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Emeritus Academic Staff

Anton le Roex


My research interests lie in understanding the geochemical composition and evolution of mafic igneous rocks, their differentiates and their mantle source regions. The role of mantle plumes in the generation of intra-plate magmatism, both within oceanic and continental regions, the origin of their geochemical characteristics and their interaction with surrounding asthenospheric and overlying lithospheric mantle are fundamental foci of my research interests. Primary geographical areas of interest include the Southern Ocean, southern Africa, Madagascar and the mantle underlying Gondwanaland.


Selected Publications 

le Roex AP, Chevallier L, Verwoerd WJ and Barends R (2012) Petrology and geochemistry of Marion and Prince Edward Islands, Southern Ocean: magma chamber processes and source region characteristics.  J. Volc. Geotherm. Res 223-224, 11-18

O’Connor J, Jokat W, le Roex AP, Class C, Wijbran JR, Keßling S, Kuiper K, Nebel O (2012). Synchronous age progressive hotspot trails on the African Superswell. Nature Geoscience 5, 735-738.

le Roex AP and Class C (2014) Metasomatism of the Pan-African lithospheric mantle beneath the Damara Belt, Namibia, by the Tristan mantle plume: geochemical evidence from mantle xenoliths. Contributions to Mineralogy and Petrology 168:1046

le Roex AP, Class C (2016) Metasomatic enrichment of Proterozoic mantle south of the Kaapvaal craton, South Africa: origin of sinusoidal REE patterns in clinopyroxene and garnet. Contributions to Mineralogy and Petrology, 171:14

Cucciniello C, Melluso L, le Roex AP, Jourdan F, Morra V, de Gennaro R, Grifa C (2017) From olivine nephelinite, basanite and basalt to peralkaline trachyphonolite and comendite in the Ankaratra volcanic complex, Madagascar: 39Ar/40Ar ages, phase compositions and bulk-rock geochemical and isotopic evolution. Lithos 274, 363-382.

Nakashole A, le Roex AP, Reid DL (2020) Geochemistry and petrogenesis of the Tsirub nephelinite intrusions, southern Namibia.  J African Earth Sciences 162, 103701

le Roex AP, Tinguely C and Gregoire C (2020) Eclogite and Garnet Pyroxenite Xenoliths from Kimberlites Emplaced Along the Southern Margin of the Kaapvaal Craton, Southern Africa: Mantle or Lower Crustal Fragments? J. Petrology, 1-32, doi: 10.1093/petrology/egaa040

Ramokgaba L, le Roex AP and Robey J. (2021) Phlogopite-rich and phlogopite-poor kimberlite intrusions within the Du Toitspan kimberlite pipe, South Africa: Petrogenetic relationships and localised source heterogeneity. Lithos 390-391; 106125

Dave Reid

Precambrian Geology, Isotope Geology, Igneous Petrology, Economic Geology, Analytical Techniques, Computer Applications

Geologic evolution of the Proterozoic mobile belts in the south-western part of Africa, namely, the Namaqua and Pan-African provinces. Granitoid suites in the Namaqua Province and their associated, particularly porphyry copper-molybdenum and quartz vein hosted tungsten-molybdenum deposits. Ancient metamorphosed volcano-sedimentary exhalative Pb-Zn-Cu sulphide deposits in the Bushmanland Group (Broken Hill, Aggeneys and Gamsberg)

Petrogenesis and metallogeny of Pan-African granitoids and alkaline rocks of southern Namibia. Tertiary carbonatites in southern Namibia

Genesis of PGE mineralisation in the Bushveld Complex, with particular focus on the Northam Platinum Mine

Application of geochemical tracer techniques to problems in Archaeology, with particular focus on glass beads from Iron Age sites in Africa and Asia

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Selected Publications

Smith, D., Basson, I.J. and Reid, D.L., 2004, The normal reef sub-facies of the Merensky Reef at Northam platinum mine, Zwartklip facies, Bushveld Complex, Canadian Mineralogist 42, 243-260.

Reid, D.L., Basson, I.J., 2002, Iron-rich ultramafic pegmatite replacement bodies within the Upper Critical Zone, Rustenburg Layered Suite, Northam Platinum Mine, South Africa, Mineralogical Magazine 66, 895-914.

Saitowitz, S.J. and Reid, D.L., 2001, Early Indian Ocean glass bead trade between Egypt and Malaysia: A pilot study. Bulletin Indo-Pacific Prehistory Association, Vol 5, 119-123. Canberra, Australian National University.

Saitowitz, S.J. and Reid, D.L., 2001, Physical and chemical analysis of glass beads and glassy slag from Iron age sites in northeast Thailand: Preliminary Findings, In: Jones, M. and Sheppard, P. (Editors) Australasian connections and new directions. Proceedings of the 7th Australasian Archaeometry Conference, University of Auckland, 307-327.

Cooper, D.L., Reid, D.L., 2000, The association of potassic trachytes and carbonatites at the Dicker Willem complex, southwest Namibia: Coexisting, immiscible, but not cogenetic magmas. Contrib, Mineral. Petrol. 139, 570-583.

Cooper, D.L., Reid, D.L., 1998, Nepheline-sövites as parental magmas in carbonatite complexes: Evidence from Dicker Willem, southwest Namibia, J. Petrol. 39, 2123-2136.

Reid, D.L., Smith, C.B., Welke, H.J., Moore, J.M., 1997, Lead isotope patterns in Proterozoic stratiform base metal mineralization in the Bushmanland Group, Namaqua Province, South Africa, Econ. Geol. 92 (2), 248-258.

Reid, D.L., 1997, Sm-Nd ages and REE geochemistry of Proterozoic arc-related igneous rocks in the Richtersveld Subprovince, Namaqua Mobile Belt, Southern Africa, J. Afr. Earth Sci 24 (4), 621-633.

Reid, D.L., Rex, D.C., Brandl, G., 1997, Karoo basalts in the Ellisras sub-basin, Northern Province, S. Afr. J. Geol. 100 (2), 151-156.

Cooper, A.F., Paterson. L.A., Reid, D.L., 1995, Lithium in carbonatites: consequence of an enriched mantle source?, Min. Mag. 59, 401-408.

Reid, D.L., Smith, C.B., Watkeys, M.K., H.J. Welke, P.J. Betton, 1997, Whole rock radiometric age patterns in the Aggeneys - Gamsberg ore district, central Bushmanland, South Africa, S. Afr. J. Geol. 100 (1), 11-22.

John Rogers

Dr John Rogers was schooled in England, Northern Ireland and the Free State (Kroonstad High School)(matriculated in 1961) before undergoing voluntary navy training at Gordon's Bay, Simon's Town and Saldanha Bay in the South African Navy in 1962.  This must have sown a desire for a life on the ocean wave because, after obtaining his BSc Honours degree in Geology at the University of Cape Town in 1966, he became a founding member of UCT's Marine Geoscience Unit and mapped the seafloor between Cape Point and Knysna across the Agulhas Bank for his MSc (1971) from UCT, following this up with a PhD on the seafloor off Namaqualand and southern Namibia in 1977, also from UCT.  He then joined the Geological Survey, now the Council for Geoscience, On leaving the Geological Survey in 1982, he then rejoined UCT as a Senior Research Officer to participate in marine-geological research in the deep-ocean basins around southern Africa.​

His teaching commitments ranged from lecturing second-, third- and fourth-year geology students in the field of sedimentology, fourth-year students in marine geology and teaching first-year concepts of geology to third-year civil-engineering students.  He also led an annual, 9-day, field-geology training camp for second-year students in the southern Karoo near Laingsburg as part of a fieldwork course.  

Moving into the field of popular geology, he co-authored, in 2014, a booklet on the geology of the Tankwa Karoo National Park with Mr George Smith, a prominent geophysicist and Honorary Ranger of SANParks, now also retired from the department.

Following the 35th International Geological Congress, held in Cape Town in 2016, he authored, in 2017, a field guide to the geology of Robben Island, which is used during annual overnight trips that he leads for The Friends of the South African Museum.

His comprehensive roadside-geology book on the Cape Peninsula and its hinterland, was published by the Council for Geoscience in 2018, obtainable from the author and the publishers. In addition, he is the current Secretary of the GeoHeritage Subcommittee of the Western Cape Branch of the Geological Society of South Africa.

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Selected Publications

Rogers, J.  2018.  Geological Adventures in the Fairest Cape: Unlocking the Secrets of its Scenery.  Popular Geoscience Series of Council for Geoscience (South Africa), Pretoria, 7: 1-320.

Rogers, J.  2017.  Geological Walking Tour of Robben Island.  Field Trip Guide ODPRE05 35th International Geological Congress Cape Town 2016, 16 pp.

Rogers, J. and Smith, G.C.  2014.  Around the Tankwa Karoo National Park: A Field Guide to the Geology and Landscape.  South African National Parks Honorary Rangers (Boland) Region) and Geoheritage Subcommittee of the Western Cape Branch of the Geological Society of South Africa, 26 pp.

Rau, A., Rogers, J. and Chen, M.T., 2006, Late Quaternary palaeoceanographic record in giant piston cores off South Africa, possibly including evidence of neotectonism, Quaternary International 148, 65-77.

Rogers, J. and Rau, A.J., 2006, Surficial sediments of the wave-dominated Orange River Delta and the adjacent continental margin off south-western Africa, African Journal of Marine Science 28, 511-524.

Rogers, J., 2006, Sedimentology of Late Cenozoic sediments of the Varswater Formation in the Varswater Quarry at Langebaanweg, Western Cape Province, South Africa, African Natural History 2 (November), 192-193.

Rogers, J., 2006, Sedimentology of Late Cenozoic sediments, including the Pliocene Duynefontyn Member of the Varswater Formation, Koeberg Nuclear Power Station, Melkbosstrand, Cape Town, African Natural History 2 (November), 194-196.

Rau, A.J., Rogers, J., Lutjeharms, J.R.E., Giraudeau, J., Chen, M.T., Waelbroeck, C. and Lee-Thorp, J.A., 2002, A 450 kyr record of surface water conditions on the Agulhas Bank Slope, south of Africa, Marine Geology 180, 183-201.

 Rogers, J. and Li, X.C., 2002, Environmental impact of diamond mining on continental shelf sediments off southern Namibia, Quaternary International 92, 101-112.
Meadows, M.E., Rogers, J., Lee-Thorp, J.A., Bateman, M.D. and Dingle, R.V., 2002, Holocene chronology of a continental shelf mudbelt off southwestern Africa, The Holocene 12, 59-67.
Shaw, A.I., Holmes, P.J. and Rogers, J., 2001, Late Quaternary environmental change in the headward vicinity of Dias Beach, Cape Point, South Africa, South African Journal of Geology 104, 101-114.
Gray, C.E.D., Meadows, M.E., Lee-Thorp, J.A. and Rogers, J., 2000, Characterising the Namaqualand mudbelt of southern Africa: Chronology, palynology and palaeoenvironents, South African Geographical Journal 82, 137-142.

Rogers, J., 2000, Geotourism in the Western Cape: Of plinths and plaques, Journal of African Earth Sciences 31, 63-64.
Rogers, J., Rau, A.J. and Chen, M.T., 2000, Evidence of latitudinal fluctuations in the South Atlantic during the late Quaternary from ice-rafting detritus off the west coast of South Africa, Journal of African Earth Sciences 31, 62-63.

Andy Duncan

 Andy Duncan is a BSc (Hons) graduate of the University of Cape Town who obtained his PhD from  Victoria University of Wellington in New Zealand and then spent 2½ years as a postdoctoral research f   fellow at the Center for Volcanology in the University of Oregon (USA). He started a ten year period as a  NASA co-investigator on the Lunar Science Program during his time in Oregon and continued this when  he returned to UCT in 1972. His research focus for much of his career has been on volcanic rocks with  particular interest in the geological, volcanological, geochemical and petrogenetic aspects of the Karoo   and Etendeka flood volcanic provinces in Southern Africa. In pursuing his interest in the geochemistry of  volcanic rocks he became a practitioner in the application of a number of analytical techniques,  particularly X-Ray Fluorescence Spectrometry (XRF), in obtaining high precision trace element analyses.  As a spin-off from this engagement with sophisticated XRF techniques he presented a continuously  evolving course on the “Theory and Practice of Modern XRF Spectrometry”, in partnership with Professor  James Willis, for 30 years at UCT and over a 14-year period at the University of Western Ontario in Canada.  He developed computerised techniques for obtaining instrumental analytical data, for establishing geochemical correlation techniques between volcanic rock units using multivariate statistics, and for the simulation modelling of igneous petrogenetic processes. During the period 1995 - 2008 he was the project manager for several major high-profile and high-budget projects at UCT and finished his career at UCT as the Project Manager in the Office of the Vice-Chancellor. He also returned to his roots as an Earth Scientist in the role of Interim Chief Executive Officer of the Africa Earth Observatory Network (AEON) from 2005 - 2008.  He “retired” at the end of 2008 but has continued as a part-time project and programme manager for various projects in the Properties & Services and ICT Services Departments.

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Selected Publications

Professor Duncan has co-authored two books with Professor James Willis (See Profesor Willis' bio below) and a few of his notable publications are listed here:

Duncan, A. R., & Marsh, J. S. (2006). The Karoo Igneous Province. In M. R. Johnson, C. R. Anhaeusser & R. J. Thomas (Eds.), The Geology of South Africa (pp. 501-520). Johannesburg and Pretoria: The Geological Society of South Africa and the Council for Geoscience.

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 1: Introduction, mafic lavas and re-evaluation of mantle source components. Journal of Petrology, 45(1), 59-105.

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(1), 107-138.

Marsh, J. S., Ewart, A., Milner, S. C., Duncan, A. R., & Miller, R. M. (2001). The Etendeka Igneous Province: magma types and their stratigraphic distribution with implications for the evolution of the Parana-Etendeka flood basalt province. Bulletin of Volcanology, 62(6-7), 464-486. 

Duncan, A. R., Erlank, A. J., & Marsh, J. S. (1984). Regional geochemistry of the Karoo Igneous Province. In A. J. Erlank (Ed.), Petrogenesis of the Volcanic Rocks of the Karoo Province (Vol. Special Publication No 13, pp. 355-388). Johannesburg: Geological Society of South Africa.

Erlank, A. J., Allsopp, H. L., Duncan, A. R., & Bristow, J. W. (1980). Mantle heterogeneity beneath Southern Africa: evidence from the volcanic record. Philosophical Transactions of the Royal Society of London, A297, 295-307. 

Duncan, A. R., McKay, S. M., Stoeser, J. W., Lindstrom, M. M., Lindstrom, D. J., Fruchter, J. S., & Goles, G. G. (1975). Lunar polymict breccia 14321: a compositional study of its principal components. Geochimica et Cosmochimica Acta, 39, 247-260. 

James Willis

James Willis worked in the Departments of Geochemistry and Geological Sciences at the University of Cape Town  from 1961 to 2000, during which period he gained his Masters (with distinction) and Doctoral degrees.  He was initially employed as a research assistant rising through the ranks to Associate Professor in 1981. On his retirement from UCT in 2000 he was appointed professor emeritus in the Department of  Geological Sciences. He was a NASA co-investigator for lunar sample studies in the late 1960s and  early 1970s, a visiting scientist at the Max Planck Institüt für Chemie (Abteilung Kosmochemie),  Mainz in 1982, a member of the central committee of the South African Spectroscopic Society from  1974-1999 and its president from 1986 to 1999. He was also a council member of the South African  Coal Ash Association from 1987-1993. He was the recipient of the S.A. Spectroscopic Society’s  ARLABS Gold Medal (1986), a Geological Society of South Africa Honours Award (1992), and the  Denver X-ray Conference Birks Award (1994). He has taught courses on instrumental analytical techniques, sedimentary geochemistry, environmental geochemistry and the theory and practical aspects of geodata analysis (statistics). He initiated and co-directed a highly successful taught one-year Masters degree course in Environmental Geochemistry (six months lectures, five months dissertation) (1994-2000). Since 1974 he has directed at UCT an annual intensive two-week course on the theory and practice of XRF Spectrometry for university staff and mining and manufacturing industries. The course was also given at the Department of Geology, University of Western Ontario, London, Ontario from 1991-2005. Over the years he gained experience in many analytical techniques, including DC arc optical emission spectrometry, atomic absorption spectrophotometry, electron microprobe analysis, SEM-EDX, instrumental neutron activation analysis, ICP-AES, ICP-MS, HPIC, particle size analysis, X-ray diffraction and XRFS. He has a very broad experience in many different fields of geochemistry, including sedimentary and environmental geochemistry, meteorites, marine geochemistry, sediments, sedimentary rocks, coals and fly ash. He describes himself as a geochemist with a strong interest in the development, promotion and application of spectroscopic analytical techniques.

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Professor Willis has published three books and is currently working on a fourth:

Willis, J.P., Feather, C.E. and Turner, K., 2014, Guidelines for setting up XRF Applications, 480pp. In preparation. Due for publication in September by the authors.

Willis, J.P., Turner, K. and Pritchard, G., 2011, XRF in the Workplace, 280pp. Published by PANalytical, Australia.

Willis, J.P., 2010, XRF Sample Preparation: Glass beads by borate fusion, 58pp. Published by PANalytical B.V.,The Netherlands.

Willis, J.P. and Duncan, A.R., 2008, Understanding XRF Spectrometry, Vols 1 and 2, 628pp. Published by PANalytical B.V.,The Netherlands.