 | | Journal (article/letter/editorial) | | Mineralogist, Volume 76, pages561-573, 1991 Ti-rich chromite from the Mount Ayliff Intrusion, Transkei: Further...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...Karoo Igneous Province of South Africa have been studied. Many analysesof chromite grains enclosedin olivine...tholeiitic chromite and cannot be related by fractional crystallization to the Ti-rich chromite trends in |  | | Journal (article/letter/editorial) | | NiâCuâPGE 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 dâInsizwa de la masse intrusive |  | | Journal (article/letter/editorial) | | tectonics, magmatism, and mineralisation of the South African Precambrian shield is discussed. A geosynclinal...five times as long as the post-Precambrian. The South African shield appears highly suitable for investigations...preserved and well exposed. The Precambrian in southern Africa comprises a more or less continuous suite ofmetasediments...of more than 35,000 m. Furthermore, in southern Africa the earth's history, at least in outline, appears...mineralisation. There is hardly anywhere else in Africa an orogenic zone to which this applies. Recent |  | | 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 Š 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 |  | 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)...platinum-group elements)andthose Geologyof the Insizwa Fe-Ni-Cu Sulfide Deposits predictedon the basisof...mined camefromthe WaterfallGorgesectionof the Insizwa * Presentaddress:GoldfieldsExplorationPty. Ltd...sulfides FIG. 1. Schematicdiagramof the baseof the Insizwa Complex at Waterfall Gorgeshowingrelationshipsbetweencountryrocks |  | | Journal (article/letter/editorial) | | Geology, Rhodes University, Grahamstown 6140 (South Africa) (Received October 16, 1979; accepted for publication...Both major- and trace-element data for the large Insizwa layered complex indicate retention of 20% parental...self-consistent for several elements. In the case of the Insizwa intrusion, the data further identify a class of...sediments, and, where well exposed in the Matatiele district (30°11'S, 29°07'E) has the form of an undulating...St, Ti, Y, P, Ni and Co in dolerites of the Eastern Cape Province (Table I, N o . l ) as determined by |  | | 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...Russia); froodite (Sudbury, Canada); leadamalgam, chromite, ilmenite, magnetite, gersdorffite, pyrite, chalcopyrite...Distribution: From the Insizwa CuâNi deposit, Waterfall Gorge, Eastern Cape, South Africa [TL]. At Monchegorsk |  | 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 Voiseyâs Bay, after Lightfoot et al. (2012)...deflected close to the contact line to achieve local textural equilibrium. (c) Axial cross section of...dihedral angles for sulfide against olivine and chromite are sensitive functions of temperature and melt...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 |  | | Journal (article/letter/editorial) | | distinctive compositional spectrum, from normal chromite to Ti-enriched aluminous magnetite. In the Talnakh...but generally advanced reaction between cumulus chromite grains and solidifying trapped intercumulus liquid...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 Norilâsk on the eastern margin of the flood basalt...occasionally forms intergrowths with subhedral chromite (Fig. 3B). The upper Cr spinel-bearing unit shows |  | | Journal (article/letter/editorial) | | formations. CONTENTS TEXT Introduction Acknowledgments Insizwa intrusion Bushveld complex Kungwe Bay lopolith...Field studies of the Insizwa intrusion and the Bushveld complex in South Africa, the Great Dyke in Southern...many lopoliths such ILLUSTRATIONS Figure Page 1. Insizwa intrusion 290 2. Bushveld igneous complex 291 3...Levack to Gertrude... 297 as the Bushveld and Insizwa intrusions is parallel to the bedding of the country...eorsion. INSIZWA INTRUSION BUSHVELD COMPLEX Along the southeast and eastern edge of the Insizwa intrusion |  | | Journal (article/letter/editorial) | | Geology, Rhodes University, Grahamstown 6140 (South Africa) (Received November 17, 1981; accepted for publication...pyroxenite of Merensky Reef, Bushveld Complex, South Africa. Means of 7 spinel and 7 orthopyroxene grains...2 (Dawson and Smith, 1975). 5 = basal picrite, Insizwa layered complex, Transkei (analyses by author)...curve suggests that 65 essentially Al-free chromite may coexist with orthopyroxenes showing (A1/Cr)°ct...complexes (e.g., Bushveld, Great Dyke of Zimbabwe and Insizwa complexes) are juxtaposed in Figs. 2--5 with those |  | | 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...300 m thick, which contains cumulus olivine and chromite in the ratio 98.5 to 1.5. There is generally an...variable proportions of cumulus olivine (Fig. 4) and chromite, with abundant subhedral plagioclase and anhedral |  | | Book | | and human beings. When I first visited Sukinda chromite belt in 1964, it was a sleeping hamlet, gifted...the area was only for small-scale production of chromite ore for the indigenous market. M/s Ferro Alloys...thesis on the Sukinda chromite deposits of Orissa, India. Mining for chromite had just begun in the country...country. The chromite belt was located in a valley between the Mahagiri and the Daitari hill ranges....myself that I would return to the platinumânickelâchromite industry at an opportune phase and share my knowledge |  | | Journal (article/letter/editorial) | | b Mineral Services South Africa, Cape Town 7430, South Africa c University of Cape Town Kimberlite Research...Research Group, Cape Town 7700 South Africa d Mineral Services Canada, North Vancouver, British Columbia...Introduction Ilmenite, together with pyrope garnet and chromite, is one of the dominant indicator minerals found...areas hosting kimberlite intrusions. In Southern Africa, ilmenites are present in the volcanic successions...those found in the Mount Ayliff Intrusion of the Insizwa Complex in Transkei (Cawthorn et al., 1988). The |  | | Report (issue) | | Branch of Distribution, U.S. Geological Survey, 604 South Pickett Street, Alexandria, VA 22304 CONTENTS...(i.e. Eocene) age in the Gippsland basin. In the South American San Jorge basin, the petroleum-bearing...Cretaceous Chubut Group which post-date the Africa-South America separation and thus bear no relation...to the petroleum-rich Benue Trough area of West Africa. In this report I review the available geophysical...semicircular area (fig. 1) lying mainly in the Eastern Hemisphere is known as East Antarctica. There the |  | | Journal (article/letter/editorial) | | the Insizwa sill (South Africa), the Great Dyke (Zimbabwe), and the Bushveld Complex (South Africa). We...the Insizwa Sill in South Africa, the Great Dyke in Zimbabwe, and the Bushveld Complex in South Africa... Additional data from surface outcrops of the Insizwa Sill and the Bushveld Complex are integrated. The...kilometers in length (e.g., Bushveld Complex in South Africa). In the Phanerozoic, these intrusions tend...Accessory minerals, such as apatite, phlogopite or chromite, do not generally contribute substantially to |  | | 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; |  | | Journal (article/letter/editorial) | | liquid in orthocumulares. The calculation assumes local equilibrium between phases, and that the system...in Cr wards from the base of the Insizwa Complex in South Africa is attributed by Lightfoot et al. (1984)...exchange reactions with country rocks. Both the Insizwa and La Perouse data may be explained more simply...circulating pore fluid. The existence of large local variability in mineral compositions on a scale of...development of gabbro pegmatites beneath adcumulate chromite seams in the Stillwater Complex as described by |  | | Journal (article/letter/editorial) | | species there erected. A. G. B. THE GEOLOGY OF SOUTH AFRTCA. By A. L. DU TOIT. pp. x + 463, with 39...on the geology of South Africa generally, and by Rogers and du Toit on that of Cape Colony, the subject...there have been great developments, not only in the local geology of the Union, but very much has been done...correlation with other parts of Africa. ReviewsâThe Geology of South Africa. 283 It is obvious then that...stratigraphical equivalence of the Malmesbury series of the Cape Province was very uncertain, and there were other |  | | Book | | t a t e d Bibliographies of Mineral Deposits in Africa, Asia (exclusive of t h e U S S R ) a n d Australasia...him. I have tried to include all ore districts in Africa, Asia (exclusive of the U.S.S.R.)> and Australasia...incluir todos los distritos mineros conocido en Africa, Asia (con exclusion de la Union SoviĂŠtica), y...Greenland. This volume covers mineral deposits in Africa, Asia exclusive of the U.S.S.R., and Australasia...Philippines, and Japan are included with Asia. In South Africa, the deposits are arranged by prov inces, in |  | | Journal (article/letter/editorial) | | Springer-Ver[ag1993 Crystallization of titaniferous chromite, magnesian ilmenite and armalcolite in tholeiitic...the Witwatersrand, P O Wits, 2050, Republic of South Africa 2 Department of Geology and Geophysics, University...Accepted December 10, 1992 Abstract. Titaniferous chromite (up to 8 wt% TiO2) and magnesian ilmenite (up...Ayliff Intrusion in the Karoo Province of southern Africa, suggesting that the original magma was TiO2-rich...compositions are atypical of tholeiitic magmas, in which chromite usually has less than 1 wt% TiO2, ilmenite less |  | | Journal (article/letter/editorial) | | elsevier.com/locate/lithos Mineral chemistry of chromite from the Permian Jinbaoshan PtâPdâsulphide-bearing...Department of Geological Sciences, The University of South Carolina, Columbia, SC 29208, USA Received 8 July...rocks having N0.5 ppm Pt and Pd, contain abundant chromite (up to 20 vol.%) and minor sulphide (b3 vol.%)...and thus clearly crystallized after olivine and chromite. Olivine occurs as euhedral, subhedral or rounded...%). There are two types of chromite: (1) relatively homogeneous chromite, as euhedral inclusion in olivine; |  | Ruan, Banxiao, Yu, Yingmin, Lv, Xinbiao, Feng, Jing, Wei, Wei, Wu, Chunming, Wang, Heng (2017) Occurrence and mineral chemistry of chromite and related silicates from the Hongshishan mafic-ultramafic complex, NW China with petrogenetic implications. Mineralogy and Petrology, 111 (5) 693-708 doi:10.1007/s00710-016-0480-0 | Journal (article/letter/editorial) | | ORIGINAL PAPER Occurrence and mineral chemistry of chromite and related silicates from the Hongshishan mafic-ultramafic...available to authorized users. and zoned type 3 chromite has compositional variation from core to rim and...type 3 chromites. The parental melt of type 1 chromite has an estimated composition of 14.5 wt% MgO,...nature and high Mg and Ti contents. Compositions of chromite and clinopyroxene are distinct from those of Alaskan-type...chromites are classified as ferrous chromite and the rims as ferrian chromite. The formation of ferrian rim |  | | Report (edition) | | bookseller 1936 Price 3s. Net IMPERIAL INSTITU1¡¡E SOUTH KENSINGTON, S.W. 7 Ts E~ Imperial Institute was...Protecto1¡ate .. Southe1n Rhodesia ⢠⢠⢠⢠Union of South Africa ⢠⢠⢠⢠Canada .. â˘â˘ ⢠⢠⢠⢠Newfoundland â˘...Empire, especially in Canada and the Union of South Africa. During 1913, Russia was responsible for over...the list of producers of the platinum metals. South Africa has large reserves of platinum ore, and is the...as in the alluvial gold workings of the Choco district, it was usually thrown away as worthless, although |  | | Journal (article/letter/editorial) | | Dolerites Associated with the Karroo System, South Africa. By A. DALY, Harvard University, and TOM BARTH...W. (SHALER MEMORIAL SERIES.) INTRODUCTION.âThe South African intrusive dolerites (fresh diabases), dating...Jurassic, are particularly abundant in Natal and Cape Province, but are represented also in the Orange...Free State, Transvaal, Southern Rhodesia, South-west Africa, and even as far north as Nyasaland.1 As dikes...here used in deference to the tradition of the South African geologists. Yet the rocks considered are |
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