| Peer-Reviewed

Quantification of Strain of the Pan-African in Mvog-Betsi Area (Yaoundé Group, Cameroon)

Received: 30 March 2018     Accepted: 24 April 2018     Published: 25 May 2018
Views:       Downloads:
Abstract

The ductile deformation in the paragneissic bed of Mvog-Betsi in the north-eastern part of Yaounde (Cameroon) appears to be intensive and may be traduced by a high shear rate (more than 10%). Some marker subjects that may quantify this strain are observed. Those are elliptical quartz and feldspar, and folds. The study of elliptical markers shows their preferential orientation. The initial rate Ri of the markers before the strain approaches 3.76, and the harmonic value of Rf is between 1.51 and 1.71. Main orientation Øf of strain’s ellipse from the direction of stretching in actual position is situated between -10 and -19. The strain’s rate RS is comprised between 1.1 and 1.7. The orientation ØS of the strain’s ellipse is situated between N10E and N20E. The rate of shortening varies between 20% and 75%.

Published in International Journal of Environmental Monitoring and Analysis (Volume 6, Issue 2)
DOI 10.11648/j.ijema.20180602.11
Page(s) 40-46
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2018. Published by Science Publishing Group

Keywords

Strain, Method, Rate of Deformation, Yaoundé Group, Cameroon

References
[1] Ball, E, Bard, J., P., Soba, D., 1984. Tectonique tangentielle dans la catazone du Cameroun: Les gneiss de Yaoundé. J. Afr. Earth Sci. Vol. n°2, P. 91-95.
[2] Nzenti J., P: 1987. Pétrogénèse des migmatites de Yaoundé (Cameroun): élément pour un modèle géodynamique de la chaîne Pan-africaine Nord-équatoriale. Thèse de l’Université de Nancy I. 147 p.
[3] Mpesse, J., E., 1999. Contribution à l’étude pétrostructurale des formations métamorphiques de la région de Yaoundé et définition de la géométrie de sa tectonique tangentielle. Thèse doct. 3è cycle, Univ. de Yaoundé I, 148.
[4] Mpesse J. E., Lissom, J., Mvondo Ondoa, J., Njom B., Frisch Wolfgan, (2002). Plis en fourreau dans les migmatites panafricaines de Yaoundé preuve d’une déformation chevauchante progressive. Sci. Technol. Dev. vol. 9. n01, 37-43.
[5] Jegouzo, 1984. Déformation chevauchante et cisaillante dans la zone mobile d’Afrique centrale au Cameroun. Coll. Chevauchement et Deformation, Toulouse.
[6] Nédélec, A., Macaudière, J., Nzenti, J. P., Barbey, P., 1986. Evolution structurale et métamorphique des schistes de Mbalmayo (Cameroun). Implications pour la structure de la zone mobile panafricaine d'Afrique Centrale, au contact du craton du Congo. Comptes Rendus de l'Académie des Sciences, Paris 303, 75–80.
[7] Maurizot P, Abessolo A, Feybesse A, Johan JL, Lecompte P (1986). Etude et prospection minière au Sud Ouest Cameroun. Synthèse des travaux de 1978-1985. Rap. BRGM, 85, CNRS 066, Orléans: 274.
[8] Nzenti JP, Barbey P, Macaudiere J, Soba D (1988). Origin and evolution of the late Precambrian high-grade Yaounde gneisses (Cameroon). Precamb. Res. 38:91-109.
[9] Minyem, D., 1994. Contribution a` l’étude de l’évolution métamorphique et structurale du secteur Eséka-Makak (Cameroun, Département du Nyong et Kelle, Province du Centre). The` se Doc. 3e Cycle, Universite´ Yaounde´ I, 166 p.
[10] Ngako, V., Affaton, P., Nnangue, J,. M; and Njanko, Th. 2003. Pan-African tectonic evolution in central and southern Cameroon: transpression and transtension during sinistral shear movements. Journal of African Earth Sciences, 36, 207-214.
[11] Mvondo Ondoa, J., and Essono, J., 2007. Tectonic evolution of the Yaoundé segment of the Neoproterozoic Orgogenic Belt in South Cameroon (central Africa). Canadian Journal of Earth Sciences, 44, 443-444.
[12] Pengcheng Fu and Yannis F. Dafalias 2012. Quantification of large and localized deformation in granular materials. Elsevier, Volume 49, Pages 1741–1752.
[13] Ramsay, J., G., 1967. Folding and fracturing of rocks. M. C. Graw-Hill, New-York. 568p.
[14] Dunnet, D., 1969. A technique of finite strain analysis using elliptical markers. Tectonophysics, V. 7, n 2, P. 117-136.
[15] Dunnet, D. and Siddans, A., B., 1971. Non-random sedimentary fabrics and their modification by strain. Tectonophysics, 12, 307-325.
[16] Lisle, R., J., 1979. Strain analysis using deformed pebble shape: the influence of initial pebble shape. Tectonophysics, 60: 263-277; Amsterdam.
[17] Peach, C. J. & Lisle, R. J. 1979. A Fortran IV program for the analysis of tectonic strain using deformed elliptical markers. Comput. Geosci. 5, 325-334.
[18] Ratschbacher, L., Meschede, M., Spener, B., and Pfänder, J. 1994. Computer-techniken und andwendungen: Eine Computer-programmbibliothek zur quantitativen Strukturanalyse. Tubinger Geowissenschaflitche Arbeiten (TGA). Reihe A, Band 21, 73.
[19] Lisle, R., J., 1985. Geological strain analysis: a manual for the Rf/Ø technic. Pergamon Press, Oxford, 99p.
[20] De Paor, D., G., 1988. Rf/Øf strain analysis using an orientation net. J. of Structural geology, 10, pp. 323 to 333, Oxford.
[21] Olinga, J., B., Mpesse, J., E., Minyem, D., Ngako, V., Ndougsa Mbarga, T. and Ekodeck, G., E., 2010. The Awaé–Ayos strike-slip shear zones (southern Cameroon): geometry, kinematics and significance in the late pan-african tectonics, Yaoundé. N. Jb. Geol. Paläont. Abh. 257/1, 1–11.
[22] Mvondo; H. Den Brok, S. W. J., Mvondo Ondoa, J., 2003. Evidence for symmetric extension and exhumation of Yaoundé nappe (Pan-African fold belt, Cameroon). Journal of African Earth Sciences 36, 215-231.
[23] Castaing C, Feybesse JL, Thiéblemont D, Triboulet C, Chèvremont P (1994). Palaeogeographical reconstructions of the Pan-African/Brasiliano orogen: closure of an oceanic domain or intracontinental convergence between major blocks? Precamb. Res., 69 (1-4): 327-344.
Cite This Article
  • APA Style

    Jean Engelbert Mpesse, Joseph Martial Akame, Eric José Messi Ottou, Bernard Njom, Sébastien Owona, et al. (2018). Quantification of Strain of the Pan-African in Mvog-Betsi Area (Yaoundé Group, Cameroon). International Journal of Environmental Monitoring and Analysis, 6(2), 40-46. https://doi.org/10.11648/j.ijema.20180602.11

    Copy | Download

    ACS Style

    Jean Engelbert Mpesse; Joseph Martial Akame; Eric José Messi Ottou; Bernard Njom; Sébastien Owona, et al. Quantification of Strain of the Pan-African in Mvog-Betsi Area (Yaoundé Group, Cameroon). Int. J. Environ. Monit. Anal. 2018, 6(2), 40-46. doi: 10.11648/j.ijema.20180602.11

    Copy | Download

    AMA Style

    Jean Engelbert Mpesse, Joseph Martial Akame, Eric José Messi Ottou, Bernard Njom, Sébastien Owona, et al. Quantification of Strain of the Pan-African in Mvog-Betsi Area (Yaoundé Group, Cameroon). Int J Environ Monit Anal. 2018;6(2):40-46. doi: 10.11648/j.ijema.20180602.11

    Copy | Download

  • @article{10.11648/j.ijema.20180602.11,
      author = {Jean Engelbert Mpesse and Joseph Martial Akame and Eric José Messi Ottou and Bernard Njom and Sébastien Owona and Jean Bosco Olinga and Justin Lissom and Joseph Mvondo Ondoa},
      title = {Quantification of Strain of the Pan-African in Mvog-Betsi Area (Yaoundé Group, Cameroon)},
      journal = {International Journal of Environmental Monitoring and Analysis},
      volume = {6},
      number = {2},
      pages = {40-46},
      doi = {10.11648/j.ijema.20180602.11},
      url = {https://doi.org/10.11648/j.ijema.20180602.11},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijema.20180602.11},
      abstract = {The ductile deformation in the paragneissic bed of Mvog-Betsi in the north-eastern part of Yaounde (Cameroon) appears to be intensive and may be traduced by a high shear rate (more than 10%). Some marker subjects that may quantify this strain are observed. Those are elliptical quartz and feldspar, and folds. The study of elliptical markers shows their preferential orientation. The initial rate Ri of the markers before the strain approaches 3.76, and the harmonic value of Rf is between 1.51 and 1.71. Main orientation Øf of strain’s ellipse from the direction of stretching in actual position is situated between -10 and -19. The strain’s rate RS is comprised between 1.1 and 1.7. The orientation ØS of the strain’s ellipse is situated between N10E and N20E. The rate of shortening varies between 20% and 75%.},
     year = {2018}
    }
    

    Copy | Download

  • TY  - JOUR
    T1  - Quantification of Strain of the Pan-African in Mvog-Betsi Area (Yaoundé Group, Cameroon)
    AU  - Jean Engelbert Mpesse
    AU  - Joseph Martial Akame
    AU  - Eric José Messi Ottou
    AU  - Bernard Njom
    AU  - Sébastien Owona
    AU  - Jean Bosco Olinga
    AU  - Justin Lissom
    AU  - Joseph Mvondo Ondoa
    Y1  - 2018/05/25
    PY  - 2018
    N1  - https://doi.org/10.11648/j.ijema.20180602.11
    DO  - 10.11648/j.ijema.20180602.11
    T2  - International Journal of Environmental Monitoring and Analysis
    JF  - International Journal of Environmental Monitoring and Analysis
    JO  - International Journal of Environmental Monitoring and Analysis
    SP  - 40
    EP  - 46
    PB  - Science Publishing Group
    SN  - 2328-7667
    UR  - https://doi.org/10.11648/j.ijema.20180602.11
    AB  - The ductile deformation in the paragneissic bed of Mvog-Betsi in the north-eastern part of Yaounde (Cameroon) appears to be intensive and may be traduced by a high shear rate (more than 10%). Some marker subjects that may quantify this strain are observed. Those are elliptical quartz and feldspar, and folds. The study of elliptical markers shows their preferential orientation. The initial rate Ri of the markers before the strain approaches 3.76, and the harmonic value of Rf is between 1.51 and 1.71. Main orientation Øf of strain’s ellipse from the direction of stretching in actual position is situated between -10 and -19. The strain’s rate RS is comprised between 1.1 and 1.7. The orientation ØS of the strain’s ellipse is situated between N10E and N20E. The rate of shortening varies between 20% and 75%.
    VL  - 6
    IS  - 2
    ER  - 

    Copy | Download

Author Information
  • Department of Earth Sciences, Faculty of Sciences, University of Douala, Douala, Cameroon

  • Department of Earth Sciences, Faculty of Sciences, University of Yaoundé I, Yaoundé, Cameroon

  • Department of Earth Sciences, Faculty of Sciences, University of Yaoundé I, Yaoundé, Cameroon

  • Department of Earth Sciences, Faculty of Sciences, University of Yaoundé I, Yaoundé, Cameroon

  • Department of Earth Sciences, Faculty of Sciences, University of Douala, Douala, Cameroon

  • Institut of Geological and Mining Research, Yaounde, Cameroon

  • Department of Earth Sciences, Faculty of Sciences, University of Douala, Douala, Cameroon

  • Department of Earth Sciences, Faculty of Sciences, University of Yaoundé I, Yaoundé, Cameroon

  • Sections