 | | Journal (article/letter/editorial) | | Article Properties of Impact-Related Pseudotachylite and Associated Shocked Zircon and Monazite in the...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 |  | 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 ~2.02Ā 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 |  | | Journal (article/letter/editorial) | | thermally metamorphosed zircon from the Vredefort impact structure, South Africa: a transmission electron...REIMOLD1)*, HUGUES LEROUX2), and ROGER L. GIBSON1) 1)Impact Cratering Research Group, School of Geosciences...Private Bag 3, P.O. Wits 2050, Johannesburg, South Africa 2)Laboratoire des Structures et PropriĆ©tĆ©s de...analysis of zircon crystals from a migmatitic pelitic granulite from the central part of the Vredefort Dome...of the ca. 250-300 km diameter Vredefort impact structure in South Africa, reveals a nanometer- to micrometer-scale |  | | Journal (article/letter/editorial) | | transport of impact evidence from cratonic interior to passive margin: Vredefort-derived shocked zircon on the...the Atlantic coast of South Africak Stephanie D. Montalvo1,2,*, Aaron J. Cavosie1,2,3, Timmons M. Erickson1...microstructures unique to hypervelocity processes. When impact craters erode, detrital shocked minerals can be...of modern alluvium at some of the largest known impact structures. However, the ultimate fate of distally...crater. In South Africa, detrital shocked minerals from the 2020 Ma Vredefort impact structure have been |  | | 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 |  | | 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, 2023Ā±4 Ma old meteorite impact structure, the extent of which closely correlates with |  | Papapavlou, K., , , Darling, J. R., Moser, D. E., Barker, I. R., White, L. F., Lightfoot, P. C., Storey, C. D., Dunlop, J. (2018) UāPb 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 Ā· J. R. Darling2...Nature 2018 Abstract Identifying and dating large impact structures is challenging, as many of the traditional...be modified by post-impact processes. Refractory accessory phases, such as zircon, while faithful recorders...respond with partial UāPb 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 |  | 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 Ā· Nicholas E. Timms1...records shock deformation from meteorite impact but the effects of impact-related microstructures on the UāThāPb...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) | | shocked metaquartzites from the Vredefort impact structure, South Africa John G. SPRAY * and Suporn BOONSUE...~30 km from the center of the 2.02 Ga Vredefort impact structure. This work focuses on deploying analytical...deep crust from 20 to 30 km depth (coesite) and impact INTRODUCTION The polymorphs of silica are of considerable...Chao et al. (1960). Coesite can be an indicator of impact, though not exclusively so, due to its occurrence...surface can only be attributed to the hypervelocity impact of asteroids or comets, where suitably high PāT |  | 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 Ā© 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 within the granophyre. Introduction Meteorite impact structures are the most important features of rocky |  | | Journal (article/letter/editorial) | | felsic and maļ¬c 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 Ā© 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 |  | Erickson, Timmons M., Cavosie, Aaron J., Moser, Desmond E., Barker, Ivan R., Radovan, Henri A., Wooden, Joe (2013) Identification and provenance determination of distally transported, Vredefort-derived shocked minerals in the Vaal River, South Africa using SEM and SHRIMP-RG techniques. Geochimica et Cosmochimica Acta, 107. 170-188 doi:10.1016/j.gca.2012.12.008 | Journal (article/letter/editorial) | | distally transported, Vredefort-derived shocked minerals in the Vaal River, South Africa using SEM and SHRIMP-RG...on Earth is incomplete due to the destruction of impact craters by erosion and burial. Shocked minerals...residing in sediments may help further document the impact record. To evaluate the survival of shocked minerals...grains from seven sites along the Vaal River in South Africa, ranging from 103 to 759 km downriver from the...the 2.020 Ga Vredefort impact structure, for the presence of detrital shocked minerals. Detailed observations |  | Kovaleva, E., Huber, M.S., Roelofse, F., Tredoux, M., Praekelt, H. (2019) Reply to the comment made by W.U. Reimold on āPseudotachylite vein hosted by a clast in the Vredefort Granophyre: characterization, origin and relevanceā 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 relevanceā 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 Ā© 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; ā¢ the quality of the geochemical...to prevent other researchers from sampling in Vredefort, while he and his co-authors are apparently not |  | | Journal (article/letter/editorial) | | INVITED REVIEW The melt rocks of the Vredefort impact structure ā 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 |  | MAMBANE, P. W., HEIN, K. A. A., TWEMLOW, S. G., MANZI, M. S. D. (2011) PSEUDOTACHYLITE IN THE SOUTH BOUNDARY FAULT AT THE COOKE SHAFT, WITWATERSRAND BASIN, SOUTH AFRICA. South African Journal of Geology, 114 (2) 109-120 doi:10.2113/gssajg.114.2.109 | Journal (article/letter/editorial) | | PSEUDOTACHYLITE IN THE SOUTH BOUNDARY FAULT AT THE COOKE SHAFT, WITWATERSRAND BASIN, SOUTH AFRICA P.W. MAMBANE...Kusasalethu Shaft, Harmony Gold Ltd, Republic of South Africa e-mail: paul.mambane@harmony.co.za K.A.A. HEIN...Johannesburg, Private Bag 3, WITS, 2050, Republic of South Africa e-mail: kim.ncube-hein@wits.ac.za S.G. TWEMLOW...Office, PO Box 2, Randfontein, 1760, Republic of South Africa e-mail: Steve.Twemlow@randuranium.co.za M.S...Republic of South Africa e-mail: Musa.Manzi@students.wits.ac.za Ā© 2011 June Geological Society of South Africa |  | | Journal (article/letter/editorial) | | USA. Meleorilics Original size of the Vredefort Structure: Implications for the geological evolution... P. 0. Wits 2050, Johannesburg, Republic of South Africa. *Correspondence author's e-mail address: atherriault@gsc...deeply eroded Vredefort impact structure within the Witwatersrand Basin, South Africa. Here, we estimate...shock metamorphic features in the floor of the structure and downfaulted Transvaal outliers. Taking erosion...km for the original final rim diameter. An impact structure of this size is expected to have had an original |  | 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) | | Revolutions in the Earth Sciences: Continental Drift, Impact and other Catastrophes by Wolf Uwe Reimold Jet...(http://photojournal.jpl.nasa.gov/catalog/PIA05578). SOUTH AFRICAN JOURNAL OF GEOLOGY, 2007, VOLUME 110 PAGES...DRIFT, IMPACT AND OTHER CATASTROPHES Revolutions in the Earth Sciences: Continental Drift, Impact and other...hu-berlin.de Ā© 2007 March Geological Society of South Africa ABSTRACT This is the story of changing paradigms...processes affecting this planet. The nature of impact cratering as a fundamental universal process and |  | | Journal (article/letter/editorial) | | thermal evolution of the Vredefort impact structure: A single-grain U-Pb zircon study R. L. GIBSON, j R...Private Bag 3, P O WITS, Johannesburg 2050, South Africa 2Research School of Earth Sciences, The Australian...heterogeneous zircon population from a small granite body in the Archean basement core of the Vredefort Dome indicate...previously reported age determinations for the Vredefort impact event. Petrographic evidence from the granite...crystallized after the impact shock event, but some doubt remains whether it is a true impact melt, a decompression |  | Moser, D.E., Davis, W.J., Reddy, S.M., Flemming, R.L., Hart, R.J. (2009) Zircon UāPb strain chronometry reveals deep impact-triggered flow. Earth and Planetary Science Letters, 277 (1) 73-79 doi:10.1016/j.epsl.2008.09.036 | Journal (article/letter/editorial) | | / l o c a t e / e p s l Zircon UāPb strain chronometry reveals deep impact-triggered ļ¬ow D.E. Moser...iThemba labs, P. Bag 11 Wits 2050, Johannesburg, South Africa b a r t i c l e i n f o Article history:...Editor: R.W. Carlson Keywords: zircon UāPb dating deformation impact planetary tectonics geochronology...EBSD a b s t r a c t Large (N 100 km) meteorite impact cratering events play important roles in surface...surface records. We have integrated benchmark UāPb zircon dating methods (ID-TIMS, SHRIMP) with new microstructural |  | | 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 |  | | 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 Ā© 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. |  | 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 theāIn Situ Formationāhypothesis. 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 āIn Situ Formationā hypothesis W...n.de Ā© 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) | | 20, 57Ā±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 |
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