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| Pyroxene-Ilmenite Intergrowth from the Monastery Mine, South Africa J. B. DAWSOn" Department of Geology...in a xenolith from the kimberliteMonastery Mine, South Africa, may be derived by exsolution from a single...now classic treatises on the kimberlites of South Africa, both Wagner (1914) and Williams (1932) make...of the Monastery Mine, a small intrusion on the Farm Monastery, 10 miles north-west of Clocolan, in the...the eastern Orange Free State. Wagner (op. cir., p. 152) described nodules consisting of "regular intercrystallisations" |
 | 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) |
| Earth and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695, USA Institute for...multi-element analysis of material in any physical state—gas, liquid, or solid [1]—and has particular attributes...the high-temperature plasma into a collection of free electrons plus weakly ionized molecular, atomic...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 |
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| chrysoberyl • Diamond faceted as iconic Apple logo • Two pairs of antique Mughal spectacles with diamond and emerald...inclusions • Radioactive green diamond • Rainbow graining in diamond • Monazite (?) in quartz • Spiral...sales of pink and blue diamonds from the Argyle mine • Chalcedony-epoxy composite imitation of “candy...Paris, France New York, New York Johannesburg, South Africa Al Gilbertson Laura Otter Wuyi Wang Carlsbad...Schmetzer traces the history of the Habachtal emerald mine through several centuries up to World War I, using |
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| mechanismsof diatreme formation, and the parageneses of diamond will find much to excite them in Volume I of these...FROM 15 KIMBERLITES A Diamond-Graphite Ecologite From the Roberts Victor Mine, C. J. Hatton and John...Gurney ........................................ Diamond and Graphite in Eclogite Xenoliths From Kimberlite...Granulites and Eclogites From Lesotho, Southern Africa, W. L. Griffin, D. A. Carswell, and P. H. Nixon...Garnet Harzburgite XenolithsFrom the Premier Mine, South Africa, R. V. Danchin ........................ |
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| relevant protective laws and regulations and therefore free for general use. 2132/3130-543210 To my wife,...geology; as a result I have not attempted to describe diamond prospecting and mining and, although I have attempted...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. . . . . . . . . . |
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| 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 |
 | Palot, M., Pearson, D.G., Stachel, T., Stern, R.A., Le Pioufle, A., Gurney, J.J., Harris, J.W. (2017) The transition zone as a host for recycled volatiles: Evidence from nitrogen and carbon isotopes in ultra-deep diamonds from Monastery and Jagersfontein (South Africa) Chemical Geology, 466. 733-749 doi:10.1016/j.chemgeo.2017.07.023 | Journal (article/letter/editorial) |
| isotopes in ultra-deep diamonds from Monastery and Jagersfontein (South Africa) M. Palot, D.G. Pearson, T. Stachel...isotopes in ultra-deep diamonds from Monastery and Jagersfontein (South Africa), Chemical Geology (2017), doi:...isotopes in ultra-deep diamonds from Monastery and Jagersfontein (South Africa) IP T M. Palota*, D. G. Pearsona...University of Cape Town, Rondebosch, Republic of South Africa. d School of Geographical and Earth Sciences...C- and N- isotopic data for diamonds from the Monastery and Jagersfontein kimberlites that sample the |
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| garnets from the subcontinental mantle of southern Africa David R. Bell and George R. Rossman Division of...occurring as xenoliths in kimberlites of southern Africa. OH abundances, using the best currently available...megacryst magmas. Subcalcic Cr-rich xenocrysts, diamond inclusion garnets and garnets from diamondiferous...garnets from the wellstudied kimberlites of southern Africa, and to determine if these variations are linked...from xenoliths erupted in kimberlites of southern Africa. This area was chosen for study due to ready sample |
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| 6140, South Africa. e-mail: andy.moore@info.bw © 2009 March Geological Society of South Africa ABSTRACT...stones represent a third and hitherto unrecognised diamond paragenesis. Their isotopic signature is closely...fugacities between the WM and IW, would be in the diamond P-T-fO2 stability field. The low N concentrations...largest gem diamond ever found, the 3106 Cullinan, recovered from the Premier Mine, South Africa (Williams...this locality having the world’s highest average diamond value ($2500/ct) for a kimberlite, and being the |
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| THE PRESSURES AND TEMPERATURES OF FORMATION OF DIAMOND BASED ON THERMOBAROMETRY OF CHROMIAN DIOPSIDE INCLUSIONS...temperature (T) and pressure (P) of formation of natural diamond has generally relied on thermobarometry of rare...potential re-equilibration of touching minerals after diamond growth and possible disequilibrium between non-touching...inclusions of chromian diopside (mostly isolated) in diamond crystals containing inclusions of peridotitic material...conditions and relative timing of diamond genesis. Inclusions in diamond and xenoliths from the same source |
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| of Geology, Rhodes University, Grahamstown, South Africa. African Queen Mines Ltd., Box 66 Maun Botswana...bots@gmail.com © 2014 December Geological Society of South Africa ABSTRACT Type II (N-poor) diamonds do not constitute...crystallization of megacrysts across the graphite-diamond inversion curve, and thus within the lithosphere...immediately prior to kimberlite eruption. The websterite diamond suite is thus directly linked to megacryst crystallization...megacryst magmas. Reduction of boron to the metallic state is ascribed to buffering of the megacryst magma |
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| and Department of Geological Sciences, Arizona State University, Tempe AZ 85287-1604, U.S.A. Department...Sciences, University of Cape Town, Rondebosch 7700, South Africa e-mail: David.R.Bell@asu.edu Rory O. Moore...Town, Rondebosch 7700, South Africa Email: © 2004 Geological Society of South Africa ABSTRACT Xenoliths...subcontinental lithospheric mantle of southern Africa, and may be used to probe its compositional structure...garnet megacrysts from 61 kimberlites in southern Africa define four broad arrays on the basis of Cr2O3 |
 | HANSON, E.K., MOORE, J.M., BORDY, E.M., MARSH, J.S., HOWARTH, G., ROBEY, J.V.A. (2009) CRETACEOUS EROSION IN CENTRAL SOUTH AFRICA: EVIDENCE FROM UPPER-CRUSTAL XENOLITHS IN KIMBERLITE DIATREMES. South African Journal of Geology, 112 (2) 125-140 doi:10.2113/gssajg.112.2.125 | Journal (article/letter/editorial) |
| A. ROBEY 125 CRETACEOUS EROSION IN CENTRAL SOUTH AFRICA: EVIDENCE FROM UPPER-CRUSTAL XENOLITHS IN KIMBERLITE...Rhodes University, P.O. Box 94, Grahamstown, South Africa email: emilykhanson@gmail.com; j.moore@ru.ac...Kimberley, South Africa email: jock.robey@debeersgroup.com © 2009 June Geological Society of South Africa ABSTRACT...fourteen Group I kimberlite diatremes in central South Africa were examined for upper crustal xenoliths in...eruption (~85 Ma), they were restricted to the south-eastern half of the study area. At the latter time |
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| from 16 intrusions in Lesotho, the Republic of South Africa, and Tanzania have been investigated. The following...properties of the kimberlitic zircons and the diamond grade of their host rocks. Introduction Zircon...kimberlite. Zircon has been recorded as inclusions in diamond (MEYER and SVlSERO 1973) and magnesian ilmenite...Ilmenite-zircon intergrowths are particularly common at Monastery mine (WHITELOCK 1973). Among the inclusions in zircon...1973b) found diamond, magnesian ilmenite and phlogopite in the zircons from Kao and Monastery mines. Recently |
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| Archean basement (Congo– Kasai Craton) and is diamond-rich, whereas Kundelungu cuts across Paleoproterozoic...Paleoproterozoic basement (Bangweulu block) and is diamond-poor. The megacryst suites (or discrete nodule suites)...megacrysts are similar to those from metasomatized South African mantle lherzolites. The differences in composition...Congo (DRC): the diamond-rich Mbuji-Mayi (formerly Bakwanga) province (Kasai) and the diamond-poor Kundelungu...general context of kimberlites of Central and South Africa. Inset from Foster et al. (2001). Burgess and |
 | Garcia-Vallès, M., Gimeno-Torrente, D., Martínez-Manent, S., Fernández-Turiel, J.L. (2003) Medieval stained glass in a Mediterranean climate: Typology, weathering and glass decay, and associated biomineralization processes and products. American Mineralogist, 88 (11) 1996-2006 doi:10.2138/am-2003-11-1244 | Journal (article/letter/editorial) |
| works (Santa Maria del Mar and the Pedralbes Monastery church in Barcelona, and the Tarragona Cathedral...when compared with most Central European glasses. State of the art Glass is made up of several components:...Barcelona and the third in Tarragona, some 100 km south. The two sites in Barcelona are the presbytery in...in the church in the Santa Maria de Pedralbes monastery and the large rosette from the main façade of...of Santa Maria del Mar church. The monastery and church of Santa Maria de Pedralbes was founded by the |
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| of Cape Town, Private Bag, Rondebosch 7700, South Africa* Abstract. Petrographic and chemical criteria...though markedly more abundant in the megacrystrich Monastery kimberlite, is Fe-rich relative to rim compositions...may prove to be a useful tool for evaluating the diamond potential of kimberlites. from Kentucky, USA (listed...of the South African kimberlites and both from Kentucky. The kimberlites from southern Africa for which...across the sub-continent (Letseng-la-terai and Monastery in the east, de Beers, Sover, Bellsbank and Newlands |
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| Indiana 47907 of California, Lawrence Although diamond has been known in India from antiquity the presence...Century igneous rocks, supposedly the hosts of diamond at Panna and Wajrakharur were described, but were...calcite, clay minerals and fragments of crustal and local host country-rock. At Lattavaram the kimberlite...Akimoto and Masaki Akaogi (Institute for Solid State Physics, University of Tokyo, Roppongi 7-22-1, Minato-ku...Iherzolite nodules in kimberlites(from Lesotho and South Africa) and were analysed for isotopic compositions |
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| suggesting that the oxidation state of the kimberlite, and thus its potential for diamond resorption, can be overestimated...populations correlate with increased potential for diamond resorption in a given kimberlite. Introduction...thought to contain informa tion on the oxidation state of the kimberlite, the host magma that transports...Fe 3+ /Fe 2+ ratios are associated with higher diamond contents than those with more Fe3+, whereas diamonds...at all." The kimberlites from the Iron Mountain district of Wyoming, USA (Smith, 1977; Eggler et al., 1979) |
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| occurring in the plastic deformation field of diamond have completely eliminated crystal structures which...exceptional sampling bias or, more likely, preferential diamond formation in eclogitic environments. This may be...of the transition zone being too reducing for diamond formation. It is speculated that sublithospheric...invoked to cause such signatures should convert to diamond at much shallower depth. Key-words: inclusions...to fully constrain the compositional and thermal state of the transition zone and the lower mantle. Important |
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| the Lesotho kimberlites (Nixon and Boyd 1973a), Monastery (Gurney et al. 1979; Moore et al., 1992; Griffin...Jagersfontein (Hops et al. 1989, 1992) in southern Africa. (The locations of these and other southern African...the Nouzees kimberlite in North-West Province, South Africa (Jones 1987). Paired high- and low-Cr ilmenite...sometimes referred to as Crown); 8 Kaalvallei; 9 Monastery; 10 Northern Lesotho cluster (Thaba Putsoa and...relatively Cr-rich ilmenite populations from the Monastery kimberlite, characterized by different and non-overlapping |
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| Science Letters 160 (1998) 831–843 Formation of diamond with mineral inclusions of “mixed” eclogite and...eclogitic mineral inclusions in the same diamond hosts. Diamond L32 contains seven Fe-rich garnets, four...one sanidine and one coesite were recovered from diamond S32. Both garnet and omphacite inclusions have...composition. All the garnet and omphacite inclusions in diamond L32 have positive Eu anomalies (Eu=Eu* 1.64 ¾ 1...diamonds with “mixed” mineral inclusions. Ascending diamond-bearing eclogite (recycled oceanic crust) entrained |
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| ............................ 126 5.3.3.2. West Africa ........................................... 126...11. 6.12. 6.13. 6.14. 6.15. 6.6.3 .1. Diverse South African Kimberlites (Dawson and Smith 1975, Smith...7.2. 2. Compositional Variation of Contamination-Free Kimberlites .......... 7.2 .2 .I. Intra-kimberlite.......................... 437 KIMBERLITES Ex Africa semper aliquid novi. Pliny The Elder, Natural...confluence of the Vaal, Orange, and Riet Rivers of South Africa in 1866-1867. The ebb and flow of prospecting |
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| kimberlites, South Africa Deon de Bruin Council for Geoscience, Private Bag X112, Pretoria, 0001, South Africa...ddbruin@geoscience.org.za © 2005 Geological Society of South Africa ABSTRACT Mineral chemistry of megacrysts from...southern African Group I kimberlites such as the Monastery kimberlite, whereas the High-Cr populations are...Witberg kimberlites from the Prieska region, South Africa. The Uintjiesberg kimberlite is situated off-craton...descriptions The Uintjiesberg (30°49’ south, 22°32’ east) and Witberg (29°11’ south, 22°21’ east) kimberlites are |
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| pyroxene-ilmenite intergrowths among xenoliths from South African Kimberlites is described. Chemical analyses...twice the minimum depth implied by the presence of diamond in kimberlites. Kimberlites containing the pyroxene-ilmenite...kimberlites of the Monastery Mine(Winberg Area, Orange Free State), the Frank Smith Mine (NW of Barkly West...kimbeflites from Tanganyika. He described the Monastery mine inclusions as "sheets of ilmenite in perfect...description of the similar inclusions from the Frank Smith mine established that in this case, the primary silicate |
