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Publications

Here is a full list of publications by the group leader, Geoff Howarth, and the TAPP team.

Latest publication

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  1. Howarth, G. H., Kahle, B., Janney, P. E., Kahle, R., Du Plessis, A., Richardson, S. H., & Gurney, J. J. (2023). Caught in the act: Diamond growth and destruction in the continental lithosphere. Geology. https://doi.org/10.1130/G51013.1

  2. ​Fitzpayne, A., Giuliani, A., Howarth, G. H., Peters, B. J., Fehr, M. A., & Maas, R. (2023). Major-, trace-element and Sr-Nd-Hf isotope geochemistry of diamondiferous dykes from Tonguma and Koidu, Sierra Leone: Highly micaceous kimberlites formed by assimilation of metasomatised lithospheric mantle rocks. Chemical Geology, 630, 121475.

  3. Howarth, G. H., Costin, G., Peel, C., & Qashani, Z. (2023). Petrology of an apatite-calcite segregationary kimberlite from the Andriesfontein pipe, Kaapvaal craton. Lithos, 107341.

  4. Harris, C., Eriksson, S., le Roux, P., & Howarth, G. H. (2023). The relationship between δ18O values and incompatible element and radiogenic isotope enrichment in the Mashikiri nephelinites, of the Karoo LIP, southern Africa. Lithos, 454, 107278.

  5. Howarth, G. H., Marsh, J. S., Duncan, A. R., Harris, C., Heinonen, J. S., Richardson, S. H., ... & Zartman, R. E. (2023). Petrogenesis of the Tuli Basin high-Ti picrites and basalts, Karoo CFB, southern Africa: Classification, stratigraphy, emplacement, and mantle source heterogeneity. Lithos, 107040.

  6. Peel, C. J., Howarth, G. H., Day, J. M., le Roux, P., & Alard, O. (2023). Constraints on martian depleted shergottite volcanism from the petrogenesis of olivine-phyric shergottites NWA 2046 and NWA 4925. Journal of African Earth Sciences, 104901.

  7. Burgin, D. L., Scott, J. M., le Roux, P. J., Howarth, G., Palmer, M. C., Czertowicz, T. A., ... & Stirling, C. H. (2023). Rapid characterisation of Mars' mantle reservoirs by in situ laser ablation 87Sr/86Sr analysis of shocked feldspar (maskelynite). Geochimica et Cosmochimica Acta, 341, 46-61.

  8. Büttner, S. H., van Huyssteen, A., Marima, E., du Plessis, A., Tshibalanganda, M., Schmidt, C., & Howarth, G. H. (2023). The capturing and decompression of melt inclusions in olivine and ilmenite megacrysts from the Monastery kimberlite, South Africa. Gondwana Research, 115, 81-97.

  9. Sarkar, S., Giuliani, A., Phillips, D., Howarth, G. H., Ghosh, S., & Dalton, H. (2022). Sublithospheric melt input in cratonic lamproites. Geology, https://doi.org/10.1130/G50384.1

  10. Viljoen, A., Howarth, G. H., Giuliani, A., Fitzpayne, A., & Costin, G. (2022). Correlations between olivine composition and groundmass mineralogy in Sierra Leone kimberlites provide constraints on craton-specific melt-lithosphere interactions. Lithos, 106846.

  11. Howarth, G. H., Giuliani, A., Soltys, A., & Bussweiler, Y. (2022). Compositional variations in primitive kimberlite melts and entrained mantle cargo from a global survey of trace element compositions in kimberlite olivine. Journal of Petrology, 63(8), egac062.

  12. Howarth, G. H., & Nembambula, T. 2021. Petrogenesis of Kaapvaal lamproites (aka orangeites) constrained by the composition of olivine and similarities with kimberlites and other diamondiferous lamproites. Lithos, 406, 106499.

  13. Ramsey, S. R., Howarth, G. H., Udry, A., & Gross, J. 2021. Nickel–manganese variability in olivine and Al‐in‐olivine thermometry for olivine‐phyric shergottites. Meteoritics & Planetary Science, 56(8), 1597-1618.

  14. Udry, A., Howarth, G. H., Herd, C. D. K., Day, J. M., Lapen, T. J., & Filiberto, J. 2020. What martian meteorites reveal about the interior and surface of Mars. Journal of Geophysical Research: Planets, 125(12), e2020JE006523.

  15. Howarth, G. H., & Giuliani, A. 2020. Contrasting types of micaceous kimberlite-lamproite magmatism from the Man Craton (West Africa): New insights from petrography and mineral chemistry. Lithos, 105483.

  16. Howarth, G. H., & Gross, J. 2019. Diffusion-controlled and concentric growth zoning revealed by phosphorous in olivine from rapidly ascending kimberlite magma, Benfontein, South Africa. Geochimica et Cosmochimica Acta.

  17. Rahib, R. R., Udry, A., Howarth, G. H., Gross, J., Paquet, M., Combs, L. M., ... & Day, J. M. 2019. Mantle source to near-surface emplacement of enriched and intermediate poikilitic shergottites in Mars. Geochimica et Cosmochimica Acta.

  18. Combs, L. M., Udry, A., Howarth, G. H., Righter, M., Lapen, T. J., Gross, J., ... & Day, J. M. 2019. Petrology of the enriched poikilitic shergottite Northwest Africa 10169: Insight into the martian interior. Geochimica et Cosmochimica Acta.

  19. Howarth, G. H., Moore, A. E., Harris, C., van der Meer, Q. H., & le Roux, P. 2019. Crustal versus mantle origin of carbonate xenoliths from Kimberley region kimberlites using CO-Sr-Nd-Pb isotopes and trace element abundances. Geochimica et Cosmochimica Acta. https://doi.org/10.1016/j.gca.2019.03.026. 

  20. Howarth, G. H., & Büttner, S. H. 2019. New constraints on archetypal South African kimberlite petrogenesis from quenched glass-rich melt inclusions in olivine megacrysts. Gondwana Research. https://doi.org/10.1016/j.gr.2018.11.009

  21. Altunkaynak, Ş., Ünal, A., Howarth, G. H., Aldanmaz, E., & Nývlt, D. 2019. The origin of low-Ca olivine from ultramafic xenoliths and host basaltic lavas in a back-arc setting, James Ross Island, Antarctic Peninsula. Lithos, 342, 276-287.

  22. Abersteiner, A., Kamenetsky, V. S., Goemann, K., Giuliani, A., Howarth, G. H., Castillo-Oliver, M., ... & Cherry, A. 2019. Composition and emplacement of the Benfontein kimberlite sill complex (Kimberley, South Africa): Textural, petrographic and melt inclusion constraints. Lithos, 324, 297-314.

  23. Howarth, G. H. 2018. Olivine megacryst chemistry, Monastery kimberlite: Constraints on the mineralogy of the HIMU mantle reservoir in southern Africa. Lithos, 314-315, 658-668.

  24. Howarth, G. H., Udry, A., & Day, J. M. 2018. Petrogenesis of basaltic shergottite Northwest Africa 8657: Implications for fO 2 correlations and element redistribution during shock melting in shergottites. Meteoritics & Planetary Science, 53(2), 249-267.

  25. Howarth, G. H., & Harris, C. 2017. Discriminating between pyroxenite and peridotite sources for continental flood basalts (CFB) in southern Africa using olivine chemistry. Earth and Planetary Science Letters, 475, 143-151.

  26. Howarth, G. H., Day, J. M., Pernet-Fisher, J. F., Goodrich, C. A., Pearson, D. G., Luo, Y., ... & Taylor, L. A. 2017. Precious metal enrichment at low-redox in terrestrial native Fe-bearing basalts investigated using laser-ablation ICP-MS. Geochimica et Cosmochimica Acta, 203, 343-363.

  27. Udry, A., Howarth, G. H., Lapen, T. J., & Righter, M. 2017. Petrogenesis of the NWA 7320 enriched martian gabbroic shergottite: Insight into the martian crust. Geochimica et Cosmochimica Acta, 204, 1-18.

  28. Pernet-Fisher, J. F., Day, J. M., Howarth, G. H., Ryabov, V. V., & Taylor, L. A. 2017. Atmospheric outgassing and native-iron formation during carbonaceous sediment–basalt melt interactions. Earth and Planetary Science Letters, 460, 201-212.

  29. Howarth, G. H., & Udry, A. 2017. Trace elements in olivine and the petrogenesis of the intermediate, olivine‐phyric shergottite NWA 10170. Meteoritics & Planetary Science, 52(2), 391-409.

  30. Howarth, G. H., & Taylor, L. A. 2016. Multi-stage kimberlite evolution tracked in zoned olivine from the Benfontein sill, South Africa. Lithos, 262, 384-397.

  31. Jean, M. M., Taylor, L. A., Howarth, G. H., Peslier, A. H., Fedele, L., Bodnar, R. J., ... & Golovin, A. V. 2016. Olivine inclusions in Siberian diamonds and mantle xenoliths: Contrasting water and trace-element contents. Lithos. doi:10.1016/j.lithos.2016.07.023​

  32. Howarth, G.H., Liu, Y., Chen, Y., Pernet-FIsher, J.F., and Taylor, L.A. 2016. Postcrystallization metasomatism in shergottites: Evidence from the paired meteorites LAR 06319 and LAR 12011. Meteoritics and Planetary Science (Special Issue on Martian Volatiles), doi: 10.1111/maps.12576.

  33. Taylor, L. A., Logvinova, A. M., Howarth, G. H., Liu, Y., Peslier, A. H., Rossman, G. R., ... & Sobolev, N. V. 2016. Low water contents in diamond mineral inclusions: Proto-genetic origin in a dry cratonic lithosphere. Earth and Planetary Science Letters, 433, 125-132.

  34. Howarth, G.H., Pernet-Fisher, J.F., Bodnar, R.J., and Taylor, L.A. 2015. Evidence for the exsolution of Cl-rich fluids in martian magmas: Apatite petrogenesis in the enriched lherzolitic shergottite Northwest Africa 7755. Geochimica et Cosmochimica Acta, 166, 234-248.

  35. Howarth, G.H., Sobolev, N.V., Pernet-Fisher, J.F., Ketcham, R.A., Maisano,J., Pokhilenko, L.N., Taylor, D., and Taylor, L.A. 2015. 3-D X-ray tomography of diamondiferous mantle eclogite xenoliths from Siberia: A Review. Journal of Asian Earth Sciences (Invited Review), 101, 39-67.

  36. Pernet-Fisher, J.F., Howarth, G.H., Pearson, D.G., Woodland, S., Barry, P.H., Pokhilenko, N.P., Pokhilenko, L.N., Agashev, A.M., and Taylor, L.A. 2015. Plume impingement on the Siberian SCLM: Evidence from Re-Os isotope systematics. Lithos, 218-219, 141-154.

  37. Logvinova, A.M., Taylor, L.A., Fedorova, E.N., Eliseev, A.P., Wirth, R., Howarth, G.H., Reutskii, V.N., and Sobolev N.V. 2015. Unique xenolith of diamond-bearing pyrope peridotites from the Udachnaya kimberlite pipe, Yakutia: the role of subduction in diamond generation. Russian Geology and Geophysics (Geologiya i Geofizika), 56, 306-320.

  38. Barry, P.H., Hilton, D.R., Day, J.M.D., Pernet-Fisher, J.F., Howarth, G.H., Magna, T., Agashev, A.M., Pokhilenko, N.P., Pokhilenko, L.N., and Taylor, L.A. 2015. Helium isotopic evidence for modification of the cratonic lithosphere during the Permo-Triassic Siberian flood basalt event. Lithos, 216, 73-80.

  39. Pernet-Fisher, J.F., Howarth, G.H., Liu, Y., Chen, Y., and Taylor, L.A. 2014. Estimating the lunar mantle water budget from phosphates: Complications associated with silicate-liquid-immiscibility. Geochimica et Cosmochimica Acta, 144, 326-341.

  40. Howarth, G.H., Pernet-Fisher, J.F., Balta, J.B., Barry, P.B., Bodnar, R.J., and Taylor, L.A. 2014. Two-stage polybaric formation of the new enriched, pyroxene-oikocrystic, lherzolitic shergottite, NWA 7397. Meteoritics and Planetary Science, 10, 1812-1830.

  41. Howarth, G.H., Sobolev, N.V., Pernet-Fisher, J.F., Barry, P.B., Penumadu, D., Puplampu, S., Ketcham, R.A., Maisano, J.A., Taylor, D., and Taylor, L.A. 2014. The secondary origin of diamonds: multi-modal radiation tomography of diamondiferous eclogites. International Geology Reviews, 56, 1171-1180.

  42. Pernet-Fisher, J.F., Howarth, G.H., Liu, Y., Barry, P.H., Carmody, L., Valley, J.W., Bodnar, R.J., Spetsius, Z.V., and Taylor, L.A. 2014. Komsomolskaya diamondiferous eclogites: Evidence for oceanic crustal protoliths. Contributions to Mineralogy and Petrology, 167, 981-998.

  43. Howarth, G. H., Barry, P. H. Pernet-Fisher, J. F., Baziotis, I. P., Pokhilenko, N. P., Pokhilenko, L. N., Agashev, A., Bodnar, R. J., and Taylor, L. A. 2014. Superplume metasomatism: Evidence from Siberian mantle xenoliths. Lithos, 184, 209-224.

  44. Howarth, G. H. and Skinner, E. M. W. 2013. Sub-volcanic development of kimberlite pipes: Evidence from the Lace and Voorspoed (Group II) kimberlites, South Africa. Journal of Volcanology and Geothermal Research, 268, 1-16.

  45. Howarth, G. H. and Prevec, S. A. 2013. Trace Element, PGE, and Sr-Nd isotope geochemistry of the Panzhihua mafic layered intrusion, SW China: Constraints on ore-forming processes and evolution of parent magma at depth in a plumbing-system. Geochimica et Cosmochimica Acta, 120, 459-478.

  46. Howarth, G.H., Prevec, S. A. and Zhou, M-F. 2013. Timing of Ti-magnetite crystallization and silicate disequilibrium in the Panzhihua mafic layered intrusion: Implications for ore-forming processes. Lithos, 170-171, 73-89.

  47. Howarth, G. H. and Prevec, S. A. 2013. Hydration vs. oxidation: Modelling implications for Fe-Ti oxide crystallization in mafic intrusions, with specific reference to the Panzhihua intrusion, SW China. Geoscience Frontiers, Special Edition on the Panzhihua Intrusion, 4, 555-569.

  48. Ganino, C., Harris, C., Arndt, N. T., Prevec, S. A. and Howarth, G. H. 2013. Assimilation of carbonate country rock by the parent magma of the Panzhihua Fe-Ti-V deposit (SW China): Evidence from stable isotopes. Geoscience Frontiers, Special Edition on the Panzhihua Intrusion, 4, 547-554.

  49. Zhou, M-F., Chen, W. T., Wang, C. Y., Prevec, S. A., Liu, P. P., and Howarth, G.H. 2013. Two stages of immiscible liquid separation in the formation of Panzhihua-type Fe-Ti-V oxide deposits, SW China. Geoscience Frontiers, Special edition on the Panzhihua Intrusion, 4, 481-502.

  50. Howarth, G. H. and Skinner, E. M. W. 2012. The geology and emplacement of the volcaniclastic infill at the Voorspoed Group II kimberlite (orangeite) pipe, Kroonstad cluster, South Africa. Journal of Volcanology and Geothermal Research, 231-232, 24-38.

  51. Howarth, G. H.,Skinner, E. M. W., and Prevec, S.A. 2011. Petrology of the hypabyssal kimberlite of the Kroonstad Group II kimberlite (orangeite) cluster, South Africa: Evolution of the magma within the cluster. Lithos, 125, 795-808.

  52. Hanson, E. K., Moore, J. M., Bordy, E. M. Marsh, J. S., Howarth, G. and Robey, J. V. A. 2009. Cretaceous erosion in central South Africa: Evidence from upper-crustal xenoliths in kimberlite diatremes. South African Journal of Geology, 112, 125-140.

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