Petrography and Mineralogy of the Quartz and Quartz-Feldspar Sulphide Veins in the Pan-African Syenitic Massif of Guider (North Cameroon) — Oak Academic Publishing
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Petrography and Mineralogy of the Quartz and Quartz-Feldspar Sulphide Veins in the Pan-African Syenitic Massif of Guider (North Cameroon)
Department of Earth Sciences, Faculty of Science, University of Maroua, Maroua, Cameroon
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Department of Earth Sciences, Faculty of Science, University of Maroua, Maroua, Cameroon
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Department of Earth Sciences, Faculty of Science, University of Ngaoundéré, Ngaoundéré, Cameroon
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Department of Earth Sciences, Faculty of Science, University of Ngaoundéré, Ngaoundéré, Cameroon
1 Department of Earth Sciences, Faculty of Science, University of Maroua, Maroua, Cameroon
2 Department of Earth Sciences, Faculty of Science, University of Maroua, Maroua, Cameroon
3 Department of Earth Sciences, Faculty of Science, University of Ngaoundéré, Ngaoundéré, Cameroon
4 Department of Earth Sciences, Faculty of Science, University of Ngaoundéré, Ngaoundéré, Cameroon
In the syenitic pluton of Guider (593 ± 4 Ma) in the North-West Cameroon domain of Central African Fold Belt, mineralized N-S to NE-SW vertical or sub-vertical quartz and quartz feldspar veins has been recently identified. In this contribution, we present petrography and mineralogy of these veins, in order to constrain their genesis and emplacement mechanisms based on detailed field work, petrographic studies and chemical characterization of minerals by using an electron probe microanalyser (EPMA). Field observations and vein microstructures show that the emplacement of the veins has been controlled by the dextral N-S trending strike-slip shear zones related to the regional D2 deformation phase. The results of mineralogical analysis reveal the co-presence of silicates and metallic minerals that include magnetite, ilmenite, pyrite, bismuthite, galena (very rare) and sulphide complexes (BiPbS, BiAgPbS, FeBiPbCuS, BiFe(TeS), FeBiPbS, BiPbCuS). The gangue is represented by quartz (quartz 1, quartz 2 and quartz 3), feldspars, sericite, chlorite, yellowish brown clay minerals, and hematite. The textural relationships between sulphides, quartz and alteration products show that the mineralization is essentially syn- to late-D2 and suggest that syenitic country rock and dextral shear zones have played an important role in the metallogenesis of these veins. This mineralization shows characteristics for copper-bearing calc-alkaline deposits, but differs from these by its more extensive alteration and its abundance in hematite. Substitutions of Al(IV) by Si(IV) in sericite associated with the sulphide mineralization and cataclastic deformation suggest that the temperature of trapping of the fluids is between 230 ° C and 275 ° C.
KeywordsGuiderPan-African Syenitic IntrusionQuartz and Quartz-Feldspar VeinsSulphide Mineralization
Gerdes, M.L., Baumgartner, L.P. and Person, M. (1998) Convective Fluid Flow through Heterogeneous Country Rocks during Contact Metamorphism. Journal of Geophysical Research: Solid Earth, 103, 23983-24003. https://doi.org/10.1029/98JB02049
Goldfarb, R.J., Groves, D.I. and Gardoll, S. (2001) Orogenic Gold and Geologic Time: A Global Synthesis. Ore Geology Reviews, 18, 1. https://doi.org/10.1016/S0169-1368(01)00016-6
Thompson, J.H.F. and Newberry, R.J. (2000) Gold Deposits Related to Reduced Granitic Intrusions. Reviews in Economic Geology, 13, 377-400. https://doi.org/10.5382/Rev.13.11
Lang, J.R. and Baker, T. (2001) Intrusion-Related Gold Systems: The Present Level of Understanding. Mineralium Deposita, 36, 477-489. https://doi.org/10.1007/s001260100184
Schwoerer, P. (1965) Notice explicative sur la feuille Garoua Est avec carte géologique de reconnaissance au 1/500000. Direction des mines et géologie, Imprimerie Nationale Yaoundé, Yaoundé, 49 p.
Thoste, V. (1985) Mineral Exploration in North Cameroon, Region of Poli. Final Report, Federal Republic of Germany, Number of Project 80.2273.3.
Pinna, P., Edimo, A., Jézéquel, J., Tchounthoui, D. and Ebotayuk-Ebop, M. (1989) Inventaireminier du Centre Nord-Cameroun, (troisième phase) open-file Report 86 CMR168. Bureau de Recherches Géologiques et Minières, France.
Njel, U.O. (1986) Paléogéographie d’un Segment de l’Orogenèse Panafricaine, la Ceinture Volcano-Sédimentaire de Poli (Nord Cameroun). Compte Rendu de l’Académie des Sciences, 30, 1737-1742.
Kouské, A.P., Suh, C.E., Ghogomu, R.T. and Ngako, V. (2012) Na-Metasomatism and Uranium Mineralization during a Two-Stage Albitization at Kitongo, Northern Cameroon: Structural and Geochemical Evidence. International Journal of Geosciences, 3, 258-279. https://doi.org/10.4236/ijg.2012.31028
Fosso Tchunte, P.M., Tchameni, R., André-Mayer, A.S., Dakoure, H., Turlin, F., Poujol, M., Nomo, E., Saha Fouetsa, N.A. and Rouer, O. (2018) Evidence for Nb-Ta Occurrences in the Syn-Tectonic Pan-African Mayo Salah Leucogranite (Northern Cameroon): Constraints from Nb-Ta Oxide Mineralogy, Geochemistry and U-Pb LA-ICP-MS Geochronology on Columbite and Monazite. Minerals, 8, 10. https://doi.org/10.3390/min8050188
Dawai, D. (2014) Les plutons de Guider et de Bossoum-Pologozom (chaine panafricaine au Nord Cameroun): Analyse pétrographique, structurale, magnétique, géochronologique et implications géodynamiques. Doctorat de l’Université de Toulouse/Doctorat/PhD Université de Ngaoundéré, 208 p.
Dawai, D., Bouchez, J.L., Paquette, J.L. and Tchameni, R. (2013) The Pan-African Quartz-Syenite of Guider (North-Cameroon): Magnetic Fabric and U-Pb Dating of a Late-Orogenic Emplacement. Precambrian Research, 236, 132-144. https://doi.org/10.1016/j.precamres.2013.07.008
Toteu, F.S., Penaye, J. and Poudjoun Djomani, Y. (2004) Geodynamic Evolution of Pan-African Belt in Central Africa with Special Reference to Cameroon. Journal African Earth Sciences, 41, 73-85. https://doi.org/10.1139/e03-079
Ngako, V., Affaton, P. and Njonfang, E. (2008) Pan-African Tectonics in Northwestern Cameroon: Implication for the History of Western Gondwana. Gondwana Research, 14, 509-522. https://doi.org/10.1016/j.gr.2008.02.002
Van Schmus, W.R., Oliveira, E.P., Da Silva Filho, A.F., Toteu, S.F., Penaye, J. and Guimaraes, I.P. (2008) Proterozoic Links between the Borborema Province, NE Brazil, and the Central African Fold Belt. In: Pankhurst, R.J., Trouw, R.A.J., de Brito Neves, B.B. and De Wit, M.J., Eds., West Gondwana. Pre-Cenozoic Correlations across the South Atlantic Region, 294, Geological Society, London, 69-99. https://doi.org/10.1144/SP294.5
Toteu, S.F., Penaye, J., Deloule, E., Van Schmus, W.R. and Tchameni, R. (2006) 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 Yaounde Series (Cameroon). Journal of African Earth Sciences, 44, 428-442. https://doi.org/10.1016/j.jafrearsci.2005.11.011
Toteu, S.F. (1990) Geochemical Characterization of the Main Petrographical and Structural Units of Northern Cameroon: Implications for Pan-African Evolution. Journal of African Earth Sciences, 10, 615-624. https://doi.org/10.1016/0899-5362(90)90028-D
Zane, A. and Weiss, Z. (1998) A Procedure for Classifying Rock-Forming Chlorites Based on Microprobe Data. Rendiconti Lincei, 9, 51-56. https://doi.org/10.1007/BF02904455 Foster, M.D. (1962) Interpretation of the Composition and a Classification of the Chlorites. Prof. Pap. US Geological Survey, 414A, 1-33.
Miller, C.F., Stoddard, E.E., Bradfish, L.J. and Dollase, W.A. (1981) Composition of Plutonic Muscovite: Genetic Implications. Canadian Mineralogist, 19, 25-34.
Zheng, Z., Deng, X.H., Chen, H.J., Yue, S.W., Dong, L.H., Qu, X. and Chen, Y.J. (2016) Fluid Sources and Metallogenesis in the Baiganhu W-Sn Deposit, East Kunlun, NW China: Insights from Chemical and Boron Isotopic Compositions of Tourmaline. Ore Geology Reviews, 72, 1129-1142. https://doi.org/10.1016/j.oregeorev.2015.09.006
Elder, J.W. (1981) Geothermal Systems. Academic, Troy, 508 p.
Moorhouse, W.W. (1959) The Study of Rocks in Thin Section. Harper and Row, New York, 514 p.
Hofmeister, A.M. and Rossman, G.R. (1983) Color in Feldspars. In: Ribbe, P.H., Ed., Feldpsar Mineralogy, 2nd Edition, Reviews in Mineralogy No. 2, Mineralogical Society of America, Washington DC, 271-280. https://doi.org/10.1515/9781501508547-016
Craw, D., Windle, S.J. and Angus, P.V. (1999) Gold Mineralization without Quartz Veins in a Ductile-Brittle Shear Zone, Macraes Mine, Otago Schist, New Zealand. Mineralum Deposita, 34, 382-394. https://doi.org/10.1007/s001260050211
Dubé, B., Gosselin, P., Mercier-Langevin, P., Hannington, M. and Galley, A. (2007) Gold-Rich Volcanogenic Massive Sulphide Deposits. In: Goodfellow, W.D., Ed., Mineral Deposits of Canada: A Synthesis of Major Deposit-Types, Disctict Metallogeny, the Evolution of Geological Provinces, and Exploration Methods, Geological Association of Canada, Mineral Deposits Division, Special Publication 5, 75-94.
Kesler, S.E., Riciputi, L.C. and Ye, Z. (2005) Evidence for a Magmatic Origin for Carlin-Type Gold Deposits: Isotopic Composition of Sulfur in the Betze-Post Screamer Deposit, Nevada, USA. Mineralium Deposita, 40, 127-136. https://doi.org/10.1007/s00126-005-0477-9
Hedenquist, J.W. and Lowenstern, J.B. (1994) The Role of Magmas in the Formation of Hydrothermal Ore Deposits. Nature, 370, 519-552. https://doi.org/10.1038/370519a0
Bierlein, F.P. and Maher, S. (2001) Orogenic Disseminated Gold in Phanerozoic Fold Belts Examples from Victoria, Australia and Elsewhere. Ore Geology Reviews, 18, 113-148. https://doi.org/10.1016/S0169-1368(01)00019-1
Titley, S.R. (1994) Evolutionary Habits of Hydrothermal and Supergene Alteration in Intrusion-Centred Ore Systems, Southwestern North America. In: Lentz, D.R., éd., Alteration and Alteration Processus Association with Ore-Forming Systems, Geological Association of Canada, St. John’s, Short Course Notes No. 11, 237-259.
MacLean, W.H. and Lawrence, D.H. (1991) Geochemistry of Hydrothermally Altered Rocks at the Home Mine, Noranda, Quebec. Economic Geology, 86, 506-528. https://doi.org/10.2113/gsecongeo.86.3.506
Chaker, M. (1997) Géochimie et métallogénie de la mine d’or de Tiouit, anti-atlas oriental sud du Maroc. Thèse présentée à l’Université du Québec à chicoutimi. https://doi.org/10.1522/1531540
Windh, J. (1995) Saddle Reef and Related Gold Mineralization, Hill End Gold Field, Australia: Evolution of an Auriferous Vein System during Progressive Deformation. Economic Geology, 90, 1764-1775. https://doi.org/10.2113/gsecongeo.90.6.1764
Vila, T. and Sillitoe, R.H. (1991) Gold-Rich Porphyry Systems in the Mari-Cunga Belt, Northern Chile. Economic Geology, 86, 1238-1260. https://doi.org/10.2113/gsecongeo.86.6.1238
Kilinc, I.A. (1969) Composition of Melts Formed from Partial Melting of Shales and Graywackes. Geological Society of America, Annual Meeting, 125 Abstracts, Boulder.
Whitney, A. and Stormer Jr., C. (1985) Mineralogy, Petrology, and Magmatic Conditions from the Fish Canyon Tuff, Central San Juan Volcanic Field, Colorado. Journal of Petrology, 26, 726-762. https://doi.org/10.1093/petrology/26.3.726
Arancibia, O.N. and Clark, A.H. (1996) Early Magnetite-Amphibole-Plagioclase Alteration-Mineralization in the Island Copper Porphyry Copper-Gold Molybdenum Deposit, British Columbia. Economic Geology, 91, 402-438. https://doi.org/10.2113/gsecongeo.91.2.402
Pettke, T., Oberli, F. and Heinrich, C.A. (2010) The Magma and Metal Source of Giant Porphyry-Type Ore Deposits, Based on Lead Isotope Microanalysis of Individual Fluid Inclusions. Earth Planetary Science Letter, 296, 267-277. https://doi.org/10.1016/j.epsl.2010.05.007
Sun, W., Huang, R., Li, H., Hu, Y., Zhang, C., Sun, S., Zhang, L., Ding, X., Li, C., Zartman, R.E. and Ling, M. (2015) Porphyry Deposits and Oxidized Magmas. Ore Geological Reviews, 65, 97-131. https://doi.org/10.1016/j.oregeorev.2014.09.004
Selby, D., Nesbitt, B.E., Muehlenbachs, K. and Prochaska, W. (2000) Hydrothermal Alteration and Fluid Chemistry of the Endako Porphyry Molybdenum Deposit, British Columbia. Economic Geology, 95, 183-202. https://doi.org/10.2113/gsecongeo.95.1.183
Beane, R.E. and Titley, S.R. (1981) Porphyry Copper Deposits. Part II. Hydrothermal Alteration and Mineralization. Economic Geology 75th Anniversary, 235-269.