 | | Journal (article/letter/editorial) | | lithostratigraphy of the Riverton Formation, South Africa D. Claassen Council for Geoscience, P.O. Box...Box 5347, Walmer, Port Elizabeth, 6001, South Africa e-mail: dkilian@geoscience.org.za or debclaassen@gmail...debclaassen@gmail.com © 2018 September Geolocial Society of South Africa Abstract The Riverton Formation occurs intermittently...Vaal, Riet and middle Orange Rivers in the Northern Cape Province. These alluvial terrace deposits represent...37 m at the Riverton type area southeast of Barkly West. Middle and Late Stone Age artefacts indicate |  | | Journal (article/letter/editorial) | | 3, 223-235. The physical pmperti~ of garnet in diamond-kyanite-eclosite and diamondcorundum-eclogite ~te...garnet in six newlir available diamond eclosites. Garnets from diamond-bearing eclosites do not constitute...of New South Wales, ,4mtra//a; Morna Mathim, Divi6on of Geologiral Sciences, Uni~rsity oj Cape To~n, Rondebosch...Rondebosch, C. P. South Africa. Introduction Ultt ~mafic xenoliths, which do not resemble any rocks...(1967).Of the many types of these xenoliths, the diamond-bearing eclogites are among the most r~re, and |  | Defnet, Peter A., Wise, Michael A., Harmon, Russell S., Hark, Richard R., Hilferding, Keith (2021) Analysis of Garnet by Laser-Induced Breakdown Spectroscopy—Two Practical Applications. Minerals, 11 (7) 705 doi:10.3390/min11070705 | Journal (article/letter/editorial) | | Preservation of Cultural Heritage, Yale University, West Haven, CT 06516, USA Correspondence: rsharmon@ncsu...continental crust [5–8] and in the exploration for diamond-bearing kimberlites [9–12]. It also has potential..., Hawk Mine, NC, USA; Rutherford Mine, VA, USA; Little 3 Mine, Ramona, CA, USA; Golcando Mine, Minas...Mexico; Broken Hill, Australia; Ducktown Mine, TN, USA; Jeffrey Mine, QC, Canada). Garnetiferous kimberlite...from our kimberlite localities (e.g., Kimberly, South Africa; Garnet Ridge, AZ, USA), whereas uvarovite is |  | | Journal (article/letter/editorial) | | com/locate/lithos Re–Os systematics of diamond-bearing eclogites from the Newlands kimberlite A.H. Menzies a,1,...Geological Sciences, University of Cape Town, Rondebosch 7700, South Africa Department of Terrestrial Magnetism...of 14 diamond-bearing and 3 diamond-free eclogite xenoliths from the Newlands kimberlite, South Africa...of eclogites and diamonds. Re concentrations in diamond-bearing eclogites are variable (0.03 – 1.34 ppb)...more limited range (0.26 – 0.59 ppb). The three diamond-free eclogites have Re and Os concentrations that |  | | Book | | Diamond Geology Published on www.debeersgroup.com Index A) Classification and genetic models B) Exploration...Sample Treatment D) World Production E) South African Diamond Occurrences 1. Large Kimberlite Mines 1...kimberlites in South Africa 2.1 The Oaks 2.2 The Zebediela Kimberlites 2.3 The Bellsbank-Barkly West Area 2.4...River 3.3 Bushmanland 3.4 The Lower Orange River 3.5 West Coast Onshore Deposits 3.5.1 Koingnaas Complex 3...Alexander Bay 4. Marine Deposits (West Coast Offshore) F) Glossary of Terms Diamond Geology Page 2 www.debeersgroup |  | | Journal (article/letter/editorial) | | e g e o r ev Kimberlite-hosted diamond deposits of southern Africa: A review Matthew Field a,⁎, Johann...Southdale, 2135, South Africa c De Beers Group Services, PO Box 47, Kimberley, South Africa d De Beers Canada...April 2008 Keywords: Diamond Kimberlite Diatreme Pipe Dyke Mantle-xenolith Diamond-inclusion A B S T R...discovery of diamonds in river deposits in central South Africa in the mid nineteenth century, it was at Kimberley...economic and industrial development of southern Africa. Following the discoveries at Kimberley, even more |  | | Book | | monographs devoted to the petrology of primary diamond-bearing rocks. It should be noted that, in common...about upper mantle xenoliths or exploration for diamond. The principal objective of this work is to present...present a revised terminology for primary diamond-bearing rocks. To this end orangeites are recognized...discovery of these rocks in the Orange Free State of South Africa. The name is not a new one: In 1928, Percy Wagner...this day, highly speculative. Although primary diamond-bearing rocks are relatively rare rock types, they |  | Fitzpayne, Angus, Giuliani, Andrea, Maas, Roland, Hergt, Janet, Janney, Philip, Phillips, David (2019) Progressive metasomatism of the mantle by kimberlite melts: Sr–Nd–Hf–Pb isotope compositions of MARID and PIC minerals. Earth and Planetary Science Letters, 509. 15-26 doi:10.1016/j.epsl.2018.12.013 | Journal (article/letter/editorial) | | Sciences, Macquarie University, North Ryde 2109, New South Wales, Australia c Melbourne Isotope Geochemistry...Geological Sciences, University of Cape Town, Rondebosch 7701, South Africa b a r t i c l e i n f o Article...kimberlites (Kimberley) and orangeites (Newlands) from South Africa are used here to examine the source(s)...rocks may occur at depths corresponding to the diamond stability field (Meyer and McCallum, 1986). Age...from the Bultfontein kimberlite (Kimberley, South Africa). Based on these data, MARID genesis was interpreted |  | | Thesis/Dissertation | | ClI- 27 THE ALLUVIAL DIAMOND DEPOSITS OF THE LOWER VAAL RIVER BETWEEN BARKLY WEST AND THE VAAL-HARTS CONFLUENCE...CONFLUENCE IN THE NORTHERN CAPE PROVINCE, SOUTH AFRICA By FABRICE GILBERT MATHEYS B.Sc. (Hons) Thesis... ABSTRACT The between diamond deposits along the Vaal River, alluvial Barkly West and the Vaal-Harts...at most of these mineral s are locally derived. Diamond grade variations within the Younger Gravels are...Alluvial the tectonic the by channel width and diamond exploration setting, the palaeo- stability |  | | Journal (article/letter/editorial) | | chromian, garnet-rich peridotitic xenoliths from South African kimberlites Tim J. Ivanic • Ben Harte •...xenoliths from the diamondiferous Newlands and Bobbejaan kimberlites, South Africa. A high proportion of the...garnets and chromites in these rocks plot in the diamond-facies fields on Cr2O3–CaO and Cr2O3–MgO wt% plots...association with major orogenic events documented by South African crustal rocks at 2.9–2.7 Ga, and events...GeoScience, University of Edinburgh, King’s Buildings, West Mains Road, Edinburgh EH9 3JW, UK e-mail: ben.harte@glg |  | | 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) | | thermochronometry of lower crustal xenoliths, southern Africa Received: 15 February 2002 / Accepted: 23 September...offcraton continental lithosphere beneath southern Africa. The relatively low closure temperature of the...the ‘‘off-craton’’ Proterozoic domains of southern Africa indicates that their lithospheric thermal profiles...potential for diamond stability beneath both Proterozoic and Archean domains of southern Africa. Subsequent...craton-margins and off-craton regions of southern Africa. 1,p,a 1,p,a 1,p,a 1,p,a 1,p,f 1,p,f 1,p,f 1 |  | | Report (issue) | | Catalogue ian yan Sera a Age Artefacts from Southern Africa in The British Museum Peter Mitchell A with...Catalogue of Stone Age Artefacts from Southern Africa in The British Museum Peter Mitchell with contributions...Catalogue of Stone Age Artefacts from Southern Africa in The British Museum Peter Mitchell with contributions...cover:Acheulean handaxes and cleavers, Pniel, Northern Cape Province, South Africa (photograph, P. Mitchell) For acomplete...Southern Africa Physiography Climate Ecological zones Historical Geography of Southern Africa 2. Southern |  | Fitzpayne, Angus, Giuliani, Andrea, Hergt, Janet, Phillips, David, Janney, Philip (2018) New geochemical constraints on the origins of MARID and PIC rocks: Implications for mantle metasomatism and mantle-derived potassic magmatism. Lithos, 318. 478-493 doi:10.1016/j.lithos.2018.08.036 | Journal (article/letter/editorial) | | Ryde, 2109 New South Wales, Australia Department of Geological Sciences, University of Cape Town, Rondebosch...Rondebosch 7701, South MA 3 AC CE Corresponding author. PT E * D Africa ACCEPTED MANUSCRIPT Abstract...PIC samples from the Kimberley- D Barkly West area in South Africa. Similarities between compositions...xenoliths originate from the Kimberley kimberlites (South Africa), although MARID samples have also been found...1), as well as in orangeites in the Barkly West area (e.g., Newlands and Roberts ACCEPTED MANUSCRIPT |  | | Journal (article/letter/editorial) | | where the crystallization of spinel affects the local environment ahead of the growing spinel crystal...zoning and also on atoll-spinel formation. Very local conditions such as nucleation, or lack of nucleation...in the crystals therefore may be due to a very local effect caused by depletion of chromium in the immediate...Schulze Doden et al. (1998) Eendrag (II) Barkly West, SA Hypabyssal D. Schulze Schulze (2001) ...sample Nowicki et al. (2004) Frank Smith Barkly West, SA Hypabyssal D. Schulze Bell & Mofokeng |  | Krebs, M.Y., Pearson, D.G., Stachel, T., Laiginhas, F., Woodland, S., Chinn, I., Kong, J. (2019) A common parentage-low abundance trace element data of gem diamonds reveals similar fluids to fibrous diamonds. Lithos, 324. 356-370 doi:10.1016/j.lithos.2018.11.025 | Journal (article/letter/editorial) | | University, U.K 4 De Beers Group Exploration, South Africa 5 De Beers Canada * Corresponding author...Gemological Institute of America, 4th Floor, 50 West 47th Street, 10036 US AN M AC CE PT ED New...data from high-purity gem diamonds from the Victor Mine, Ontario, Canada as well as near- gem diamonds from...eclogite xenoliths from the Finsch and Newlands mines, South Africa, acquired using an off- line laser ablation...signature indicative of original derivation of the diamond forming agent AC during major melting (~10 % |  | | Journal (article/letter/editorial) | | of orangeites (Group II kimberlite) from southem Africa. Phlogopite grains from the Damodar alkaline rocks...depths of >150 km, within the stability field of diamond. KEYWORDS: orangeite, Group II kimberlite, 4~...Introduction UNDERSTANDINGthe origin of primary diamond deposits requires an accurate knowledge of the...al., 9 1998 The Mineralogical Society craton, diamond. 1983; Middlemost et al., 1988; Rock et al., 1992)...orangeites from the Kaapvaal craton, South Africa, and the diamond-rich (5 CM/100 t) Aries kimberlite, |  | | Journal (article/letter/editorial) | | [41 GREEN GARNETS FROM THE NEWLANDS KIMBERLITE, CAPE PROVINCE, SOUTH AFRICA D.B. CLARKE 1 Department...crystals of green, uvarovite-rich garnet from the Newlands kimberlite have been analysed. The range ofCr20...Yakutia. By combining data from both the Russian and South African occurrences, four models are considered...the Newlands area as another documented locality of Ca,Cr-rich garnets in kimberlite. The Newlands kimberlite...pipes are located 60 km northwest of Kimberley, Cape Province, and consist of five small blows (diameters |  | | Journal (article/letter/editorial) | | moore@mineralservices.com © 2004 Geological Society of South Africa ABSTRACT New whole rock chemical and Re-Os...Ga. Compared to two well-studied localities from west of the Colesberg lineament that may mark a 2.9 Ga...mean TMA observed for Kimberley (2.93 Ga) and Newlands (3.18 Ga) peridotites. Similarly, the maximum...maximum TRD obtained at Kimberley (2.95 Ga) and Newlands (3.22 Ga) span the maximum TRD observed at Monastery...of lithospheric mantle peridotite from southern Africa (Walker et al., 1989; Pearson et al., 1994; 1995; |  | | Book (volume) | | l ..,_ • ••' f..J r) THE GENESIS OF T H E DIAMOND By ALPHEUS F. WILLIAMS, B.Sc. GENERAL MANAGER...of the rise and development of the diamond mines of South Africa, from an historical, economic and technical...account of the development of the De Beers group of diamond mines, together with an account of the famous people...played such a great part in the development of the diamond industry and at a later date in the development...the diamond fields when the mines in the Kimberley and Jagersfontein areas were the only diamond mines |  | (Fanus) Viljoen, K.S., Dobbe, René, Smit, Braam, Thomassot, Emilie, Cartigny, Pierre (2004) Petrology and geochemistry of a diamondiferous lherzolite from the Premier diamond mine, South Africa. Lithos, 77 (1) 539-552 doi:10.1016/j.lithos.2004.03.023 | Journal (article/letter/editorial) | | diamondiferous lherzolite from the Premier diamond mine, South Africa K.S. (Fanus) Viljoen a,*, René Dobbe...Mines Limited, P.O. Box 82232, Southdale 2135, South Africa Laboratoire de Géochimie des Isotopes Stables...peridotite xenolith from the Premier diamond mine in South Africa. The xenolith is altered with pervasive...6 x to 1.3x. These are broadly correlated with diamond nitrogen content as determined by infrared spectroscopy...Metasomatism occurred prior to, or accompanied, diamond growth. D 2004 Elsevier B.V. All rights reserved |  | | Book | | stationery while vacationing on the Natal Coast of South Africa. Wilson uses it as a symbol of the Ivory Coast...Coast. DIAMONDS: FROM BIRTH TO ETERNITY A diamond is rarely found embedded in kimberlite rock. This...update its diamond mining and reeovery inlormation, we asked the assistance ol John Roux, Diamond Information...blood, my father (a distinguished editor ol the Cape Times) having been one ol lour sons ol a sullragan...to present Arthur Wilson’s compilation on the diamond and its origins. Richard T. Liddicoat, Jr. CONTENTS |  | | Journal (article/letter/editorial) | | Kroonstad group II kimberlite (orangeite) cluster, South Africa: Evolution of the magma within the cluster Geoffrey...Rhodes University, P.O. Box 94, Grahamstown, South Africa a r t i c l e i n f o Article history: Received...evolutionary trend is also linked with diamond characteristics. In particular diamond parcels at the Voorspoed pipe...town of Kroonstad in the Free State Province of South Africa (Fig. 1) and is made up of six pipes and numerous...believed to be unique to the Kaapvaal Craton, South Africa, however recent studies present data indicating |  | | Book | | geology; as a result I have not attempted to describe diamond prospecting and mining and, although I have attempted...with whose research groups at the universities of Cape Town and Chicago I have had long and fruitful collaboration...collaboration. Much of my fieldwork in southern Africa has been carried out with the cooperation and assistance...7.3 2.8 2.9 Africa . . . . . . . . . . . . . . . . . . . . . . . . . . . . West Africa . . . . . . .... . . . . Central Africa. . . . . . . . . . . . . . . . . . . . . . . East Africa. . . . . . . . . . |  | | Journal (article/letter/editorial) | | Sciences, University of Cape Town, Rondebosch, 7700, Republic of South Africa of Geological Sciences...formation event documented on the world’s major diamond producing cratons occurs in Archean lithospheric...diamonds, G10 garnets, and diamond inclusion-type chromites, well used in diamond exploration. Within the...mantle domains of diamond stability, there have been repeated episodes of further diamond crystallization...peridotite. Using improved methods of isotope analysis, diamond formation ages can be correlated with specific |
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