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ISSN: 2381-8719

Journal of Geology & Geophysics
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Research Article

Preliminary Magnetostratigraphic and Isotopic Dating of the Ngwa Formation (Dschang Western Cameroon)

Benammi M1*, Hell JV2, Bessong M2, Nolla D2, Solé J3 and Brunet M1,4

1Institut de Paléoprimatologie, Paléontologie Humaine: Évolution et Paléoenvironnements (IPHEP), UMR-CNRS 7262, Bâtiment B35, 6 rue Michel.Brunet, 86022 Poitiers Cedex, France

2Institut de Recherches Géologiques et Minières du Cameroun, BP 4140, Yaoundé, Cameroun

3Universidad Nacional Autónoma de México, Instituto de Geología Dept. de Geoquímica Cd. Universitaria, Coyoacán 04510 México DF

4Collège de France, Chaire de Paléontologie humaine, 11 Place Marecelin Berthelot, 75231 Paris cedex 05

*Corresponding Author:
Benammi M
Institut de Paléoprimatologie,
Paléontologie Humaine: Évolution et Paléoenvironnements (IPHEP)
UMRCNRS 7262, Bâtiment B35, 6 rue Michel.Brunet, 86022 Poitiers Cedex,
France
Tel: + 56187897
Fax: +555502486
E-mail: [email protected]

Received date: December 22, 2016; Accepted date: February 17, 2017; Published date: February 23, 2017

Citation: Benammi M, Hell JV, Bessong M, Nolla D, Solé J, et al. (2017) Preliminary Magnetostratigraphic and Isotopic Dating of the Ngwa Formation (Dschang Western Cameroon). J Geol Geophys 6:282. doi: 10.4172/2381-8719.1000282

Copyright: © 2017 Benammi M, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

A magnetostratigraphic study has been carried out to constrain the age of the volcano-sedimentary Ngwa formation in the eastern part of the Dschang region. A stratigraphic section of about 80 meters thick corresponding to 26 sites has been sampled, and it is composed mainly of fine-grained sandstones, clays, lignite, volcanic sediment and tuffs. A magnetic study conducted on 56 samples shows one or two components of magnetization carried either by titanomagnetite, magnetite and Fe-sulphide. The section that was sampled shows one normal polarity and one reversed polarity. In the lower part of the section, a K-Ar radiometric dating was performed on the plagioclase minerals isolated from the tuffs level situated about 15 meters above the lignite seam, and gave an age of 20.1 ± 0.7 Ma. Constrained by this age, the observed polarity zones can be readily correlated with chrons C6An.1n-C6An.1r of the GPTS. This study suggests that the age of the lignite is comprised between 20.04 Ma and 20.21 Ma. The mean direction of the characteristic remanent magnetization documents a counterclockwise vertical axis rotation of about 8° with respect to the expected Lower Miocene direction derived from the Africa polar wander curve.

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