 | | Journal (issue) | | geology, and notable localities of diamond mining in Brazil, and outlines plans for future diamond production... Svisero, James E. Shigley, and Robert Weldon Brazil, which commanded global production in the 1700s...principally in the states of Minas Gerais and Mato Grosso, are presented. W hile Brazil is widely known for...Jequitinhonha River near the village of Arraial do Tijuco (later named Diamantina) in the state of Minas Gerais...and Bartorelli, 2010). For the next 150 years, Minas Gerais was the world’s major supplier of gem diamonds |  | | Journal (article/letter/editorial) | | (1994) The origin of diamonds in western Minas Gerais, Brazil G.M. Gonzaga 1, N.A. Teixeira 2, and J.C...70380-760 Brasilia, Brazil 2 NTX Consultoria SQN 215 BI. A Apt. 302, 70874-010 Brasilia, Brazil 3 GMP Instituto... Universidade de Brasilia, 70910-900 Brasilia, Brazil Received: 14 May 1993/Accepted: 1 February 1994...mineralized alluvium/colluvium occurs in western Minas Gerais (WMG) in the Brasilia Orogenic Belt (700-450...origin of diamonds from western Minas Gerais (WMG), including the Coromandel area in the Trifingulo Mineiro |  | | Journal (issue) | | 0026-4628 'Continued on p. 415 Articles Diamonds in Brazil .................................................Moore Phosphate minerals from the Leveaniemi iron mine, Svappavaara, Sweden .............................Hollabaugh Laueite from Hagendorf-Siid andthe Palermo mine ................. 363 by L. C. Pitman New data...image of a crack hidden in the back (roof) of a mine adit (from A. P. Annan etal. (1988) Radar sounding...Fundao 21.910 Rio de Janeiro, Brazil Since their discovery in Minas Gerais, near the town of Diamantina |  | | Journal (issue) | | found in the seas off the south-eastern USA to Brazil and N. subnodosus in the seas off western Central...Physics/ICEB, Federal University ofOuro Preto, Minas Gerais, Brazil 2. Department of Mining and Geology, Federal...Federal University of Paraíba, Brazil Abstract: Over the past decade, there has been noticeable growth...Laboratory of Great Britain (Shigley et ah, 2000) and Brazil (Ferreira, 1997) have sparked renewed interest...the only garnet variety that does not occur in Brazil (Delaney 1996). Colour-change garnets found in |  | | Journal (issue) | | materials such as glass, 'intermediate' zircon and 'low' or metamict zircon have much wider ranges of RI and...refractive index in the region of, say, 1.8 ('low' zircon, almandine, spessartite). By taking the computer...Cearâ-Brésil. (Gamets of Poço dos Cavalos, Cearâ, Brazil.) Revue de Gemmologie, 62, 5-8,9 figs, 1980. The...found near the village of Mwakijembe in the Umba Valley of Tanzania. RI is given as 1.75-1.76. A variety...Grande de Sol [sic? Rio Grande do Sul] in southern Brazil. M.O'D. KANE (R. E.). Developments and highlights |  | GIBSON, S. A., THOMPSON, R. N., LEONARDOS, O. H., DICKIN, A. P., MITCHELL, J. G. (1995) The Late Cretaceous Impact of the Trindade Mantle Plume: Evidence from Large-volume, Mafic, Potassic Magmatism in SE Brazil. Journal of Petrology, 36 (1) 189-229 doi:10.1093/petrology/36.1.189 | Journal (article/letter/editorial) | | GEOCIENCIAS, UNIVERSIDADE DE BRASILIA, 70910 BRASILIA DF, BRAZIL 'DEPARTMENT OF GEOLOGY, McMASTER UNIVERSITY, is8o...plutonic comAlto Paranaiba Igneous Province, in SE Brazil, is one of the plexes at ~ 85 Ma. Reconstructions...is one Late Cretaceous alkaline magmatism in SE Brazil may have of several Cretaceous alkaline igneous...around the margin of the Parana sedimentary basin in Brazil subcontinental lithosphere. Heat penetrating the...from Large-volume, Mafic, Potassic Magmatism in SE Brazil JOURNAL OF PETROLOGY VOLUME 36 Potassic-rich |  | | Book (volume) | | ANDFINSCH KIMBERLIT'ES, SOUTHAFRICA, ANDWILLIAMSON MINE, TANZANIA H.-M. Tsai, O. A. Meyer, 0. Moreau, and...FROM KIFYBERLiTES IN THE COLORADO-WYC•ING STATE mINE DISTRICT 42 M. E. McCal!um, C. D. Mabarak, and... J. Ferguson, an• L. P. Black KiPzBERLIT•S IN BRAZIL: •i• INITIAL and DIAMOND C. R. Clement, REPORT...MINERAL CHEMISTRY OF A KIMBERLITE FROM THE PR•I•IER MINE: I•iPLICATIONS FOR THE EVOLUTION OF KiFmEHLITIC...mantle. In tro duct i on Introduction kimberlite mine The The Finsch Finsch Pipe Pipe is is aa major kimberlite |  | | Book | | The Emperor Seamount Chain. 50 Hot Spot Theory of Brazil kimberlites. 62 Dr Gordon Davis. 65 Dr John J....Kimberley Mine . 140 The "Big Hole of Kimberley" today. 141 The open pit of the Kimberley Mine in 1880...Rose (Color Plate) . 155 Cutaway view of Premier Mine kimberlite pipe. 159 Dr Hans Merensky . 162 The...219 Mr Harry F. Oppenheimer. 221 Letseng-la-Terai Mine (Color Plate) . 223 Map of Botswana. 225 Cube shaped...(Color Plate). 243 Main localities of diamonds in Brazil. 247 The Roraima Formation. 251 Map of Guyana. |  | | Journal (issue) | | the spectroscope in seeing absorption bands in zircon and almandine garnet. He mentioned the tiny diamonds... 522 J.Gemm., 1981, XVII, 8 GARNETS FROM UMBA VALLEY, TANZANIA: IS THERE A NECESSITY FOR A NEW VARIETY...Idar-Oberstein, W.Germany ABSTRACT The garnets from Umba Valley, Tanzania, consist of solid solution series of...originate from one or more placer deposits in the Umba Valley, Tanzania, and were first sold without an exact...investigations of other garnet specimens from the Umba Valley. The so called 'Malaya-garnets' are members of |  | | Journal (issue) | | feldspar from Congo • Fluorite from the Rogerley mine, England • Demantoid garnet from Iran • Kyanite...tourmaline has come from Madagascar’s Anjanabonoina mine and contains remarkable color zoning, as shown by...Queen pegmatite mine in the Pala district of San Diego County, California, with mine owner Ed Swoboda...Swoboda. This mine has produced large amounts of gem tourmaline, for cut stones and mineral specimens. Photo...amount of surface abrasion, like the (much softer) zircon on the right. Abrasion and scratches are related |  | | Book | | L.V. 558 Zeilic B.S. 682 648,649 Zhang H. Valley J.W. 83 Zhang P. Vannucci R. 700 Zhang R.Y...Krasnopresnenskaya kimberlite pipe, Yakutia.34 U-Pb zircon age for carbonatite and alkali-pikrite pipes, Orto-Yiarga...underlying the SW Sao Francisco craton margin, Brazil: clues to the origin of EMI-type enriched mantle...and associated rocks from the Alto Paranaiba, SE Brazil..........101 Kimberlite magmatism of the Ukraine...with ultramafic rocks in the Catalao-I Complex, Brazil: possible implications for mantle metasomatism |  | | Report (issue) | | physicists, and geologists connected with the above River and a small tributary from the west. The ground...from U.S.6eo!o0ibal Survey topographic maps, Meade River and Lookout Ridge quadrangles, Alaska 5 Miles Contour...1: the euhedral zircon zone, in samples from 2,950 to 2,970 feet, and the zoned zircon zone, represented...on the banks of a short tributary of the Kaolak River, a meandering northflowing stream that crosses the...the hole: the euhedral-zircon zone, from 760 to 3,200 feet, and the zoned-zircon zone from 3,260 to 6,760 |
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