 | | 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) | | 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. |  | 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 within the granophyre. Introduction Meteorite impact structures are the most important features of rocky |  | | 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) | | 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) | | 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 P–T |  | | 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 |  | 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 © 2011 June Geological Society of South Africa |  | 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 |  | Reimold, W. U., K�ber, C., Fletcher, P., Killick, A. M., Wilson, J. D. (1999) Pseudotachylitic breccias from fault zones in the Witwatersrand Basin, South Africa: evidence of autometasomatism and post-brecciation alteration processes. Mineralogy and Petrology, 66 (1) 25-53 doi:10.1007/bf01161721 | Journal (article/letter/editorial) | | from fault zones in the Witwatersrand Basin, South Africa: evidence of autometasomatism and post-brecciation...University of the Witwatersrand, Johannesburg, South Africa 2 Institute of Geochemistry, University of Vienna...Austria 3 Fochville, South Africa 4 The Mineral Corporation, Cramerview, South Africa 5 CORSTOR Pry. Ltd...Ltd, Fourways, South Africa With 12 Figures Received July 14, 1998; revised version accepted February 9...Basin in South Africa. They are particularly abundant in a zone tangential to the Vredefort Dome, a structure |  | | Journal (article/letter/editorial) | | "PSEUDOTACHYLITE IN THE SOUTH BOUNDARY EAULT ATTHE COOKE SHAET, WITWATERSRAND BASIN, SOUTH AERICA BY PW. MAMBANE...MAMBANE ET AL., SOUTH AERICAN JOURNAL OE GEOLOGY 114.2, 109-120 w.u. REIMOLD Museum für Naturkunde - Leibniz...reimold@mfn-berlin.de © 2012 June Geological Society of South AMca Mambane et al. (2011) presented a geological...occurrence of different fault rock types at the South Boundary Fault on Cooke Shaft, in the West Rand...referred as PTB) being present at that location. They state that based on the conclusion of previous research |  | | Journal (article/letter/editorial) | | allochthonous, possibly impact melt, origin of pseudotachylite from the Vredefort Dome, South Africa Daniel Lieger...Private Bag 3, P.O. Wits 2050, Johannesburg, South Africa Received 18 October 2010; accepted in revised...origin of pseudotachylite bodies formed during impact cratering include: (1) frictional heating, (2)...shock loading, (3) decompression or (4) drainage of impact melt into target rocks. In order to differentiate...composition akin to the average composition of Vredefort Granophyre dikes. Within veins, melt transport |  | | Journal (article/letter/editorial) | | deformation features and impact glass in inclusions from the Vredefort Granophyre, South Africa P. C. BUCHANAN*t...BUCHANAN*t AND W. U. REIl\IIOLD Impact Cratering Research Group, School of Geosciences, University of the Witwatersrand...Witwatersrand, Private Bag 3, WITS 2050, Johannesburg, South Africa 'Present address: Antartic Meteorite Research...revised/arm 2002 March 4) Abstract-The Vredefort Granophyre represents impact melt that was injected downward...fractures in the floor of the Vredefort impact structure, South Africa. This unit contains inclusions |  | | 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 |  | Zhao, B., Clauer, N., Robb, L. J., Zwingmann, H., Toulkeridis, T., Meyer, F. M. (1999) K-Ar dating of white micas from the Ventersdorp Contact Reef of the Witwatersrand Basin, South Africa: timing of post-depositional alteration. Mineralogy and Petrology, 66 (1) 149-170 doi:10.1007/bf01161726 | Journal (article/letter/editorial) | | Ventersdorp Contact Reef of the Witwatersrand Basin, South Africa: timing of post-depositional alteration B. Zhao...University of the Witwatersrand, Johannesburg, South Africa 2 Centre de G6ochimie de la Surface, Strasbourg...Ventersdorp Contact Reef of the Witwatersrand Basin, South Africa, were dated by the K-Ar method to constrain...of the Bushveld Complex (2060-2054 Ma) and the Vredefort catastrophism (2020 Ma), which are well-documented...Intrusion des Bushveld Komplex (2060-2054 Ma) und die Vredefort Katastrophe (2020Ma) - zwei gut dokunnentierte |  | | Journal (article/letter/editorial) | | thrust of Vredefort Event age M.C. Brink P.O. Box 6308, Baillie Park, 2526 Republic of South Africa E-mail:...University, Potchefstroom, 2520 Republic of South Africa E-mail: CHIFBW@puknet.puk.ac.za A.A. Bisschoff...Sangiro St., Potchefstroom, 2531 Republic of South Africa 1st February 2000 Abstract — A fault, designated...the Witpoortjie Fault form elements ofthe same structure. Evidence is presented why the Witpoortjie Fault...designated a thrust. Thrust faults related to the Vredefort Event are recognized mainly by their 2 Ga, post-Transvaal |  | | 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) | | 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) | | 10, 517-527 The metamorphic history of the Vredefort dome at approximately 2 Ga as revealed by coe...Survey, Private Bag X112, Pretoria, South Africa ABSTRACT The Vredefort dome (2.0Ga) represents the central...central uplift of a very large impact structure. This uplift exposed a nearly complete cross-section through...same time as the impact. The first event, so-called static metamorphism, is pre-impact and produced lithologies...geological setting immediately before impact. At the time of impact, the rocks were relatively cool and |  | | 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...Average lattice strains of 1400 microstrains in Vredefort quartz are much higher compared to values (500)...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 |  | | Journal (article/letter/editorial) | | analysis of the collar of the Vredefort Dome, South Africa— Significance for impact-related deformation and...WIELAND, Roger L. GIBSON*, and Wolf Uwe REIMOLD Impact Cratering Research Group, School of Geosciences...Private Bag 3, P.O. Wits 2050, Johannesburg, South Africa *Corresponding author. E-mail: gibsonr@geosciences...the collar of the Vredefort Dome reveals a highly heterogeneous internal structure involving folds, faults...central uplift formation during the 2.02 Ga Vredefort impact event. Broadly radially oriented symmetric |  | Corner, B., Reimold, W.U., Brandt, D., Koeberl, C. (1997) Morokweng impact structure, Northwest Province, South Africa: geophysical imaging and shock petrographic studies. Earth and Planetary Science Letters, 146 (1) 351-364 doi:10.1016/s0012-821x(96)00210-5 | Journal (article/letter/editorial) | | 1997) 3S l-364 Morokweng impact structure, Northwest Province, South Africa: geophysical imaging and...Abstract The existence of a large, near-circular, structure centred on the area around Morokweng (23”32’E/26”31’S)...(23”32’E/26”31’S) in the Northwest Province of South Africa, and possibly extending into southern Botswana, is...suggestions that this feature could represent an impact structure. Samples from an autochthonous ironstone breccia...the centre of this structure, and several samples of allochthonous quartzite from south of the central part |  | 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) | | Numerical modeling of impact heating and cooling of the Vredefort impact structure Elizabeth P. TURTLE...such as the one that created the Vredefort structure in South Africa ~2 Ga ago, result in significant...these events have important implications for post-impact metamorphism as well as for the development of...post-impact thermal evolution and the size of the Vredefort structure, we have analyzed impact-induced...thought to be appropriate for creating the Vredefort structure. When compared with the extent of estimated |  | | 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 |
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