of Geosciences. 10, 130. DOI:

[12] Bouba, A., Kamguia, J., Tabod, C.T., et al., 2017. Subsurface Structural Mapping Using Combined Terrestrial and Grace Gravity Data of the Adamawa Plateau (North-Cameroon). International Journal of Geosciences. 8(7), 869–887. DOI:

[13] Ngatchou, H.E., Liu, G., Tabod, C.T., et al., 2014. Crustal structure beneath Cameroon from EGM2008. Geodesy and Geodynamics. 5(1), 1–10. DOI:

[14] Erdem, B.I., Göknar, C., Albora, M.A., et al., 2005. Potential anomaly separation and archeological site localization using genetically trained multi-level cellular neural networks. ETRI Journal. 27(3), 294–303. DOI:

[15] Ndougsa-Mbarga, T.E., Campos-Enriquez, J.O., Yene-Atangana, J.Q., 2007. Gravity anomalies, subsurface structure and oil and gas migration in the Mamfé, Cameroon-Nigeria, sedimentary basin. Geofísica Internacional. 46(2), 129–139. DOI:

[16] Zeng, H., Xu, D., Tan, H., 2007. A model study for estimating optimum upward continuation height for gravity separation with application to a Bouguer gravity anomaly over a mineral deposit, Jilin province, northeast China. Geophysics. 72(4), 145–150. DOI:

[17] Koumetio, F., Njomo, D., Tabod, C.T., et al., 2012. Structural interpretation of gravity anomalies from the Kribi-Edea zone, South Cameroon: A case study. Journal of Geophysics and Engineering. 9(6), 664–673. DOI:

[18] Noutchogwe, T.C., 2010. Geophysical investigation in the Adamaoua region using gravimetric and magnetic methods: structural and hydrogeological implications [Ph.D. thesis]. Yaoundé: University of Yaoundé. (in French).

[19] Bouba, A., Kamguia, J., Nouayou, R., et al., 2018. Crustal structures of the Adamawa Plateau (Cameroon) from combined terrestrial gravity measurements and GRACE Model. European Journal of Scientific Research. 148(2), 277–287.

[20] Toushmalani, R., Saibi, H., 2015. Fast 3D inversion of gravity data using Lanczos bidiagonalization method. Arabian Journal of Geosciences. 8, 4969–4981. DOI:

[21] Farhi, W., Boudella, A., Saibi, H., et al., 2016. Integration of magnetic, gravity, and well data in imaging subsurface geology in the Ksar Hirane region (Laghouat, Algeria). Journal of African Earth Sciences. 124, 63–74. DOI:

[22] Saibi, H., Nishijima, J., Aboud, E., et al., 2006. Euler deconvolution of gravity data in geothermal reconnaissance; the Obama geothermal area, Japan. Journal of Exploration Geophysics of Japan (Butsuri-Tansa). 59(3), 275–282. DOI:

[23] Abubakar, A.J., Hashim, M., Beiranvand, A.P., 2018. Identification of hydrothermal alteration minerals associated with geothermal system using ASTER and Hyperion satellite data: A case study from Yankari Park, NE Nigeria, Geocarto International. 34(6), 597–625. DOI:

[24] Abate Essi, J.M., Marcel, J., Diab, D.A., et al., 2019. Gravity modeling of the Au-U mineralized crust at the North-Central Cameroon illustrating crutal permeability. Natural Resources Research. 29, 473–497. DOI:

[25] Basile, D.M.G.G., Rigobert, T., Dawaï, D., et al., 2019. Geological mapping of the Panafrican Mokong gneisess and granitoides (Far North Cameroon): Contribution of semi-automatic processing from Landsat 8 OLI/TIRS images. Journal of Geosciences. 7(2), 80–87.

[26] Guiraud, R., Maurin, J.C., 1991. Rifting in Africa in the Lower Cretaceous: Structural synthesis, demonstration of two stages in the genesis of the basins, relationships with peri-African oceanic openings. Report of the Geological Society of France. 162(5), 811–823. (in French). DOI:

[27] Gèze, B., 1941. On the volcanic Massifs of Western Cameroon. Report of Academic Sciences of Paris. 212, 498–500. (in French).

[28] Duclaux, F., Martin, J., Blot, C., et al., 1954. Establishment of a general network of gravimetric stations in Africa, Madagascar, Reunion and Mauritius. ORSTOM Editions: Paris. (in French).

[29] Hammer, S., 1939. Terrain corrections of gravimeter stations. Geophysics. 4(3), 184–194. DOI:

[30] Abbass, E.T., Jallouli, C., Albouy, Y., et al., 1990. A comparison of surface fitting algorithms for geophysical data. Terra Nova. 2(5), 467–475. DOI:

[31] Tadjou, J.M., 2004. Contribution of gravimetry to the geophysical investigation of the northern edge of the Congo craton (South Cameroon) [Ph.D. thesis]. Yaoundé: University of Yaoundé. (in French).

[32] Poudjom-Djomani, Y.H., Diament, M., Wilson, M., 1997. Lithospheric structure across the Adamawa plateau (Cameroon) from gravity studies. Tectonophysics. 273(3–4), 317–327. DOI:

[33] Wessel, P., Smith, W.H.F., 1995. New version of the generic mapping tools. Eos Transactions of the American Geophysical Union. 76(33), 329. DOI:

[34] Louis, P., 1970. Geophysical contribution to the knowledge of the Lake Chad basin. OSTROM Memory: Paris. (in French).

[35] Kalvoda, J., Klokočník, J., Kostelecký, J., et al., 2013. Mass distribution of Earth landforms determined by aspects of the geopotential as computed from the global gravity field model EGM 2008. Auc Geographica. 48(2), 17–25. DOI:

[36] Bonvalot, S., Balmino, G., Briais, A., et al., 2012. World gravity map, 1st edition. Bureau Gravimétrique International: Toulouse. (in French). DOI:

[37] Pavlis, N.K., Holmes, S.A., Kenyon, S.C., et al., 2012. The development and evaluation of the Earth Gravitational Model 2008 (EGM2008). Journal of Geophysical Research. 117(B4). DOI:

[38] Weiyong, Y., Rummel, R., 2013. A comparison of GOCE gravitational models with EGM2008. Journal of Geodynamics. 73, 14–22. DOI:

[39] Eyike, A., Werner, S.C., Ebbing, J., et al., 2010. On the use of global potential field models for regional interpretation of the west and central African rift system. Tectonophysics. 492(1–4), 25–39. DOI:

[40] Jitendra, V., Pala, S.K., 2015. Geological mapping of Jharia Coalfield, India using GRACE EGM2008 gravity data: A vertical derivative approach. Geocarto International. 30(4), 388–401. DOI:

[41] Kamguia, J., Manguelle-Dicoum, E., Tabod, C.T., et al., 2005. Geological models deduced from gravity data in the Garoua basin, Cameroon. Journal of Geophysics and Engineering. 2(2), 147–152. DOI:

[42] Li, Y., Oldenburg, D.W., 1998. 3-D inversion of gravity data. Geophysics. 63, 109–119. DOI:

[43] Abdelrahman, E.M., Bayoumi, A.I., Abdelhady, Y.E., et al., 1989. Gravity interpretation using correlation factors between successive least-squares residual anomalies. Geophysics. 54(12), 1614–1621. DOI:

[44] Fedi, M., Quarta, T., De Santis, A., 1997. Inherent power-law behavior of magnetic field power spectra from a Spector and Grant ensemble. Geophysics. 62(4), 1143–1150. DOI:

[45] Johnson, A., MacLeod, I., 2016. Using power spectra for potential field data interpretation: Challenges and cautions. Journal of Geophysics. 37(4), 187–190.

[46] Gérard, A., Griveau, P., 1972. Quantitative interpretation in Gravimetry or Magnetism from the transformed vertical gradient map. Geophysical Prospecting. 20(2), 459–481. (in French). DOI:

[47] Dimitriadis, K., Tselentis, G.A., Thanassoulas, K., 1987. A basic program for 2D spectral analysis of gravity data and source-depth estimation. Computers & Geosciences. 13(5), 549–560. DOI:

[48] Nnangue, J.M., Ngako, V., Fairhead, J.D., et al., 2000. Depths to density discontinuities beneath the Adamawa plateau region, Central Africa, from spectral analyses of new and existing gravity data. Journal of African Earth Sciences. 30(4), 887–901. DOI:

[49] Poudjom-Djomani, Y.H., 1993. Contribution of gravimetry to the study of the continental lithosphere and geodynamic implications: study of an intraplate bulge: The Adamaoua massif (Cameroon) [Ph.D. thesis]. Paris: Paris-Sud University. (in French).

[50] Cooper, G.R.J., 2004. Euler deconvolution applied to potential field gradients. Exploration Geophysics. 35(3), 165–170. DOI:

[51] Talwani, M., Worzel, J.L., Landisman, M., 1959. Rapid gravity computations for two-dimensional bodies with application to the Mendocino submarine fracture zone. Journal of Geophysical Research. 64(1), 49–59. DOI:

[52] Ndjeng, E., Brunet, M., 1998. Model of geodynamic evolution of two basins of the Hauterivian-Barremian of North-Cameroon: The Babouri-Figuil and Mayo Oulo-Léré basins (Benue trough). Geoscience in Cameroon. 163–165. (in French).

[53] Noutchogwe Tatchum, C., Tabod, C.T., Manguelle-Dicoum, E., 2006. A gravity study of the crust beneath the Adamawa fault zone, West Central Africa. Journal of Geophysics and Engineering. 3(1), 82–89. DOI:

[54] Telford, W.M., Geldart, L.P., Sheriff, R.E., et al., 1990. Applied geophysics, 4th edition. Cambridge University Press: Cambridge.

[55] Zanga-Amougou, A., Ndougsa-Mbarga, T., Meying, A., et al., 2013. 2.5D modeling of crustal structures along the Eastern Cameroon and Western Central African Republic derived from finite element and spectral analysis methods. Geophysica. 49(1–2), 75–97.