Discussion of “Crustal fluid contamination in the Bushveld Complex, South Africa: An analogue for subduction zone fluid migration by Benson, E., Connolly, J.A.D. and Boudreau, A.E. (2020)

References

• Benson, E., Connolly, J.A.D., and Boudreau, A.E., 2020, Crustal fluid contamination in the Bushveld Complex, South Africa: An analogue for subduction zone fluid migration: International Geology Review, p. 1–25. doihttps://doi.org/10.1080/00206814.2020.1795734.
   Google Scholar
• Boudreau, A.E., and McCallum, I.S., 1992, Concentration of platinum-group elements by magmatic fluids in layered intrusions: Economic Geology, v. 87, no. 7, p. 1830–1848. doi:https://doi.org/10.2113/gsecongeo.87.7.1830.
   Web of Science ®Google Scholar
• Cameron, E.N., 1970, Discussion of “Origin of an ultramafic pegmatoid in the eastern part of the Bushveld Complex” by Ferguson, J. and McCarthy, T. S: Geological Society South Africa Special Publication, v. 1, p. 79.
   Google Scholar
• Cameron, E.N., 1978, The Lower Zone of the eastern Bushveld Complex in the Olifants River trough: Journal of Petrology, v. 19, no. 3, p. 437–462. doi:https://doi.org/10.1093/petrology/19.3.437.
   Web of Science ®Google Scholar
• Cameron, E.N., and Desborough, G.A., 1964, Origin of certain magnetite-bearing pegmatites in the eastern part of the Bushveld Complex, South Africa: Economic Geology, v. 59, no. 2, p. 197–225. doi:https://doi.org/10.2113/gsecongeo.59.2.197.
   Google Scholar
• Clarke, B.M., Uken, R., and Reinhardt, J., 2009, Structural and compositional constraints on the emplacement of the Bushveld Complex, South Africa: Lithos, v. 111, no. 1–2, p. 21–36. doi:https://doi.org/10.1016/j.lithos.2008.11.006.
   Web of Science ®Google Scholar
• Coertze, F.J., 1958, Intrusive relationships and ore deposits in the western part of the Bushveld Igneous Complex: Transactions Geological Society South Africa, v. 61, p. 387–392.
   Google Scholar
• Ferguson, J., and McCarthy, T.S., 1970, Origin of an ultramafic pegmatoid in the eastern part of the Bushveld Complex: Geological Society South Africa Special Publication, v. 1, p. 74–79.
   Google Scholar
• Gain, S.B., 1985, The geologic setting of the platiniferous UG-2 chromitite layer on the farm Maandagshoek, eastern Bushveld Complex: Economic Geology, v. 80, no. 4, p. 925–943. doi:https://doi.org/10.2113/gsecongeo.80.4.925.
   Web of Science ®Google Scholar
• Hall, A.L., 1932, The Bushveld Igneous Complex of the central Transvaal: Geological Survey of South Africa Memoir, v. 28, p. 560.
   Google Scholar
• Harmer, R.E., and Sharpe, M.R., 1985, Field relations and strontium isotope systematics of the marginal rocks of the eastern Bushveld Complex: Economic Geology, v. 80, no. 4, p. 813–857. doi:https://doi.org/10.2113/gsecongeo.80.4.813.
   Web of Science ®Google Scholar
• Irvine, T.N., Keith, D.W., and Todd, S.G., 1983, The J-M platinum-palladium reef of the Stillwater Complex, Montana: II. Origin by double-diffusive convective magma mixing and implications for the Bushveld Complex: Economic Geology, v. 78, no. 7, p. 1287–1334. doi:https://doi.org/10.2113/gsecongeo.78.7.1287.
   Web of Science ®Google Scholar
• Kruger, F.J. (1990). The stratigraphy of the Bushveld Complex: A reappraisal and the relocation of the Main Zone boundaries. South African Journal of Geology v. 93, p. 376–381.
   Google Scholar
• Mitchell, A.A., 1990, The stratigraphy, petrography and mineralogy of the Main Zone of the northwestern Bushveld Complex: South African Journal of Geology, v. 93, p. 818–831.
   Google Scholar
• Mitchell, A.A., Eales, H.V., and Kruger, F.J., 1998, Magma replenishment processes, and the significance of poikilitic textures, near the base of the Lower Main Zone of the western Bushveld Complex, South Africa: Mineralogical Magazine, v. 62, no. 4, p. 435–450. doi:https://doi.org/10.1180/002646198547783.
   Web of Science ®Google Scholar
• Mitchell, A.A., and Manthree, R., 2002, The Giant Mottled Anorthosite: A transitional sequence at the top of the Upper Critical Zone of the Bushveld Complex, South Africa: Transactions of the Geological Society of South Africa, v. 105, no. 1, p. 15–24. doi:https://doi.org/10.2113/1050015.
   Web of Science ®Google Scholar
• Mitchell, A.A., and Scoon, R.N., 1991, Discussion on ‘The stratigraphy of the Bushveld Complex: A reappraisal and the relocation of the Main Zone boundaries: South African Journal of Geology, v. 94, p. 183–187.
   Google Scholar
• Mitchell, A.A., and Scoon, R.N., 2007, The Merensky reef at Winnaarshoek, Eastern Bushveld Complex: A primary magmatic hypothesis based on a wide reef facies: Economic Geology, v. 102, no. 5, p. 971–1009. doi:https://doi.org/10.2113/gsecongeo.102.5.971.
   Web of Science ®Google Scholar
• Mitchell, A.A., and Scoon, R.N., 2012, The Platreef of the Bushveld Complex, South Africa: A model of multiple, non-sequential magma replenishment based on observations at the Akanani Project: South African Journal of Geology, v. 115, no. 4, p. 535–550. doi:https://doi.org/10.2113/gssajg.115.4.535.
   Web of Science ®Google Scholar
• Mitchell, A.A., Scoon, R.N., and Sharpe, M.R., 2019, The Upper Critical Zone in the Swartklip Sector, north-western Bushveld Complex, on the farm Wilgerspruit 2JQ: II. Origin by intrusion of ultramafic sills with concomitant partial melting of host norite-anorthosite cumulates: South African Journal of Geology, v. 122, no. 2, p. 143–162. doi:https://doi.org/10.25131/sajg.122.0011.
   Web of Science ®Google Scholar
• Molyneux, T.G., 1970, The geology of the area in the vicinity of Magnet Heights, Eastern Transvaal, with special reference to the magnetic iron ore: Special Publication of the Geological Society of South Africa, v. 1, p. 228–241.
   Google Scholar
• Schwellnus, J.S.I., Engelbrecht, L.N.J., Coertze, F.J., Russell, M.D., Maherbe, S.J., Van Rooyen, D.P., and Cooke, R., 1962, The geology of the Olifants River area, Transvaal: Geological Survey of South Africa Explanation Sheets 2429B and 2430A, 87 p.
   Google Scholar
• Scoon, R.N., 1994, Comment on “Compositional convection in a reactive crystalline mush and melt differentiation” by Tait, S., and Jaupart, C: Journal of Geophysical Research, v. 99, no. B6, p. 913–11,917. doi:https://doi.org/10.1029/93JB02664.
   Web of Science ®Google Scholar
• Scoon, R.N., 2002, A new occurrence of Merensky Reef on the flanks of the Zaaikloof dome, northeastern Bushveld Complex: Relationship between diapirism and magma replenishment: Economic Geology, v. 97, no. 5, p. 1037–1049. doi:https://doi.org/10.2113/gsecongeo.97.5.1037.
   Web of Science ®Google Scholar
• Scoon, R.N., Costin, G., and Grabe, P.-J., 2017, Geology and origin of the vanadiferous Fe-Ti oxide-rich Kennedy’s Vale discordant body, Eastern Limb of the Bushveld Complex, South Africa: South African Journal of Geology, v. 120, no. 2, p. 251–270. doi:https://doi.org/10.25131/gssajg.120.2.251.
   Web of Science ®Google Scholar
• Scoon, R.N. and Eales, H.V. (2002). Unusual Fe-Ti-Cr spinels from discordant bodies of iron-rich ultramafic pegmatite at the Amandelbult Platinum mine, northwestern Bushveld Complex. Mineralogical Magazine v. 66, p. 857–879.
   Web of Science ®Google Scholar
• Scoon, R.N., and Mitchell, A.A., 1994, Discordant iron-rich ultramafic pegmatites in the Bushveld Complex and their relationship to iron-rich intercumulus and residual liquids: Journal of Petrology, v. 35, no. 4, p. 881–917. doi:https://doi.org/10.1093/petrology/35.4.881.
   Web of Science ®Google Scholar
• Scoon, R.N., and Mitchell, A.A., 2004, Petrogenesis of discordant magnesian dunites from the central sector of the Eastern Bushveld Complex with emphasis on the Winnaarshoek pipe and disruption of the Merensky Reef: Economic Geology, v. 99, no. 3, p. 517–541. doi:https://doi.org/10.2113/gsecongeo.99.3.517.
   Web of Science ®Google Scholar
• Scoon, R.N., and Mitchell, A.A., 2009, A multi-stage orthomagmatic and partial melting hypothesis for the Driekop platiniferous dunite pipe, eastern limb of the Bushveld Complex, South Africa: South African Journal of Geology, v. 112, no. 2, p. 187–196. doi:https://doi.org/10.2113/gssajg.112.2.163.
   Web of Science ®Google Scholar
• Scoon, R.N., and Mitchell, A.A., 2010, The principal geological features of the Onverwacht platiniferous dunite pipe, eastern limb of the Bushveld Complex, South Africa: South African Journal of Geology, v. 113, no. 2, p. 155–168. doi:https://doi.org/10.2113/gssajg.113.2.155.
   Web of Science ®Google Scholar
• Scoon, R.N., and Mitchell, A.A., 2011, The principal geological features of the Mooihoek platiniferous dunite pipe, eastern limb of the Bushveld Complex, South Africa, and similarities with Replaced Merensky Reef at the Amandelbult mine: South African Journal of Geology, v. 114, no. 1, p. 15–40. doi:https://doi.org/10.2113/gssajg.114.1.15.
   Google Scholar
• Scoon, R.N., and Mitchell, A.A., 2012, The Upper Zone of the Bushveld Complex at Roossenekal: Geochemical Stratigraphy and Evidence of Multiple Episodes of Magma Replenishment: South African Journal of Geology, v. 115, no. 4, p. 515–534. doi:https://doi.org/10.2113/gssajg.115.4.515.
   Web of Science ®Google Scholar
• Scoon, R.N. and Viljoen, M.J. (2019). Geoheritage of the Eastern Limb of the Bushveld Igneous Complex, South Africa-a uniquely exposed layered igneous intrusion. Geoheritage v. 11(4), p. 1723–1748. doi:https://doi.org/10.1007/s12371-019-0036-7
   Google Scholar
• Sharpe, M.R., 1981, The chronology of magma influxes to the eastern compartment of the Bushveld Complex as exemplified by its marginal border groups: Geological Society of London Journal, v. 138, no. 3, p. 307–326. doi:https://doi.org/10.1144/gsjgs.138.3.0307.
   Google Scholar
• Sharpe, M.R., 1985, Strontium isotope evidence for preserved density stratification in the eastern Bushveld Complex: Nature, v. 316, no. 6024, p. 119–126. doi:https://doi.org/10.1038/316119a0.
   Web of Science ®Google Scholar
• South African Committee for Stratigraphy, 1980, Stratigraphy of South Africa, Part I, in Kent, L.E., ed., Geological Survey of South Africa Handbook 8, p. 690. Geological Survey of South Africa.
   Google Scholar
• Truter, F.C., 1955, Modern concepts of the Bushveld Igneous Complex, in First Meeting Southern Regional Committee for Geology (CCTA): Harare, Zimbabwe, p. 77–91.
   Google Scholar
• Uken, R., and Watkeys, M.K., 1997, Diapirism initiated by the Bushveld Complex: Geology, v. 25, no. 8, p. 723–726. doi:https://doi.org/10.1130/0091-7613(1997)025<0723:DIBTBC>2.3.CO;2.
   Web of Science ®Google Scholar
• Viljoen, M.J., and Scoon, R.N., 1985, The distribution and main geologic features of discordant bodies of iron-rich ultramafic pegmatite in the Bushveld Complex: Economic Geology, v. 80, no. 4, p. 1109–1128. doi:https://doi.org/10.2113/gsecongeo.80.4.1109.
   Web of Science ®Google Scholar
• Wager, L.R., and Brown, G.M., 1968, Layered igneous rocks: Edinburgh, Oliver and Boyd, p. 588. Edinburgh.
   Google Scholar
• Wagner, P.A., 1925, The danger of generalizations: Economic Geology, v. 1, p. 281–285.
   Google Scholar
• Wagner, P.A., 1926, Recent discussion on the origin of the Bushveld platinum deposits: Transactions of the Geological Society of South Africa, v. 29, p. 145–147.
   Google Scholar
• Wagner, P.A., 1929, The platinum deposits and mines of South Africa: Edinburgh, Oliver, and Boyd, p. 326. Edinburgh.
   Google Scholar
• Willemse, J., 1969, The geology of the Bushveld Igneous Complex, the largest repository of magmatic ore deposits in the World: Economic Geology Monograph, v. 4, p. 1–22.
   Google Scholar