The tectonic evolution and provenance of the sediments from the Yaoundé Group remain poorly understood and somewhat enigmatic although the information it has already provided. This work presents the results of integrated field mapping, petrography and whole-rock geochemical studies of less documented metasedimentary rocks cropping in the southwestern portion of the Yaoundé Group, with the aim to enhance the geological setting of this group. These metasedimentary rocks comprise garnet-bearing chlorite schists, garnet micaschists and kyanite-bearing garnet migmatites. Their mineral assemblages suggest prograde metamorphism, from greenschist to granulite through amphibolite facies. Whole-rock geochemical data reveals wide range of Fe2O3 + MgO + TiO2 contents, from 7.3 to 32.6 wt.%, due to the diversity of lithological units. High Ba (616.833 ppm), V (145.333 ppm) and Zr (227.591 ppm) values suggest continental crust source materials. The average ratios of Nb/Ta (15.25), Zr/Hf (36.52) and Y/Ho (27.41) are closer to those of the upper continental crust. The average Th/U ratio, above 4.0 in investigated metasedimentary rocks, indicates intense weathering in the source areas or sediment recycling. The protoliths of the rocks are post-Archean shales and greywackes deriving mostly from andesites and granodiorites, probably from of the Congo craton and/or the Adamawa-Yadé block. The prominent tholeiitic geochemical affinity of these rocks suggests their emplacement in an active margin context and/or oceanic island arc setting.
| Published in | Earth Sciences (Volume 11, Issue 5) |
| DOI | 10.11648/j.earth.20221105.11 |
| Page(s) | 232-249 |
| 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), 2022. Published by Science Publishing Group |
Yaoundé Group, Metasedimentary Rocks, Upper Continental Crust, Active Margin, Congo Craton
| [1] | Attoh, K., Dalmayer, R. D., Affaton, P., 1997. Chronology of nappe assembly in the Pan African Dahomeyide Orogen, West Africa: Evidence from 40Ar/39Ar mineral ages. Precambrian Research 82, 153-171. |
| [2] | Bailey, J. C., 1981. Geochemical criteria for a refined tectonic discrimination of orogenic andesites. Chemical Geology 32, 139-154. |
| [3] | Barbey, P., Macaudiere, J., Nzenti, J. P., 1990. High pressure dehydration melting of metapelites: evidence from the migmatites of Yaoundé (Cameroon). Journal of Petrology 31, 401-427. |
| [4] | Basu, H., Dandele, P. S., Kumar, K. R., Achar, K. K., Umamaheswar, K., 2017. Geochemistry of black shales from the Mesoproterozoic Srisailam Formation, Cuddapah basin, India: Implications for provenance, palaeoweathering, tectonics, and timing of Col umbia breakup. Geochemistry 77, 596-61. |
| [5] | Betsi, B. T., Ngo, B. B. L. M., Mvondo, H., Nga, M. Y. L. N., Molotouala, A. C., McFarlane, C., 2020. Rutile LA-ICP-MS U-Pb geochronology and implications for tectono-metamorphic evolution in the Yaoundé Group of the Neoproterozoic Central African Orogeny. Journal of African Earth Sciences 171, 103939. |
| [6] | Bhatia, M. R., Crook, K. A. W. W., 1986. Trace element characteristics of graywackes and tectonic setting discrimination of sedimentary basins. Contributions to Mineralogy and Petrology 92, 181-193. |
| [7] | Bhatia, M. R., 1983. Plate tectonics and geochemical composition of sandstones. J Geol 91, 611-627. |
| [8] | Bouyo Houketchang, M., Penaye, J., Barbey, P., Toteu, S. F., Wandji, P., 2013. Petrology of high-pressure granulite facies metapelites and metabasites from Tcholliré and Banyo regions: Geodynamic implication for the Central African Fold Belt (CAFB) of north- central Cameroon. Precambrian Research 224, 412-433. |
| [9] | Bouyo Houketchang, M., Zhaa, Penaye, J., Zhang, S. H., Njel, U. O., 2015. Neoproterozoic subduction-related metavolcanic and metasedimentary rocks from the Rey Bouba Greenstone Belt of north-central Cameroon in the central African Fold Belt: New insights into a continental arc geodynamic setting. Precambrian research 261, 40-53. |
| [10] | Caby, R., Boessé, J. M., 2001. Pan-African nappe system in southwest Nigeria: the Ife-IIesha schist belt. Journal of African Earth Sciences 33, 211-225. |
| [11] | Champetier de Ribes, G., Aubague, M., 1956. Geological reconnaissance map at 1:500,000, explanatory note on the Yaounde East sheet. Direction of Mining and Geology, Yaounde, Cameroun. Rebon Printing company, Paris, France. |
| [12] | Chattopadhyay, A., Huin, A. K., Khan, A. S., 2002. Structural Framework of Deolapar Area, Central India and its Implications for Proterozoic Nappe Tectonics. Gondwana Research 6, 107-117. |
| [13] | Condie, K. C., 1993. Chemical composition and evolution of the upper continental crust: Contrasting results from surface samples and shales. Chemical Geology 104, 1-37. |
| [14] | De la Roche, H., 1965. On the existence of several geochemical facies in the Palaeozoic shales of the Luchonian Pyrenees. Geologische Rundschau 55, 274-301. |
| [15] | D'el-Rey Silva, L. J. H, 1995. Tectonic evolution of the Sergipano Belt, NE Brazil. Revisia Brasileira de Geociencias 25, 345-332. |
| [16] | D'el-Rey Silva, L. J. H, 1999. Basin infilling in the southern-central part of the Sergipano Belt (NE Brazil) and implications for the evolution of Pan-African/Brasiliano cratons and Neoproterozoic sedimentary cover. Journal South American Earth Sciences 12, 453-470. |
| [17] | Ewart, A., 1976. Mineralogy and chemistry of modern orogenic lavas. Some statistics and implications. Earth and Planetary Sciences Letters, 31, pp. 417-432. |
| [18] | Fedo, C. M., Nesbitt, H. W., Young, G. M., 1995. Unraveling the effects of potassium metasomatism in the sedimentary rocks and paleosols with implications for paleoweathering conditions and provenance. Geology 23, 921-924. |
| [19] | Feybesse, J. L., Billa, M., Diaby, S., Diallo, S., Egal, E., Le Metour, J., Lescuyer, J. L., Sylla, B. I., Villeneuve, M., 2004. Explanatory note of the Geological and Gitological Map at 1/500 000 of Guinea BRGM, DNRGH 60 p. Conakry (GIN). |
| [20] | Fuh, C. G., Nkoumbou, C., Tchakounte Numbem, J., Mukete, K. O., Tchouankoue, J. P., 2021. Petrology, geochemistry, Ar-Ar isotopes of an arc related calk-alkaline pluton from Mamb (Pan-African Yaoundé Group, Cameroon): A testimony to the subduction of a hot oceanic crust. Lithos 384-385, 105973. |
| [21] | Ganwa, A. A., Frisch, W., Siebel, W., Ekodeck, G. E., Cosmas, S. K., Ngako, V., 2008. Archean inheritances in the pyroxene-amphibole-bearing gneiss of the Méiganga area (Central North Cameroon): Geochemical and 207Pb/206Pb age imprints. Comptes Rendus Géoscience 340, 211-222. |
| [22] | Ganwa, A. A., Klötzli, U. S., Christoph, H., 2016. Evidence for Archean inheritance in the pre-panafrican crust of central Cameroun: Insight from Zircon Internal Structure and La-Mc ICP-MS U/Pb ages. Journal of African Earth Sciences 120, 12-22. |
| [23] | Ganwa, A. A., Klötzli, U. S., Kepnamou Diguim, A., Hauzenberger, C., 2018. Multiple Ediacaran tectono-metamorphic events in the Adamawa-Yade Domain of the Central Africa Fold Belt: Insight from the zircon U-Pb LAM-ICP-MS geochronology of the metadiorite of Meiganga (Central Cameroon). Geological Journal 53, 2955-2968. |
| [24] | Goldschimdt, V. M., 1954. Geochemistry. Clarendon Press, Oxford. |
| [25] | Goussi Ngalamo, J. F. G., Bisso, D., Abdelsalam, M. G., Atekwana, E. A., Katumwehe, A. B., Ekodeck, G. E., 2017. Geophysical imaging of metacratonizaton in the northern edge of the Congo craton in Cameroon. Journal of African Earth Sciences 129, 94-107. |
| [26] | Goussi Ngalamo, J. F. G., Sobh, M., Bisso, D., Abdelsalam, M. G., Atekwana, E., Ekodeck G. E., 2018. Lithospheric structure beneath the Central African Orogenic Belt in Cameroon from the analysis of satellite gravity and passive seismic data. Tectonophysics 745, 326-337. |
| [27] | Gromet, L. P., Haskin, L. A., Korotev, R. L., Dymek, R. F., 1984. The “North American shale composite”: Its compilation, major and trace element characteristics. Geochimica et Cosmochimica Acta 48, 2469-2482. |
| [28] | Herron, M. M., 1988. Geochemical classification of terrigenous sands and shales from core or log data. Journal of Sedimentary Petrology 58, 820-892. |
| [29] | Johnson, R. W., Mackenzie, D. E., Smith, I. E. M., 1978. Volcanic rock associations at convergent plate boundaries: reappraisal of the concept using case histories from Papua-New Guinea. Geol. Soc. America Bull 89, pp. 96-106. |
| [30] | Joshi, K. B., Ray, S., Ahmad, T., Manavalan, S., Aradhi, K. K., 2021. Geochemistry of meta-sediments from Neoproterozoic Shimla and Chail Groups of Outer Lesser Himalaya: Implications for provenance, tectonic setting, and paleo-weathering conditions. Geological Journal 56, 4451-4478. |
| [31] | Kwékam, M., Talla, V., Fozing, E. M., Kouémo, T. J., Dunkl, I.; Njonfang E., 2020. The Pan-African High-K I-Type Granites from Batié Complex, West Cameroon: Age, Origin, and Tectonic Implications. Frontiers in Earth Sciences 8, 383. |
| [32] | Lima, H. M., Pimentel, M. M., Fuck, R. A., Santos, L. C. M. L., Dantas, E. L., 2018. Geochemical and detrital zircon geochronological investigation of the metavolcanosedimentary Araticum complex, Sergipano fold belt: Implications for the evolution of the Borborema Province, NE Brazil. Journal of South American Earth Sciences 86, 176-192. |
| [33] | Lima, H. M., Santos, L. C. M. L., Argollo, R. M., Santos, E. J., 2020. Geological and structural markers of the eastern Borborema Province based on a geotransect covering the Paraíba, Pernambuco, Alagoas and Sergipe states, northeastern Brazil. Journal of the Geological Survey of Brazil 3, 85-95. |
| [34] | Lima, M. M. C., Silva, T. R., Ferreira, V. P., Silva, J. M. R., 2014. Metasedimentary rocks of the northern portion of the Macururé domain, Sergipano Belt, northeastern Brazil: geochemical characterization of their protoliths and tectonic implications. Estudos Geológicos 24, 89-107. |
| [35] | Liu, J., Zhu, Z., Xiang, R., Cao, L., He, W., Liu, S., Shi, X., 2019. Geochemistry of core sediments along the Active Channel, northeastern Indian Ocean over the past 50,000 years: Sources and climatic implications. Palaeogeography, Palaeoclimatology, Palaeoecology 521, 151-160. |
| [36] | McDonough and Sun., 1995. The composition of earth. Chemical Geology 120: 223-253. |
| [37] | McLennan, S. M., Hemming, S., McDaniel, D. K., Hanson, G. N., 1993. Geochemical approaches to sedimentation, provenance, and tectonics. In: Special Papers-Geological Society of America 284, 21-40. |
| [38] | Metang, V., Nomo, N. E, Ganno, S; Takodjou, W. J. D., Teme, M. A. E; Teda, S. A. C., Fossi. D. H., Mbakam, N. M. D., Tchameni, R., Nkoumbou, C., Nzenti, J. P., 2022. Anatexis of metadiorite from the Yaoundé area, Central African Orogenic Belt in Cameroon: implications on the genesis of in-source granodiorite leucosomes. Arabian Journal of geosciences 15, 359. |
| [39] | Migdisov, A. A., 1960. On the titanium/aluminium ratio in sedimentary rocks. Geochemistry USSR. (English transl) 2, 178-194. |
| [40] | Miyashiro, A., 1974. Volcanic rock series in island arcs and active continental margins. American Journal of Science 274, 321-355. |
| [41] | Mukete, K. O., Minyem, D., Tamen, J., Nkoumbou. C., Fuh, C. G., Tchakounté Numbem, J. 2022. Petrology of ophiolites of Memel, Nsimè-Kellé and Mapan (Yaoundé group): Evidence of the geodynamic evolution of the Pan-African orogeny in South Cameroon. Journal of African Earth Sciences 191, 104537. |
| [42] | Mvondo, H., Owona, S., Mvondo, O. J., Essono, J., 2007. Tectonic evolution of the Yaoundé segment of the Neoproterozoic Central African Orogenic Belt in Southern Cameroon. Canadian Journal of Earth Science 44 (4), 433-444. |
| [43] | Nédélec, A., Macaudière, J., Nzenti, J. P., Barbey, P., 1986. Structural and metamorphic evolution of the Mbalmayo schists (Cameroon): implications for the structure of the Pan-African mobile belt of Central Africa, close of the Congo craton. Comptes Rendus de l'Academie des Sciences de Paris, Tome 303 (Series II): 75-80. |
| [44] | Nesbitt, H., Young, G., 1984. Prediction of some weathering trends of plutonic and volcanic rocks based on thermodynamic and kinetic consideration. Geochimica Cosmochimica Acta 48, 1523-1534. |
| [45] | Ngako, V., Njonfang, E., 2011. In: Damien Closson, Dr (Ed.), Plates Amalgamation and Plate Destruction, the Western Gondwana History. Tectonics. InTech 978-953-307545-7. |
| [46] | Ngamy Kamwa, A., Tchakounte Numbem, J., Nkoumbou, C., Owona, S., Tchouankoue, J. P., Mvondo Ondoa, J., 2019. Petrology and geochemistry of the Yoro-Yangben Pan-African granitoids intrusion in the Archean Adamawa-Yade crust (Sw-Bafia, Cameroon). Journal of African Earth Sciences 150, 401-414. |
| [47] | Ngnotué, T., Ganno, S., Nzenti, J. P., Schulz, B., Tchaptchet Tchato, D., Suh Cheo, E., 2012. Geochemistry and geochronology of Peraluminous High-K granitic leucosomes of Yaoundé series (Cameroon): evidence for a unique Pan-African magmatism and melting event in North Equatorial Fold Belt. International Journal of Geosciences 3, 525-548. |
| [48] | Ngnotué, T., Nzenti, J. P., Barbey, P., Tchoua, F. M., 2000. The Ntui-Betamba high grade gneisses: A Northward extension of the Pan-African Yaoundé gneisses in Cameroon. Journal of African Earth Sciences 31, 369-381. |
| [49] | Ngo Bidjeck, B. L. M., Betsi, B. T., Nga, M. Y. N. L., Belnoun, N. R. N., Molotouala, A. C., McFarlane, C., Bitom D. L., 2020. Geochemistry of rutile from the Pan-African Yaoundé metamorphic group: Implications for provenance and conditions of formation. Journal of African Earth Sciences 170, 103912. |
| [50] | Nkoumbou, C., Barbey, P., Yonta-Ngouné, C., Paquette, J. L., Villiéras, D. F., 2014. Precollisional geodynamic context of the southern margin of the Pan-African fold belt in Cameroon. Journal of African Earth Sciences 99, 245-260. |
| [51] | Nkoumbou, C., Yonta-Ngoune, C., Villiéras, F., Njopwouo, D., Yvon, J., Ekodeck, G. E., Tchoua, F., 2006. Discovery of ophiolite-related rocks in the Pan-African belt in Cameroon: Talc schists from Ngoung, Lamal Pougue, and Bibodi Lamal. Comptes Rendus Geoscience 338, 1167-1175. |
| [52] | Nzenti, J. P., Barbey, P., Macaudière, J., Soba, D., 1988. Origin and evolution of the late Precambrian high-grade Yaoundé gneisses (Cameroon). Precambrian Research 38, 91-109. |
| [53] | Olinga, J. B., Minyem, D., Mpesse, J. E., Ekodeck, G. E., 2010. Deformation history of Yaoundé Group in the Awae-Ayos area (Southern-Cameroon): Evidence for Pan-African thrust tectonics. Journal of the Cameroun Academy of Sciences 9 (1). |
| [54] | Oliveira, E. P., Toteu, S. F., Araújo, M. N. C., Carvalho, M. J., Nascimento, R. S., Bueno, J. F., McNaughton, N., Basilici, G., 2006. Geologic correlation between the Neoproterozoic Sergipano Belt (NE Brazil) and the Yaoundé Belt (Cameroon, Africa). Journal of African Earth Sciences 44, 470-478. |
| [55] | Oliveira, E. P., Windley, B. F., Araújo, M. N. C., 2010. The Neoproterozoic Sergipano orogenic belt, NE Brazil: A complete plate tectonic cycle in western Gondwana. Precambrian Research 181, 64-84. |
| [56] | Oliveira, E. P., Windley, B. F., McNaughton, N. J., Bueno, J. F., Nascimento, R. S., Carvalho, M. J., Araujo, M. C., 2017. The Sergipano Belt. M. Heilbron et al. (eds.), São Francisco Craton, Eastern Brazil, Regional Geology Reviews 13, 241-254. |
| [57] | Owona, S., Mvondo Ondoa, J., Ratschbacher, L., Ndzana, M. P. S., Tchoua, F. M., Ekodeck, G. E., 2011b. The geometry of the Archean, Paleo- and Neoproterozoic tectonics in the Southwest Cameroon. Comptes Rendus Geosciences 343, 312-322. |
| [58] | Owona, S., Ratschbacher, L., Nsangou N. M., Muhammad, G. A., Mvondo Ondoa, J., Ekodeck G. E., 2021. How diverse is the source? Age, provenance, reworking, and overprint of Precambrian meta-sedimentary rocks of West Gondwana, Cameroon, from zircon U-Pb geochronology. Precambrian Research 359, 106220. |
| [59] | Owona, S., Schulz, B., Ratschbacher, L., Mvondo Ondoa, J., Ekodeck, G. E., Tchoua, M. F., Affaton, P., 2011a. Pan-African metamorphic evolution in the Southern Yaoundé Group (Oubanguide Complex, Cameroon) as revealed by EMP-Monazite dating and thermobarometry and garnet metapelites. Journal of African Earth Sciences 59, 125-139. |
| [60] | Penaye, J., 1988. Petrology and Structure of the Metamorphic Ensembles of South-East Poli (North Cameroon). Ph. D. thesis, INPL, Nancy, Unpublished. |
| [61] | Penaye, J., Kröner, A., Toteu, S. F., Van Schmus, W. R., Doumnang, J. C., 2006. Evolution of the Mayo Kebbi region as revealed by zircon dating: An early (ca. 740 Ma) Pan-African magmatic arc in southwestern Chad. Journal African Earth Sciences 44, 530-542. |
| [62] | Pin, C., Poidevin, J. L., 1987. U-Pb zircon evidence for a Pan-African granulite facies metamorphism in the Central African Republic. A new interpretation of high-grade series of the northern border of the Congo craton. Precambrian Research 36, 303-312. |
| [63] | Roddaz, M., Debat, P., Nikiéma, S., 2007. Geochemistry of Upper Birimian sediments (major and trace elements and Nd-Sr isotopes) and implications for weathering and tectonic setting of the Late Paleoproterozoic crust. Precambrian Research. 159, 197-211. |
| [64] | Ronov, A. B., Migdisov, A. A., 1971. Geochemical history of the crystalline basement and the sedimentary cover of the Russian and North American platform. Sedimentology, 16, pp. 137-185. |
| [65] | Roser, B. P, Korsch, R. J., 1988. Provenance signatures of sandstone-mudstone suites determined using discriminant function analysis of major-element data. Chem Geol 67, 119-139. |
| [66] | Roser, B. P., Korsch, R. J., 1986. Discrimination of tectonic setting of sandstone-mudstone suites using SiO2 content and K2O/Na2O ratio. Journal of Geology 94, 635-650. |
| [67] | Rudnick, R. L., Gao, S., 2013. Composition of the Continental Crust. Treatise on Geochemistry (2nd ed.). Amsterdam: Elsevier. |
| [68] | Saha-Fouotsa, A. N., Vanderhaeghe, O., Barbey, P., Eglinger, A., Tchameni, R., Zeh, A., Tchunte, P. F., Nomo, E. N., 2019. The geologic record of the exhumed root of the Central African Orogenic Belt in the central Cameroon domain (Mbé–Sassa-Mbersi region). Journal of African Earth Sciences 151, 286–314. |
| [69] | Stendal, H., Toteu, S. F., Frei, R., Penaye, J., Njel, U. O., Bassahak, J., Nni, J., Kankeu, B., Ngako, V., Hell, J. V., 2006. Derivation of detrital rutile in the Yaoundé region from the Neoproterozoic Pan-African belt in southern Cameroon (Central Africa). Journal of African Earth Sciences 44, 443-458. |
| [70] | Tarney, J., 1977. Petrology, mineralogy and geochemistry of the Falkland Plateau basement rocks, site 300, Deep Sea Drilling Project. Int. Rep. Deep Sea Drilling Project 36, 893-921. |
| [71] | Taylor, H. P., 1979. Oxygen and hydrogen isotope relationships in hydrothermal mineral deposits. In: Barnes H. L. (Eds.), Geochemistry of hydrothermal ore deposits, 2 edition. Wiley, New York, 236-277. |
| [72] | Taylor, S. R., McLennan, S. M., 1985. The continental crust: Its Composition and Evolution. Blaskwell Science, Oxford. |
| [73] | Tchakounté Numben, J., Toteu, S. F., Van Schmus, W. R., Penaye, J., Deloule, E., Mvondo Ondoua, J., Houketchang, M. B., Ganwa, A. A., White, W. M., 2007. Evidence of ca.1. 6-Ga detrital zircon in the Bafia Group (Cameroon): Implication for the chronostratigraphy of the Pan-African Belt north of the Congo craton. Comptes Rendus Geoscience 339, 132-142. |
| [74] | Tchakounté, J. N., Eglinger, A., Toteu, S. F., Zeh, A., Nkoumbou, C., Mvondo-Ondoa, J., Barbey, P., 2017. The Adamawa-Yade domain, a piece of Archean crust in the Neoproterozoic Central African Orogenic belt (Bafia area, Cameroon). Precambrian Research 299, 210-229. |
| [75] | Toteu S. F, Michard A, Bertrand, J. M., Rocci, G., 1987. U/Pb of Precambrian rock from North-Cameroon, Orogenic evolution and chronology of the Pan-African belt of Central African. Precambrian Research 37, 71-87. |
| [76] | Toteu, S. F., Penaye, J., Deloule, E., Van Schmus, W. R., Tchameni, R., 2006b. Diachronous evolution of volcano-sedimentary basins north of the Congo craton: Insights from U- Pb ion microprobe dating of zircons from the Poli, Lom and Yaoundé Groups (Cameroon). Journal of African Earth Sciences 44, 428-442. |
| [77] | Toteu, S. F., Penaye, J., Djomani Poudjom, H. 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. |
| [78] | Toteu, S. F., Yongue, R. F., Penaye, J., Tchakounte, J., Seme Mouangue, A. C., Van Schmus, W. R., Deloule, E., Stendal, H., 2006a. U-Pb dating of plutonic rocks involved in the nappe tectonic in southern Cameroon: consequence for the Pan-African orogenic evolution of the central African fold belt. Journal of African Earth Sciences 44, 479-493. |
| [79] | Vicat, J. P., Moloto-A-Kenguemba, G., Pouclet, A., 2001. Granitoids of the Proterozoic cover of the Congo craton northern edge (South-East of Cameroon and South-West of the Central African Republic), witnesses of a post-Kibarian to pre-Pan-African magmatic activity Comptes Rendus de l’Academie des Sciences, Paris 332, 235-242. |
| [80] | Vicat, J. P., Pouclet, A., Nkoumbou, C., Sémé Mouangué, A., 1997. The fissural Neoproterozoic volcanism of the lower Dja, Yokadouma (Cameroon) and Nola (RCA) series. Geotectonic meaning. Comptes Rendus de l’Academie des Sciences de Paris 325, 671-677. |
| [81] | Yonta-Ngoune, C., 2010. Geological context of the Boumnyebel talcschists (Cameroun): Inferences on the Pan-African Belt of Central Africa. Ph.D. thesis, University of Yaoundé I: 221 p + annexes. |
| [82] | Yonta-Ngouné, C., Nkoumbou, C., Barbey, P., Le Breton, N., Montel, J. M., Villiéras, F., 2010. Geological context of the Boumnyebel talcschists (Cameroun): Inferences on the Pan-African Belt of Central Africa. Comptes Rendus Geoscience 342, 108-115. |
APA Style
Victor Metang, Bernard Tassongwa, Rose Ngo Belnoun, Henri Appolinaire Kenzo, Myrianne Tawo Toussi, et al. (2022). Petrography and Geochemistry of Metasedimentary Rocks from the Southwestern Portion of the Yaoundé Group in Cameroon: Provenance and Tectonic Implications. Earth Sciences, 11(5), 232-249. https://doi.org/10.11648/j.earth.20221105.11
ACS Style
Victor Metang; Bernard Tassongwa; Rose Ngo Belnoun; Henri Appolinaire Kenzo; Myrianne Tawo Toussi, et al. Petrography and Geochemistry of Metasedimentary Rocks from the Southwestern Portion of the Yaoundé Group in Cameroon: Provenance and Tectonic Implications. Earth Sci. 2022, 11(5), 232-249. doi: 10.11648/j.earth.20221105.11
AMA Style
Victor Metang, Bernard Tassongwa, Rose Ngo Belnoun, Henri Appolinaire Kenzo, Myrianne Tawo Toussi, et al. Petrography and Geochemistry of Metasedimentary Rocks from the Southwestern Portion of the Yaoundé Group in Cameroon: Provenance and Tectonic Implications. Earth Sci. 2022;11(5):232-249. doi: 10.11648/j.earth.20221105.11
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Download@article{10.11648/j.earth.20221105.11,
author = {Victor Metang and Bernard Tassongwa and Rose Ngo Belnoun and Henri Appolinaire Kenzo and Myrianne Tawo Toussi and Diane Marilyn Nkamga Mbakam and Lea Grace Tene Kengne and Legrand Joseph Tchop and Lucas Mouafo and Jean Pierre Tchouankoue},
title = {Petrography and Geochemistry of Metasedimentary Rocks from the Southwestern Portion of the Yaoundé Group in Cameroon: Provenance and Tectonic Implications},
journal = {Earth Sciences},
volume = {11},
number = {5},
pages = {232-249},
doi = {10.11648/j.earth.20221105.11},
url = {https://doi.org/10.11648/j.earth.20221105.11},
eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.earth.20221105.11},
abstract = {The tectonic evolution and provenance of the sediments from the Yaoundé Group remain poorly understood and somewhat enigmatic although the information it has already provided. This work presents the results of integrated field mapping, petrography and whole-rock geochemical studies of less documented metasedimentary rocks cropping in the southwestern portion of the Yaoundé Group, with the aim to enhance the geological setting of this group. These metasedimentary rocks comprise garnet-bearing chlorite schists, garnet micaschists and kyanite-bearing garnet migmatites. Their mineral assemblages suggest prograde metamorphism, from greenschist to granulite through amphibolite facies. Whole-rock geochemical data reveals wide range of Fe2O3 + MgO + TiO2 contents, from 7.3 to 32.6 wt.%, due to the diversity of lithological units. High Ba (616.833 ppm), V (145.333 ppm) and Zr (227.591 ppm) values suggest continental crust source materials. The average ratios of Nb/Ta (15.25), Zr/Hf (36.52) and Y/Ho (27.41) are closer to those of the upper continental crust. The average Th/U ratio, above 4.0 in investigated metasedimentary rocks, indicates intense weathering in the source areas or sediment recycling. The protoliths of the rocks are post-Archean shales and greywackes deriving mostly from andesites and granodiorites, probably from of the Congo craton and/or the Adamawa-Yadé block. The prominent tholeiitic geochemical affinity of these rocks suggests their emplacement in an active margin context and/or oceanic island arc setting.},
year = {2022}
}
TY - JOUR T1 - Petrography and Geochemistry of Metasedimentary Rocks from the Southwestern Portion of the Yaoundé Group in Cameroon: Provenance and Tectonic Implications AU - Victor Metang AU - Bernard Tassongwa AU - Rose Ngo Belnoun AU - Henri Appolinaire Kenzo AU - Myrianne Tawo Toussi AU - Diane Marilyn Nkamga Mbakam AU - Lea Grace Tene Kengne AU - Legrand Joseph Tchop AU - Lucas Mouafo AU - Jean Pierre Tchouankoue Y1 - 2022/09/05 PY - 2022 N1 - https://doi.org/10.11648/j.earth.20221105.11 DO - 10.11648/j.earth.20221105.11 T2 - Earth Sciences JF - Earth Sciences JO - Earth Sciences SP - 232 EP - 249 PB - Science Publishing Group SN - 2328-5982 UR - https://doi.org/10.11648/j.earth.20221105.11 AB - The tectonic evolution and provenance of the sediments from the Yaoundé Group remain poorly understood and somewhat enigmatic although the information it has already provided. This work presents the results of integrated field mapping, petrography and whole-rock geochemical studies of less documented metasedimentary rocks cropping in the southwestern portion of the Yaoundé Group, with the aim to enhance the geological setting of this group. These metasedimentary rocks comprise garnet-bearing chlorite schists, garnet micaschists and kyanite-bearing garnet migmatites. Their mineral assemblages suggest prograde metamorphism, from greenschist to granulite through amphibolite facies. Whole-rock geochemical data reveals wide range of Fe2O3 + MgO + TiO2 contents, from 7.3 to 32.6 wt.%, due to the diversity of lithological units. High Ba (616.833 ppm), V (145.333 ppm) and Zr (227.591 ppm) values suggest continental crust source materials. The average ratios of Nb/Ta (15.25), Zr/Hf (36.52) and Y/Ho (27.41) are closer to those of the upper continental crust. The average Th/U ratio, above 4.0 in investigated metasedimentary rocks, indicates intense weathering in the source areas or sediment recycling. The protoliths of the rocks are post-Archean shales and greywackes deriving mostly from andesites and granodiorites, probably from of the Congo craton and/or the Adamawa-Yadé block. The prominent tholeiitic geochemical affinity of these rocks suggests their emplacement in an active margin context and/or oceanic island arc setting. VL - 11 IS - 5 ER -
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