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Publications

Publications with data obtained from the Wits Advanced Mass Spectrometry Facility (02 Dec 2025)

(underscore indicates student/postdoc paper, * indicates corresponding author, bold indicates academic at Wits)

Published or under review

U-Pb mineral dating

  • Ludat, A. L.*, Friedrich, A. M. Aßbichler, D., Bolhar, R. & Hahn, T. (submitted to Geology) Active faulting in a seismically quiet intraplate region revealed by U–Pb calcite slicken-fibre dating
  • Bolhar, R.*, Goslin, L. & Nex, P. (submitted to Terra Nova) Hf in zircon constrains on tectonic evolution of the Damara Mobile Belt in Namibia 
  • Bolhar, R.*, Maghdour-Mashhour, R., Lorenzo, M., Mondal, S., O’Sullivan, G. J., Klemd, R., Chang, Q. (accepted) Petrogenesis of syenites at Phalaborwa, Kaapvaal Craton: (isotope) geochemical, modelling and age constraints. Chemical Geology
  • Scharf, A.*, Bolhar, R., Uysal, T. I., Mattern, F., Callegari, I., Bozkaya, G. & Baublys, K. (2025). A vein-hosted carbonate: Record of late miocene to pleistocene hydrothermal activity in the Hajar Mountains (Jabal Akhdar Dome, Sultanate of Oman). Lithos, 108104.
  • Jogee, B. A.*, Bybee, G. M., Robb, L. J., Reid, D. L., Minnaar, H., Caricchi, L.  and Bolhar, R. (2024) Assessing the geological relationships between mafic-ultramafic complexes in the Haib area and the Vuurdood Subsuite, Richtersveld Subprovince. South African Journal of Geology, 127, 55-70.
  • Head, H. V.*, Bordy, E. M. and Bolhar, R. (2024). Sedimentation tempo in an Early Jurassic erg system: Refined chronostratigraphy and provenance of the Clarens Formation of southern Africa. Basin Research, 36(3), e12877.
  • Höss, A.*, Klemd, R., Bolhar, R., Haase, K.M., Ramos, J., Geiger, E., Brandt, S. and Graupner, T. (2024) Magmatic evolution of the Schiel Alkaline Complex, Bushveld large igneous province, South Africa. Lithos, 466-467, 107464.
  • Yudovskaya, M.*, Masunte, T., Kinnaird, J.A., Mwenze, T., Ueckermann, H., Iaccheri, L., Borisovsky, S. and Bolhar, R. (2023). An extension of the Rooiberg Group and Upper Zone of the Bushveld Complex in the northernmost Waterberg segment. Precambrian Research, 399, 107228.
  • Ring, U.*, Fassoulas, C., Uysal, I. T., Bolhar, R., Tong, K. and Todd, A. (2022) Nappe imbrication within the Phyllite‐Quartzite Unit of West Crete: Implications for sustained high‐pressure metamorphism in the Hellenide Subduction Orogen, Greece. Tectonics, 41(11) e2022TC007430.
  • Tshiningayamwe, M.*, Bolhar, R. and Nex, P. A. (2022) Petrology, geochemistry and new U–Pb ages of the Epembe syenites and carbonatite, northwest Namibia. Journal of African Earth Sciences, 196, 104719.
  • Tshiningayamwe, M.*, Bolhar, R. and Nex, P. A. M. (2022). A zircon trace element and Hf isotope geochemical study of syenites and carbonatite, exemplified by the Epembe alkaline carbonatite complex, Namibia. South African Journal of Geology 2022, 125(3-4), 307-322.
  • Scharf, A.*, Mattern, F., Bolhar, R., Callegari, I., Mattern, P. and Ring, U. (2022). Oligocene/Early Miocene E/W‐Shortening in the Oman Mountains Related to Oblique Arabia‐India Convergence. Tectonics, 41(12), e2022TC007271.
  • Le Bras, L. Y.*, Milani, L., Bolhar, R. and O’Sullivan, G. (2022) Applying U-Pb chronometry and trace element geochemistry of apatite to carbonatite-phoscorite complexes–as exemplified by the 2.06 Ga Phalaborwa Complex, South Africa. South African journal of Geology, 125, 179-190.
  • Scharf, A.*, Bailey, C. M., Bolhar, R., Mattern, F. and Ring, U. (2022). Post-obductional listwaenite formation during major regional extension in the Southeastern Oman Mountains – insights from field observations and U-Pb dating. Earth and Planetary Science Letters, 5995, 117756.
  • Bolhar, R.* and Cawthorn, R. G., (2021) Zircon geochronology and geochemistry of pre- Bushveld sills in the eastern Transvaal Supergroup, South Africa. South African Journal of Geology, 125, 27-44.
  • O'Sullivan, G.J.*, Thakurdin, Y., Bolhar, R., Horváth, P., Hoare, B.C. and Collerson, K.D., (2021) The Great Falls Tectonic Zone after the assembly of Laurentia: evidence for long-term tectonic stability from xenolith apatite. Lithos, 384-385, 105977.
  • Ring, U.* and Bolhar, R. (2020). Tilting, uplift, volcanism and disintegration of the South German block. Tectonophysics, 795, 228611.

Trace element geochemistry of minerals

  • Bolhar, R.*, Poelinca, S., Bussweiler, Y., Sheikh, A., Maghdour-Mashhour, R. and Klemd, R. (submitted to Chemical Geology) Origin and evolution of carbonatite-phoscorite melts inferred from olivine in the Phalaborwa Complex, Kaapvaal Craton
  • Schapira, J.S.* and Bolhar, R. (2025) Fibrous Minerals and Naturally Occurring Asbestos (NOA) in the Metacarbonate Hosted Fe Oxide-Cu-Au-Co Mineralized Rocks from the Guelb Moghrein Mine, Akjoujt, Mauritania: Implications for In Situ Hazard Assessment and Mitigation Protocols. Minerals, 15(9), 991.
  • Pattnaik, J.*, Aulbach, S., Ghosh, S., Babu, E.V.S.S.K., Viljoen, F. and Bolhar, R. (2025). A fresh look at the physicochemical evolution of the lithospheric mantle beneath the Dharwar craton (India). Mineralogy and Petrology, 1-27.
  • Vonopartis*, L. C., Nex, P. A. M., Kinnaird, J. A., Robb, L. J. and Bolhar, R. (2025) The magmatic-hydrothermal transition recorded by trace elements in quartz: A case study from the Zaaiplaats tin field, South Africa. Mineralium Deposita, 1-20.
  • Agangi, A.*, Hofmann, A., Echigo, T., Bolhar, R., Araoka, D., Mashoene, V., Ndhlovu, L.T., Takahashi, R. & Manalo, P.C. (2025) The use of combined C-Mg isotope compositions of carbonates from orogenic SbAu deposits as a tracer of fluid interaction with sea-floor altered crust. Chemical Geology, 673, 122442.
  • Schapira, J. S.*, Bolhar, R., Master, S., & Wilson, A. H. (2023). Mineralogical, petrological and geochemical characterisation of chrysotile, amosite and crocidolite asbestos mine waste from Southern Africa in context of risk assessment and rehabilitation. Minerals, 13(10), 1352.
  • Shaikh, A.M.*, Bussweiler, Y., Viljoen, F., Bolhar, R., Ravi, S., Hezel, D.C., Ueckermann, H. and Tappe, S. (2023). Redox state of the Dharwar craton root as inferred from eclogite and peridotite sourced mantle cargo, with implications for kimberlite and lamproite magma formation. Contributions to Mineralogy and Petrology, 178(12), 86.
  • Tshiningayamwe, M.*, Bolhar, R., Nex, P. A. M., Ueckermann, H. and Chang, Q.  (2022) An apatite trace element and Sr-Nd isotope geochemical study of syenites and carbonatite, exemplified by the Epembe alkaline‑carbonatite complex, Namibia. Lithos, 420, 106699.
  • Ashwal, L. D., Ziegler, A., Glynn, S., Truebody, T. & Bolhar, R. (2021). Sr-enriched glassy picrites from the Karoo Large Igneous Province are evolved, not primitive magmatic rocks. Geochemistry, Geophysics, Geosystems, 22(4), 1-31, e2020GC009561.
  • Bolhar, R.*, Tappe, S., Wilson, A.H., Ireland, T., Avila, J. & Anhaeusser, C. (2021). A petrochronology window into near-surface fluid-rock interaction within Archaean ultramafic-mafic crust: Insights from the 3.25 Ga Stolzburg Complex, Barberton Greenstone Belt. Chemical Geology, 120130.
  • Maghdour-Mashhour, R.*, Hayes, B., Bolhar, R. and Ueckermann, H. (2021). Sill Intrusion into Pyroxenitic Mush and the Development of the Lower–Upper Critical Zone Boundary of the Bushveld Complex: Implications for the Origin of Stratiform Anorthosites and Chromitites in Layered Intrusions. Journal of Petrology, 62(1), egaa090.
  • Shaikh, A. M.*, Tappe, S., Bussweiler, Y., Patel, S. C., Ravi, S., Bolhar, R. and Viljoen, F. (2020) Clinopyroxene and Garnet Mantle Cargo in Kimberlites as Probes of Dharwar Craton Architecture and Geotherms, with Implications for Post-1· 1 Ga Lithosphere Thinning Events Beneath Southern India. Journal of Petrology, 61, 9, egaa087.
  • Wilson, A.* and Bolhar, R. (2022). Olivine in komatiite records origin and travel from the deep upper mantle. Geology, 50(3), 351-355.

Whole Rock Solution ICPMS and XRF

  • Wilson, A. H.* (2025). Deep-crustal layered mafic complexes in the Mesoproterozoic oceanic-arc of the Tugela Terrane, South Africa. Lithos, 504, 108052.
  • Wulff, K.* and Bolhar, R. (2025). Geology of the Bisie wood tin (cassiterite) deposit and its host rocks, North Kivu Province, DR Congo, DR Congo. Ore Geology Reviews, 106583.
  • Wulff, K.* and Bolhar, R. * (2025). Geochemistry of alteration and host rock lithologies to the Bisie tin deposit, North Kivu Province, DR Congo. Ore Geology Reviews, 106469.
  • Netshidzivhe, T.*, Tappe, S., Wilson, A. H., Burness, S., Wotzlaw, J. F., Strauss, H., ... & Viljoen, K. S. (2025). The 3.53 Ga St. James Volcanogenic Massive Sulfide Deposit, Kaapvaal Craton: Links to Submarine Rhyolites, Not to Komatiites. Economic Geology, 120(4), 903-924.
  • Omietimi, E.J.*, Lenhardt, N., Yang, R., Götz, A.E., Edegbai, J.A. & Bumby, A.J. (2025). Multi-parameter Investigation of Cretaceous to Palaeocene Sedimentary Sequences in the Anambra and Niger Delta Basins, Nigeria: Organic Matter Characterisation, Palynofacies, and Implications for Palaeoclimate and Sea-level changes. Geological Journal, 60, 196-222.
  • Magson J.* & Roelofse F., (2025). Nature of the Lower Critical–Upper Critical Zone transition in the Clapham trough area, eastern Bushveld Complex: evidence for the introduction of crustal fluids in response to plagioclase stabilisation? Contributions to Mineralogy and Petrology, 180:25
  • Djamilatou, D.H.*, Gountié Dedzo, M., Lenhardt, N., Tsozué, D., Asobo Nkengmatia, E.A. & Klamadji Ngarena, M. (2025). Crystallisation and petrogenesis of Cenozoic alkaline basaltic lavas on the Kapsiki Plateau (Moukoulvi, Far-North Cameroon): Unveiling the mantle's heterogeneity and HIMU signature. Solid Earth Science, 10, 100231.
  • Jogee B.*, Manzi M., Maduna N., Brodic B., Rapetsoa M., James I., Sihoyiya M., Nwaila G., Nex P., Bourdeau J. & Vonopartis L. (2025). Structure and mineralization in the Lebowa Granite Suite: Insights from high-resolution 2D reflection seismics, Ore and Energy Resource Geology.
  • Biakan à Nyotok, P.C.*, Gountié Dedzo, M., Djamilatou, D.H., Lenhardt, N., Klamadji, M.N., Fosso Tchunte, P.M. & Kamgang, P. (2024). The Subduction-Related Metavolcanic Rocks of Maroua, Northern Cameroon: New Insights into a Neoproterozoic Continental Arc Along the Northern Margin of the Central African Fold Belt. Geosciences, 14, 298.
  • Gibson, R.L.*, Wela, S.S., Vonopartis, L.C. & Andreoli, M.A. (2024). Melt breccias in parautochthonous basement rocks of the Morokweng impact structure, South Africa–Evidence for a friction origin. Journal of African Earth Sciences, 214, 105239.
  • Hayes, B.*, Ashwal, L.D., Khumalo, K., Iaccheri, L.M. (2024). Major, trace element and Sr-Nd isotope evidence for a sublithospheric mantle source for the Umkondo Large Igneous Province. Geoscience Frontiers, 15 (1), p.101719.
  • Johnson, T.D.*, Oluwajana, O.A., Omietimi, E.J., Ayo-Bali, A.E., Odondiri, O.D., Igili, C.O. & Lenhardt, N. (2024). Elemental geochemistry of Cretaceous deposits in the Dahomey Basin (Nigeria): Implications for paleoclimatic and paleoenvironmental reconstructions. Journal of African Earth Sciences, 216, 105311.
  • Khumalo, K.B.*, Ashwal, L.D., Hayes, B., Iaccheri, L.M., Meintjes, G.P., & Webb, S.J., (2024). Neoarchean lavas of the Ventersdorp large igneous province, South Africa: Sr-Nd-Hf isotope and trace element constraints on magmatic processes and mantle sources. Earth-Science Reviews, 252, 104752.
  • Keet J.J.*, Roelofse F, Gauert CDK, Iaccheri LM, Grobler DF, Ueckermann H (2024). Neodymium isotope variations in the Flatreef on Macalacaskop, northern limb, Bushveld Complex. Miner Deposita 59:275–290.
  • Omietimi, E.J.*, Lenhardt, N., Yang, R., Götz, A.E., Bumby, A.J. & Edegbai, J.A. (2024) Geochemistry of the Late Cretaceous to Paleogene sedimentary deposits of the SW Anambra Basin (Nigeria): Implications for provenance, tectonic conditions, and hydrothermal influence. Journal of African Earth Sciences, 219, 105399.
  • Siahi, M.*, Hofmann, A., Dixon, J., Wilson, A., Mayr, C., & Kapesi, L. (2024). Pongola Supergroup dolostones from the Buffalo River inlier, South Africa: facies, composition and implications for Mesoarchaean carbonate deposition. Precambrian Research, 411, 107493.
  • Tau, G. L.*, Hofmann, A., Lehmann, J., Owen-Smith, T., Pellerin, A., Thomazo, C., ... & Wilson, A. H. (2024). The Lanseria palaeosol: Implications for palaeoweathering and terrestrial life at∼ 2.6 Ga on the Kaapvaal Craton. Precambrian Research, 405, 107352
  • Bourdeau, J.E.*, Zhang, S.E., Hayes, B., Logue, A.S. & Bybee, G.M., (2023) “Evidence for the incremental assembly of the Pyroxenite Marker of the Bushveld Complex by the emplacement of crystal slurries”. Lithos, 438-439, 107007
  • Jodder, J.*, Hofmann, A., Xie, H., Elburg, M. A., & Wilson, A. (2023). Geochronology of the Daitari Greenstone Belt, Singhbhum Craton, India. Precambrian Research, 388, 106997.
  • Chagondah, G. S.*, Hofmann, A., Elburg, M. A., Iaccheri, L. M., Kramers, J. D., & Wilson, A. H. (2023). Petrogenesis of potassic granite suites along the southern margin of the Zimbabwe Craton. South African Journal of Geology 2023, 126(1), 1-28.
  • Netshidzivhe, T.*, Tappe, S., Wilson, A. H., Ishikawa, A., & Viljoen, F. (2023). The Paleoarchean Buffalo River komatiites: Progressive melting of a single large mantle plume beneath the growing Kaapvaal craton. Precambrian Research, 393, 107071.
  • Beaton K.J.*, Gibson R.L., Bybee G.M., Walker S., Diener J.F.A. & Baxter E.F. (2022). Amphibolite facies metamorphism in lower Witwatersrand Supergroup rocks exposed in the Vredefort Dome - a Ventersdorp LIP connection. South African Journal of Geology, 125, 191-210.
  • Gibson R.L.*, Wela S.S., Bybee G.M., Frei D. & Andreoli M.A.G. (2022) Granitoid gneisses of the Morokweng impact structure: implications for Neoarchaean evolution of the western Kaapvaal craton. Lithos, 426-427:106793.
  • Kruger, W.* & Latypov, R. (2022). In situ crystallization of non-cotectic and foliated igneous rocks on a magma chamber floor. Communications Earth Environments 3, 251.
  • Milani L.*, Lehmann J., Bybee, G.M., Hayes, B., Owen-Smith, T.M., Delport, J., Oosthuizen, L. & Ueckermann, H. (2022). Geochemical and geochronological constraints on the Mesoproterozoic Red Granite Suite, Kunene AMCG Complex of Angola and Namibia. Precambrian Research 379, 106821.
  • Tau, M. M.*, Bolhar, R., Wilson, A. H., & Anhaeusser, C. R. (2022). The petrogenesis and emplacement mechanism of layered ultramafic-mafic complexes of the Barberton Greenstone Belt: Insights from the Stolzburg Complex, South Africa. South African Journal of Geology 2022, 125(2), 133-166.
  • Vonopartis, L.*, Booysen, R., Nex, P., Kinnaird, J. & Robb, L. (2022). Combined satellite and portable XRF exploration mapping of the Zaaiplaats tin field, South Africa. SAJG, 125.1, 45-60.
  • Wilson, A.*, & Riganti, A. (2022). Architectural and compositional diversity of early Earth ocean floor evidenced by the Paleoarchean Nondweni greenstone belt, South Africa. Journal of Petrology, 63(11), egac108.

Whole rock isotope geochemistry

  • Magson, J.*, Roelofse, F., Bybee, G. and Bolhar, R. (2024). The Merensky-Bastard interval at Hackney, eastern Bushveld Complex: results of a combined Sr–Nd-isotopic investigation. Contributions to Mineralogy and Petrology, 179(7), 72.
  •  Magson, J.*, Roelofse, F., Bybee, G. and Bolhar, R. (2023) Constraints on the Nd-isotopic composition and nature of the last major influx of magma into the Bushveld Complex. Contributions to Mineralogy and Petrology, 178(3), 1-17. 78:14.
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