 | | Journal (issue) | | Geological Society of Zimbabwe Newsletter June, 2008 Geological Society of Zimbabwe G Z S Newsletter...SOCIETY OF ZIMBABWE, P.O. BOX CY 1719, CAUSEWAY, HARARE Geological Society of Zimbabwe Newsletter ...……………………………………………….. 5 Geology of the Chewore Inliers, Zimbabwe: Constraining the Mesoproterozoic to Palaeozoic...Triassic/EarlyJurassic Forest Sandstone, Mana Pools Basin, Zimbabwe ..…………. 9 AGM - CHAIRMAN’S REPORT 2007………………………………………………………...Honorary Life Membership of the Geological Society of Zimbabwe …………………………………………………….. 14 NEWS ……………………………………………………………………………………… |  | | Journal (issue) | | Geological Society of Zimbabwe Newsletter February, 2011 Geological Society of Zimbabwe G Z S Newsletter...SOCIETY OF ZIMBABWE, P.O. BOX CY 1719, CAUSEWAY, HARARE Geological Society of Zimbabwe Newsletter ...……………………….. Geology Department, University of Zimbabwe ……………………………………… Geological Survey Department ...Committee, on behalf of the Geological Society of Zimbabwe, would like to offer a sincere vote of thanks...debeer@cadline.co.zw 2 Geological Society of Zimbabwe Newsletter February, 2011 Editorial Here we |  | | Journal (issue) | | Geological Society of Zimbabwe Newsletter October, 2009 Geological Society of Zimbabwe G Z S Newsletter...the threat of geo-hazards in Zimbabwe THE GEOLOGICAL SOCIETY OF ZIMBABWE, P.O. BOX CY 1719, CAUSEWAY...CAUSEWAY, HARARE Geological Society of Zimbabwe Newsletter October, 2009 Contents EDITORIAL ………………………………...Geological Society Representative’s report on the Zimbabwe School of Mines ... 13 New Geological map of Mozambique...……………………….. Geology Department, University of Zimbabwe …………………………………….. Geological Survey Department |  | | Journal (issue) | | Geological Society of Zimbabwe Newsletter June, 2009 Geological Society of Zimbabwe G Z S Newsletter...SOCIETY OF ZIMBABWE, P.O. BOX CY 1719, CAUSEWAY, HARARE Geological Society of Zimbabwe Newsletter ...of the Zimbabwe Craton …………………..……..………….... 9 Karoo Large Igneous Province, Botswana-Zimbabwe .........2008. Relationship between Shamva Danton and Shamva Mine ore bodies …………………………………………………………….. 13 Nomination...……………………….. Geology Department, University of Zimbabwe …………………………………….. Geological Survey Department |  | | Journal (article/letter/editorial) | | platinum-group elements at Hartley Platinum Mine, Zimbabwe Part 1. Primary distribution patterns in pristine...element (PGE) mineralization. At the Hartley Platinum Mine, the MSZ is up to some meters thick and is composed...Sulfide Zone Æ Great Dyke Æ Hartley Platinum Mine Æ Zimbabwe Introduction Deposits of platinum-group elements...Bushveld Complex, South Africa). The Great Dyke of Zimbabwe (Fig. 1) constitutes the world’s second largest...primary MSZ ores collected at the Hartley Platinum Mine. The present paper reports on the distribution and |  | Stribrny, B., Wellmer, F. -W., Burgath, K. -P., Oberthür, T., Tarkian, M., Pfeiffer, T. (2000) Unconventional PGE occurrences and PGE mineralization in the Great Dyke: metallogenic and economic aspects. Mineralium Deposita, 35 (2) 260-280 doi:10.1007/s001260050019 | Journal (article/letter/editorial) | | redistributions should be kept in mind during planning and mine operation. Investigations of unconventional PGE...initial production from mines in the Great Dyke of Zimbabwe has yielded 2.1 t Pt. The remaining 9.54 t are...Russia Stillwater, USA Sudbury, Canada Great Dyke, Zimbabwe Kupferschiefer, Poland Bregu i Bibes, Albania...production, for example those of the Great Dyke, Zimbabwe, ± potential alternatives in the form of unconventional...mineralizations PGE in layered intrusions: the Great Dyke, Zimbabwe Geological setting The ca. 2.58-Ga-old Great Dyke |  | | Journal (issue) | | Geological Society of Zimbabwe Newsletter June, 2011 Geological Society of Zimbabwe 1960 -2010 G S Z...Newsletter June 2011 Tectonic evolution of the Zimbabwe Craton in the early Palaeoproterozoic. (a) Following...Following Söderlund et al. (2010), the Zimbabwe craton is positioned along the eastern margin of the Superior...basin initiated. (c) Assembly of the Kaapvaal and Zimbabwe cratons, and unknown terrane, Terra Incognita...Incognita at ca. 2.0 Ga led to tectonic escape of the Zimbabwe Craton and dextral shearing in the Limpopo Belt |  | Piña, R., Gervilla, F., Barnes, S.-J., Oberthür, T., Lunar, R. (2016) Platinum-group element concentrations in pyrite from the Main Sulfide Zone of the Great Dyke of Zimbabwe. Mineralium Deposita, 51 (7) 853-872 doi:10.1007/s00126-016-0642-3 | Journal (article/letter/editorial) | | concentrations in pyrite from the Main Sulfide Zone of the Great Dyke of Zimbabwe R. Piña 1 & F. Gervilla...The Main Sulfide Zone (MSZ) of the Great Dyke of Zimbabwe hosts the world’s second largest resource of platinum-group...pyrrhotite, pentlandite, chalcopyrite, and minor pyrite. Recently, several studies have observed in a number...number of Ni-CuPGE ore deposits that pyrite may host significant amounts of PGE, particularly Pt and...trace element contents in pyrite from the Hartley, Ngezi, Unki, and Mimosa mines of the Great Dyke by |  | | Journal (article/letter/editorial) | | in the oxidized Main Sulfide Zone, Great Dyke, Zimbabwe Marek Locmelis & Frank Melcher & Thomas Oberthür...Great Dyke mafic/ultramafic layered intrusion of Zimbabwe, economic concentrations of platinum-group elements...Beneficiation . PGE oxides Introduction The Great Dyke of Zimbabwe is a 2,575.4±0.7-Ma-old mafic/ ultramafic layered...cutting Archean granites and greenstone belts of the Zimbabwe Craton (Prendergast 1988; Oberthür et al. 2002)...are pyrrhotite, pentlandite, chalcopyrite, and pyrite that mainly form polyphase aggregates. The main |  | Oberthur, T., Weiser, T. W., Melcher, F., Gast, L., Wohrl, C. (2013) DETRITAL PLATINUM-GROUP MINERALS IN RIVERS DRAINING THE GREAT DYKE, ZIMBABWE. The Canadian Mineralogist, 51 (2) 197-222 doi:10.3749/canmin.51.2.197 | Journal (article/letter/editorial) | | PLATINUM-GROUP MINERALS IN RIVERS DRAINING THE GREAT DYKE, ZIMBABWE Thomas OBERTHÜR§, Thorolf W. WEISER, Frank MELCHER...and PGE-oxides (unstable). Keywords: Great Dyke, Zimbabwe, alluvial sediments, Pt-Fe alloy, Os-Ir-Ru alloy...Bushveld Complex of South Africa, the Sudbury district in Canada, and later Norilsk in Russia came into...intrusions (Bushveld, South Africa; Great Dyke, Zimbabwe; Stillwater, USA) that host the overwhelming proportion...of knowledge on the Great Dyke of Zimbabwe. The Great Dyke of Zimbabwe constitutes the world’s second largest |  | | Journal (article/letter/editorial) | | Bushveld Complex, South Africa, and Great Dyke, Zimbabwe Thomas Oberthür Bundesanstalt für Geowissenschaften...Complex of South Africa and the Great Dyke of Zimbabwe. Samples were obtained underground, from core...Bushveld Complex, South Africa; the Great Dyke, Zimbabwe; the Stillwater grains, and they are ofthe subordinate...Bushveld Complex in South Africa, of the Sudbury district in Canada, and later Norilsk in Russia grand style...Bushveld Complex; South Africa; Great is Dyke; Zimbabwe; platinum-group minerals; Bushveld Complex in |  | | Journal (article/letter/editorial) | | Platinum-Group Element Mineralisation in the Great Dyke, Zimbabwe, and its Relationship to Magma Evolution and Magma...Prendergast 1 Carson Close, Greendale, Harare, Zimbabwe. e-mail: marprend@hotmail.com ABSTRACT The platinum-group...magma chamber. Introduction The Great Dyke of Zimbabwe contains the world’s second largest single resource...Main Sulphide Zone: at the time of writing, the Mimosa mine is commencing major expansion, open-cast operations...operations recently began at the Ngezi mine and further work is being carried out at the Unki prospect (see |  | | Journal (article/letter/editorial) | | patterns. Three of thesehydrothermalsystems(Herminia, Mimosa, and Estela) have now been studiedmineralogicallyand...detailedmetal ratio contouring.The central part of the district, characterized by the pyritic gold-tungstenmineralization...Along these paths they depositedfirst enargite-pyrite-tennantite/tetrahedrite, then a zone of complex...followedby lead sulfosalts,orpiment,and realgar. In the Mimosa vein system,tennantite/ tetrahedritepredominatesin...ard along the solution paths. In Estela, early pyrite-wolframite mineralization is followed first by |  | Maier, W.D., Määttää, S., Yang, S., Oberthür, T., Lahaye, Y., Huhma, H., Barnes, S.-J. (2015) Composition of the ultramafic–mafic contact interval of the Great Dyke of Zimbabwe at Ngezi mine: Comparisons to the Bushveld Complex and implications for the origin of the PGE reefs. Lithos, 238. 207-222 doi:10.1016/j.lithos.2015.09.007 | Journal (article/letter/editorial) | | ultramafic-mafic contact interval of the Great Dyke of Zimbabwe at Ngezi mine: Comparisons to the Bushveld Complex and...ultramafic-mafic contact interval of the Great Dyke of Zimbabwe at Ngezi mine: Comparisons to the Bushveld Complex and...contact interval of the Great Dyke of Zimbabwe at Ngezi T mine: Comparisons to the Bushveld Complex...NU 1. SC R Sulfide Zone. The Great Dyke of Zimbabwe is one of the world’s largest layered mafic-ultramafic...Archaean granitoids and greenstone belts of the Zimbabwe craton at T about 2575 Ma (Mukasa et al., 1989; |  | | Journal (article/letter/editorial) | | mineralization is present in the Julcani mining district, Peru, as fracture fillings in Tertiary volcanics...are used to determinemetal ratios throughoutthe district. The changesin metal ratios are large and systematic...mineralizing solutions. In the southeast.ernpart of the district, Herminia-Lucrecia, ratios change systematicallyaway...changesin three other mineralized areas of the district indicate general domal zoning. In general,Pb/Cu...Ag/Cu have maxima (Herminia), minima (Ag/Cu in Mimosa), or decreasemonotonically (.Carmencita). This |  | | Journal (article/letter/editorial) | | the emplacementof radiatingswarmsof tourmaline-pyrite brecciadikeletscementedby quartz-containing saline...stronglyzonedwith a generalsuccessionof quartz+ pyrite + wolfamite-,enargite-,tetrahedrite-,galena-,andbarite-dominant...southeast of Lima(Fig. 1). Production from the district began in Spanishcolonial times whenfree-milli...Julcanidistricthave concentratedon the geologyof the district,mineralogy of the veinsand associatedalterated...intrusionof quartz-pyrite-tourmaline breccia dikes near the center of the district. De- JULCANI HERMINIA |  | | Report (issue) | | districts Guanajuato District, Guanajuato, Mexico References Geologic map of Guanojuato District, Mexico Pachuca-Real...del Monte District, Hidalgo, Mexico References Geologic map of Pachuca-Real del Monte District, Mexico...Colqui District, Lima, Peru References Geologic map of Colqui District, Peru Julcani District, Huancavelica...Huancavelica, Peru References Geologic map of Julcani District, Peru 1 2 3 4 4 10 11 12 16 18 19 24 25 26 31...are the Guanajuato district of Guanajuato, Mexico, the Pachuca-Real del Monte district of Hidalgo, Mexico |  | | Journal (article/letter/editorial) | | platinum-group elements at Hartley Platinum Mine, Zimbabwe Part 2: Supergene redistribution in the oxidized...the Makwiro River close to the Hartley Platinum Mine indicates further mineralogical changes. Sperrylite...Æ Placers Æ Great Dyke Æ Hartley Platinum Mine Æ Zimbabwe Editorial handling: O. Thalhammer T. Oberthür...Espoo, Finland Introduction In the Great Dyke of Zimbabwe, economic concentrations of platinum-group elements...created in the course of mining at Hartley Platinum Mine. The present study focuses on the redistribution |  | | Journal (article/letter/editorial) | | 1932). (1974), and Wu and Petersen(1977). This district :::.:•:• ?•;;i•?,'•, -•:--•.' •-;•-:?'ii•i;•i...sequenceof foldedsedimentaryand The Coeur d'Alene district in northern Idaho, the volcanicrocks.Late Tertiary...high-temperature vein minerals occursin the deepestlevel of the mine. The veins .5 I consistof mineralizedfracturesup...percentby volumeof the vein filling, comprises quartz, pyrite, sphalerite,and galena.The second stage,composingabout...minoramountsof quartz,galena,sphalerite,sulfosalts, and pyrite and representsabout 10 percent of the vein fillings |  | | Journal (issue) | | except the Dale Beck Valley, Dry Gill and Carrock End Mine. Grahamis hoping to get the permit system properly...still very much a 'frontier place'. One supposed mine was started by a character called Otto van Stryk...Stryk who thought he had found a huge iron mine. Alas, he never got any useable ore out of it. Rick went... So now it is recognised as a potential uranium mine! Another anecdote involved a light plane brought...amethyst, fluorapatite and tourmalines. Rossinguranium mine, a uraniferous granite, was also mentioned. Rick |  | | Journal (article/letter/editorial) | | Main Sulfide Zone at Unki Mine, Shurugwi Subchamber of the Great Dyke, Zimbabwe: Evidence from Petrography...element (PGE) occurrence in the Great Dyke of Zimbabwe, the Main Sulfide Zone (MSZ), is a tabular stratabound...silicate composition study across the MSZ at Unki Mine in the Shurugwi Subchamber was conducted to help...the mineralization. The PGE-enriched zone at Unki Mine is a ~10 m thick package of rocks ranging from gabbronorites...of sulfide mineralization likely occurred at Unki Mine with primary sulfides occurring in association with |  | | Journal (article/letter/editorial) | | Metal ratio map of the 360 level of the Herminia mine showinglocationof major veins. Dotted linesrepresentlogPb/Cu...LEVEL lOOm FIG. 5. Vertical sectionof the Herminia mine with a map view projected to the 330 level. Locations...BIS TT CPY BA TT EN., PY PY EARLY LATE MIMOSA EARLY LATE HERMINIA FIG. 6. Paragenesisdiagramfor...GN = galena,MAT = matildite,PAV = pavonite,PY = pyrite, SB = stibnite,SEM = semseyite,TT = tennantite-tetrahedrite...compositions. Farther down the flow path Herminia mine show a more pronouncedminimum this solidsolutionis |  | | Journal (article/letter/editorial) | | ACT The sulphide ores from the Julcani mining district (Peru) display many retrograde reactions that...[~(Cu,Ag)10(Zn,Fe)2(Sb,As)4S13] from the Herminia mine exhibit pronounced downstream enrichments in molar...retrograde reactions, Julcani District, Peru. Introduction THE Julcani mining district in Peru is located in...~250 km SE of Lima (Fig. 1). It is a major mining district that accounts for signi cant quantities of Pb... and signi cant amounts of antimony. In this district, ore is concentrated in fracture llings in rhyodacitic |  | | Journal (article/letter/editorial) | | POTASSIUMAND RUBIDIUM METASOMATISM AT THE ]ULCANI DISTRICT, PERU DARYL A. SCHERKENBACH NorandaExploration...determined and rubidium metasomatism on both a district-wide scaleandat closeproximityto veinsandveinsystems...fine-grainedor glassy Most of the altered rocksin the district thedetermination of accurate background values...majormineralizationnormal cludingepidote, chlorite, calcite, pyrite, smectite, quartz, sericite,albite, and/or K-feldspar...coverageof about 20 km2 of the altered and quartz, and pyrite, and in somecasescontainalunite unaltered dacites |  | Barnes, Sarah-Jane, Prichard, Hazel M., Cox, Richard A., Fisher, Peter C., Godel, Belinda (2008) The location of the chalcophile and siderophile elements in platinum-group element ore deposits (a textural, microbeam and whole rock geochemical study): Implications for the formation of the deposits. Chemical Geology, 248 (3) 295-317 doi:10.1016/j.chemgeo.2007.08.004 | Journal (article/letter/editorial) | | (Busveld Complex, South Africa and Great Dyke, Zimbabwe) ∼ 30 to 60% of the siderophile elements (except...deposits. Sulfide droplets from the Medvezky Creek Mine, Noril'sk (Barnes et al., 2006) occur in unmetamorphosed...Main Sulfide Zone (MSZ) reef of the Great Dyke, Zimbabwe, and the Merensky Reef of the Bushveld Complex...(2002). 3.1. The Great Dyke The Great Dyke of Zimbabwe is a 500 km long layered intrusion (Fig. 1) of...(pyrrhotite, pentlandite, chalcopyrite and minor pyrite) make up 0.5 to 10 vol.% of the rock (Prendergast |
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