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Occurrence of zoned uvarovite—grossular garnet in a rodingite from the Vumba Schist Belt, Botswana, Africa: implications for the origin of rodingites

Published online by Cambridge University Press:  05 July 2018

A. Mogessie  and
D. Rammlmair
A. Mogessie
Affiliation:
Institute of Mineralogy - Crystallography and Petrology Karl - Franzens University Graz, Universitatsplatz 2, A-8010 Graz, Austria
D. Rammlmair
Affiliation:
Federal Institute for Geosciences and Natural Resources, Stilleweg 2, D-30655 Hannover, Germany
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Abstract

Based on petrographic, mineralogical and geochemical data, two groups of rodingites have been documented from the polymetamorphic Vumba Schist Belt of Botswana. Group I rodingites contain relict chromite grains with zoned uvarovite-grossular + clinopyroxene + epidote/zoisite ± quartz, whereas group II rodingites contain no chromite and uvarovite. Although the presence of chromite with Cr/(Cr + Al + Fe3+) ratio > 90, similar to chromites found in komatiites, suggests a possible komatiitic origin of group I rodingites, the major and trace element chemical data of most analysed basic rocks from this belt indicate that the protoliths of both groups of rodingites are related to basalt/gabbro of komatiitic affinity. The rodingites formed during the M3 phase of metamorphism.

Keywords

rodingitechromiteuvarovitegrossularVumbaBotswana
Type
Petrology
Information
Mineralogical Magazine , Volume 58 , Issue 392 , September 1994 , pp. 375 - 386
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1994

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References

Anhaeusser, C. R. (1979) Precambrian Res., 8, 49–76.Google Scholar
Barriga, F. and Fyfe, W. S. (1983) Contrib. Mineral. Petrol., 84, 146–51.Google Scholar
Bavinton, O. A. and Taylor, S. R. (1980) Geochem. Cosmochim. Acta, 44, 639–48.Google Scholar
Bell, J. M., Clarke, E. de C. and Marschall, P. (1911) New Zealand Geol. Survey Bull., 12, 1–71.Google Scholar
Bence, A. E. and Albee, A. L. (1968) J. Geol., 71 382-403.Google Scholar
Bjerg, S. C, Mogessie, A. and Bjerg, E. (1992) Computers Geoscl, 18, 6, 717–45.Google Scholar
Bilgrami, S. A. and Howie, R. A. (1960) Amer. Mineral, 45, 791–801.Google Scholar
Bloxam, T. W. (1954) Mineral. Mag., 30, 525–8.Google Scholar
Coleman, R. G. (1967) U.S. Geol. Surv. Bull., 1247, 49 pp.Google Scholar
Coleman, R. G. (1977) Ophiolites. Springer Verlag., New York, 229 pp.Google Scholar
De, A. (1972) Geol. Soc. Amer. Memoir. 132, 489-501.Google Scholar
Dietrich, H., Roller, F., Richter, W. and Kiesel, W. (1986) SMPM, 66, 163–92.Google Scholar
Evans, B. W., Trommsdorff, V., and Goles, G.G. (1981) Contrib. Mineral. Petrol., 76, 301–311.Google Scholar
Groves, D. I., Lesher, C. M. and Gee, R. D. (1984) In Sulphide deposits in mafic and ultramafic rocks (D. L. Buchanan and M. J. Jones, eds.). IMM, London, 1—13.Google Scholar
Hall, A. and Ahmed, Z. (1984) Chem. Erde, 43, 45–56.Google Scholar
Honnorez, J. and Kirst, P. (1975) Contrib. Mineral. Petrol, 49, 233–57.Google Scholar
Kalamarides, R. I and Bjerg, J.H. (1988) Can. Mineral, 26, 335–42.Google Scholar
Litherland, M. (1975) Geological Survey of Botswana Government Printer, Gaborone, District Memoir., 2, 133 pp. Ludtke, G., Mosigi, B. and Zeil, P. (1989) Final report BGR, Hannover. Archive No. 105549, 93 pp. Mittwede, S. K. and Schandl, E. S. (1992) Eur. J. Mineral, 4, 7–16.Google Scholar
Mogessie, A., Purtscheller, F. and Tessadri, R. (1988) Mineral Mag., 52, 229–36.Google Scholar
Morimoto, N. (1988) Mineral. Petrol, 39, 55–76.Google Scholar
Mosigi, B. and Rammimair, D. (1991) In GOLD ‘91 BRAZIL. (E. A. Ladeira, ed.) Balkema, Rotterdam, 217-20.Google Scholar
Rammimair, D. Mogessie, A., Purtscheller, F., and Tessadri, R. (1988) Amer. Mineral, 73, 651-6 Rickwood, P. C. (1968) Contrib. Mineral. Petrol, 18, 175–98.Google Scholar
Schandl, E. S., O'Hanley, D. S. and Wicks, F. J. (1989) Can. Mineral, 27, 579–91.Google Scholar
Thayer, T. P. (1966) Amer. Mineral, 51, 605–9.Google Scholar
Trommsdorff, V., Evans, B. W. and Richter, W. (1975) Schweiz Mineral. Petrogr. Mitt., 44, 572–4.Google Scholar
von Knorring, O. (1951) Mineral. Mag., 29, 594–601.Google Scholar
Willemse, J. and Bensch, J. J. (1964) Trans. Geol. Soc. S. Africa, 67, 1–87.Google Scholar
Yuanming, P. and Fleet, M. F. (1989) Can. Mineral, 27, 565–77.Google Scholar