Petrogenesis of the Swaziland and Northern Natal Rhyolites of the lebombo rifted volcanic margin, South East Africa

Journal of Petrology

Volumn 48, Issue 1, 2007, Pages 185-218

  Miller, Jodie A ^a,b   Harris, Chris ^a  

^a UNIVERSITY OF CAPE TOWN   (South Africa)

^b STELLENBOSCH UNIVERSITY   (South Africa)

Author keywords

180 magmas; Lebombo; Low ; Partial melting; Rhyolite; Stable and radiogenic isotopes

Indexed keywords

FRACTIONAL CRYSTALLIZATION; ISOTOPIC COMPOSITION; PARTIAL MELTING; PETROGENESIS; RHYOLITE;

AFRICA; SOUTHERN AFRICA; SUB-SAHARAN AFRICA; SWAZILAND;

OUREBIA OUREBI;

EID: 33845990562     PISSN: 00223530     EISSN: 14602415     Source Type: Journal    
DOI: 10.1093/petrology/egl061     Document Type: Article

References (84)

1. Allsopp, H. L., Manton, W. I., Bristow, J. W. & Erlank, A. J. (1984). Rb-Sr geochronology of Karoo felsic volcanics. In: Erlank, A. J. (ed.) Petrogenesis of the Volcanic Rocks of the Karoo Province. Special Publication of the Geological Society of South Africa 13, 273-280.
2. 18O magmas: Why are they so rare? Earth and Planetary Science Letters 168, 123-136.
3. Betton, P. J. (1978). Geochemistry of Karoo volcanic rocks of Swaziland. D.Phil. dissertation, University of Oxford, 278 pp.
4. Betton, P. J. (1979). Isotopic evidence for crustal contamination in the Karoo rhyolites of Swaziland. Earth and Planetary Science Letters 45, 263-274.
5. 18O rhyolites after caldera collapse at Yellowstone, Wyoming, USA. Geology 28, 719-722.
6. 18O rhyolites from Yellowstone: Magmatic evolution based on analyses of zircons and individual phenocrysts. Journal of Petrology 42, 1491-1517.
7. 18O, large-volume silicic magmas at the Timber Mountain/ Oasis Valley caldera complex, Nevada. Geological Society of America Bulletin 115, 581-595.
8. 16O depletion of the upper crust. Geochimica et Cosmochimica Acta 68, 841-865.
9. 824.
10. 5 for oxygen isotope analysis. Geochimica et Cosmochimica Acta 46, 1665-1668.
11. Bristow, J. W. (1976). The geology and geochemistry of the southern Lebombo. MSc thesis, University of Natal, Durban, 331 pp.
12. Bryan, S. E., Riley, T. R., Jerram, D. A., Stephens, C. J. & Leat, P. T. (2002). Silicic volcanism: An undervalued component of large igneous provinces and volcanic rifted margins. In: Menzies, M. A., Klemperer, S. L. Ebinger, C. J. & Baker, J. A. (eds) Volcanic Rifted Margins. Geological Society of America, Special Papers 362, 97-118.
13. Clayton, R. N. & Mayeda, T. K. (1963). The use of bromine pentafluoride in the extraction of oxygen from oxides and silicates for isotopic analysis. Geochimica et Cosmochimica Acta 27, 43-52.
14. Cleverly, R. W. (1977). The structural and magmatic evolution of the Lebombo Monocline, Southern Africa, with particular reference to Swaziland. D.Phil. dissertation, University of Oxford, 316 pp.
15. Cleverly, R. W. (1979). The volcanic geology of the Lebombo Monocline in Swaziland. Transactions of the Geological Society of South Africa 82, 227-230.
16. Cleverly, R.W., Betton, P. J. & Bristow, J. W. (1984). Geochemistry and petrogenesis of the Lebombo rhyolites. In: Erlank, A. J. (ed.) Petrogenesis of the Volcanic Rocks of the Karoo Province. Special Publication of the Geological Society of South Africa 13, 171-194.
17. Condomines, M., Gronvold, K., Hooker, P. J., Muehlenbachs, K., O'Nions, R. K., Oskarsson, N. & Oxburgh, E. R. (1983). Helium, oxygen, strontium, and neodymium isotope relationships in Icelandic volcanics. Earth and Planetary Science Letters 66, 125-136.
18. Coplen, T. B. (1993). Normalisation of oxygen and hydrogen isotope data. Chemical Geology 72, 293-297.
19. Coplen, T. B., Kendall, C. & Hopple, J. (1983). Comparison of stable isotope reference samples. Nature 302, 236-238.
20. Cox, K. G. (1972). The Karoo volcanic cycle. Journal of the Geological Society, London 128, 311-336.
21. Cox, K. G. & Bristow, J.W. (1984). The Sabie River Basalt Formation of the Lebombo Monocline, and south-east Zimbabwe. In: Erlank, A. J. (ed.) Petrogenesis of the Volcanic Rocks of the Karoo Province. Special Publication of the Geological Society of South Africa 13, 125-147.
22. Cox, K. G., Duncan, A. R., Bristow, J. W., Taylor, S. R. & Erlank, A. J. (1984). Petrogenesis of the basic rocks of the Lebombo. In: Erlank, A. J. (ed.) Petrogenesis of the Volcanic Rocks of the Karoo Province. Special Publication of the Geological Society of South Africa 13, 149-170.
23. Dorendorf, F., Wiechert, U. & Worner, G. (2000). Hydrated sub-arc mantle: A source for the Kluchevskoy volcano, Kamatchka/Russia. Earth and Planetary Science Letters 175, 69-86.
24. Duncan, R. A., Erlank, A. J. & Marsh, J. S. (1984). Regional geochemistry of the Karoo Igneous Province. In: Erlank, A. J. (ed.) Petrogenesis of the Volcanic Rocks of the Karoo Province. Special Publication of the Geological Society of South Africa 13, 355-388.
25. Duncan, A. R., Armstrong, R. A., Erlank, A. J., Marsh, J. S. & Watkins, R. T. (1990). MORB-related dolerites associated with the final phases of Karoo flood basalt volcanism in southern Africa. In: Parker, A. J., Rickwood, P. C. & Tucker, D. H. (eds) Mafic Dykes and Emplacement Mechanisms. Rotterdam: Balkema, pp. 119-129.
26. Duncan, R. A., Hooper, P. R., Rehacek, J., Marsh, J. S. & Duncan, A. R. (1997). The timing and duration of the Karoo igneous event, southern Gondwana. Journal of Geophysical Research 102, 18127-18138.
27. Eales, H. V., Marsh, J. S. & Cox, K. G. (1984). The Karoo Igneous Province: An introduction. In: Erlank, A. J. (ed.) Petrogenesis of the Volcanic Rocks of the Karoo Province. Special Publication of the Geological Society of South Africa 13, 1-26.
28. Eglington, B. M. & Harmer, R. E. (1999). Geodate for Windows version 1: isotope regression and modelling software Council for Geoscience Open File Report 1999-0206-0, pp.1-51.
29. Eiler, J. M. (2001). Oxygen isotope variations in basaltic lavas and upper mantle rocks. Reviews in Mineralogy and Geochemistry 43, 319-364.
30. Encarnacion, J., Fleming, T. H., Elliot, D. H. & Eales, H. V. (1996). Synchronous emplacement of Ferrar and Karoo dolerites and the early breakup of Gondwana. Geology 24, 535-538.
31. Erlank, A. J., Marsh, J. S., Duncan, A. R., Miller, R. M., Hawkesworth, C. J., Betton, P. J. & Rex, D. C. (1984). Geochemistry and petrogenesis of Etendeka volcanic rocks from SWA/Namibia. In: Erlank, A. J. (ed.) Petrogenesis of the Volcanic Rocks of the Karoo Province. Special Publication of the Geological Society of South Africa 13, 195-247.
32. Ewart, A., Marsh, J. S., Milner, S. C., Duncan, A. R., Kamber, B. S. & Armstrong, R. A. (2004). Petrology and geochemistry of early Cretaceous bimodal continental flood volcanism of the NW Etendeka, Namibia. part 2: Characteristics and petrogenesis of the high-Ti latite and high-Ti and low-Ti voluminous quartz latite eruptives. Journal of Petrology 45, 107-138.
33. Faure, G. (1986). Principles of Isotope Geology, 2nd edn. New York: John Wiley, 589 pp.
34. Fleming, T. H., Foland, K. A. & Elliot, D. H. (1995). Isotopic and chemical constraints on the crustal evolution and source signature of Ferrar magmas, northVictoria Land, Antarctica. Contributions to Mineralogy and Petrology 121, 217-236.
35. Garland, F., Hawkesworth, C. J. & Mantovani, M. S. M. (1995). Description and petrogenesis of the Paraná rhyolites, southern Brazil. Journal of Petrology 36, 1193-1227.
36. Giletti, B. J. (1986). Diffusion effects on oxygen isotope temperatures of slowly cooled igneous and metamorphic rocks. Earth and Planetary Science Letters 77, 218-228.
37. 18O-buffering of the oceans by deep (>5 km) seawater-hydrothermal circulation at mid-ocean ridges. Journal of Geophysical Research 86, 2737-2755.
38. 18O silicic volcanic rocks at the Calabozos Caldera Complex, southern Andes. Contributions to Mineralogy and Petrology 95, 71-81.
39. 2 in continental flood basalt suites: The role of contamination and alteration. Geology 17, 634-636.
40. 18O rhyolites during the rifting of Africa and Antarctica: The Lebombo Monocline, southern Africa. Geochimica et Cosmochimica Acta 56, 3561-3570.
41. Harris, C. & Milner, S. C. (1997). Crustal origin for the Paraná rhyolites: Discussion of 'Description and petrogenesis of the Paraná rhyolites, southern Brazil' by Garland et al. (1995). Journal of Petrology 38, 299-302.
42. Harris, C., Whittingham, A. M., Milner, S. C. & Armstrong, R. A. (1990). Oxygen isotope geochemistry of the silicic volcanic rocks of the Etendeka/Paraná Province: Source constraints. Geology 18, 1119-1121.
43. Hawkesworth, C. J., Marsh, J. S., Duncan, A. R., Erlank, A. J. & Norry, M. J. (1984). The role of continental lithosphere in the generation of the Karoo volcanic rocks: Evidence from combined Nd- and Sr-isotope studies. In: Erlank, A. J. (ed.) Petrogenesis of the Volcanic Rocks of the Karoo Province. Special Publication of the Geological Society of South Africa 13, 341-354.
44. Hawkesworth, C. J., Gallagher, K., Kelley, S., Mantovani, M. S. M., Peate, D.W., Regelous, M. & Rogers, N.W. (1992). Paraná magmatism and the opening of the South Atlantic. In: Storey, B., Alabaster, A. & Pankhurst, R. (eds) Magmatism and the Causes of Continental Break-up. Geological Society, London, Special Publications 68, 221-240.
45. Hergt, J. M., Peate, D.W. & Hawkesworth, C. J. (1991). The petrogenesis of Mesozoic Gondwana low-Ti flood basalts. Earth and Planetary Science Letters 105, 134-148.
46. Hildreth,W., Christiansen, R. L. & O'Neil, J. R. (1984). Catastrophic isotopic modification of rhyolitic magma at times of Caldera subsidence, Yellowstone Park volcanic field. Journal of Geophysical Research 89, 8339-8369.
47. Hildreth, W., Halliday, A. N. & Christiansen, R. L. (1991). Isotopic and chemical evidence concerning the genesis and contamination of basaltic and rhyolitic magma beneath the Yellowstone Plateau Volcanic Field. Journal of Petrology 32, 63-138.
48. Irvine, T. N. & Barager,W. R. A. (1971). A guide to the chemical classification of the common volcanic rocks. Canadian Journal of Earth Science 8, 523-548.
49. Ito, E., White, E. M. & Gopel, C. (1987). The O, Sr, Nd and Pb isotope geochemistry of MORB. Chemical Geology 62, 157-176.
50. Le Maitre, R. W., Bateman, P., Dudek, A., Keller, J., Lameyre, J., Le Bas, M. J., Sabine, P. A., Schmid, R., Sorenson, H., Streckeisen, A., Woolley, A. R. & Zanettin, B. (1989). A Classification of Igneous Rocks and Glossary of Terms. Oxford: Blackwell.
51. le Roex, A. P. & Lanyon, R. (1998). Isotope and trace element geochemistry of Cretaceous Damaraland lamprophyres and carbonatites, north-western Namibia: Evidence for plume-lithosphere interactions. Journal of Petrology 39, 1117-1146.
52. le Roex, A. P., Erlank, A. J. & Needham, H. D. (1981). Geochemical and mineralogical evidence for the occurrence of at least three distinct magma types in the Famous region. Contributions to Mineralogy and Petrology 77, 24-37.
53. le Roex, A. P., Späth, A. & Zartman, R. E. (2001). Lithospheric thickness beneath the southern Kenya Rift: Implications from basalt geochemistry. Contributions to Mineralogy and Petrology 142, 86-106.
54. Lipman, P. W. & Friedman, I. (1975). Interaction of meteoric water with magma: An oxygen isotope study of ash-flow sheets from southern Nevada. Geological Society of America Bulletin 86, 695-702.
55. Mahood, G. & Hildreth, W. (1983). Large partition coefficients for trace elements in high silica rhyolites. Geochimica et Cosmochimica Acta 47, 11-30.
56. Marsh, J. S., Hooper, P.R., Rehacek, J., Duncan, R.A. & Duncan, A.R. (1997). Stratigraphy and age of Karoo basalts of Lesotho and implications for correlations within the Karoo Igneous Province. In: Mahoney, J. J. & Coffin, M. F. (eds) Large Igneous Provinces: Continental, Oceanic, Planetary Flood Volcanism. American Geophysical UnionMonograph 100, 247-272.
57. 2 gas. Geochimica et Cosmochimica Acta 58, 5255-5266.
58. McCulloch, M. T., Gregory, R. T., Wasserburg, G. J. & Taylor, H. P., Jr (1980). A neodymium, strontium, and oxygen isotope study of the Cretaceous Samail Ophiolite and implications for the petrogenesis and seawater-hydrothermal alteration of oceanic crust. Earth and Planetary Science Letters 46, 201-211.
59. McCulloch, M.T., Kyser,T. K., Woodhead, J. D. & Kinsley, L. (1994). Pb-Sr-Nd-O isotopic constraints on the origin of rhyolites from the Taupo volcanic zone of New Zealand: Evidence for assimilation followed by fractionation from basalt. Contributions to Mineralogy and Petrology 115, 303-312.
60. Milner, S. C., Duncan, A. R., Whittingham, A. M. & Ewart, A. (1995). Trans-Atlantic correlation of eruptive sequences and individual silicic volcanic units within the Paraná-Etendeka igneous province. Journal of Volcanological and Geothermal Research 69, 137-157.
61. 18O enrichment of silicic magmas caused by crystal fractionation at the Galapagos spreading centre. Contributions to Mineralogy and Petrology 79, 76-79.
62. O'Neil, J. R. & Taylor, H. P., Jr (1967). The oxygen isotope and cation exchange chemistry of feldspars. American Mineralogist 52, 1414-1437.
63. 2: An experimental study at 500-950°C and 1 bar. Geochimica et Cosmochimica Acta 60, 1963-1973.
64. Pankhurst, R. J. & Rapela, C. R. (1995). Production of Jurassic rhyolites by anatexis of the lower crust of Patagonia. Earth and Planetary Science Letters 134, 23-36.
65. Pankhurst, R. J., Riley, T. R., Fanning, C. M. & Kelley, S. R. (2000). Episodic silicic volcanism in Patagonia and the Antarctic Peninsula: chronology of magmatism associated with the break-up of Gondwana. Journal of Petrology 41, 605-625.
66. Peate, D. W., Hawkesworth, C. J. & Mantovani, M. S. M. (1992). Chemical stratigraphy of the Parana lavas (South America): Classification of magma types and their spatial distribution. Bulletin of Volcanology 55, 119-139.
67. Peccerillo, R. & Taylor, S. R. (1976). Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area, northern Turkey. Contributions to Mineralogy and Petrology 58, 63-81.
68. Piccirillo, E. M., Melfi, A., Comin-Chiaramonti, P., Bellieni, G., Ernesto, M., Marques, L. S., Nardy, A. J. R., Pacca, I. G., Roisenberg, A. & Stolfa, D. (1988). Continental flood volcanism from the Parana basin (Brazil). In: Macdougall, J. D. (ed.) Continental Flood Basalts. Dortrecht, Kluwer Academic, pp. 195-238.
69. Riley, T. R., Millar, I. L., Watkeys, M. K., Curtis, M. L., Leat, P. T., Klausen, M. B. & Fanning, C. M. (2004). U-Pb zircon (SHRIMP) ages for the Lebombo rhyolites, South Africa: Refining the duration of Karoo volcanism. Journal of the Geological Society, London 16, 547-550.
70. 2 vapour. In: Taylor, H. P., Jr, O'Neil, J. R. & Kaplan, I. (eds) Stable Isotope Geochemistry: A Tribute to Samuel Epstein. Geochemical Society Special Publication 3, 35-51.
71. Sun, S. M. & McDonough, W. F. (1989). Chemical and isotopic systematics of oceanic basalts: Implications for mantle composition and processes. In: Saunders, A. D. & Norry, M. J. (eds) Magmatism in the Ocean Basins. Geological Society, London, Special Publications 42, 313-345.
72. Sweeney, R. J. & Watkeys, M. K. (1990). A possible link between Mesozoic lithospheric architecture and Gondwana basalts. Journal of African Earth Sciences 10, 707-716.
73. Sweeney, R. J., Duncan, A. R. & Erlank, A. J. (1994). Geochemistry and petrogenesis of the Central Lebombo basalts of the Karoo Igneous Province. Journal of Petrology 35, 95-125.
74. Taylor, H. P., Jr (1977). Water/rock interactions and the origin of water in granitic batholiths. Journal of the Geological Society, London 133, 509-558.
75. 18O magmas. In: Mysen, B. D. (ed.) Magmatic Processes: Physicochemical Principles. Geochemical Society Special Publication 1, 337-357.
76. Taylor, H. P., Jr & Sheppard, S. M. F. (1986). Igneous rocks: I. Processes of isotopic fractionation and isotope systematics. In: Valley, J.W., Taylor, H. P., Jr & O'Neil, J. R. (eds) Stable Isotopes in High Temperature Geological Processes. American Society of Mineralogy, Reviews in Mineralogy 16, 227-272.
77. Thomas, J. B., Bodnar, R. J., Shimizu, N. & Sinha, A. K. (2002). Determination of zircon/melt trace element partition coefficients from SIMS analysis of melt inclusions in zircon. Geochimica et Cosmochimica Acta 66, 2887-2901.
78. 39Ar chrono-stratigraphy of pre- and syn-rift bimodal flood volcanism in Ethiopia and Yemen. Earth and Planetary Science Letters 198, 289-306.
79. Vennemann, T.W. & O'Neil, R. J. (1993). A simple and inexpensive method of hydrogen isotope and water analysis of minerals and rocks based on zinc reagent. Chemical Geology 103, 227-234.
80. Watkeys, M. K. (2002). Development of the Lebombo rifted volcanic margin of southeast Africa. In: Menzies, M. A., Klemperer, S. L. Ebinger, C. J. & Baker, J. A. (eds) Volcanic Rifted Margins. Geological Society of America, Special Papers 362, 27-46.
81. Watson, E. B. (1980). Some experimentally determined zircon/liquid partition coefficients for the rare earth elements. Geochimica et Cosmochimica Acta 44, 895-897.
82. Watson, E. B. & Harrison, M. T. (1983). Zircon saturation revisited: temperature and composition effects in a variety of crustal magma types. Earth and Planetary Science Letters 64, 295-304.
83. Wignall, P. B. (2001). Large igneous provinces and mass extinctions. Earth-Science Reviews 53, 1-33.
84. Zhao, Z. F. & Zheng, Y. F. (2003). Calculation of oxygen isotope fractionation in magmatic rocks. Chemical Geology 193, 59-80.