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Petrogenesis of Magnesian High-K Granitoids From Bitkine (Centrechad Massif): Major and Trace Elements Constraints

Author

Listed:
  • Mbaihoudou Diontar

    (Université Polytechnique de Mongo, Cameroon)

  • Jean Claude Doumnang

    (Université de N’Djamena, Cameroon)

  • Maurice Kwékam

    (Université de Dschang, Cameroon)

  • Zagalo Al-hadj Hamid

    (Université de Dschang, Cameroon)

  • Armand Kagou Dongmo

    (Université de Dschang, Cameroon)

  • Julios Efon Awoum

    (Université de Dschang, Cameroon)

  • Jules Tcheumenak Kouémo

    (University of Douala, Cameroon)

Abstract

Major and trace element data were used to constrain the nature and origin of the Bitkine gabbro-diorite magma.The gabbro-diorites of Bitkine within the Guéra Massif, and associated microgranular enclaves consist of plagioclase, k-feldspar, clinopyroxene, amphibole, biotite and quartz. Gabbro-diorites and enclaves are basic to intermediate rocks. They are high-K magnesian calc-alkaline with shoshonite affinity. ΣREE range from 132 to 436 ppm in gabbro-diorites, while they are from 134 to 207 ppm in enclaves. LREE are weakly enriched compared to HREE (La/Yb)N = (12.23 -41.40) and (6.20-31.86) respectively in gabbro-diorites and enclaves. These rocks show a weak negative anomaly in europium (Eu/Eu* = 0.78-1.07). They are rich in Ba and Sr, and show negative anomalies in Nb, Ta and Ti. The Nb/Ta, Rb/Cs and Ba/Nb ratios of the Bitkine gabbro-diorites and their enclaves indicate that they are derived from mantle magma modified by subducted fluids. This magma during its evolution by fractional crystallization was contaminated by crustal materials.

Suggested Citation

Handle: RePEc:epw:ejgeo0:v:1:y:2020:i:5:id:16078
DOI: 10.24018/ejgeo.2020.1.5.78
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