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Tourmalinites from the stratiform peraluminous metamorphic suite of the Central Namaqua Mobile Belt (South Africa)

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Abstract

Tourmalinites as proximal fades equivalents of stratiform peraluminous metamorphic rocks occur stratigraphically below base metal deposits and above thick metarhyolite horizons. Their premetamorphic protoliths are believed to have originated by tourmaline precipitation from exhalative B-, F- and W-rich brines also transporting aluminous clay colloids and dissolved silica. Tourmaline chemistry is used as an effective petrogenetic sensor. The tourmalines are Al-saturated, alkali-deficient dravite-schorl solid solutions, which are in the compositional range of tourmalines originated by exhalative processes. F-substitution in tourmalines is governed by Fe-F-avoidance. F is relatively enriched in the tourmalines and can potentially be used as a tracer for the source of primary hydrothermal solutions. Ti is introduced into the tourmalines by the substitution scheme Ti+AlIV=AlY+Si. The high Ti-contents of the tourmalines as well as those of coexisting muscovites represent evidence of high-temperature metamorphism. Many tourmalines exhibit continuous zoning, which can partly be attributed to external fluid influx near peak metamorphic conditions.

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References

  • Appel, P.W.U., Garde, A.A. (1987) Stratabound scheelite and stratiform tourmalinites in the Archean Malene supracrustal rocks, southern West Greenland. — Grønlands Geol. Undersøgelse Bull. 156:1–26

    Google Scholar 

  • Armstrong, R.A., Reid, D.L., Watkeys, M.K., Lipson, R.D., Welke, H.J., Compston, W. (1988) Zircon U-Pb ages from the Aggeneys area, Central Bushmanland. Ext. Abstr. Geocongress 1988 Durban, pp. 493–499

  • Bell, H. (1982) Strata-bound sulfide deposits, wall-rock alteration and associated tin-bearing minerals in the Carolina Salte Belt, South Carolina and Georgia. Econ. Geol. 77:294–311

    Google Scholar 

  • Blignault, H.J., VanAswegen, G., Merwe, S.W. Van der, Colliston, WP. (1983) The Namaqualand geotraverse and environs: part of the Proterozoic Namaqua Mobile Belt. Spec. Pub. Geol. Soc. S. Afr. 10:1–29

    Google Scholar 

  • Brown, C.E., Ayuso, R.A. (1985) Significance of tourmaline-rich rocks in the Grenville Complex of St. Lawrence Country, New York. US Geol. Surv. Bull. 1626C:33 pp.

  • 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. 107:397–402

    Google Scholar 

  • Colliston, W.P., Praekelt, H.E., Strydom, D., Pretorius, J.J. (1986a) Stratigraphic map of Central Bushmanland 1:100 000. Univ. Bloemfontein

    Google Scholar 

  • Colliston, W.P., Praekelt, H.E., Strydom, D., Loock, J.C. (1986b) Aspects of the stratigraphy and depositional environment of part of the Bushmanland Group in the Aggeneys Terrane, Namaqua Mobile Belt. Abstr. Geocongress Johannesburg, pp. 773–776

  • Colliston, W.P., Praekelt, H.E., Schoch, A.E. (1989) A broad perspective (Haramoep) of geological relations established by sequence mapping in the Proterozoic Aggeneys terrane, Bushmanland, South Africa. S. Afr. J. Geol. 92:42–48

    Google Scholar 

  • Ekström, T.K. (1972) The distribution of fluorine among some coexisting minerals. Contrib. Mineral. Petrol. 34:192–200

    Google Scholar 

  • Ethier, V.G., Campbell, F.A. (1977) Tourmaline concentrations in Proterozoic sediments of the southern Cordillera of Canada and their economic significance. Canad. J. Earth Sci. 14:2348–2363

    Google Scholar 

  • Feenstra, A. (1985) Metamorphism of bauxites on Naxos, Greece. Geologica Ultraiectina 39:206 pp.

    Google Scholar 

  • Foster, R.P., Mann, A.G., Armin, T., Burmeister, B.B. (1975) Richardson's Kop wolframite deposi, Rhodesia: a geochemical model for the hydrothermal behaviour of tungsten. In: Verwoerd, W.J. (ed) Mineralization in metamorphic terranes. Van Schaik, Pretoria, pp. 107–128

    Google Scholar 

  • Frick, C., Coetzee, C.B. (1974) The mineralogy and the petrology of the sillimanite deposits west of Pofadder, Namaqualand. Trans. Geol. Soc. S. Afr. 77:169–183

    Google Scholar 

  • Guidotti, C.V. (1984) Micas in metamorphic rocks. In: Bailey, S.W. (ed) Micas. Reviews in Mineralogy 13:357–467

  • Henry, D.J., Guidotti, C.V. (1985) Tourmaline as a petrogenetic indicator mineral: an example from the staurolite-grade metapelites of NW Maine. Amer. Miner. 70:1–15

    Google Scholar 

  • Manning, D.A.C., Hill, P.I. (1990) The petrogenetic and metallogenetic significance of topaz granite from the southwest England ore field. Geol. Soc. Amer. Spec. Pap. 246:51–69

    Google Scholar 

  • Massonne, H.-J., Schreyer, W. (1987) Phengite geobarometry based on the limiting assemblage with K-feldspar, phlogopite and quartz. Contrib. Mineral. Petrol. 96:212–224

    Google Scholar 

  • Moore, J.M. (1977) The geology of Namiesberg, northern Cape. Bull. Precambr. Res. Unit, Univ. Cape Town 20:69 pp.

    Google Scholar 

  • Moore, J.M. (1980) Paleo-environmental implications of the origin of sillimanite-rich rocks in the North-West Cape, South Africa, and their relation to the sulfide deposits of the area. Proc. 5th Quad. IAGOD Symp. 1:209–215

    Google Scholar 

  • Moore, J.M. (1986) A comparative study of metamorphosed supracrustal rocks from Western Namaqualand Metamorphic Complex. Unpublished PhD thesis, Univ. Cape Town, 370 pp.

  • Munoz, J.L. (1984) F-OH and Cl-OH exchange in micas with applications to hydrothermal ore deposits. In: Bailey, S.W. (ed) Micas. Reviews in Mineralogy 13:469–494

  • Neiva, A.M.R. (1974) Geochemistry of tourmaline (schorlite) from granites, aplites and pegmatites from Northern Portugal. Geochim. Cosmochim. Acta 38:1307–1317

    Google Scholar 

  • Nemec, D. (1969) Fluorine in tourmalines. Contrib. Mineral. Petrol. 20:235–243

    Google Scholar 

  • Palmer, M.R., Slack, J.F. (1989) Boron isotopic composition of tourmaline from massive sulfide deposits and tourmalinites. Contrib. Mineral. Petrol. 103:434–451

    Google Scholar 

  • Plimer, I.R. (1983) The association of tourmaline-bearing rocks with mineralisation at Broken Hill, NSW. Proc. Ann. Aust. Inst. Metall. Conf., pp. 157–176

  • Plimer, I.R. (1984) The role of fluorine in submarine exhalative systems with special reference to Broken Hill, Australia. Mineral. Deposita 19:19–25

    Google Scholar 

  • Plimer, I.R. (1986) Tourmalinites from the Golden Dyke Dome, Northern Australia. Mineral. Deposita 21:263–270

    Google Scholar 

  • Plimer, I.R. (1987) The association of tourmalinite with stratiform scheelite deposits. Mineral. Deposita 22:282–291

    Google Scholar 

  • Reid, D.L., Welke, H.J., Erlank, A.J., Betton, P.J. (1987) Composition, age and tectonic setting of amphibolites in the Central Bushmanland Group, Western Namaqua Province, Southern Africa. Precambrian Res. 36:99–126

    Google Scholar 

  • Rozendaal, A. (1982) The petrology of the Gamsberg zinc deposit and the Bushmanland iron formations with special reference to their relationships and genesis. PhD thesis Univ. Stellenbosch, 349 pp.

  • Rumble, D. (1976) Oxide minerals in metamorphic rocks. In: Rumble, D. (ed) Oxide minerals. Reviews in Mineralogy 3:R1–R24

  • Schmidt, R.G. (1985) High-alumina hydrothermal systems in volcanic rocks and their significance to mineral prospecting in the Carolina Slate Belt. US Geol. Surv. Bull. 1562:69 pp.

  • Schreyer, W, Abraham, K. (1976) Three-stage metamorphic history of a whiteschist from Sar e Sang, Afghanistan, as part of a former evaporite deposit. Contrib. Mineral. Petrol. 59:111–130

    Google Scholar 

  • Slack, J.F. (1982) Tourmaline in Appalachian-Caledonian massive sulphide deposits and its exploration significance. Trans. Instn. Min. Metall. (Sect. B: Appl. Earth. Sci.) 91:B81-B89

    Google Scholar 

  • 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

    Google Scholar 

  • Smith, G.I. (1979) Subsurface stratigraphy and geochemistry of Late Quaternary Evaporites, Searles Lake, California. US Geol. Surv. Prof. Paper 1043:130 pp.

  • Taylor, B.E., Slack, J.F. (1984) Tourmalines from Appalachian Caledonian massive sulfide deposits: textural, chemical and isotopic relationships. Econ. Geol. 79:1703–1726

    Google Scholar 

  • Watkeys, M.K. (1986) The Achab gneiss: a floor in Bushmanland or a flaw in Namaqualand? Trans. Geol. Soc. S. Afr. 89:116–134

    Google Scholar 

  • Werding, G., Schreyer, W. (1984) Alkali-free tourmaline in the system MgO-Al2O3-B2O3-SiO2-H2O. Geochim. Cosmochim. Acta 48:1331–1344

    Google Scholar 

  • Willner, A., Schreyer, W., Moore, J.M. (1990) Peraluminous metamorphic rocks from the Namaqualand Metamorphic Complex (South Africa) geochemical evidence for an exhalation-related, sedimentary origin in a Mid-Proterozoic rift system. Chemical Geology 81:221–240

    Google Scholar 

  • Willner, A.P., Schreyer, W. (1991) A dumortierite-topaz-white mica fels from the peraluminous metamorphic suite of Bushmanland (South Africa). N. Jb. Min. Mh. 1991:223–240

    Google Scholar 

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  1. Institut für Mineralogie, Ruhr-Universität Bochum, Postfach 10 21 48, W-4630, Bochum, Germany

    A. P. Willner

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Willner, A.P. Tourmalinites from the stratiform peraluminous metamorphic suite of the Central Namaqua Mobile Belt (South Africa). Mineral. Deposita 27, 304–313 (1992). https://doi.org/10.1007/BF00193401

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  • DOI: https://doi.org/10.1007/BF00193401

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