Petrogenesis of metaluminous and peraluminous granitoids from Garga-Sarali zone : evidence of I- and S-type sources (central African fold belt in Cameroon)

  • Authors

    • Daama Isaac University of Ngaoundere
    • Mbowou Gbambie Isaac Bertrand UNIVERSITY OF NGAOUNDERE, Cameroon
    • Nguihdama Dagwaï University of Maroua
    • Ngounouno Ismaïla University of Maroua
    2024-04-24
    https://doi.org/10.14419/gd4zjr47
  • Petrography; Petrogenesis; Granodiorites; Two-Mica Granites; Garga-Sarali.

  • Abstract

    The Garga-Sarali granitoids outcrop from a metamorphic basement in the central-eastern part of the Central Cameroonian Domain of the Central African fold belt in Cameroon, and are petrographically very complex. They can be divided into two types : (1) Granodiorites of metaluminous type-I, with a fine-grained porphyritic variant texture, consisting of quartrz + orthoclase + microcline + plagioclase + biotite + zircon + oxides ± apatite; (2) and two-mica granites of hyper-aluminous type-S, with a grainy texture, consisting of the same quartzo + k-feldspars + biotite + cordierite ± apatite. These formations both belong to a calc-alkaline-subalkaline, hyper-potassic to shoshonitic signature, and to the tectonic domains of volcanic arc granites. Their emplacement is intimately linked to a crustal parent magma (metagrauwackes and metabsalt-tonalites) that imbibed through the openings in the post-orogenic pan-African lithospheric constraints. Their La/Yb ratio, with (La/Sm)n ranging from 2.18-5.75 ppm, reflects their richness in LREE, and the average Eu/Eu*=0.666 ppm suggests that the residual magma was supersaturated with silica.

  • References

    1. Kankeu, B., Greiling, R., O., (2006). Magnetic fabrics (AMS) and transpression in the Neoproterozoic basement of Eastern Cameroon (Garga-Sarali area). Neues Jahrbuch Geologie Paläontologie Abhandlungen 239, https://doi.org/10.1127/njgpa/239/2006/263.
    2. Daama I., Mbowou Gbambie I., B., Yamgouot Ngounouno F., Ntoumbe Mama, Ngounouno I., (2020), Geochemistry of Garga-Sarali intrusive granitoids (central domain of the central African fold belt in Cameroon): petrological implication. International Journal of Ad-vanced Geosciences. June 2020, 8 (1) (2020) 33-40. https://doi.org/10.14419/ijag.v8i1.30559.
    3. Ferre, E., Gleïzes, G., and Caby, R., (2002). Obliquely convergent tectonics and granite emplacement in the trans-Saharan belt of East-ern Nigeria : a synthesis. Precambrian Res. 114, 199e 219. https://doi.org/10.1016/S0301-9268(01)00226-1.
    4. Toteu, S., F., Penaye, J., and Poudjom, D., Y., (2004). Geodynamic evolution of the pan-African Belt in Central Africa with special reference to Cameroon. Canadian Journal of Earth Sciences 41, 73-85. https://doi.org/10.1139/e03-079.
    5. Ngako, V., Jegouzo, p., and Nzenti J., P., (1991). Le Cisaillement Centre Camerounais: rôle structural et géodynamique dans l'oroge-nèse panafricaine. C.R. Académie des sciences paris 313, 457-463. https://scirp.org/reference/referencespapers? referenceid=2077433
    6. Kankeu, B., Greiling, R. O., and Nzenti, J., P, (2009). Pan-African strike-slip tectonics in eastern Cameroon-Magnetic fabrics (AMS) and structure in the Lom basin and its gneissic basement. Precambrian Research 17, 258-272. https://doi.org/10.1016/j.precamres.2009.08.001.
    7. MacDonald G.A. & Katsura T. (1964)-Chemical composition of Hawaiian lavas. J. petrol., 25,713-765. https://doi.org/10.1093/petrology/5.1.82.
    8. Whalen J.B., Currie K.L. & Chappell B.W. (1987)- A-types granites: geochemical characteristics, discrimination and petrogenesis. Con-trib. Mineral. Petrol., 95, 407-419. https://doi.org/10.1007/BF00402202.
    9. Shand, S., J., (1943). Eruptives rocks : their genesis, composition, classification, and their relations to ore-deposits. New York, 444p.
    10. Wolf M. B., and Wyllie J. P., (1994) Dehydration Melting of Amphibolite at 10 Kbar: The Effects of Temperature and Time. Contribu-tion to Mineralogy and Petrology, 115, 369-383. https://doi.org/10.1007/BF00320972.
    11. McDonough, W., F., and Sun, S., S., (1995). The Composition of the Earth. Chemical Geology, 120, 223-253. https://doi.org/10.1016/0009-2541(94)00140-4.
    12. Thiéblemont, D. and Tegyey, M., (1994) Une discrimination géochimique des Roches différenciées témoin de la diversité d’origine et de situation Tectonique des magmas calco-alcalins. Comptes Rendus de l’Académie Des Sciences, 319, 87-94. https://www.scirp.org/reference/referencespapers?referenceid=1535926
    13. Pearce, J., A., Harris, N., B., W., and Tindle, A., G., (1984). Trace Element Discrimination Diagrams for the Tectonic Interpretation of Granitic Rocks. Journal of Petrology, 25, 956-983. https://doi.org/10.1093/petrology/25.4.956.
    14. Middlemost EAK (1997) Magmas, Rocks, and Planetary Development. Longman Harlow. 10.4236/ijaa.2011.12009
    15. Le Maître, R., W., Bateman, P., Dudek, A., Keller, J., Lameyre, M., Le Bas, M., J., Sabine, P.A., Schmid, R., Sørensen, H., Streckeisen, A., Woolley, A., R., and Zanettin, B., (1989). A Classification of Igneous Rocks and a Glossary of Terms. Recommendations of the In-ternational Union of Geological Sciences Subcommission on the Systematics of Igneous Rocks. Blackwell Scientific Publications, Ox-ford. p.193. https://www.researchgate.net/publication/234448684
    16. Haïmeur, J., El Amrani El Hassani, I-E., et Chabane, A., (2004). Pétrologie et géochimie des granitoïdes calco-alcalins de Zaër (Maroc central) : modèle pétrogénétique. Bulletin de l’Institut Scientifique, Rabat, section Sciences de la Terre, n° 2004, n°26, 27-48. 10.4236/nr.2015.611050
    17. Nomo, N., E., Tchameni, R., Vanderhaeges O., N., Barbey P., Fosso, P., and Wambo J., (2017). Petrography and Geochemistry of the Mbip Granitic Massif, SW Tcholliré (Central North Cameroon): Petrogenetic and Geodynamic Implication. International Journal of Geosciences, 6, 761-775. 10.4236/ijg.2015.67062
    18. Naimou, S., Alexandre, Ganwa, A., A., Klötzli, U., Kepnamou, A., D., and Emmanuel, E., G., (2014). Petrography and Geochemistry of Precambrian Basement Straddling the Cameroon-Chad Border: The Touboro Baïbokoum Area. International Journal of Geosciences, 5, 418-431. https://doi.org/10.4236/ijg.2014.54040.
    19. Harker, A., (1909). The natural history of igneous. rocks. New York : Macimillan. https://www.biblio.com/book/natural-history-igneous-rocks-harker alfred/d/1424714331. https://doi.org/10.2307/1777000.
    20. Nédélec, A., and Bouchez, J., L., (2011). Pétrologie des granites. Vuibert and Société géologique de France Editors, 306 p. See discus-sions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/317012801
    21. Vielzeuf D. & Montel J.M. (1994) – Partial melting of metagrauwackes : fluid-absent experiments and phase relationships. Contrib. Mineral. Petrol., 117, 375-393. https://doi.org/10.1007/BF00307272.
    22. Chappell, B., W., et White, A., J., R., (1974). Two contrasting granites types. Pacific Geology, 8 : 173-174. 10.4236/gep.2021.910002
    23. Loiselle M.C Wones D.R. (1979) – Characteristics and origin of anorogenic granites. Geol. Soc. Am. Abstracs, 11, 468. 10.4236/jss.2015.34012
    24. Jonin, M., (1981). Un batholite fini-précambrien : Le batholite mancellien (massif armoricain, France). Thèse, Brest : 320P. https://www.persee.fr/doc/sgeol_0302-2692_1991_num_44_1_1865
    25. Eby, G., N. (1990) - the A-type granitoids: a review of their occurrence and chemical characteristics and speculations on their petro-genesis: https://www.sciencedirect. com/science/article/abs/pii/002449379090043Z.
    26. Mbowou, G., I., B., Lagmet, C., Nomadé, S., Ngounouno, I., Déruelle, B., Ohnenstettter, D. (2012) – Petrology of the late cretaceous peralkaline rhyolites (pantellerite and comendite) from lake Chad, Central Africa. Journal of Geoscience, 57 (2012), https://doi.org/10.3190/jgeosci.118.
    27. Oukemeni Driss, Géochimie, géochronologie (U-Pb) du pluton d'Aouli et comparaisons géochimiques avec d'autres granitoïdes hercy-niens du Maroc par analyse discriminante. Thèse de Doctorat en ressources minérales. Décembre 1993, 141 P. https://doi.org/10.1522/1498481

  • Downloads

  • How to Cite

    Isaac , D. ., Gbambie Isaac Bertrand , M. ., Dagwaï , N. ., & Ismaïla , N. . (2024). Petrogenesis of metaluminous and peraluminous granitoids from Garga-Sarali zone : evidence of I- and S-type sources (central African fold belt in Cameroon). International Journal of Advanced Geosciences, 12(1), 47-55. https://doi.org/10.14419/gd4zjr47