 | Kovaleva, E., Huber, M.S., Roelofse, F., Tredoux, M., Praekelt, H. (2018) Pseudotachylite vein hosted by a clast in the Vredefort Granophyre: characterization, origin and relevance. South African Journal of Geology, 121 (1) 51-68 doi:10.25131/sajg.121.0002 | Journal (article/letter/editorial) | | Pseudotachylite vein hosted by a clast in the Vredefort Granophyre: characterization, origin and relevance...University of the Free State, 205 Nelson Mandela Drive, 9300 Bloemfontein, South Africa e-mail: kovalevae@ufs...praekehe@ufs.ac.za © 2018 March Geological Society of South Africa Abstract A small, meta-granitic clast with...microcrystalline vein was found enclosed within the Vredefort Granophyre. Semi-quantitative chemical analyses...vein representing pseudotachylite derived from granite. Within the granitic clast, evidence of high-grade |  | | Journal (article/letter/editorial) | | felsic and mafic rocks from the Vredefort impact structure, South Africa. Implications for the experimental...University of the Free State, 205 Nelson Mandela Drive, 9300 Bloemfontein, South Africa e-mail: kovalevae@ufs...University of the Free State, 205 Nelson Mandela Drive, 9300 Bloemfontein, South Africa e-mail: fouriefd@ufs...ac.at © 2018 December Geological Society of South Africa Abstract While the formation of tectonic PTs...for all rock types, the mechanism of formation of impact-related pseudotachylites (PTs) is strongly debated |  | | Journal (article/letter/editorial) | | minerals Article Properties of Impact-Related Pseudotachylite and Associated Shocked Zircon and Monazite...Upper Levels of a Large Impact Basin: A Case Study from the Vredefort Impact Structure Elizaveta Kovaleva...of Geology, University of the Free State, Bloemfontein 9300, South Africa Department of Geology, University...University of Pretoria, Pretoria 0028, South Africa Correspondence: kovalevae@ufs.ac.za; Tel.: +27-51-401-9257... Abstract: The Vredefort impact structure in South Africa is deeply eroded to its lowermost |  | | Journal (article/letter/editorial) | | shock-induced pseudotachylites, Vredefort impact structure, South Africa Elizaveta Kovaleva, Matthew S...shock-induced pseudotachylites, Vredefort impact structure, South Africa, LITHOS (2020), https://doi.org/10...shock-induced pseudotachylites, Vredefort impact structure, South Africa Elizaveta Kovalevaa,* kovalevae@ufs...University of the Free State, 205 Nelson Mandela Drive, 9300 Bloemfontein, South Africa b ur na lP ...of Pretoria, 0028 Pretoria, South Africa Journal Pre-proof ABSTRACT Impact-generated pseudotachylites |  | | Journal (article/letter/editorial) | | dyke and surrounding host rocks, Vredefort impact structure, South Africa F. D. FOURIE 1* , M. S. HUBER...University of the Free State, 205 Nelson Mandela Drive, 9300 Bloemfontein, South Africa 2 Department of...University of the Free State, 205 Nelson Mandela Drive, 9300 Bloemfontein, South Africa * Corresponding...central part of the Vredefort impact structure are believed to be the remnants of the impact melt sheet, which...relates to the formation and modification of large impact structures. We conducted magnetic and resistivity |  | Rajesh, H.M., Knoper, M.W., Belyanin, G.A., Safonov, O.G., Schmidt, C. (2020) Petalite postdating spodumene in pegmatite as a consequence of the ~2.02 Ga meteorite impact in the Vredefort structure, southern Africa. Lithos, 376. 105760pp. doi:10.1016/j.lithos.2020.105760 | Journal (article/letter/editorial) | | of the ~2.02 Ga meteorite impact in the Vredefort structure, southern Africa H.M. Rajesh, M.W. Knoper...of the ~2.02 Ga meteorite impact in the Vredefort structure, southern Africa, LITHOS (2020), https://doi...of the ~2.02 Ga meteorite impact in the Vredefort structure, southern Africa H.M. Rajesh1*, M.W. Knoper2...Department of Geology, University of Johannesburg, South Africa 3 Korzhinskii Institute of Experimental Mineralogy...Petrology and Volcanology, Geological Faculty, Moscow State University, Russia 5 GFZ German Research Centre |  | Reimold, Wolf Uwe, Hauser, Natalia, Hansen, Bent T., Thirlwall, Matthew, Hoffmann, Marie (2017) The impact pseudotachylitic breccia controversy: Insights from first isotope analysis of Vredefort impact-generated melt rocks. Geochimica et Cosmochimica Acta, 214. 266-281 doi:10.1016/j.gca.2017.07.040 | Journal (article/letter/editorial) | | The Impact Pseudotachylitic Breccia Controversy: Insights from First Isotope Analysis of Vredefort Impact-Generated...The Impact Pseudotachylitic Breccia Controversy: Insights from First Isotope Analysis of Vredefort Impact-Generated... The Impact Pseudotachylitic Breccia Controversy: Insights from First Isotope Analysis of Vredefort Impact-Generated...reimold@mfn-berlin.de ABSTRACT Besides impact melt rock, several large terrestrial impact structures, notably the Sudbury...Sudbury (Canada) and Vredefort (South Africa) structures, exhibit considerable occurrences of a second |  | | Journal (article/letter/editorial) | | pseudotachylitic breccias in the central uplifts of very large impact structures: Scaling the melt formation Tanja MOHR-WESTHEIDE*...occurrences of pseudotachylitic breccia (PTB) in impact structures have been strongly debated for decades...these processes; or (5) intrusion of allochthonous impact melt from a coherent melt body has been advocated...meter-sized occurrences from the type location, the Vredefort Dome. This complex Archean to early Proterozoic...the originally >250 km diameter Vredefort impact structure in South Africa. Previously, results of microstructural |  | Reimold, W.U., Hoffmann, M., Hauser, N., Schmitt, R-T., Zaag, P.T., Mohr-Westerheide, T. (2016) A geochemical contribution to the discussion about the genesis of impact-related pseudotachylitic breccias: Studies of PTB in the Otavi and Kudu Quarries of the Vredefort Dome support the“In Situ Formation”hypothesis. South African Journal of Geology, 119 (3) 453-472 doi:10.2113/gssajg.119.3.453 | Journal (article/letter/editorial) | | contribution to the discussion about the genesis of impact-related pseudotachylitic breccias: Studies of PTB...PTB in the Otavi and Kudu Quarries of the Vredefort Dome support the “In Situ Formation” hypothesis W...n.de © 2016 September Geological Society of South Africa Abstract This work is aimed at contributing...formation of massive pseudotachylitic breccias (PTB) in impact structures. In the past this has been debated as...combination of injection of impact melt from a higher level of the impact structure plus assimilation of other |  | | Journal (article/letter/editorial) | | INVITED REVIEW The melt rocks of the Vredefort impact structure – Vredefort Granophyre and pseudotachylitic...pseudotachylitic breccias: Implications for impact cratering and the evolution of the Witwatersrand Basin Wolf Uwe Reimold...Reimold,1, Roger L. Gibson Impact Cratering Research Group, School of Geosciences, University of the...Private Bag 3, P.O. Wits 2050, Johannesburg, South Africa Received 22 February 2005; accepted 26 July...the Vredefort impact structure in South Africa an exceptional laboratory for the study of impact-related |  | Erickson, Timmons M., Timms, Nicholas E., Kirkland, Christopher L., Tohver, Eric, Cavosie, Aaron J., Pearce, Mark A., Reddy, Steven M. (2017) Shocked monazite chronometry: integrating microstructural and in situ isotopic age data for determining precise impact ages. Contributions to Mineralogy and Petrology, 172 (2) doi:10.1007/s00410-017-1328-2 | Journal (article/letter/editorial) | | situ isotopic age data for determining precise impact ages Timmons M. Erickson1 · Nicholas E. Timms1...records shock deformation from meteorite impact but the effects of impact-related microstructures on the U–Th–Pb...the Vredefort impact structure, South Africa, and impact melt from the Araguainha impact structure, Brazil...orientation mapping of monazite grains from both impact structures reveals a similar combination of crystal-plastic...granular monazite domains are strain-free, having grown during the impact events via consumption of strained |  | | Journal (article/letter/editorial) | | central uplift formation in the Vredefort impact structure, South Africa Daniel Lieger a, Ulrich Riller...Street West, Hamilton, Ontario, Canada L8S 4K1 Impact Cratering Research Group, School of Geosciences...Private Bag 3, P.O. Wits 2050, Johannesburg, South Africa a r t i c l e i n f o Article history: Received...Keywords: impact cratering central uplift pseudotachylite deformation Vredefort impact structure a b s...underlying the central portions of large terrestrial impact structures are characterized by the pervasive presence |  | | Journal (article/letter/editorial) | | coarsecrystalline veins within Vredefort Granophyre, Vredefort impact structure, South Africa E. Kovaleva and M.S...University of the Free State, 205 Nelson Mandela Drive, Bloemfontein 9300, South Africa e-mail: kovalevae@ufs...2018 December Geological Society of South Africa Abstract Vredefort Granophyre dykes are generally considered...part of impact melt, which intruded downward from the melt sheet of the Vredefort impact structure (South...(South Africa). This work reports enigmatic textural inhomogeneities found within the Daskop and southeast |  | Papapavlou, K., , , Darling, J. R., Moser, D. E., Barker, I. R., White, L. F., Lightfoot, P. C., Storey, C. D., Dunlop, J. (2018) U–Pb isotopic dating of titanite microstructures: potential implications for the chronology and identification of large impact structures. Contributions to Mineralogy and Petrology, 173 (10) doi:10.1007/s00410-018-1511-0 | Journal (article/letter/editorial) | | for the chronology and identification of large impact structures K. Papapavlou1 J. Dunlop2 · J. R. Darling2...Nature 2018 Abstract Identifying and dating large impact structures is challenging, as many of the traditional...shock indicator phases can be modified by post-impact processes. Refractory accessory phases, such as...respond with partial U–Pb age resetting during impact events. Titanite is an accessory phase with lower...but its potential as indicator and chronometer of impact-related processes remains poorly constrained. In |  | | Journal (article/letter/editorial) | | of the Vredefort Dome for the thermal and structural evolution of the Witwatersrand Basin, South Africa...Africa R. L. Gibson and W. U. Reimold Impact Cratering Research Group, Department of Geology, University of...of the Witwatersrand, Johannesburg, South Africa With 5 Figures Received July 14, 1998; revised version...version accepted January 26, 1999 Summary The Vredefort Dome represents an area of significant ( ~ 10 kin)...250-300 km diameter, 2023±4 Ma old meteorite impact structure, the extent of which closely correlates with |  | | Journal (article/letter/editorial) | | observations on shatter cones in the Vredefort impact structure, South Africa, and evaluation of current hypotheses...Private Bag 3, P.O. Wits 2050, Johannesburg, South Africa 2Museum for Natural History (Mineralogy), Humboldt...Abstract–Shatter cones have been described from many meteorite impact structures and are widely regarded as a diagnostic...diagnostic macroscopic recognition feature for impact. However, the origin of this meso- to macroscopic striated...studies of shatter cones from the Vredefort impact structure and other impact structures are discussed in the |  | | Journal (article/letter/editorial) | | 20, 57±70 Impact-induced melting of Archean granulites in the Vredefort Dome, South Africa. I: anatexis...Private Bag 3, P O WITS, Johannesburg 2050, South Africa (065rlg@cosmos.wits.ac.za) ABSTRACT Mid-crustal...Mid-crustal Archean pelitic granulites in the Vredefort Dome experienced a static, low-P granulite facies...associated with the formation of the dome by meteorite impact at 2.02 Ga. Heating and exhumation were virtually...energy released from nonadiabatic decay of the impact shock wave. Maximum temperatures within a radius |  | Kovaleva, E., Huber, M.S., Roelofse, F., Tredoux, M., Praekelt, H. (2019) Reply to the comment made by W.U. Reimold on “Pseudotachylite vein hosted by a clast in the Vredefort Granophyre: characterization, origin and relevance” by E. Kovaleva et al., South African Journal of Geology, 2018, 121, 51-68. doi:10.25131/sajg.121.0002. South African Journal of Geology, 122 (1) 109-115 doi:10.25131/sajg.122.0006 | Journal (article/letter/editorial) | | in the Vredefort Granophyre: characterization, origin and relevance” by E. Kovaleva et al., South African...University of the Free State, 205 Nelson Mandela Drive, 9300 Bloemfontein, South Africa e-mail: kovalevae@ufs...praekehe@ufs.ac.za © 2019 March Geological Society of South Africa The comments on our paper (Kovaleva et al....of the sample used, in terms of the proposed Vredefort World Heritage Site; • the quality of the geochemical...to prevent other researchers from sampling in Vredefort, while he and his co-authors are apparently not |  | O’Callaghan, J. W., Osinski, G. R., Lightfoot, P. C., Linnen, R. L., Weirich, J. R. (2016) Reconstructing the Geochemical Signature of Sudbury Breccia, Ontario, Canada: Implications for Its Formation and Trace Metal Content. Economic Geology, 111 (7) 1705-1729 doi:10.2113/econgeo.111.7.1705 | Journal (article/letter/editorial) | | 85719-2395 Abstract The Sudbury breccia is an impact-generated pseudotachylitic breccia formed in the...target rocks, and/or (3) injection of allochthonous impact melt from the Sudbury Igneous Complex into the...from six different locations around the Sudbury structure. A mixing model was used to construct the composition...with no requirement for a contribution from the impact melt sheet. Instead, we propose a dynamic, parautochthonous...described by Shand (1916) in the Vredefort impact structure, South Africa, as a rock that originated by |  | | Journal (article/letter/editorial) | | a constraint on the size of the Vredefort impact crater, South Africa Sybrand de Waal Centre for Research...Department of Geology, University of Pretoria, South Africa Current address: PO Box 21167, Windhoek, Namibia...heimat@iway.na © 2008 September Geological Society of South Africa ABSTRACT The volcanic Roodekraal Complex, situated...40 km from the proposed center of the ~2.02 Ga Vredefort cratering event, overlies the rocks of the Pretoria...as such constrains the size of the transient Vredefort crater to a maximum of ca. 80 km in diameter. |  | | Journal (article/letter/editorial) | | STABLE ISOTOPE EVIDENCE FOR IMPACT-RELATED PSEUDOTACHYLITE FORMATION AT VREDEFORT BY LOCAL MELTING OF DRY...Sciences, University of Cape Town, Rondebosch 7701, South Africa e-mail: chris.harris@uct.ac.za D.S. FOURIE...Sciences, University of Cape Town, Rondebosch 7701, South Africa e-mail: duanefourie@gmail.com A. FAGERENG Department...7701, South Africa e-mail: ake.fagereng@uct.ac.za © 2013 June Geological Society of South Africa ABSTRACT...water content of impact-related granophyre, and pseudotachylite, from various Vredefort Dome localities |  | | Journal (article/letter/editorial) | | The age and thermal evolution of the Vredefort impact structure: A single-grain U-Pb zircon study R....Private Bag 3, P O WITS, Johannesburg 2050, South Africa 2Research School of Earth Sciences, The Australian...population from a small granite body in the Archean basement core of the Vredefort Dome indicate an age...age of 2017 _+ 5 Ma for the granite, which is identical, within errors, to the previously reported age determinations...determinations for the Vredefort impact event. Petrographic evidence from the granite indicates that it crystallized |  | Muundjua, Manfriedt, Galdeano, Armand, Carporzen, Laurent, Gilder, Stuart A., Hart, Rodger J., Andreoli, Marco A.G., Tredoux, Marian (2008) Reply to comment by W.U. Reimold, R.L. Gibson, and H. Henkel on Muundjua et al. (2007), “Magnetic imaging of the Vredefort impact crater, South Africa”, EPSL 261, pp 456–468. Earth and Planetary Science Letters, 273 (3) 397-399 doi:10.1016/j.epsl.2008.06.044 | Journal (article/letter/editorial) | | (2007), “Magnetic imaging of the Vredefort impact crater, South Africa”, EPSL 261, pp 456–468 Muundjua...magnetic anomalies associated with the Vredefort meteorite impact crater. In their comment, Reimold et...contribution on impact-related magnetism and on the “crust-on-edge” model of the Vredefort structure. merely...full field days within the central uplift area (Vredefort dome). The statistics of the data set are as follows:...Verwey transitions in the Vredefort rocks is a first, not only for Vredefort, but for any crystalline rock |  | Machado, R., Lana, C., Stevens, G., Filho, C.R.S., Reimold, W.U., McDonald, Iain (2009) Generation, mobilization and crystallization of impact-induced alkali-rich melts in granitic target rocks: Evidence from the Araguainha impact structure, central Brazil. Geochimica et Cosmochimica Acta, 73 (23) 7183-7201 doi:10.1016/j.gca.2009.08.029 | Journal (article/letter/editorial) | | of impact-induced alkali-rich melts in granitic target rocks: Evidence from the Araguainha impact structure...Stellenbosch, Private Bag XI, 7602 Stellenbosch, South Africa b Departamento de Geologia e Recursos Naturais...crystallization of clast-laden impact melt rocks from the Araguainha impact structure, central Brazil. Despite...only from the target granite. The melt rocks occur in the form of a massive impact melt sheet overlying...overlying the eroded central uplift structure, and as melt veins in the granite of the core of the central uplift |  | | Journal (article/letter/editorial) | | high stress in quartz from the impact site of Vredefort, South Africa KAI CHEN1, MARTIN KUNZ2, NOBUMICHI...stishovite-bearing quartzite from the Vredefort meteorite impact site in South Africa reveals features that are attributed...microstrains in Vredefort quartz are much higher compared to values (500) found in quartz from granite samples...compressive and tensile residual stresses, in Vredefort quartz, shear stresses associated with lamellar...lamellar boundaries dominate. Key-words: Vredefort impact site, quartz, Dauphiné twinning, residual stress |
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