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Preprints
https://doi.org/10.5194/se-2020-111
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2020-111
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  23 Jul 2020

23 Jul 2020

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This preprint is currently under review for the journal SE.

Multi-scale analysis and Modeling of aeromagnetic data over the Bétaré-Oya area in the Eastern Cameroon, for structural evidences investigations

Christian Emile Nyaban1, Théophile Ndougsa-Mbarga1,2, Marcelin Bikoro-Bi-Alou3, Stella Amina Manekeng Tadjouteu1, and Stephane Patrick Assembe1,4 Christian Emile Nyaban et al.
  • 1Postgraduate School of Sciences, Technologies & Geosciences, University of Yaoundé I, Yaoundé, Cameroon
  • 2Department of Physics, Advanced Teachers’ Training College, University of Yaoundé I, P.O. Box 47 Yaoundé Cameroon
  • 3Department of Earth Sciences, Faculty of Science, University of Maroua, Maroua, Cameroon
  • 4Department of Physics, Faculty of Science, University of Bamenda, Bamenda, Cameroon

Abstract. This study was carried out in the Lom series in Cameroun, at the border with Central African Republic located between the latitudes 5°30′–6° N and the longitudes 13°30′–14°45′ E. A multi-scale analysis of aeromagnetic data combining tilt derivative, Euler deconvolution, upward continuation and the 2.75D modelling was used. The following conclusion were drawn: 1 – Several major families of faults were mapped. Their orientations are ENE-WSW, E-W, NW-SE, N-S with a NE-SW prevalence. The latter are predominantly sub-vertical with NW and SW dips and appear to be prospective for the future mining investigation. 2 – The evidence of compression, folding and shearing axis, was concluded from superposition of null contours of the tilt-derivative and Euler deconvolution. The evidence of the local tectonics principally due to several deformation episodes (D1, D2 and D4) associated with NE-SW, E-W, and NW-SE events respectively. 3 – Depths of interpreted faults ranges from 1000 to 3400 m. 4 – Several linear structures correlating with known mylonitic veins were identified. These are associated with the Lom faults and represent the contacts between the Lom series and the granito-gneissic rocks; we concluded the intense foldings caused by senestral and dextral NE-SW and NW-SE stumps; 5 – We propose a structural model of the top of the crust (schists, gneisses, granites) that delineates principal intrusions (porphyroid granite, garnet gneiss, syenites, micaschists, Graphite and Garnet gneiss) responsible for the observed anomalies. The 2.75D modelling revealed; many faults with a depth greater than 1200 m and confirmed the observations from RTE-TMI, Tilt derivative and Euler deconvolution; 6 – We developed lithologic profile of Betare Oya basin.

Christian Emile Nyaban et al.

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Christian Emile Nyaban et al.

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Short summary
A multi-scale analysis of aeromagnetic data combining tilt derivative, Euler deconvolution, upward continuation and the 2.75D modelling is applied over Cameroon territory between the latitudes 5°30′–6° N and the longitudes 13°30′–14°45′ E. It emerges that: major families of faults oriented ENE-WSW, E-W, NW-SE, N-S with a NE-SW prevalence are mapped.Depths of Interpreted faults ranges from 1000 to 3400 m; mylonitic veins were identified; 2.75D modelling revealed faults depth greater than 1200 m.
A multi-scale analysis of aeromagnetic data combining tilt derivative, Euler deconvolution,...
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