 | | Journal (article/letter/editorial) | | GENESIS OF THE IRON ORES OF THE PRETORIA SOUTH HARTMUT SERIES, AFRICA SCHWEIGART CONTENTS PAGE Abstract............................... SouthernArea (Potchefstroom) ...................................... 276...of onkolithsor stromatoliths IRON ORES OF SOUTH AFRICA 271 are onkolitesor stromatolites (31); and...precipitated marine sediments, IRON ORES OF SOUTH AFRICA 273 theiron-bearing solutions beingof continental...2 MAIN IRON ORE RESERVES OF THE REPUBLIC OF SOUTH AFRICA Oregrade high low Fe-oontentReserves in 106tons |  | | Journal (article/letter/editorial) | | Sciences, University of Cape Town, Rondebosch, South Africa With 8 Figures Received August 16, 1994; accepted...Summary In the West Rand Group of the 3.07-2.71 Ga old Witwatersrand Supergroup, South Africa, a series of...not by some external source. Zusammenfassung Die West Rand Group innerhalb der 3.07-2.71 Milliarden Jahre...sulphur fugacity. In iron-formation horizons of the West Rand Group (Eriksson et al., 1981; Tankard et al...mineral chemical data on some iron-formation of the West Rand Group, and to discuss the geological implications |  | de Waal, S., Schweitzer, J.-K., Graham, I., Gauert, C., Ripley, E. (2008) A Bushveld-related high-Ti igneous suite (HITIS) derived from an alkali to transitional basaltic magma, South Africa. South African Journal of Geology, 111 (2) 201-224 doi:10.2113/gssajg.111.2-3.201 | Journal (article/letter/editorial) | | from an alkali to transitional basaltic magma, South Africa Sybrand de Waal Centre for Research on Magmatic...Geology, University of Pretoria, Pretoria 0002, South Africa. Current address: PO Box 21167, Windhoek, Namibia...Geology, University of Pretoria, Pretoria, 0002 South Africa. Current address: Shango Solutions, HHK House...Geology, University of Pretoria, Pretoria 0002, South Africa. Current address: School of Biological, Earth...Environmental Sciences University of New South Wales Sydney, New South Wales, 2052 Australia e-mail: i.graham@unsw |  | Lenhardt, Nils, Eriksson, Patrick G., Catuneanu, Octavian, Bumby, Adam J. (2012) Nature of and controls on volcanism in the ca. 2.32â2.06Ga Pretoria Group, Transvaal Supergroup, Kaapvaal Craton, South Africa. Precambrian Research, 214. 106-123 doi:10.1016/j.precamres.2011.09.012 | Journal (article/letter/editorial) | | Group, Transvaal Supergroup, Kaapvaal Craton, South Africa Nils Lenhardt a,â , Patrick G. Eriksson a ,...Geology, University of Pretoria, Pretoria 0002, South Africa Department of Earth and Atmospheric Sciences...within-craton volcanism Pretoria Group Kaapvaal Craton South Africa a b s t r a c t The time of deposition of the...the Pretoria Group between 2.32 and 2.06 Ga on South Africaâs Kaapvaal Craton was characterized by the...Intermittent hiatuses in volcanism were marked by local lacustrine shale deposition. Finally, the Machadodorp |  | | Journal (article/letter/editorial) | | Geological Survey, Private Bag X112, Pretoria, South Africa ABSTRACT The Vredefort dome (2.0Ga) represents...Northern part after geological map of South Africa, sheet 2626, West Rand (Keyser, 1986). Southern part...geological map 2726, Kroonstad (Geological Survey of South Africa); interpretations by Borchers (1964) and Pretorius...collar are generally overturned, whereas further south, slightly overturned to normal dips prevail (Nel...are normal and range from 30 to 80" towards the south-east. The collar rocks form a circle 80 km in diameter; |  | Humbert, Fabien, de Kock, Michiel O., Altermann, Wladyslaw, Elburg, Marlina A., Lenhardt, Nils, Smith, Albertus J.B., Masango, Samson (2018) Petrology, physical volcanology and geochemistry of a Paleoproterozoic large igneous province: The Hekpoort Formation in the southern Transvaal sub-basin (Kaapvaal craton) Precambrian Research, 315. 232-256 doi:10.1016/j.precamres.2018.07.022 | Journal (article/letter/editorial) | | Johannesburg, South Africa b Department of Geology, University of Pretoria, Pretoria 0002, South Africa Accepted...and the ~ 2.43 Ga Ongeluk Formation (Griqualand West sub-basin) represent voluminous Paleoproterozoic...Paleoproterozoic igneous events on the Kaapvaal craton of South Africa that predate the emplacement of the ~ 2.055 Ga...described from three sub-basins (i.e., the Griqualand West, Kanye and Transvaal sub-basins). The successions...represented by the Postmasburg Group in the Griqualand West sub-basin, and the Pretoria Group within the Transvaal |  | | Journal (article/letter/editorial) | | University of Pretoria, Pretoria, 0002 Republic of South Africa E-mail: sadw@scientia.up.ac.za R.A. Armstrong...vicinity of Marble Hall, Mpumalanga Province, South Africa. A mesocratic variety gives a 207Pb/206Pb SHRIMP...Complex, and the Rietfontein Complex in the Potchefstroom area. These findings reinstate the economic...the town of Marble Hall, Mpumalanga Province, South Africa. The diorite, showing a major-element composition...the Dennilton Dome (Figure 1), directly to the south of the Fragment, are two juxtaposed floor domes |  | | Book | | ASSISTANT-DIRECTOR. GEOLOGICAL SURVEY OF THE UNION OF SOUTH AFRICA AND Dr. G. A. F. MOLENGRAAFF, PROFESSOR OF... . . . 135 V 2. The Local 137 Component The Causes of the Local 3. The Order Space Component...Fig. The load of sediments covering the granite north of 16. pseudo-tachylyte Johannesburg granite...Components 141 Polymetamorphism Overtilted ripple-marks Reef Quartzite Fig. 20. of the Schematical ...the igneous phenomena along the margin of the north-western section of the Vredefort Granite Boss. From |  | | Journal (article/letter/editorial) | | unconformity in the Transvaal succession of South Africa Eric. S. Cheneya'l and David Twist b'2 aDepartment...University, P.O. Box 524, Johannesburg, 2000, South Africa blnstitute for Geological Research on the Bushveld...Complex, University of Pretoria, Pretoria, 0002, South Africa (Received August 29, 1988; accepted after revision...unconformity in the Transvaal succession of South Africa. Precambrian Res., 52:115-132. A previously...succession of the Kaapvaal province of southern Africa. The predominantly marine and siliciclastic rocks |  | | Journal (article/letter/editorial) | | Granites of Africa. 455 I V . â 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...JohannesburgPretoria granite boss, about 3 miles north-east of Johannesburg. He has also added notes on |  | | Journal (article/letter/editorial) | | Granite-Charnockite Intrusives in Southeastern Africa A. Kerr and G. C. Milne* Department of Geology...Applied Geology, University of Natal, Durban, South Africa With 6 Figures Received October 28, 1991; accepted...Present address: 47 Survey Squadron, PO Box 8184, Potchefstroom 140 A. Kerr and G. C. Milne meisten Gesteine...Location of the Proterozoic rocks of Natal, South Africa, showing the distribution of the late-kinematic...considered to be partly a flow fabric, has a broad east-west orientation, curving parallel to the margin of the |  | | Journal (article/letter/editorial) | | Johannesburg, 2000, Republic of South Africa 2 Chamber of Mines of South Africa Research Organization, P.O... Box 91230, Auckland Park 2006, Republic of South Africa Abstract. Hydrothermal alteration of peraluminous...exposed over an area of some 10kin 2 south of the Klerkskraaldam west of Johannesburg (Fig. 1). They appear...(JO = Johannesburg, VE = Ventersdorp, PO = Potchefstroom, VR = Vredefort) (after Borchefs, 1961) Archaean... Granitoid texture with quartz, microcline and albite demonstrating selectively pervasive, weak sericitization |  | | Journal (article/letter/editorial) | | Intrusions and the Roodekraal Complex,Vredefort, South Africa: comagmatic plutonic and volcanic products of...Geology, University of Pretoria, Pretoria 0002, South Africa. e-mail: sybrand@dewaals.com I.T. Graham Centre...Geology, University of Pretoria, Pretoria 0002, South Africa. Geoscience, Australian Museum, 6 College St...edu.au © 2006 September Geological Society of South Africa ABSTRACT The Lindeques Drift and Heidelberg...Kaapvaal Craton as km-sized bodies, to the north and north-east of the Vredefort impact structure, prior |  | | Journal (article/letter/editorial) | | the Witwatersrand and Ventersdorp Supergroups, South Africa By A. M. KILLICK,A. M. THWAITES,G. J. B. GERMS...haben ihre Ursache in der vorherrschend Nord bis West gerichteten Uberschiebungszone. Die deformierten...is described from the Witwatersrand basin in South Africa. The fault zone is dominated by pseudotachylke...addresses: Mr. A. M. KILLICK,Mr. A. M. THWAITESand Dr. G. J. B. GERMS, Research Unit, Johannesburg Consolidated...Co., P.O. Box 976, Randfontein, 1760, South Africa and Prof. Dr. A. E. Scl-tOCH, Department of Geology |  | Chisonga, B.C., Gutzmer, J., Beukes, N.J., Huizenga, J.M. (2012) Nature and origin of the protolith succession to the Paleoproterozoic Serra do Navio manganese deposit, Amapa Province, Brazil. Ore Geology Reviews, 47. 59-76 doi:10.1016/j.oregeorev.2011.06.006 | Journal (article/letter/editorial) | | Johannesburg, P.O. Box 524, Auckland Park, 2006, South Africa CAE Mining-Datamine, 8 Bentley OfïŹce Park, Corner...& Wessels Road Rivonia, 2128, Johannesburg, South Africa Department of Mineralogy, Technische UniversitĂ€t...Geology, North-West University, Potchefstroom Campus, Private Bag, x6001, 2520 Potchefstroom, South Africa...important sources of high-grade manganese ore to the North American market. The high-grade manganese oxide...protoliths of the Serra do Navio Formation. The local geological context and nature of this protolith |  | | Journal (article/letter/editorial) | | of the Ventersdorp Dome, Western Transvaal, South Africa R. Klemd and J. M. Barton, Jr. Geology Department...the Rand Afrikaans University, Johannesburg, South Africa With 5 Figures Received November 9, 1987; accepted...the Ventersdorp Dome in the western Transvaal (South Africa) involved pervasive and vein-controlled epidotization...subhedral to euhedral plagioclase often exhibits albite twinning and distinct ocellatory zonation (Fig...analyses of the plagioclase revealed the presence of albite to oligoclase (An6--11) composition. Since the |  | | Journal (article/letter/editorial) | | Archean Sodium Group, Ventersdorp Supergroup, South Africa: Volcanology, sedimentology and geochemistry...Geology, University of Pretoria, 0002 Pretoria, South Africa a r t i c l e i n f o Article history: Received...volcano-sedimentary succession of the Sodium Group, in the south-western corner of the Kaapvaal craton, rests unconformably...petrology of Phanerozoic reservoir sandstones from North Germany. Unfortunately this work will now, for long...the question marks for him. The lack of monomict conglomerates, as described from North America (Corcoran |  | | Journal (article/letter/editorial) | | University, P. 0. Box 524, Auckland Park, 2006, South Africa Author's e-mail address: LDA@na.rau.ac.za (Received...Frick and Hammerbeck of the Catalogue of South African and South West African M e t e o r i t e s , the inventory...individual meteorites from Namibia (formerly South West Africa) has more than doubled to a present total...to fervent searches for specimens, especially by local residents in the area around Gibeon (Fig. l), in...years. During such an effort in 1996 November, a local resident came upon a group of dark stones that he |  | | Journal (article/letter/editorial) | | Sciences and Development, North-West University, Private Bag X6001, 2520, South Africa a r t i c l e i n...French Massif Central, which forms part of the north Gondwana margin (e.g., Faure et al., 2009). Two...Förster, 2002), or the Limpopo Complex in Southern Africa (Touret and Huizenga, 2011). It includes quartzâplagioclase...replaced by albite, scapolite and phlogopite, then by massive actinolite that is surrounded by albite fading...Norway) (Dahlgren et al., 1993). (b) Metasomatic albite and actinolite-bearing vein in garnet-bearing amphibolite |  | | 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...valuable stratigraphic markers (SACS, 1980 ). In the West Rand Group, such horizons include the Water Tower...appears more slaty in weathered outcrops in central-north and east Johannesburg. Parktown Shale Formation:...Jeppestown shale) is a very prominent horizon near the West Rand Group-Central Rand Group boundary. It is persistent |  | | Journal (article/letter/editorial) | | Asbestos-bearing Penge Iron Formation, Eastern Transvaal, South Africa T. MIYANO1 AND N. J. BEUKES2â 1 INSTITUTE OF...BOX 524, AUCKLAND PARK, JOHANNESBURG 2006, SOUTH AFRICA RECEIVED AUGUST 15, 1996 ACCEPTED DECEMBER...rocks at Penge and Mafefe, in eastern Transvaal, South Africa. The rocks are laterally equivalent to the diagenetic...Asbesheuwels iron-formation succession in Griqualand West. Metamorphism at Penge apparently took place at...of the Bushveld Complex in eastern Transvaal, South Africa (Fig. 1). The iron-formation succession is unique |  | | Journal (article/letter/editorial) | | Livingstone Randfonteln Langlaagte Main ,Leader ,South Roodepoort JEPPESTOWN Crown Florida Witpoortjie...component. Depositionof the West RandGroup is considered provinceto the north of the Kaapvaalcraton(Burke...de- subductionto the north of the basin,while the Central velopmentof the West RandGroup when a seriesof...pointsof fluvialsystemsinto the basin.Paleo- the West Rand Group, lessthan one percent of the current...derivedfrom broadlycontiguousarea mainlyto the north, north- the lower division. Furthermore, the nature |  | McCarthy, T.S., Corner, B., Lombard, H., Beukes, N.J., Armstrong, R.A., Cawthorn, R.G. (2018) The pre-Karoo geology of the southern portion of the Kaapvaal Craton, South Africa. South African Journal of Geology, 121 (1) 1-22 doi:10.25131/sajg.121.0006 | Journal (article/letter/editorial) | | the southern portion of the Kaapvaal Craton, South Africa T.S. McCarthy School of Geosciences, University...2050, South Africa Shango Solutions, HHK House, 22 Ethel Street, Johannesburg 2194, South Africa e-mail:...Department of Geosciences, University of Cape Town, South Africa e-mail: branko@iafrica.com.na H. Lombard Geo-Consult...address: PO Box 469, Struben's Valley, 1735, South Africa e-mail: henri.lombard@gmail.com N.J. Beukes...University of Johannesburg, Auckland Park 2006, South Africa e-mail: nbeukes@uj.ac.za R.A. Armstrong Research |  | | Journal (article/letter/editorial) | | Basement Granulites in the Vredefort Structure, South Africa, and Their Relations to Pseudotachylite W. Schreyer...static metamorphism, which was probably caused by a local, deep-seated magma diapir. On this basis, the meteorite...cordierite-garnet-orthopyroxene-quartz assemblage from South Africa is described in which the derivation of this...situated about 100 km southwest of Johannesburg, South Africa, is a domical feature which appears on the geologic...pseudotachylite veinlets. Steynskraal near Vredefort, South Africa Fig. 2. Low magnification microphotograph of |  | | Journal (article/letter/editorial) | | the deposition of the Duitschland Formation (South Africa): implications for depositional settings, Paleoproterozoic...the deposition of the Duitschland Formation (South Africa): implications for depositional settings, Paleoproterozoic...the deposition of the Duitschland Formation (South Africa): implications for depositional settings, Paleoproterozoic...The Paleoproterozoic Great Oxidation Event (GOE) marks the first significant oxidation of atmosphere and...of causes and effects related to the GOE. In South Africa, MIF-S disappears across the âmid-Duitschland |
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