Abstract
Three types of tourmaline occurrence have been identified in the area of Bin Yauri, Nigeria, mesothermal lode-gold mineralization. These are: (1) stratabound tourmalinites in pelitic metasediments, (2) tourmaline in a hydrothermal alteration assemblage within hornfelsed wall rocks, (3) tourmaline in auriferous quartz and quartz-carbonate veins. Although the tourmaline occurrences are all within or close to the contact aureole of a granodiorite intrusion, geochemical characteristics of the tourmalines are broadly similar and reflect a common metasedimentary source. Two stages of tourmalinization are envisaged. The earlier (ca. 1100 Ma) involved syngenetic-diagenetic formation of tourmalinites, while the later (ca. 500 Ma) involved epigenetic (hydrothermal) tourmaline-gold mineralization, possibly derived by dehydration and devolatilization of metasedimentary sequences containing tourmaline-rich rocks or tourmalinites. Electron microprobe analyses indicate that the tourmalines are intermediate members of the schorl-dravite solid solution series. Plots involving FeO, MgO, and/or Al2O3 from these analyses are used to constrain the sources and processes of tourmalinization. Two metallogenic implications are derived from this study. One is that, although the tourmalinites are barren of gold and base metal mineralization, their occurrences nevertheless encourages exploration for syngenetic-exhalative massive sulphide deposits in the region. The other implication applies to the potential use of tourmaline in deciphering the physico-chemical conditions of gold-mineralizing fluids in the Bin Yauri area.
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Ajibade, A.C., Wright, J.B. (1989) The Togo-Benin-Nigeria shield: evidence of crustal aggregation in the Pan-African belt. Tectonophysics 165: 125–129
Appleby, A-K., Williams, P.J. (1988) Epigenetic tourmalinite and arsenopyrite in the aureole of the Leinster batholith, SE Ireland. Mineral. Deposita 23: 247–255
Augustithis, S.S. (1967) On the textures and paragenesis of the gold-quartz-tourmaline veins of Ondonoc, W. Ethiopia. Mineral. Deposita 3: 48–55
Bandyopadhyay, B.K., Slack, J.F., Palmer, M.R., Roy, A. (1993) Tourmalinites associated with stratabound massive sulphide deposits in the Proterozoic Sakoli Group, Nagpur district, central India. In: Maurice, Y. (ed.) Proceedings of the Eighth Quadrennial IAGOD Symposium, Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, pp. 867–885
Beaty, D.W., Hahn, G.A., Threlkeld, W.E. (1988) Field, isotopic, and chemical studies of tourmaline-bearing rocks in the Belt-Purcell Supergroup: genetic constraints and exploration significance for Sullivan type ore deposits. Can. J. Earth Sci. 25: 392–402
Black, P.M. (1971) Tourmalines from Cuvier Island, New Zealand. Mineral. Mag. 38: 347–376.
Bone, Y. (1988) The geological setting of tourmalinite at Rum Jungle, N.T., Australia — Genetic and economic implications. Mineral. Deposita 23: 34–41
Byerly, G.R., Palmer, M.R. (1991) Tourmaline mineralization in the Barberton greenstone belt, South Africa: early Archean metasomatism by evaporite-derived boron. Contrib. Mineral. Petrol. 107: 387–402
Cavaretta, G., Puxeddu, M. (1990) Schorl-dravite-ferridravite tourmalines deposited by hydrothermal magmatic fluids during early evolution of the Larderello geothermal field, Italy. Econ. Geol. 85: 1236–1251
Dommanget, A., Dialo, M., Guilloux, L. (1985) Un nouveau type de gisement d'or: Loulo (Mali). Chron. Reserche Miniere 53: 5–18
Ethier, V.G., Campbell, F.A. (1977) Tourmaline concentrations in Proterozoic sediments of the southern Cordillera of Canada and their economic significance. Can. J. Earth Sci. 14: 2348–2363
Fieremans, M., Paepe, P.D. (1982) Genesis of tourmalinites from Belgium: Petrographical and chemical evidence. Mineral. Mag. 46: 95–102
Fitches, W.R., Ajibade, A.C., Egbuniwe, I.G., Holt, R.W., Wright, J.B. (1985) Late Proterozoic schist belts and plutonism in north-western Nigeria. J. Geol. Soc. Lond. 142: 319–337
Fleischer, R., Routhier, P. (1973) The consanguinous origin of a tourmaline-bearing gold deposit: Pasagem de Mariana (Brazil). Econ. Geol. 68: 11–22
Fortey, N.J., Cooper, D.C. (1986) Tourmalinization in the Skiddaw Group around Crummock Water, English Lake District. Mineral. Mag. 50: 17–26
Fuh, C.G. (1990) The geochemical and structural controls on gold mineralization in the Colomines area; Pan-African belt of eastern Cameroon. Unpublished Ph.D. Thesis, University of London
Gallagher, V. (1987) Tourmaline-bearing rocks and granite-related metallogenesis in SE Ireland. Unpublished Ph.D. Thesis, National University of Ireland
Garba, I. (1985) Geological and geochemical investigation of the gold occurrences north of Isanlu, Kwara State, Nigeria. Unpublished M.Sc. Thesis, Ahmadu Bello University, Nigeria
Garba, I. (1988) The variety and possible origin of the Nigerian gold mineralization. Okolom-Dogondaji and Waya veins as case studies. J. Afr. Earth Sci. 7: 981–986
Garba, I. (1992) A rare earth element (REE) study of Bin Yauri gold deposit, Nigeria. Trans. Inst. Min. Metall. 80B: 158–161
Garba, I., Akande, S.O. (1992) The origin and significance of non-aqueous CO2 fluid inclusions in the auriferous veins of Bin Yauri, northwestern Nigeria. Mineral. Deposita 27: 249–255
Goldfarb, R.J., Leach, D.L., Pickthorn, C.J. (1988) Origin of lode gold deposits of the Juneau gold belt, southeastern Alaska. Geology 16: 440–443
Groves, D.I., Foster, R.P. (1991) Archaean lode gold deposits. In: Foster, R.P. (ed.) Gold metallogeny and exploration. Blackie, Glasgow London, pp. 63–103
Grovorov, I.N. (1971) Thermodynamic calculation and the interpretation of tourmaline systems. Chem. Abstr. 76: 129893s
Henry, D.J., Guidotti, C.V. (1985) Tourmaline as a petrogenetic indicator mineral: an example from the staurolite-grade metapelites of NW Maine. Am. Mineral. 70: 1–15
Kerrich, R. (1989) Archean gold: relation to granulite formation or felsic intrusion? Geology 17: 1011–1015
King, R.W. (1988) Geochemical characteristics of tourmaline from Superior Province Archean lode gold deposits: implications for source regions and processes. In: Bicentennial Gold '88. Geol. Soc. Austr., Abstract Series No. 22, vol. 2, pp 445–447
McArdle, P., Fitzell, M., Oosterom, M.G., O'Connor, P.J., Kennan, P.S. (1989) Tourmalinite as a potential host rock for gold in the Caledonides of southeast Ireland. Mineral. Deposita 24: 154–159
McCurry, P. (1971) The relationship between optical properties and occurrence of some black tourmalines from northern Nigeria. Mineral. Mag. 38: 369–373
McCurry, P., Wright, J.B. (1977) Geochemistry of calc-alkaline volcanics in NW Nigeria and a possible Pan-African suture zone. Earth Planet. Sci. Lett. 37: 90–96
Nesbitt B.E. (1991) Phanerozoic gold deposits in tectonically active continental margins. In: Foster, R.P. (ed.) Gold metallogeny and exploration. Blackie, Glasgow and London, pp. 104–132
Pirajno, F., Smithies, R.H. (1992) The FeO/(FeO + MgO) ratio of tourmaline: A useful indicator of spatial variations in graniterelated hydrothermal mineral deposits. J. Geochem. Explor. 42: 371–381
Plimer, I.R. (1986) Tourmalinites from the Golden Dyke dome, northern Australia. Mineral. Deposita 21: 263–270
Plimer, I.R. (1988) Tourmalinites associated with Australian Proterozoic submarine exhalative ores. In: Friedrich, G.H., Herzig P.M. (eds.). Base metal sulfide deposits in sedimentary and volcanic environments. Springer, Berlin Heidelberg New York, pp. 255–283
Russ, W. (1957) The geology of parts of Niger, Zaria and Sokoto Provinces; with special reference to gold. Geol. Surv. Nigeria Bull. 27: 42p
Shibue, Y. (1984) Chemical compositions of tourmaline in the veintype tungsten deposits of the Kaneuchi mine, Japan. Mineral. Deposita 19: 298–303
Slack, J.F. (1982) Tourmaline in Appalachian-Caledonian massive sulphide deposits and its exploration significance. Trans. Inst. Min. Metall. 91B: 81–89
Slack, J.F., Coad, P.R. (1989) Multiple hydrothermal and metamorphic events in the Kidd Creek volcanogenic massive sulphide deposit, Timmins, Ontario: evidence from tourmalines and chlorites. Can. J. Earth Sci. 26: 694–715
Slack, J.F., Herriman, N., Barnes, R.G., Plimer, I.R. (1984) Stratiform tourmalinites in metamorphic terranes and their geologic significance. Geology 12: 713–716
Slack, J.F., Palmer, M.R., Stevens, B.P.J., Barnes, R.G. (1993) Origin and significance of tourmaline-rich rocks in the Broken Hills district, Australia. Econ. Geol. 88: 505–541
Taylor, B.E., Slack, J.F. (1984) Tourmalines from Appalachian Caledonian massive sulfide deposits: textural, chemical, and isotopic relationships. Econ. Geol. 79: 1703–1726
Watkins, P.J., Nolan, J. (1992) Determination of REE, Y, Sc and Hf using cation-exchange separation and inductively coupled plasma-atomic emission spectrometry. Chem. Geol. 95: 131–139
Williams, F.M., Kennan, P.S. (1983) Stable isotope studies of sulphide mineralization on the Leinster granite margin and some observations on its relationship to coticule and tourmalinite rocks in the aureole. Mineral. Deposita 18: 399–410
Woakes, M., Bafor, B.E. (1984) Primary gold mineralization in Nigeria. In: Foster, R.P. (ed.) Gold '82. Balkema, Rotterdam, pp. 661–671
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Garba, I. Tourmalinization related to Late Proterozoic-Early Palaeozoic lode gold mineralization in the Bin Yauri area, Nigeria. Mineral. Deposita 31, 201–209 (1996). https://doi.org/10.1007/BF00204027
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DOI: https://doi.org/10.1007/BF00204027