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Arabian Journal of Geosciences

, Volume 7, Issue 11, pp 4641–4664 | Cite as

Tchabal Gangdaba massif in the Cameroon Volcanic Line: a bimodal association

  • Zénon Itiga
  • Jacques-Marie Bardintzeff
  • Pierre Wotchoko
  • Pierre Wandji
  • Hervé Bellon
Original Paper

Abstract

Tchabal Gangdaba (TG) volcanic massif, which is a part of the continental sector of the Cameroon Volcanic Line (CVL), is dated between 34.4 and 25.1 Ma. It displays mafic lavas (picrobasalt and basanite, 41–43 wt % SiO2) and felsic lavas (rhyolite, 68–73 wt % SiO2). The lack of intermediate rocks evidences a pronounced Daly gap between 43 and 68 wt % SiO2, which corresponds to an important time span of 3.4 Ma. It is interpreted as due to extensive fractional crystallization under peculiar thermodynamical conditions. Felsic lavas yield strong negative anomalies in Ba, Sr and Eu (0.1 < Eu/Eu* < 0.3) reflecting alkali feldspar and plagioclase fractionation and in Ti reflecting titanomagnetite and ilmenite fractionation. All TG rocks are enriched in LREE and mildly fractionated, which suggests enriched mantle sources. Sr initial isotopic ratios ranging from 0.7033 to 0.7059, εNd from +2.89 to +4.64 and Pb isotopic ratios of 18.988 < 206Pb/204Pb < 19.998, 15.592 < 207Pb/204Pb < 15.673 and 38.948 < 208Pb/204Pb < 39.648 are typical of an enriched mantle source close to HIMU and FOZO. A discrete Sr crustal leaching is evidenced.

Keywords

Cameroon Volcanic Line Tchabal Gangdaba Fractional crystallization Daly gap Magmatic bimodality 

Notes

Acknowledgments

The authors are grateful to the French Ministry of Foreign affairs which, by the means of the SCAC of Yaoundé, supported fees of chemical analyses and the financial support of one of the field work on the TG, through the Project CORUS-CAMPUS entitled “L’évolution volcano-structurale du Crétacé à l’Actuel de la Ligne du Cameroun” co-directed by P.W. and J.M.B. Thanks also to D. Demaiffe of the Laboratoire de Géochimie Isotopique, Université Libre de Bruxelles, Belgium, who has conducted the measure of isotopic data. L. Daumas has drawn figures. B. Bonin, G. Delpech, J.P. Liegeois, A.R. McBirney, B. Platevoet are thanked for useful remarks. Careful reviews by two anonymous reviewers have greatly helped to improve the manuscript.

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© Saudi Society for Geosciences 2013

Authors and Affiliations

  • Zénon Itiga
    • 1
  • Jacques-Marie Bardintzeff
    • 2
    • 3
    • 4
  • Pierre Wotchoko
    • 5
  • Pierre Wandji
    • 6
  • Hervé Bellon
    • 7
  1. 1.Institute for Geological and Mining Research (IRGM)Branch of Volcanologic and Geophysics Research (ARGV)YaoundéCameroon
  2. 2.IUFMUniv Cergy-PontoiseCergy-PontoiseFrance
  3. 3.Univ Paris-Sud, Laboratoire de Pétrographie-Volcanologie and équipe PlanétologieOrsayFrance
  4. 4.CNRS, OrsayOrsayFrance
  5. 5.École Normale Supérieure, Laboratoire de GéologieUniv BamendaBamendaCameroon
  6. 6.École Normale Supérieure, Laboratoire de GéologieUniv Yaoundé IYaoundéCameroon
  7. 7.CNRS UMR 6538 Domaines océaniques, UBO-IUEMUniversité européenne de BretagneBrest Cédex 3France

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