 | | Journal (article/letter/editorial) | | ORIGINAL ARTICLES. Domes in Scotland and South Africa: Arran and Vredefort. By E. B. BAILEY, M.C., B.A. XT...dealing with the Vredefort Mountain Land on the border of the Transvaal and the Orange Free State (1925). Their...Kessel near Nordlingen. The features of the Vredefort district that command most attention in this country...stratigraphical and petrographical, that are of rather more local interest. In the present notice, only one aspect...discussed, namely the tectonics of the Vredefort Dome. The Vredefort Dome is the most wonderful of its kind |  | | Book | | THE VREDEFORT MOUNTAIN LAND IN THE SOUTHERN TRANSVAAL AND THE NORTHERN ORANGE FREE STATE BY A....ASSISTANT-DIRECTOR. GEOLOGICAL SURVEY OF THE UNION OF SOUTH AFRICA AND Dr. G. A. F. MOLENGRAAFF, PROFESSOR...Physical Features Chapter 111. General 1. The Vredefort Granite 2. The Swaziland 3. 13 Geological...Rocks . IV. Metamorphism of the Rocks round the Vredefort Granite and Causes A. 113 The 115 Metamorphism... . . . 135 V 2. The Local 137 Component The Causes of the Local 3. The Order Space Component |  | | Journal (article/letter/editorial) | | GEOLOGICAL EXCURSION TO THE MINING AREAS OF SOUTH AFRICA by Aberra Mogessie, Christoph Hauzenberger...Department of Geology, University of the Free State, South Africa 1. Preface Almost a year ago Aberra Mogessie...(where we had organized past excursions) and South Africa. Having discussed the matter with Christoph...areas of South Africa. We contacted Christoph Gauert from the University of Free State, South Africa to help...help us with the local organization especially to get permission from the different mining companies to |  | | Journal (article/letter/editorial) | | temperature metamorphism in thevredefort Dome, South Africa: anticlockwise pressure-temperature path followed...Witwatersrand,PlBag 3, WITS 2050,Johannesburg, South Africa AND 7: WALLMACH Department of Geology, University...Pretoria 0002, South Africa Pelitic metasediments of the Witwatersrand Supergroup in the Vredefort Dome contain...facies metamorphism with the formation of the Vredefort Dome. Instead, it indicates that the doming event...pseudotachylite; Vredefort Dome 1. INTRODUCTION The Vredefort Dome, situated 120 km SSW of Johannesburg, South Africa |  | | Journal (article/letter/editorial) | | Genmin, P.O. Box 61820, Marshalltown, 2107, South Africa (Received November 4, 1992; revised version...biotite, pyrrhotite and arsenopyrite have more local distribution. Pelites ("shales"), quartzites, meta-conglomerates...are recorded from many gold-producing reefs. Andalusite, kyanite, garnet and/or cordierite-bearing assemblages...the collar of the Vredefort Dome. Concentric metamorphic facies around the Vredefort Dome culminate in...amphibolites of the Vredefort Dome, greenschist facies assemblages in the Vredefort collar rocks, thermal |  | | Journal (article/letter/editorial) | | Granites of Africa. 455 I V . — T H E OLD GRANITES OF THE TRANSVAAL AND or SOUTH AND CENTRAL AFRICA, by CUTHBERT...this globe to which man has penetrated ". South and Central Africa furnish no exception. Their granites,...the Old Granites of the Transvaal and South and Central Africa; to review and summarize the knowledge...deductions, the chief one being that in South and Central Africa there exists a fundamental or primary...the nucleus of the Cordilleras of the Andes of South America, but we were unable to find any record of |  | | Report (chapter) | | Bag 3, PO WITS, Johannesburg 2050, South Africa Abstract: The Vredefort Dome, the central uplifted portion...portion of the c. 300km diameter, 2.02 Ga Vredefort Impact Structure, exposes a c. 20 km deep profile through...through the crust of the Kaapvaal Craton of southern Africa which displays evidence of greenschist- to granulitefacies...metamorphic terrane in the Kaapvaal Craton (South Africa) which occurs in an intracratonic setting, spatially...Regional setting The Kaapvaal Craton of southern Africa (Fig. 1) is one of the oldest known fragments of |  | | 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...caused by continental crustal extension in a stress-free environment and the lack of deformation is probably...pseudotachylite; static metamorphism; Vredefort impact structure. INTRODUCTION The Vredefort dome, situated about 100km...clearer picture of the thermal evolution of the Vredefort dome a short time before impact, and provides |  | | Journal (article/letter/editorial) | | Sciences, University of Cape Town, Rondebosch, South Africa With 8 Figures Received August 16, 1994; accepted...the 3.07-2.71 Ga old Witwatersrand Supergroup, South Africa, a series of banded iron-formations occur. They...of the Transvaal Supergroup and the Bushveld Vredefort events. Additional thermal metamorphic overprint...overprint of the iron-formations around the Vredefort Dome caused the growth of orthoamphiboles. They show...Supergroup (2.55 Ga) und w/ihrend des Bildung der Vredefort Struktur (2.0 Ga) sind durch Altersdaten belegt |  | | Journal (article/letter/editorial) | | University of the Witwatersrand, Johannesburg, South Africa With 7 Figures Received August 13, 1998; revised...shales from three boreholes to the east and south of the Vredefort Dome is lower greenschist facies. In most...the northwestern sector of the collar of the Vredefort Dome. Several recent studies have suggested that...welche in drei Bohrkernen 6stlich und stidlich des Vredefort Domes aufgeschlossen sind. In allen untersuchten...Metamorphose in den nordwestlichen Randbereichen des Vredefort Domes. Einige neuere Studien spekulieren, dab |  | | Journal (article/letter/editorial) | | of the Vredefort Dome for the thermal and structural evolution of the Witwatersrand Basin, South Africa...University of the Witwatersrand, Johannesburg, South Africa With 5 Figures Received July 14, 1998; revised...version accepted January 26, 1999 Summary The Vredefort Dome represents an area of significant ( ~ 10...Basin. Impact-related deformation features in the Vredefort rocks facilitate the separation of metamorphic...impact event. Zusammenfassung Die Bedeutung des Vredefort-Domes fiir die thermische und strukturelle Entwicklung |  | | Journal (article/letter/editorial) | | metamorphism in the Witwatersrand Supergroup,Vredefort dome (South Africa) R.L. Gibson and W.U. Reimold, Impact...Witwatersrand, P/Bag 3, WITS, Johannesburg 2050, South Africa. E-mail 065rlg@cosmos.wits.ac.za; 065wur@cosmos...Supergroup and Dominion Group exposed in the Vredefort dome provide constraints on the age of greenschist...lower-grade overprint (M2) accompanying the 2023 ± 4 Ma Vredefort impact event. The spectra also show variable degrees...these rocks. In the centre of the basin in the Vredefort dome, however, metamorphic grades in Witwatersrand |  | | Journal (article/letter/editorial) | | the survey by Button and Tyler (1981) in southern Africa. Surfaces of lava flows in continental formations...unmetamorphosed and sericitic shales, through andalusite and siUimanite schists, to kyanite schists, and...(pre 2.0 Ga) of the Kaapvaal Craton of southern Africa (Fig. 1). Unless otherwise mentioned the data were...l , 10 Heidelberg, 11 East Rand goldfield, 12 Vredefort, 13 Johannesburg, 14 Deerdepoort, 15 Buhrmannsdrift...greenschist belt remnant southwest of Mafeking and andalusite from greenschist rocks at Mount Mar~ near Pietersburg |  | | Journal (article/letter/editorial) | | University of The Witwatersrand, Johannesburg, South Africa Abstract. Pelitic assemblages from all major...the gold fields, higher grades are indicated by andalusite and kyanite near granitoid domes and later intrusions...the Archaean and Proterozoic successions of South Africa, b enlargement of first column, to show the...away from the gold mines Neither kyanite nor andalusite have been found as regionally persistent components...of the Witwatersrand Supergroup adjacent to the south-west corner of the Johannesburg granite dome. Young |  | | Journal (article/letter/editorial) | | metamorphic grades it is accompanied by cordierite, andalusite, kyanite, or staurolite. It also grows in hydrothermal...considered to have been made on chloritoid free, or almost free, from impurities (except as noted) and in...SiO, as free quartz, 2-12; P,O 5 , 0-65. The calculations have been made omitting SiO4 as free quartz...contained quartz and other inclusions. SiOf present as free quartz was determined in the same manner as described...inclusions and is, therefore, a minimum. Rem. is SiO, as free quartz, 1506; CoO, 0-04. CaO was omitted from the |  | | Journal (article/letter/editorial) | | Fluid Inclusions in the Basement of the Vredefort Dome, South Africa: Guidelines to the Origin of the Structure*...West-Germany ABSTRACT The nearly circular, 2 b.y. old Vredefort Structure is considered to be a meteorite crater...lasting, metamorphic and magmatic evolution of the Vredefort Dome with intermittent release of CO 2 gas. However...2015 {Received 8 July 1982) ORIGIN OF THE VREDEFORT STRUCTURE 27 INTRODUCTION Palaezoic Cover Witwatersrand...map of the northwest to central portion of the Vredefort Structure, modified after Stepto (1979). Rocks |  | Robb, L. J., Charlesworth, E. G., Drennan, G. R., Gibson, R. L., Tongu, E. L. (1997) Tectono‐metamorphic setting and paragenetic sequence of Au‐U mineralisation in the Archaean Witwatersrand Basin, South Africa. Australian Journal of Earth Sciences, 44 (3) 353-371 doi:10.1080/08120099708728317 | Journal (article/letter/editorial) | | mineralisation in the Archaean Witwatersrand Basin, South Africa a a a a L. J. Robb , E. G. Charlesworth...Witwatersrand, Private Bag 3, Wits 2050, Republic of South Africa Version of record first published: 09 May 2007...mineralisation in the Archaean Witwatersrand Basin, South Africa, Australian Journal of Earth Sciences: An International...mineralisation in the Archaean Witwatersrand Basin, South Africa L. J. ROBB, E. G. CHARLESWORTH, G. R. DRENNAN...Witwatersrand, Private Bag 3, Wits 2050, Republic of South Africa. The Witwatersrand Basin is a structural remnant |  | ZHOU, T., DONG, C., PHILLIPS, G. N. (1994) Chemographic analysis of assemblages involving pyrophyllite, chloritoid, chlorite, kaolinite, kyanite, quartz: application to metapelites in the Witwatersrand goldfields, South Africa. Journal of Metamorphic Geology, 12 (5) 655-666 doi:10.1111/j.1525-1314.1994.tb00049.x | Journal (article/letter/editorial) | | metapelites in the Witwatersrand goldfields, South Africa T . ZHOU, G . D O N G A N D G . N . P H I L...upper pressure limits are constrained by the andalusite to kyanite, and the sudoite/chlol-ite to carpholite...Fe-chloritoid in all the Witwatersrand goldfields, and the local occurrence of sudoite indicate a consistent low-pressure...implying higher metamorphic grades occur in the Vredefort dome, less than 50km from the Klerksdorp goldfield...examples. His two different models give different free energy values of pyrophyllite, and the discrepancy |  | | Journal (article/letter/editorial) | | Transvaal Supergroup (central Kaapvaal craton, South Africa): implications for the tectonic setting of the...Andreoli South African Nuclear Energy Corporation, P.O. Box 582, Pretoria 0001, South Africa School of...Witwatersrand, P.O. WITS, Johannesburg 2050, South Africa e-mail: marco@necsa.co.za Antony Jamison and...Witwatersrand, P.O. WITS, Johannesburg 2050, South Africa e-mail: tjamison@hot.co.za; gibsonr@geosciences...ac.za © 2006 September Geological Society of South Africa ABSTRACT Rocks of the Palaeoproterozoic Transvaal |  | | Journal (article/letter/editorial) | | associated with the pseudotachylite of the Vredefort Dome, South Africa J,E.J. Martini Geological Surt~ey, Private...Private bag Xl12, Pretoria, South Africa Received January 29, 1990; revision accepted November 6, 1990...1990 ABSTRACT The Vredefort Dome represents the uplift centre of a well known 2.00 Ga old impact structure...unusually long time due to the magnitude of the Vredefort impact. This long time, probably about one second...realistic model to explain the origin of the Vredefort Dome. 1. Introduction The Vrcdefort Dome, a large |  | | Report (chapter) | | Downloaded from http://sp.lyellcollection.org/ at Ohio State University Library on September 16, 2012 Geological...Witwatersrand Basin, South Africa: evidence for a modified placer origin, and the role of the Vredefort impact event...02 Email alerting service click here to receive free e-mail alerts when new articles cite this article... Downloaded from http://sp.lyellcollection.org/ at Ohio State University Library on September 16, 2012 Gold mineralization...Witwatersrand Basin, South Africa: evidence for a modified placer origin, and the role of the Vredefort impact event |  | | Journal (article/letter/editorial) | | Concentration of Gold in the Early Precambrian of Southern-Africa R. P. VILJO~N*, R. SAAGER** and M. J. VILJOEN*...Geology, University of Witwatersrand, Johannesburg, South Afrika ** Vancouver, Canada The important gold...gold deposits of the early Precambrian of Southern Africa are confined to two main geologic environments...Introduction a striking and unique pattern Southern Africa is one of the largest gold provinces known on earth...sedimentary sequences of the Transvaal and Orange Free State, the second. Over the last six years the authors |  | | Journal (article/letter/editorial) | | (1916) following his work on the Vredefort Structure of South Africa. Shand described anastomosing veins... by gas-fluxing” (page 219). We now know that Vredefort is the world’s largest known impact structure...was to be known as pseudotachylyte predate the Vredefort studies. In the early nineteenth century, MacCulloch...Figure 1 Pseudotachylyte type area: Vredefort impact structure, South Africa. The quarry face intersects a...& Foote (1865, page 271), mapping in the Salem district of Madras in southeastern India, noted the presence |  | | Journal (article/letter/editorial) | | microstructures in high-grade metamorphic rocks to the solid-state adjustment of the microstructure of layered igneous...with the distinction between magmatic and solid-state deformation, the contrasting effects of deformation...major impact at 2.02 Ga that formed the Vredefort Dome in South Africa. Here peak temperatures exceeded 900±1000...cordierite to form biotite, aluminosilicate (andalusite or sillimanite) and H2O. Pattison et al. (this...for replacement of muscovite and cordierite by andalusite and biotite according to this reaction. Because |  | | Journal (article/letter/editorial) | | Sciences, University of CapeTown,Rondebosch 7700,South Africa Sir: Zhou (1994) presentspossiblepetrogenetic...petrogeneticgrid for the isochemical ky .....kyanite/andalusite (opento H20 only) FMASH system.We are, howprl...pyrophyllite, chlorite, chloritoid, and kyanite/andalusite,with only four of them being (3) 3 kin = prl...temperature but also for the immediatevicinity of the Vredefort dome. is controlledby pressure.Mg ehloritoidcanbe... Mineralization was coeval with the north to south diachronous zircons were inherited from wall rocks |
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