New Constraints from Pb-Evaporation Zircon Ages of the Méiganga Amphibole-Biotite Gneiss, Central Cameroon, on Proterozoic Crustal Evolution — Oak Academic Publishing
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New Constraints from Pb-Evaporation Zircon Ages of the Méiganga Amphibole-Biotite Gneiss, Central Cameroon, on Proterozoic Crustal Evolution
The amphibole biotite gneiss (ABGn) in the Méiganga area forms part of a meta volcano-sedimentary sequence of the Adamawa Yade domain (AYD), Central African Fold Belt (CAFB). This sequence shows affinity with immature sediments (greywackes, arkoses) with intercalation of mafic lavas or tuffs. New 207Pb/206Pb zircon evaporation ages for two ABGn samples range from 1887 - 2339 Ma and from 675 - 889 Ma, respectively. These ages and evidence from internal zircon structures indicate that igneous rocks of Archean to Paleoproterozoic and of early Neoproterozoic age contributed to the detritus of the sedimentary sequence. The deposition of detritus took place prior to 614 - 619 Ma which represent the syntectonic emplacement of the Méiganga metadiorite. Leucogranites north to the Méiganga area were generated by melting of crust identical to that which provided the source of the ABGn. The metasedimentary sequence investigated in this study is similar to that of the southern part of the AYD and in the Borborema Province, NE Brazil. The tectonic and geochronologic characteristics of the AYD in the Méiganga area support the idea that during the Proterozoic, Central Africa and NE Brazil were part of the same continental landmass.
KeywordsMetasediment207Pb/206Pb AgesCrustal EvolutionAdamawa Yade DomainCentral African Fold Belt
S. F. Toteu, J. Penaye and Y. P. Djomani, “Geodynamic Evolution of the Pan-African Belt in Central Africa with Special Reference to Cameroon,” Canadian Journal of Earth Sciences, Vol. 41, No. 1, January 2004, pp. 73-85. doi:10.1139/e03-079
R. Tchameni, A. Pouclet, J. Penaye, A. A. Ganwa and S. F. Toteu, “Petrography and Geochemistry of the Ngao- undéré Pan-African Granitoids in Central North Came- roon: Implications for Their Sources and Geological Set- ting,” Journal of African Earth Sciences, Vol. 44, No. 4-5, April 2006, pp. 511-529. doi:10.1016/j.jafrearsci.2005.11.017
A. A. Ganwa, “Les Granito?des de Méiganga: Etude Pé- trographique, Géochimique, Structurale et Géochronolo- gique. Leur Place Dans la Cha?ne Panafricaine,” Thèse d’état ès Sciences Naturelles, PH.D. Thesis, University of Yaounde 1, Yaoundé, 2005.
G. Noizet, “Disposition Géologique des Régions de Yaoundé et Bafia,” Annales de la Faculté des Sciences, Yaoundé, 1982.
J. Tchakounté, “Etude Géologique de la Région d’Etoun- dou-Bayomen Dans la Série Métamorphique de Bafia: Tectonique, Géochimie, Métamorphisme,” Thèse 3ème Cycle, PH.D. Thesis, University of Yaoundé I, Yaoundé, 1999.
T. Ngnotué, “Pétrogenèse des Formations Métamor- phiques de Ntui-Bétamba, Segment de la Cha??ne Pana- fricaine Nord Equatoriale,” Ph.D. dissertation, University of Cocody, Abidjan, 1997.
A. A. Ganwa, “Contribution à l’étude Géologique de la Région de Kombé II–Mayabo Dans la Série Panafricaine de Bafia : Géomorphologie Structurale, Tectonique, Pét- rologie,”Thèse de 3e Cycle, PH.D. Thesis, University of Yaoundé 1, Yaounde, 1998.
E. T. Njiosseu, J. Nzenti, T. Njanko, B. Kapajika and A. Nédélec, “New UPb Zircon Ages from Tonga (Came- roon): Coexisting Eburnean–Transamazonian (2.1 Ga) and Pan-African (0.6 Ga) Imprints,” Comptes Rendus Geosci- ences, Vol. 337, No. 6, March 2005, pp. 551-562. doi:10.1016/j.crte.2005.02.005
J. T. Numbem, et al., “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 Geosciences, Vol. 339, January 2007, pp. 132-142.
A. A. Ganwa, W. Frisch, W. Siebel, G. E. Ekodeck, C. K. Shang, J. M. Ondoa, M. Satir and J. T. Numbem, “Zircon 207Pb/206Pb Evaporation Ages of Panafrican Meta- sedimentary Rocks in the Kombé-II Area (Bafia Group, Cameroon): Constraints on Protolith Age and Provenan- ce,” Journal of African Earth Sciences, Vol. 51, No. 2, May 2008, pp. 77-88. doi:10.1016/j.jafrearsci.2007.12.003
R. Caby, A. N. Sial, M. H. Arthaud and A. Vauchez, “Cr- ustal Evolution and the Brasiliano Orogeny in Northeast Brazil,” In: R. D. Dallmeyer and J. P. Lécorché, Eds., The West African Orogens and Circum-Atlantic Correlatives, Springer, Berlin, 1991, pp. 373-397.
C. Castaing, J. L. Feybesse, D. Thiéblemont, C. Triboulet and P. Chèvremont, “Paleogeographical Reconstructions of the Pan-African/Brasiliano Orogen: Closure of an Oce- anic Domain or Intracontinental Convergence between Major Blocks?” Precambrian Research, Vol. 69, No. 1-4, October 1994, pp. 327-344. doi:10.1016/0301-9268(94)90095-7
R. Trompette, “Neoproterozoic (~600 Ma) Aggregation of Western Gondwana: A Tentative Scenario,” Precam- brian Research, Vol. 82, No. 1-2, March 1997, pp. 101- 112. doi:10.1016/S0301-9268(96)00045-9
A. A. Ganwa, W. Frisch, W. Siebel and C. K. Shang, “Geochemistry of Magmatic Rocks and Time Constraints on Deformational Phases and Shear Zone Slip in the Méiganga Area, Central Cameroon,” International Geo- logy Review, Vol. 53, No. 7, 2011, pp. 759-784. doi:10.1080/00206810903211161
B. Kober, “Whole Grain Evaporation for 207Pb/206Pb- -Age-Investigations on Single Zircons Using a Double- -Filament Thermal Ion Source,” Contribution to Minera- logy and Petrology, Vol. 93, No. 4, 1986, pp. 482-490. doi:10.1007/BF00371718
B. Kober, “Single Zircon Evaporation Combined with Pb+ Emitter Bedding for 207Pb/206Pb-Age Investigations Using Thermal Ion Mass Spectrometry, and Implications in Zirconology,” Contribution to Mineralogy and Petro- logy, Vol. 96, No. 1, 1987, pp. 63-71. doi:10.1007/BF00375526
A. A. Ganwa, W. Frisch, W. Siebel, G. E. Ekodeck, C. K. Shang and V. Ngako, “Archean Inheritances in the Pyro- xene-Amphibole-Bearing Gneiss of the Méiganga Area (Central North Cameroon): Geochemical and 207Pb/206Pb Age Imprints,” Comptes Rendus Geosciences, Vol. 340, No. 4, April 2008, pp. 211-222. doi:10.1016/j.crte.2007.12.009
H. de la Roche, “Sur l’existence de Plusieurs Faciès Gé- ochimiques Dans Les Schistes Paléozo?ques Des Pyré- nées Luchonnaises,” Geologie Rundschau, Vol. 55, 1965, pp. 274-301.
A. E. P. Douce, “What Do Experiments Tell Us about the Relative Contribution of Crust and Mantle to the Origin of Granitic Magmas?” In: A. Castro, C. Fernandez and J. L. Vigneresse, Eds., Understanding Granites: Integrating New and Classical Techniques, Geological Society Lon- don, London, 1999, pp. 55-75.
R. Altherr, F. Henjes-Kunst, C. Langer and J. Otto, “In- teraction between Crustal-Derived Felsic and Mantle- -Derived Mafic Magmas in the Oberkirch Pluton (Eu- ropean Variscides, Schwarzwald, Germany),” Contribu- tion to Mineralogy and Petrology, Vol. 137, 1999, pp. 304-322
G. Vavra, “On the Kinematics of Zircon Growth and Its Petrogenetic Significance: A Cathodoluminescence Study,” Contribution to Mineralogy and Petrology, Vol. 106, No. 1, 1990, pp. 90-99. doi:10.1007/BF00306410
R. T. Pidgeon, “Recrystallisation of Oscillatory Zoned Zircon: Some Geochronological and Petrological Impli- cations,” Contribution to Mineralogy and Petrology, Vol. 110, No. 4, 1992, pp. 463-472. doi:10.1007/BF00344081
F. Corfu, J. M. Hanchar, P. W. O. Hoskin and P. Kinny, “Atlas of Zircon Textures,” Reviews in Mineralogy & Geochemistry, Vol. 53, No. 1, 2003, pp. 469-500. doi:10.2113/0530469
I. S. William and S. Claesson, “Isotopic Evidence for the Precambrian Provenance and Caledonian Metamorphism of High-Grade Paragneiss from the Seve Nappes, Scandi- navian Caledonides,” Contribution to Mineralogy and Petrology, Vol. 97, No. 2, 1987, pp. 205-217. doi:10.1007/BF00371240
I. de P. Guimar?es, et al., “Trans-Alkaline Magmatism in the Serrinha–Pedro Velho Complex, Borborema Province, NE Brazil and Its Correlations with the Magmatism in Eastern Nigeria,” Gondwana Research, Vol. 15, No. 1, February 2009, pp. 98-110. doi:10.1016/j.gr.2008.06.011
V. C. Medeiros, “Evolu??o Geodinamica e Condiciona- mento Estrutural dos Terrenos Piancó-Alto Brígida e Alto Pajeù, Domínio da Zona Transversal, NE do Brasil,” Ph.D. Thesis, Universidade Federal do Rio Grande do Norte, 2004.
M. Kozuch, “Isotopic and Trace Element Geochemistry of Early Neoproterozoic Gneissic and Metavolcanic Rocks in the Cariris Velhos Orogen of the Borborema Province, Brazil, and Their Bearing on Tectonic Setting,” Ph.D. Thesis, University of Kansas, Natal, 2003.
L. C. Silva, N. J. McNaughton, A. L. Vasconcelos, J. C. R. Gomes and I. R. Fletcher, “U–Pb SHRIMP Ages in Southern State of Ceará, Borborema Province, Brazil: Ar- chean TTG Accretion and Proterozoic Crustal Rework- ing,” Proceedings of the 2nd International Symposium on Granites and Associated Mineralization, Salvador, 24-29 August 1997, pp. 280-281.
B. B. B. Neves, M. C. C. Neto, W. R. V. Schmus, T. M. G. Fernandes and S. L. Souza, “O Terreno AltoMoxotó o no Leste da Para?ba (Maci?o Calda Brabd?o),” Revista Brasileira de Geosciências, Vol. 31, 2001, pp. 185-194.
S. P. Neves, O. Bruguier, A. Vauchez, D. Bosch, J. M. R. Silva and G. Mariano, “Timing of Crust Formation, De- position of Supracrustal Sequences, and Transamazonian and Brasiliano Metamorphism in the East Pernambuco Belt (Borborema Province, NE Brazil): Implications for Western Gondwana Assembly,” Precambrian Research, Vol. 149, No. 3-4, September 2006, pp. 197- 216. doi:10.1016/j.precamres.2006.06.005
W. R. V. Schmus, et al., “U/Pb and Sm/Nd Geochro- nologic Studies of the Eastern Borborema Province, Nor- theastern Brazil: Initial Conclusions,” Journal of South American Earth Sciences, Vol. 8, No. 3-4, 1995, pp. 267- 288. doi:10.1016/0895-9811(95)00013-6
O. O. Melo, I. P. Guimar?es, A. Fetter and H. Beurlen, “Idades U/Pb em Zirc?o e Idades Modelo (Sm/Nd) de Ortognaisses e Enclaves Metamórficos da área de Barro- Vermelho-PE, Terreno Alto Moxotó, Província Borbo- rema, Nordeste do Brasil,” Revista Brasileira de Geo- ciências, Vol. 32, 2002, pp. 197-204.
V. P. Ferreira, A. N. Sial and E. F. Jardim de S′a, “Geo- chemical and Isotopic Signatures of Proterozoic Gra- nitoids in Terranes of the Borborema Structural Province, Northeastern Brazil,” Journal of South American Earth Sciences, Vol. 11, No. 5, 1998, pp. 439-455. doi:10.1016/S0895-9811(98)00027-3
G. Mariano, S. P. Neves, A. D. S. Filho and I. P. Guima- r?es, “Diorites of the High-K Calc-Alkalic Association: Geochemistry and Sm–Nd Data and Implications for the Evolution of the Borborema Province, Northeast Brazil,” International Geology Review, Vol. 43, No. 10, 2001, pp. 921-929. doi:10.1080/00206810109465056
I. P. Guimar?es and B. B. B. Neves, “Geochemistry Characterization of Part of the Early Neoproterozoic plu- tonism in the Central Structural Domain of the Bor- borema Province, NE Brazil,” Proceedings of the 32nd International Geological Congress, Firenze, 20-28 Aug- ust 2004.