 | | Journal (article/letter/editorial) | | University of the Witwatersrand, P.O. Wits 2050, South Africa Cnnrstopnrn J. HlrroN* Institute for Geological...University of Pretoria, Hillcrest, Pretoria 0002, South Africa Kpvrx F. Cassrnv Key Centre for Teaching and...Intrusion from the Karoo Igneous Province of South Africa have been studied. Many analysesof chromite...mixing. Data from a restricted interval of the Waterfall Gorge profile at the base of the picrite indicate...consistent with previously published data on Mg-rich ilmenite compositions. IxrnooucrroN * Presentaddress:Anglo-American |  | Groves, David I., Marchant, Trudi, Maske, S., Cawthorn, R. Grant (1986) Compositions of ilmenites in Fe-Ni-Cu sulfides and host rocks, Insizwa, southern Africa; proof of coexisting immiscible sulfide and silicate liquids. Economic Geology, 81 (3) 725-731 doi:10.2113/gsecongeo.81.3.725 | Journal (article/letter/editorial) | | IN Fe-Ni-Cu SULFIDES AND HOST ROCKS, INSIZWA, SOUTHERN AFRICA: PROOF OF COEXISTING IMMISCIBLE SULFIDE...which can be usedto indicatea magmaticorigin. the Insizwa complexin southernAfrica. Here, coexThesefeaturesinclude:(1)...sulfidesegregation andfractionation, (3) the agree- ferencesin ilmenite compositionbetweenthe two ment betweenobservedore...platinum-group elements)andthose Geologyof the Insizwa Fe-Ni-Cu Sulfide Deposits predictedon the basisof...sulfide depositsof the Waterfall mentaldata,and (4) chalcophileelementdepletion Gorge sectionof the Insizwaintrusionand |  | | Journal (article/letter/editorial) | | FENNER 409 The geochemical structure of the Insizwa lobe of the Mount Ayliff complex with implications...Geology, Rhodes University, Grahamstown 6140, South Africa e-mail: goonie.marsh@ru.ac.za P. Allen Department...University of Fort Hare, Alice, South Africa N. Fenner Falconbridge Ventures of Africa, PO Box 12708, Hatfield...Hatfield, Pretoria 0028, South Africa © 2003 Geological Society of South Africa ABSTRACT Detailed petrographic...instances) along the southeastern margin of the Insizwa lobe of the Mount Ayliff Complex reveal the existence |  | | Journal (article/letter/editorial) | | The Geologyand Geochemistryof the Waterfall Gorge Section of the Insizwa Complex with ParticularReferenceto...Jurassic-aged mafic rocksfrom the Waterfall Gorge sectionof the Insizwa layered complex,Transkei, range...responsiblefor the compositionalvariationin this unit at Insizwa, however, to accountfor the upward increasein the...the productionof the basalgabbro. Introduction Gorge,the sequenceof intrusiverocksand contact THE Karoo-agedInsizwa...The petrographicand major layered intrusions--Insizwa, Ingeli, Tonti, geochemicalvariationexhibitedthroughoutthe |  | | Journal (article/letter/editorial) | | Ni–Cu–PGE POTENTIAL OF THE INSIZWA LOBE, MOUNT AYLIFF INTRUSION, SOUTH AFRICA R. GRANT CAWTHORN§ AND F...Wits, 2050, South Africa ABSTRACT The Insizwa lobe of the Mount Ayliff Intrusion, South Africa, is part...drilling of a borehole into the center of the Insizwa lobe that revealed an abnormally thick ultramafic...indicating prior separation of sulfide. Keywords: Insizwa, Mount Ayliff Intrusion, Karoo magmatism, multiple...magnesian magma, Ni depletion, Sr isotopes, South Africa. SOMMAIRE Le lobe d’Insizwa de la masse intrusive |  | | Report (issue) | | 37.83 Total 99.3 99.66 100.00 (1) Insizwa deposit, South Africa; by electron microprobe, corresponding... insizwaite, cubanite, pyrrhotite (Insizwa deposit, South Africa); stannopalladinite, hessite, platinum...froodite (Sudbury, Canada); leadamalgam, chromite, ilmenite, magnetite, gersdorffite, pyrite, chalcopyrite...Distribution: From the Insizwa Cu–Ni deposit, Waterfall Gorge, Eastern Cape, South Africa [TL]. At Monchegorsk |  | | Journal (article/letter/editorial) | | shift effect in the Mount Ayliff Intrusion, South Africa R. Grant Cawthorn, Bernhard K. Sander and Ian...the Witwatersrand, Private Bag 3, Wits 2050, South Africa Received July 15, 1991/AcceptedJanuary 4, 1992...liquid shift. He specifically referred to the Insizwa lobe of the Mount Ayliff Intrusion and suggested...olivine gabbronorite, reaching 15 m thick at Waterfall Gorge (Lightfoot et al. 1984), but at Mount Evelyn...profiles through the picritic facies of the Tonti and Insizwa lobes of the intrusion (Fig. 3). Exposure permitting |  | | Journal (article/letter/editorial) | | at Carolusberg and East Okiep, Namaqualand, South Africa Received: 12 April 1999 / Accepted: 27 November... due to the paucity of refractory ores in the district. Assimilation of Cu-rich country rocks during...The Cu-sulphide ores of the Okiep district of Namaqualand, South Africa (Fig. 1), remain one of the more...more enigmatic mineral deposits in southern Africa. The ores are hosted by the pyroxenitic and, to a lesser...Sciences, University of Pretoria, Pretoria 0002, South Africa e-mail: wdmaier@scientia.up.ac.za et al. 1983; |  | | 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 |  | Barnes, Stephen J., Mungall, James E., Le Vaillant, Margaux, Godel, Belinda, Lesher, C. Michael, Holwell, David, Lightfoot, Peter C., Krivolutskaya, Nadya, Wei, Bo (2017) Sulfide-silicate textures in magmatic Ni-Cu-PGE sulfide ore deposits: Disseminated and net-textured ores. American Mineralogist, 102 (3) 473-506 doi:10.2138/am-2017-5754 | Journal (article/letter/editorial) | | distribution of S abundance in ores from the Ovoid and Eastern Deeps at Voisey’s Bay, after Lightfoot et al. (2012)...deflected close to the contact line to achieve local textural equilibrium. (c) Axial cross section of...instrumental noise from the image (generally a non-local mean filter was applied), and a 3D gradient watershed...north-eastern Brazil (Barnes et al. 2011c), the Merensky Reef of the Bushveld Complex in South Africa...the formation of vertical dilantancy triggered by local extension in the plane of the layering (Godel et |  | | Journal (article/letter/editorial) | | Glenmacnass, Co. Wicklow, sillimanite, 763 Rosses district, Donegal, beryl, 328 Three Rock Mtn, San@ford...yttrotungstite, raspite, stolzite, 261 Bau mining district, Sarawak, antimonian idoerase, 894 Tapah, Kinta...India Bhopal, levyne, 527 Ghoriajor, Sundargarh District, Orissa, blanfordite, 3z Jothvad, Gujarat, blandfordite...blandfordite, 32 Kacharwali, Nagpur District, Maharashtra, blanfordite, 32 Khetri copper belt, Rajasthan...hornblende, cummingtonite, 89o Mamandur, South Arcot District, Madras, ferroan gahnite, 528 Maruturu Anakapatle |  | | Journal (article/letter/editorial) | | intrusions. They are attributed to crystallization of ilmenite from evolved trapped intercumulus liquid buffered...association, notably the Insizwa and related intrusions from the Karoo province of South Africa. In addition, the...Chibacheka River intrusion, south-southeast of the town of Noril’sk on the eastern margin of the flood basalt...strongly exsolved Cr-free titanomagnetite with ilmenite lamellae, but no Cr-bearing spinels, and considerably...enclosed in any silicate mineral in particular. Minor ilmenite occurs as both coarse subskeletal grains and anhedral |  | | Journal (article/letter/editorial) | | APRIL 1949 KARROO DOLERITES OF THE UNION OF SOUTH AFRICA BY FREDERICK WALKER AND ARIE POLDERVAART CONTENTS...Karroo dolerites 685 Outlying areas in Southern Africa 687 Trias-Lias vulcanicity in Gondwanaland 687...System in the Union of South Africa 597 2. Distribution of Karroo System in Africa 600 3. Map and section...Grey sheet, Queenstown 605 5. Map and section of Insizwa sheet, Mount Ayliff 606 6. Map and section of Elephant's...of Mount Arthur (Kokstad) 621 15. Hornfelses of Insizwa (Mount Ayliff) 626 16. Assimilation product at |  | | Journal (article/letter/editorial) | | VANCE (E. R.), 605, manganese ores, 235 Bau mining district, Sarawak, Malaysia, anti721 monian idocrase, 894...FERNANDEZ(L. A.), Phenocrystic olivines from the eastern Azores, 165 Boulangerite, Cornwall, 767 BOUVIER(J...), An antimonian idocrase from the Bau mining district, Sarawak, 894 BRICE (W. R.), see CHANG (L. L....struvite from Skipton, Victoria, 381 Broken Hill, New South Wales, muscovite, myrmekite, 57o Bronzite, Sitathali...CESBRON(F.), 78I BushveM Complex, South Africa, ceylonite, ilmenite, titanomagnetite, 863 Bushveld-type |  | | Journal (article/letter/editorial) | | show geopetal indicators. Sulphur isotopes imply a local crustal source of S in these from pyritic sediments...of these sulphide occurrences was controlled by local country rock type. Low Ni/Cu and Pt/Pd ratios, also...abundant pyrite as large cubic crystals. Further south, in the Eskimonaes Segment, the Miki Fjord Macrodyke...xenoliths in the area around the ‘Saddle’ on the eastern side of the dyke (Fig. 3b), as described in the...Zone of the Skaergaard Intrusion on the latter’s eastern side. In addition to gabbroic rocks, it has a granophyric |  | | Book (edition) | | Meta/lurgical and Mineralogical Society o/ South Africa Journal of Chemical Phy ics Journal cif the...and Proceedings of the Royal Socief) 1 of Ne,v South Wales JPSJ Journal of rhe Physical Society of...Cand CSPG Pennskiye gubemskiye wdomo.sti (Perm district ga=elle) Pl,ilosopl,ical Maga=ine Periodico de...Artrocitc, Ivigtul cryolitc deposit. Ivittuut municipality. southwest Wi tgreenl Greenland. 73. 1492, ZK...2iOH)~. Lric.,3 km south of thc mouth of Akatorc Crcek, castcm Otago, Dunedin, South Island, New Zealand |  | | Book | | 1. Mafic dyke swarms in the Kaapvaal Craton, South Africa 189 3.4.2. The Mackenzie dyke swarm, Canada...controls of intracontinental alkaline magmatism in Africa 194 3.5.2. The Damaraland alkaline province, Namibia...Namibia 6.3.2. Anorogenic metamorphism in the eastern Pyrenees 6.3.3. Anorogenic metamorphism and intraplate...intraplate magmatism around the Vredefort Dome, South Africa 6.3.4. Metamorphism and fluid generation; metamorphogenic...Bushveld lgneous Complex, South Africa 8.2.3. Molopo Farms Complex, South Africa and Botswana 8.3 Magmatic |  | | Book (edition) | | hematite, rutile, and ulvöspinel separating from ilmenite). Fe-, Cu-, and Ag-containing sulfides are even...developing crystal. Thus, oxides such as chromite, ilmenite, and magnetite plus PGE alloys separate from the...examples are, for instance, surplus Fe or Ti in ilmenite or extra Fe in Cu-sulfides, such as chalcopyrite...oriented exsolution lamellae of rutile, ulvöspinel or ilmenite may occur in titanomagnetite. In other cases,...Finely lamellated and spindle-like exsolution of ilmenite (brownish grey) in hematite crystal (lighter grey) |  | | Book (edition) | | OF OF SOUTH AFRICA MINES GEOLOGICAL SURVEY MINERAL RESOURCES OF REPUBLIC OF THE SOUTH AFRICA...Second World War, and partly as a result of it, South Africa experienced vast industrial expansion. This...official ‘handbook on the mineral resources of South Africa, it has become necessary to revise, or rather...great diversity and magnitude of South African mineral deposits and local mining operations, the Economic...Chamber of Mines of South Africa with Mr G. H. Grange as co-ordinator, and the South, African mining industry; |  | Barnes, Sarah-Jane, Cox, R. A., Zientek, M. L. (2006) Platinum-group element, Gold, Silver and Base Metal distribution in compositionally zoned sulfide droplets from the Medvezky Creek Mine, Noril’sk, Russia. Contributions to Mineralogy and Petrology, 152 (2) 187-200 doi:10.1007/s00410-006-0100-9 | Journal (article/letter/editorial) | | droplets are found in a varitextured gabbronorite (the local term for this is a taxitic gabbro). The droplets...pyrrhotite (0.02– 0.05 mm in diameter). Euhedral ilmenite crystals approximately 1 mm in length are present...containing these elements are present in the rocks. Ilmenite was observed in these samples and Genkin et al...study of sulphide ores from the Noril’sk-Talnakh district Siberia. Can Mineral 30:249–287 Distler VV (1994)...geology and geochemistry of the Waterfall Gorge section of the Insizwa complex with particular reference |  | | Journal (issue) | | a great rarity. However recent discoveric in South Africa mean that g od hand pccimcns arc now readily...adamitecrystal2 mm acrossfrom PuttapaMine, Beltana,South Australia.This image is a combinationof 9 separateslices...per anally may be available through friends or a local ociety. Using the combination technique with a digital...nickeliferous deposits at Waterfall Gorge, Insizwa, Pondoland, Transkei, South Africa. There was insufficient...Canada Sudbury, Canada Ban Phuc, Vietnam Insizwa, South Africa 10.11 10.05 9.80 10.16 9.98 9.89 9.82 9 |  | | Book | | Bushveld chromite–platinum group metals (PGMs), South Africa, Sudbury nickel–copper, Canada, and a few new...occurrences/deposits/mines of six continents: Africa, North America, South America, Asia, Oceania (including Australia)...Earth’s element family. The working deposits in South Africa and Russia are by far the largest for the PGM...significant in Canada, United States, Australia, Africa, Brazil, New Caledonia, Philippines, Indonesia...Caribbean. The largest chromite deposits are in South Africa, Zimbabwe, Kazakhstan, Turkey, Finland, and |  | Seat, Z., Mary Gee, M. A., Grguric, B. A., Beresford, S. W., Grassineau, N. V. (2011) The Nebo-Babel Ni-Cu-PGE Sulfide Deposit (West Musgrave, Australia): Pt. 1. U/Pb Zircon Ages, Whole-Rock and Mineral Chemistry, and O-Sr-Nd Isotope Compositions of the Intrusion, with Constraints on Petrogenesis. Economic Geology, 106 (4) 527-556 doi:10.2113/econgeo.106.4.527 | Journal (article/letter/editorial) | | NORTHERN TERRITORY Amadeus Basin WOOD ROFFE THRUS T SOUTH AUSTRALIA MAN N WESTERN AUSTRALIA FAULT 27°S...metamorphic rocks Wingellina NORTHERN TERRITORY Hills SOUTH AUSTRALIA TO na ve Ca M gh e ng Ra Tollu Mum...15 vol percent amphibole, biotite, apatite, and ilmenite. Sulfide minerals are absent. (Ma) Warakurna...10° plunge toward southwest and a 15° dip to the south. In general, deformation is confined to shear zones...augite, Bt = biotite, Hbl = hornblende, Ilm = ilmenite, Mag = magnetite, Ol = olivine, Opx = orthopyroxene |  | | Journal (volume) | | the intercumulus of the ultramafic cumulates; ilmenite, chlorapatite and zirconolite occur as daughter...inclusions in olivines and orthopyroxene. Chlorapatite, ilmenite and loveringite are the most common Doppelgänger...associated with oxides (chromite, ilmenomagnetite, ilmenite). Evidently the PGM phases crystallized from the... The Keivitsa intrusion (age 2057 Ma) is located south of the Koitelainen intrusion. Isotopic (Sm-Nd, S-isotopes...Survey of Finland hornblende ilmenite magnetite with exsolved ilmenite type intrusion – Keivitsa-type |  | | Book | | contents, say of lead or bismuth or uranium ? Is it a local, continuous, comparatively superficial cycle, t...mixture of unmixed titanomagnetite with little ilmenite) in some anorthosites and norites; and perhaps...differentiation (e.g., at the Frood Mine and at Insizwa) bismuth and tellurium minerals are also found...pyrrhotite, pentlandite, and cubanite. Skeletal ilmenite proves the nature of the process. The peculiar...peculiar bornite occurrences in the Ookiep area, Cape Province, are on one hand typical transition deposits; |
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