Geochemistry and ion microprobe (SHRIMP) age of a quartz porphyry sill in the Mozaan Group of the Pongola Supergroup: Implications for the Pongola and Witwatersrand Supergroups

South African Journal of Geology

Volumn 102, Issue 2, 1999, Pages 139-146

  Gutzmer, J ^a   Nhleko, N ^a,c   Beukes, N J ^a   Pickard, A ^b   Barley, M E ^b  

^a UNIVERSITY OF JOHANNESBURG   (South Africa)

^b UNIVERSITY OF WESTERN AUSTRALIA   (Australia)

^c Geol Survey and Mines Department   (Swaziland)

Author keywords

[No Author keywords available]

Indexed keywords

ARCHEAN; CRATON; GEOCHEMISTRY; ION MICROPROBE; METASEDIMENTARY ROCK;

SWAZILAND;

EID: 0033452715     PISSN: 10120750     EISSN: None     Source Type: Journal    
DOI: None     Document Type: Article

References (24)

1. Armstrong, R.A., Compston, W., Retief, E.A., Williams, I.S. and Welke, H.J. (1991). Zircon ion microprobe studies bearing on the age and evolution of the Witwatersrand triad. Precambrian Res., 53, 243-266.
2. Beukes, N.J. and Cairncross, B. (1991) A lithostratigraphic-sedim entological reference profile for the late Mozaan Group, Pongola Sequence: application to sequence stratigraphy and correlation with the Witwatersrand Supergroup. S. Afr. J. Geol., 94, 44-69.
3. Beukes, N.J. and Nelson, J.P. (1995). Sea-level fluctuation and basin subsidence controls on the setting of auriferous palaeoplacers in the Archaean Witwatersrand Supergroup: A genetic and sequence stratigraphic approach. Ext. Abstr. Centennial Geocongress, Geol. Soc. S. Afr., Rand Afrikaans University, Johannesburg, South Africa, 1, 860-863.
4. Chappell, B.W. and White, A.J.R. (1974). Two contrasting granite types. Pacific Geol., 8, 173-174.
5. Chappell, B.W. and White, A.J.R. (1977). Ultrametamorphism and granitoid genesis. Tectonophysics, 43, 7-22.
6. Compston, W., Williams, I.S. and Myer, C. (1984). U-Pb geochronology of zircons from Breccia 73217 using a sensitive high mass-resolution ion m icroprobe. J. Geophys. Res., 89 (Suppl.), B525-B534.
7. Cox, K.G., Bell, J.D. and Pankhurst, R.J. (1979). The interpretation of Igneous Rocks. Allen and Unwin, London, 450 pp.
8. Grobler, D.F. and Walraven, F. (1993). Geochronology of Gaborone Granite Complex extensions in the area north of Mafikeng, South Africa. Chem. Geol., 105, 319-337.
9. Hammerbeck, E.C.I. (1977). The Usushwana Complex in southeastern Transvaal, with special reference to its economic potential. Ph.D. thesis (unpubl.), Univ. Pretoria, South Africa, 226 pp.
10. Hegner, E., Kröner, A. and Hofmann, A.W. (1984). Age and geochemistry of the Archaean Pongola and Usushwana Suites in Swaziland, Southern Africa: a case for crustal contamination for mantle derived magma. Earth Planet. Sci. Lett., 70, 267-279.
11. Hegner, E., Kröner, A. and Hunt, P. (1994). A precise U-Pb zircon age for the Archaean Pongola Supergroup volcanics in Swaziland. J. Afr. Earth Sci., 18, 339-341.
12. Hunter, D.R. (1963). The Mozaan series in Swaziland. Bull. Geol. Surv. Mines Dept. Swaziland, 3, 5-16.
13. Hunter, D.R. (1991). The Geology of Swaziland. Webster Print., Mbabane, 104 pp.
14. Hunter, D.R. and Gold, D.J.C. (1993). A re-examination of the stratigraphy of the Pongola Sequence in Swaziland and northern Natal. Ext. Abstr. 16th Colloquium on African Geology, Swaziland, 159-161.
15. Maniar, P.D. and Piccoli, P.M. (1989). Tectonic discrimination of granitoids. Bull. Geol. Soc. Am., 101, 635-643.
16. Maphalala, R.M. and Kröner. A. (1993). Pb-Pb single zircon ages for the younger Archaean granitods of Swaziland, southern Africa. Ext. Abstr. 16th Colloquium on African Geology, Mbabane. Swaziland, 201-206.
17. Nelson, J.P., Beukes, N.J. and Cairncross, B. (1995) Tectono-stratigraphic setting of the ∼2.9 Ga Mozaan Group of the Pongola Supergroup and correlation with the Witwatersrand Supergroup. Ext. Abstr. Centennial Geocongress, Geol. Soc. S. Afr., Rand Afrikaans Univ., Johannesburg, South Africa, 1, 838-840.
18. Pearce, J.A. (1996). Sources and settings of granitic rocks. Episodes, 19, 120-125.
19. Pearce, J.A., Harris, B.W.M. and Tindle, G.A. (1984).Trace element discrim ination diagrams for the tectonic interpretation of granitic rocks. J. Petrol., 25, 956-983.
20. Tankard, A.J., Jackson, M.P.A., Eriksson, K.A., Hobday, D.K., Hunter, D.R. and Minter, W.E.L. (1982). Crustal Evolution of Southern Africa. Springer-Verlag, New York, USA, 523 pp.
21. Trumbull, R.B. (1993). A petrological and Rb-Sr isotopic study of an early Archean fertile granite-pegmatite system; the Sinceni Pluton in Swaziland. Precambrian Res., 61, 89-116.
22. Walraven, F., Grobler, D.F. and Key, R.M. (1996). Age equivalence of the Plantation Porphyry and the Kanye Volcanic Formation, southeastern Botswana. S. Afr. J. Geol., 99, 28-31.
23. Wilson, M. (1989). Igneous Petrogenesis: A Global Tectonic Aproach. Chapman and Hall, London, UK, 466 pp.
24. Zussman, J. (1967). Physical Methods in Determinate Mineralogy. Academic Press, London, 514 pp.