 | | Journal (issue) | | affiliated with the Friends of Mineralogy publisher John S. White Division of Mineralogy The Smithsonian...Arthur Roe Famous Mineral Localities: The Brumado District, Bahia, Brazil..................................Thomssen, Walt Risch, Star Northam, Carolyn Wilson, John Muntyan and Wayne DeBrusk assisted with record keeping...Brazil) Pierre and Nellie Bariand (Paris, France) F. John Barlow (Appleton, WI) Ron Bentley (Windsor, CT)...Cureton, David Wilber, Miguel Romero, Richard Webster, John Barlow and Rustam Kothavala made cash donations |  | | Journal (article/letter/editorial) | | Deposit—Kalahari Manganese Ore Field (Northern Cape, South Africa): Geochemistry of Isotopes (δ13C and...carbonate inclusions in the Mamatwantype oxide ores (braunite lutites) made it possible to reveal residual microbial...1134/S0024490212030054 The Northern Cape manganese ore province (South Africa) is confined to the Kalahari...of ore material in slightly altered manganese (braunite) lutites taken from the Mamatwan deposit, the...Kalahari Desert (Northern Cape province, South Africa) are confined to rocks of the Hotazel Formation. Together |  | | Journal (issue) | | mines, Kalahari Manganese Field, Northern Cape Province, South Africa ..................................crystals on matrix, 17.2 cm, from the N’Chwaning I mine, collected in 1978. Private collection and photographer...(2015–2016) Scott A. Rudolph Paradise Woods (2008–2016) John Dabney (2015–2016) Daniel J. Record Irv Brown (2009–2015)...(2016–2017) Eric D. Long Barry M. & Beth Kitt (2011–2016) John Schneider (2016) Dylan Stolowitz Steve Maslansky...com APATITE Nagar, Hunza Valley, Gilgit District, Northern Areas, Pakistan, 11.5cm. Fine Minerals International |  | Tsikos, H., Beukes, N. J., Moore, J. M., Harris, C. (2003) Deposition, Diagenesis, and Secondary Enrichment of Metals inthe Paleoproterozoic Hotazel Iron Formation, Kalahari Manganese Field, SouthAfrica. Economic Geology, 98 (7) 1449-1462 doi:10.2113/gsecongeo.98.7.1449 | Journal (article/letter/editorial) | | the Paleoproterozoic Hotazel Iron Formation, Kalahari Manganese Field, South Africa HARILAOS TSIKOS,†,*...2006, South Africa JOHN M. MOORE, Geology Department, Rhodes University, Grahamstown 6140, South Africa...Geological Sciences, University of Cape Town, Rondenbosch 7700, South Africa Abstract The Kalahari manganese...manganese field in the Northern Cape province, South Africa, is a world-class manganese resource (ca. 8 billion...billion tons at 20–48% Mn). It occurs within the Hotazel Formation in the uppermost Paleoproterozoic (2 |  | | Report (issue) | | SURVEY OF SOUTH AFRICA COUNCIL FOR GEOSCIENCE GEOLOGICAL SURVEY OF SOUTH AFRICA MINERALOGY OF SOUTH AFRICA:... COUNCIL FOR GEOSCIENCE GEOLOGICAL SURVEY OF SOUTH AFRICA Scientific Editor R.D. Dixon Linguistic and...Council for Geoscience (Geological Survey of South Africa), 280 Pretoria Street, Silverton, Pretoria or........................... 69 5.1 Overview of South African Occurrences ..............................LAYEREDSUITE,BUSHVELDCOMPLEX.... 111 MINERALOGY OF SOUTH AFRICA: TYPE-MINERAL SPECIES AND TYPE-MINERAL NAMES |  | | Journal (article/letter/editorial) | | oxygenated environment during deposition of the Hotazel Formation, are only known from Wessels-type ore...fault-controlled hydrothermal system that affected the Hotazel Formation in the northwestern part of the K M F...that the Ongeluk lava, dircctly underlying the Hotazel Formation, was subjected to a similar epigenetic...alteration process to that which affected the Hotazel Formation. It is of interest to note that the 'Kalahari...relatively large age gap between the deposition of the Hotazel Formation, some 2200 2300 Ma ago, and the hydrothermal |  | Moore, John M., Kuhn, Barbara K., Mark, Darren F., Tsikos, Harilaos (2011) A sugilite-bearing assemblage from the Wolhaarkop breccia, Bruce iron-ore mine, South Africa: Evidence for alkali metasomatism and 40Ar-39Ar dating. European Journal of Mineralogy, 23 (4) 661-673 doi:10.1127/0935-1221/2011/0023-2117 | Journal (article/letter/editorial) | | Bruce iron-ore mine, South Africa: Evidence for alkali metasomatism and 40Ar-39Ar dating JOHN M. MOORE1,...Geology, Rhodes University, Grahamstown 6140, South Africa *Corresponding author, e-mail: h.tsikos@ru.ac...breccia at the Bruce iron-ore mine, Northern Cape Province, South Africa. The upper portion of the breccia...breccia is dominated by braunite, albite, K-feldspar and aegirine, and locally hosts irregular-shaped void-fills...Similarities to sugilite-bearing assemblages at the Wessels mine in the Kalahari Manganese Field suggest that a single |  | | Journal (article/letter/editorial) | | todorokite from the Kalahari manganese field, South Africa J. Gutzmer and Nicolas J. Beukes Department...University, P.O. Box 524, Auckland Park 2006, South Africa e-mail: jg@na.rau.ac.za; njb@na.rau.ac.xa ABSTRACT...altered braunite-kutnahorite lutite at the Smartt Mine in the Kalahari manganese field, South Africa. Geological...place during Tertiary uplift and tilting of the South African Subcontinent. Careful chemical studies of... with fibre lengths up to 10cm, occur at Smartt mine in the Kalahari manganese field. The occurrence |  | | Journal (article/letter/editorial) | | kutnohorite (CaMn(CO3)2), rhodochrosite (MnCO3), and braunite (Mn(III)6Mn(II)O8SiO4). Pairing these mineral...earliest diagenetic mineral phases, rhodochrosite and braunite forming secondarily, and later alteration forming...Archean Mn deposits is striking, as is the massive Hotazel deposit at around 2.22 Ga. Several - sedimentary... West Africa Hotazel formation/Kalahari Mn field Minas Gerais, Brazil Koegas subgroup, S Africa 49 2200...summarized the major minerals in manganese deposits as braunite, a mixed valence Mn(III/II) oxide, and rhodochrosite |  | | Journal (issue) | | 85741 Editor & Publisher Wendell E. Wilson Founder John Sampson White Associate Editors Pierre Bariand Sorbonne...Zeolites and associated minerals from the Palabora mine, Transvaal........................................& R. S. W. Braithwaite The Lake George antimony mine, New Brunswick ..................... 263 by W. E...Kalahari m an g an ese field, C ape Province, South Africa. (See th e article in this issue, b eg in n...d e r n M in e r a l C o l l e c t io n CURATION John Sampson White Department of Mineral Sciences Smithsonian |  | | Journal (article/letter/editorial) | | the Transvaal Supergroup in Griqualand West, South Africa E. A. Schneiderhan Paleoproterozoic Mineralization...University of Johannesburg, Auckland Park 2006, South Africa e-mail: easc@rau.ac.za J. Gutzmer Paleoproterozoic...University of Johannesburg, Auckland Park 2006, South Africa e-mail: jg@na.rau.ac.za H. Strauss Geologi...Park 2006, South Africa e-mail: njb@na.rau.ac.za © 2006 March Geological Society of South Africa ABSTRACT...West, South Africa, is an exceptionally well preserved succession of banded iron formation, braunite lutite |  | | Journal (article/letter/editorial) | | Mineralization in the Kalahari Manganese Field, South Africa D. A. D. EVANS,† Tectonics Special Research...University, Auckland Park 2006, Johannesburg, South Africa AND J. L. KIRSCHVINK Division of Geological...enrichment in the Kalahari manganese field, South Africa, in order to assess mineralogical aspects of...manganese-rich cycles constitute the Early Paleoproterozoic Hotazel Formation, with an age of ca. 2200 Ma (Cornell...al., 1996) or 2400 Ma (Bau et al., 1999). The Hotazel Formation lies conformably between the underlying |  | | Journal (article/letter/editorial) | | phaserelationsinvolvemajoroxideminerals of the ores,namely,braunite,brauniteII, hausmannite, bixbyite,jacobsite,andhematite...form braunite II and andradite. Introduction THE Kalaharimanganese field, situatedin the Hotazel Formationof...ProterozoicTransvaalSupergroup in the northern Cape Province, South Africa (Fig. 1A),mostprobablyrepresents...Avontuur Deposit: Supergenealtered Joc(,bsitic are Hotazel Supergrade Thrust fault or• Hotozel v• Formation...stratigraphicsettingof braunitclutite ore bedsin the Hotazel Formation(C), and schematic blockdiagramof geologiccontrolsonthe |  | | Journal (article/letter/editorial) | | Erel b, John M. Moore a a b Geology Department, Rhodes University, Grahamstown 6140, South Africa Institute...iron-formation manganese Palaeoproterozoic South Africa a b s t r a c t The Hotazel Formation in the uppermost stratigraphic...Neoarchaean–Palaeoproterozoic Transvaal Supergroup of southern Africa is an unusual sedimentary sequence of banded iron-formation...and Mn-rich samples collected across the entire Hotazel sequence, with a view to constraining processes...during anaerobic organic carbon cycling in the Hotazel strata, suggests that manganese became an important |  | | Journal (article/letter/editorial) | | Department of Geology, University of Johannesburg, South Africa University College Dublin (UCD) School of Earth...Department of Geology, University of Johannesburg, South Africa e-mail: ljolly@uj.ac.za; fanusv@uj.ac.za P....University of Cape Town, South Africa e-mail: petrus.leroux@uct.ac.za © 2019 Geological Society of South Africa...erosional relics of the iron- and manganese-rich Hotazel Formation. A total of 19 manganese ore samples...samples from the lower manganese ore horizon of the Hotazel Formation were selected for analysis based on their |  | | Journal (article/letter/editorial) | | University RO. Box 524 AucWand Park, 2006 Gauteng, South Africa . . .*.’. Corresponding author: bc @na.rau...just south of the great Kalahari Desert on the vast plains of the Northern Cape Province of South Africa...of the Transvaal Supergroup rocks (black) in South Africa. B: Enlarged portion of Griqualand West showing...and one of the few economic centers of the Northern Cape Province. Kuruman is also the preferred home...live in the mine villages of Hotazel and Black Rock. These were established by SAMANCOR (South African Manganese |  | | Journal (article/letter/editorial) | | Department of Geology, University of Johannesburg, South Africa e-mail: nickvafeas@gmail.com; ljolly@uj.ac.za;...Geological Society of South Africa. Abstract The manganese ore of the Hotazel Formation in the Kalahari...Kalahari Manganese Field is hosted within the Hotazel Formation, a chemosedimentary sequence of three...al., 1986). The Hotazel Formation is confined to five erosional relics, namely the Hotazel, the Avontuur...kutnohoritic concretions interlayered within a finegrained braunite I and kutnohorite matrix (Kleyenstüber, 1984; |  | | Journal (article/letter/editorial) | | minerals(Hew- portant contributionshave been made by John de ett and Fleischer,1960), and the GriqualandWest...0861-0128/88/192/1108-1152.50 Mn DEPOSITS, SOUTH AFRICA 1109 Geologic Framework .• •:•:•:•:•:•:•:•:•:•...Stellenbosch). 1110 j. E. DE VILLIERS proximatelynorth-south,and regionalshearingand (includingmetamorphic deposits)...and these cryptomelane,psilomelane,hollandite,braunite,and youngdepositshavegreatlyhamperedthe searchfor...Morocco,for instance,hausmanniteand janekke,70 km south-southwest of Postmasburg. It was cobsiteoccurin |  | | Journal (article/letter/editorial) | | Johannesburg South Africa brucec@uj.ac.za Figure 1. Location of N’Chwaning mine in South Africa; map prepared...of view 1.7 cm, N’Chwaning II mine, Kalahari manganese field, South Africa. Bruce Cairncross specimen and... Nchwaningite N’Chwaning II Mine, Kalahari Manganese Field South Africa N chwaningite, Mn22+SiO3(OH)2·H2O...after its first occurrence at the N’Chwaning II mine (Nyfeler et al. 1995). Later specimens were also...also identified from the adjacent Wessels mine (von Bezing, pers. comm., cited in Nyfeler et al. [1995]) |  | Fairey, Brenton J., Timmerman, Martin J., Sudo, Masafumi, Tsikos, Harilaos (2019) The Role of Hydrothermal Activity in the Formation of Karst-Hosted Manganese Deposits of the Postmasburg Mn Field, Northern Cape Province, South Africa. Minerals, 9 (7) 408 doi:10.3390/min9070408 | Journal (article/letter/editorial) | | Deposits of the Postmasburg Mn Field, Northern Cape Province, South Africa Brenton J. Fairey 1,† , Martin J...Geology, Rhodes University, Grahamstown 6139, South Africa Correspondence: h.tsikos@ru.ac.za Current address:...Postmasburg Manganese Field (PMF), Northern Cape Province, South Africa, once represented one of the largest...Postmasburg manganese field; hydrothermal; karst; South Africa Minerals 2019, 9, 408; doi:10.3390/min9070408...(KMF), the Postmasburg Manganese Field (PMF) was South Africa’s largest producer of this important component |  | | Journal (article/letter/editorial) | | manganese ore in the Kalahari manganese ®eld, South Africa Received: 28 May 1996 / Accepted: 22 January...metasomatic alteration of low-grade sedimentary braunite-rich Mamatwan-type ore along a series of normal...normal faults in the Wessels-Nchwaning and Hotazel areas (Fig. 2A). The petrography of the transformation...35±38 wt.% in original sedimentary carbonate-rich braunite lutite to values of 45±60 wt.% in carbonate-poor...University, PO Box 524, Auckland Park 2006, South Africa e-mail: JG@RAU3. RAU.AC.ZA Fax: 0027-11-489-2309 |  | | Journal (article/letter/editorial) | | Enrichment in the Kalahari Manganese Field, South Africa: A new discrimination scheme for Kalahari manganese...Department of Geology, University of Johannesburg, South Africa University College Dublin (UCD), School of Earth...thrust fault in the Kalahari Manganese Field, South Africa has undergone three significant alterations events...Mamatwan-type manganese ore from Mamatwan mine in the south of the Kalahari Manganese Field as a reference...multiple geological settings. The Paleoproterozoic Hotazel Formation of the Kalahari Manganese Field hosts |  | | Journal (article/letter/editorial) | | variations and nonstoichiometryin the bixbyite-braunite polysomaticmineral group JonlN P. on Vil.nEnsr*Pnrrn...85287, U.S.A. AssrRAcr Bixbyite, braunite, neltnerite, and braunite-Il are members of a mineral group...2-module bixbyite, the 4-module braunite, and the 8-module braunite-Il, new 3-, 5-, and 8-module assemblages...intergrowths of bixbyite (free of silica) and braunite-Il (5 wto/oSiOr) have also been observed by Hnrelr...in the M2* and Si contents lower than those for braunite-Il. It had previously been shown by Damon et al |  | Cabral, Alexandre Raphael, Tsikos, Harilaos, Muramatsu, Yasuyuki, Sekiya, Tomoko (2011) Iodine and bromine contents in the Palaeoproterozoic Hotazel iron formation, Transvaal Supergroup, South Africa: A reconnaissance study. Geochemistry, 71 (3) 297-301 doi:10.1016/j.chemer.2011.02.004 | Journal (article/letter/editorial) | | the Palaeoproterozoic Hotazel iron formation, Transvaal Supergroup, South Africa: A reconnaissance study...Rhodes University, P.O. Box 94, Grahamstown 6140, South Africa Department of Chemistry, Faculty of Science...2011 Keywords: Iodine Bromine Hotazel Formation Palaeoproterozoic South Africa a b s t r a c t A reconnaissance...samples from the Palaeoproterozoic Hotazel iron formation, South Africa, with emphasis on iodine and bromine...Palaeoproterozoic Hotazel BIF, with emphasis on its I and Br contents. The Hotazel BIF provides an especially |  | | Journal (article/letter/editorial) | | alexander@iu-bremen.de © 2006 March Geological Society of South Africa ABSTRACT Comparison of shallow-water limestone... Mooidraai Formation, Transvaal Supergroup, South Africa, shows that the primary rare earth element (REE)...oxygenated marine environment in the underlying Hotazel Formation. This suggests that the “Great Oxidation...such as those from the Transvaal Supergroup in South Africa and from the Hamersley Group in Australia, for...Postmasburg Group of the Transvaal Supergroup, South Africa. We show that dolomitization did not modify |
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