 | | Report (issue) | | the Departmento National da Produ^ao Mineral of Brazil under the auspices of the Agency for International...Ferrifero, Minas Gerais, Brazil By NORMAN HERZ REGIONAL GEOLOGY OF THE QUADRILATERO FERRIFERO, MINAS GERAIS...GERAIS, BRAZIL GEOLOGICAL SURVEY PROFESSIONAL Prepared in cooperation with the Departmento Nacional da Produqao...Produqao Mineral of Brazil under the auspices of the Agency for International Development of the United...Ferrifero, Minas Gerais, Brazil. (Regional geology of the Quadrilatero Ferrifero, Minas Gerais, Brazil) (Geological |  | | Journal (article/letter/editorial) | | PRECAMBRIAN IN THE SOUTHERN SERRA DO ESPINHA~O, MINAS GERAIS, BRAZIL A. HOPPE Geologisch-Paliiontologisches...Precambrian in the southern Serra do Espinha~o, Minas Gerais, Brazil. PrecambrianRes, 13: 275--296. Middle Precambrian...tectonics and metamorphism. An Archaean basement (Pre-Minas Supergroup) consists of an older granitic unit and...starts north of the Quadril~tero Ferrffero of Minas Gerais and extends N--S for 1200 km as far as Bahia...Pflug and Renger, 1973): (c) post-Minas, (b) Minas, (a) pre-Minas. Following the recommendations of the |  | | Report (issue) | | a = 12.283 Z=8 X-ray Powder Pattern: Itabira district, Brazil. 2.167 (100), 2.356 (90), 1.533 (70),...57 9.58 Total 99.01 100.43 100.00 (1) Itabira district, Brazil; by electron microprobe, corresponding...Precambrian iron-precious metal deposits (Itabira district, Brazil). Association: Arsenopalladinite, atheneite...atheneite, palladseite, hematite, gold (Itabira district, Brazil); chalcopyrite, millerite, kotulskite,...polydymite, diopside, actinolite, epidote (âYenâ district, China). Distribution: In Brazil, in gold placers |  | | Journal (article/letter/editorial) | | FERRĂFERO, BRAZIL CARLOS ALBERTO ROSIĂREâ Instituto de GeociĂȘncias, Universidade Federal de Minas Gerais, 31270-901...31270-901 Belo Horizonte MG, Brazil AND FRANCISCO JAVIER RIOS Fluid Inclusion and Metallogenic Laboratory...(CDTN-CNEN), Cx. Postal 941, 30123-970 Belo Horizonte MG, Brazil Abstract Petrographic and textural analysis combined...northeastern part of the QuadrilĂĄtero FerrĂfero, Brazil, indicate a complex process of oxidation and mineralization...QuadrilĂĄtero FerrĂfero district, Minas Gerais, southeastern Brazil, are host to metamorphosed iron formations |  | | Journal (article/letter/editorial) | | hematite ore at the QuadrilĂĄtero FerrĂfero, Minas Gerais, Brazil and its possible genetic significance F...are hosted by the Proterozoic itabirites of the Itabira iron formation. These deposits are widely distributed...deposits of high-grade, compact hematite of QF, Minas Gerais, Brazil, averaging 68%Fe and < 1%SiO2, totalling...Janeiro), Ilha do FundĂŁo, Rio de Janeiro RJ 21949-900, Brazil (frpires@geologia.ufrj.br). Based on a contribution...hematite ore at the QuadrilĂĄtero FerrĂfero, Minas Gerais, Brazil and its possible genetic significance 1 |  | de Souza, J. L., Mendes, J. C., da Silveira Bello, R. M., Svisero, D. P., Valarelli, J. V. (1992) Petrographic and microthermometrical studies of emeralds in the âGarimpoâ of Capoeirana, Nova Era, Minas Gerais State, Brazil. Mineralium Deposita, 27 (2) 161-168 doi:10.1007/bf00197103 | Journal (article/letter/editorial) | | the 'Garimpo' of Capoeirana, Nova Era, Minas Gerais State, Brazil J.L. de Sonza ~, J. C. Mendes 1, S...Preto, Ouro Preto, Minas Gerais, Brazil 2 IG, Universidade de S~o Paulo, S~o Paulo, Brazil Received: November...the area of the Capoeirana emerald deposit, Minas Gerais State, revealed two main lithostructural units...the extent of a emeraldiferrous province in Minas Gerais State, which begins at northern Rio Casca and...terms - are represented by the mineral deposit of Itabira, discovered in 1978 S _ . . ~.~C/L~ -~4~ I~ |  | | Journal (article/letter/editorial) | | high-strain domain of the QuadrilaÌtero FerrıÌfero, Brazil, hard and soft high-grade hematite ore may occur...thrusting the Paleoproterozoic platform sequence of the Minas Supergroup over Mesoproterozoic quartzites of the...synclines, with Paleoproterozoic metasediments of the Minas Supergroup separated by antiformal structures and...crystalline rocks. The Minas Supergroup comprise, from bottom to top, Caraça, Itabira, Piracicaba and SabaraÌ... Universidade Federal de Minas Gerais, Belo Horizonte MG 31270-901, Brazil Fluid Inclusion and Metallogeny |  | | Report (issue) | | average of analyses on four grains. (2) Itabira district, Brazil; by electron microprobe. (3) PtCu. Occurrence:...by platinum from which copper has been leached (Brazil); in Alpine-type ultramafic intrusives and related...isomertieite, magnetite, bornite, polydymite, diopside, actinolite, epidote (China); sperrylite, isomertieite, atheneite...palladian gold, platinum, platinian tetra-auricupride (Brazil) Distribution: In China [originally described from...CaueÌ and ConceiçaÌo iron mines, Itabira district, Minas Gerais, Brazil. Name: For its occurrence near |  | Chaves, Alexandre de Oliveira, Ernst, Richard E., Söderlund, Ulf, Wang, Xinping, Naeraa, Tomas (2019) The 920â900âŻMa Bahia-Gangila LIP of the SĂŁo Francisco and Congo cratons and link with Dashigou-Chulan LIP of North China craton: New insights from U-Pb geochronology and geochemistry. Precambrian Research, 329. 124-137 doi:10.1016/j.precamres.2018.08.023 | Journal (article/letter/editorial) | | of Geosciences â Federal University of Minas Gerais - Brazil. alochaves@yahoo.com.br 2 â Department of...analyses on baddeleyite grains) on the Santa Maria de Itabira gabbroic intrusion. These ages suggest membership...Francisco (SF) and Congo cratons, spanning eastern Brazil and formerly adjacent central Africa. The SF/Congo...Paleomagnetic data from coastal Bahia mafic dykes in Brazil places the SF/Congo craton in moderate to high...Rifting at 920 Ma is recognized for the AraçuaĂ (Brazil) and West Congo (Africa) regions (Trompette, 1994 |  | | Report (issue) | | Geology and Ore Deposits of the Itabira District Minas Gerais, Brazil GEOLOGICAL SURVEY PROFESSIONAL... Geology and Ore Deposits of the Itabira District Minas Gerais, Brazil By JOHN VAN N. DORR 20 and ALUIZIO...GEOLOGY AND MINERAL RESOURCES OF PARTS OF MINAS GERAIS, BRAZIL GEOLOGICAL SURVEY PROFESSIONAL PAPER 341-C...the Departamento Nacional da Producao Mineral of Brazil under the auspices of the International Cooperation...rocks_____________________________ Geology of the Itabira district__-___-_________________ Stratigraphy. |  | | Report (issue) | | Campo Dom Bosco, and Ouro Branco Quadrangles Minas Gerais, Brazil GEOLOGICAL SURVEY PROFESSIONAL PAPER 341-B...the Departamento Nacional da Producao Mineral of Brazil under the auspices of the International Cooperation...Quadrangles Minas Gerais, Brazil By ROBERT F. JOHNSON GEOLOGY AND MINERAL RESOURCES OF PARTS OF MINAS GERAIS...GERAIS, BRAZIL GEOLOGICAL SURVEY PROFESSIONAL PAPER 341-B Prepared in cooperation with the Departamento...Departamento National da Producao Mineral of Brazil under the auspices of the International Cooperation Administration |  | LĂŒders, Volker, Romer, Rolf L., Cabral, Alexandre R., Schmidt, Christian, Banks, David A., Schneider, Jens (2005) Genesis of itabirite-hosted AuâPdâPt-bearing hematite-(quartz) veins, QuadrilĂĄtero FerrĂfero, Minas Gerais, Brazil: constraints from fluid inclusion infrared microthermometry, bulk crush-leach analysis and UâPb systematics. Mineralium Deposita, 40 (3) 289-306 doi:10.1007/s00126-005-0024-8 | Journal (article/letter/editorial) | | hematite-(quartz) veins, QuadrilaÌtero FerrıÌfero, Minas Gerais, Brazil: constraints from fluid inclusion infrared...formation (itabirite) of the Paleoproterozoic Itabira Group. The sample suite comprises hematite from...microscopy Ă UâPb Ă Jacutinga veins Ă AuâPdâPt Ă Minas Gerais Introduction Present address: A. R. Cabral...occurrences of economic importance seem to be known from Brazil 290 only. During the Brazilian Gold Cycle (1695â1785)...from the area around the city of Ouro Preto (Minas Gerais) presumably came from palladian gold mineralization |  | | Journal (article/letter/editorial) | | FaÌbrica deposit, QuadrilaÌtero FerrıÌfero, Minas Gerais, Brazil A. R. Cabral*1 and A. V. CorreÌa Neto2 Manganese...FaÌbrica in the QuadrilaÌtero FerrıÌfero of Minas Gerais in Brazil. The veinlets are microbreccias of cryptomelane...Mechanically twinned haematite, FaÌbrica deposit, Minas Gerais, Brazil Introduction Manganese in high grade haematite...haematite ore of the QuadrilaÌtero FerrıÌfero of Minas Gerais commonly does not exceed 0.1 wt-%.1â3 Where...compact haematite from the FaÌbrica deposit in Brazil. FaÌbrica belongs to a mining complex which produced |  | Lynch, E. P., Costanzo, A., Feely, M., Blamey, N. J. F., Pironon, J., Lavin, P. (2014) The Piteiras emerald mine, Minas Gerais, Brazil: fluid-inclusion and gemmological perspectives. Mineralogical Magazine, 78 (7) 1571-1587 doi:10.1180/minmag.2014.078.7.04 | Journal (article/letter/editorial) | | pp. 1571â1587 The Piteiras emerald mine, Minas Gerais, Brazil: fluid-inclusion and gemmological perspectives...faceted emeralds from the Piteiras Mine, Minas Gerais, Brazil. These data complement those of Rondeau... schist-hosted emeralds. K EY WORDS : Emerald, Brazil, gemmology, ïŹuid inclusions, microthermometry,...~10 20% of world emerald production, which ranks Brazil second after Colombia (Schwarz and Giuliani, 2002;...emeralds in Brazil was made in 1912 in GoiaÌs (Just, 1926). In 1920, the ïŹrst discovery in Minas Gerais was made |  | | Journal (issue) | | Pearl Testing 36 Emeralds from South America â Brazil and Colombia 48 Clinohumite â The Mountain Fire...rise of new economies such as China, India, and Brazil. The challenges have been numerous as these new...every ICA member, I would like to thank the IBGM in Brazil along with every company, individual, and government... G E M O LO G Y Emeralds from South America â Brazil and Colombia By Dr. Dietmar Schwarz, research manager...gemology, Federal University of Ouro Preto, Minas Gerais (UFOP); and Dr. Leo Klemm, analyst, GĂŒbelin |  | Lobato, Lydia Maria, Ribeiro-Rodrigues, Luiz ClĂĄudio, Zucchetti, MĂĄrcia, Noce, Carlos MaurĂcio, Baltazar, Orivaldo Ferreira, da Silva, Luiz Carlos, Pinto, Claiton Piva (2001) Brazil's premier gold province. Part I: The tectonic, magmatic, and structural setting of the Archean Rio das Velhas greenstone belt, QuadrilĂĄtero FerrĂfero. Mineralium Deposita, 36 (3) 228-248 doi:10.1007/s001260100179 | Journal (article/letter/editorial) | | signiÂźcant Archean greenstone-belt successions in Brazil, in both their appreciable mineral productivity...fero (Iron Quadrangle) region, Minas Gerais state, southeastern Brazil, which occupies the southernmost...Federal de Minas Gerais, Av. AntoĂnio Carlos 6627, Pampulha, Belo Horizonte, Minas Gerais 31270-901,... Brazil E-mail: lobato@dedalus.lcc.ufmg.br Fax: +55-31-4995410 L.C. Ribeiro-Rodrigues FAPEMIG Bursary...Escola de Minas, Universidade Federal de Ouro Preto, Morro do Cruzeiro, Ouro Preto, Minas Gerais 35400-000 |  | Olivo, Gema Ribeiro, Gauthier, Michel, Bardoux, Marc, Leao de Sa, Euripedes, Fonseca, Jose Teotonio F., Santana, Fernando Carbonari (1995) Palladium-bearing gold deposit hosted by Proterozoic lake superior-type iron-formation at the Caue iron mine, Itabira District, southern Sao Francisco Craton, Brazil; geologic and structural controls. Economic Geology, 90 (1) 118-134 doi:10.2113/gsecongeo.90.1.118 | Journal (article/letter/editorial) | | at the Cau Iron Mine, Itabira District, Southern SaoFrancisco Craton,Brazil: GeologicandStructuralControls...Dote, Itabira, MinasGerais,Brazil 35900-900 Abstract The Cauâą iron mine is located in the Itabira district...conglomerates cludingthe QuadrilfiteroFerrlfero and the Itabira dis- Gandarelaprospect),graphitic phyllites (Passagemde... IRON-FORMATION-HOSTED Pd-AuDEPOSIT,CAUJâą MINE,BRAZIL 119 the highest grades are aligned parallel to...t hoststhe gold ----'] ARCHEANESPINHAâą,O S.G. MINAS S.G RIO DAS VELHAS SG PROTEROZOIC GRANITE-GNEISS |  | Cabral, A. R., Lehmann, B., Kwitko, R., Costa, C. H. C. (2002) The Serra Pelada Au-Pd-Pt deposit, Carajas mineral province, northern Brazil: reconnaissance mineralogy and chemistry of very high grade palladian gold mineralization. Economic Geology, 97 (5) 1127-1138 doi:10.2113/gsecongeo.97.5.1127 | Journal (article/letter/editorial) | | Au-Pd-Pt DEPOSIT, CARAJĂS MINERAL PROVINCE, NORTHERN BRAZIL: RECONNAISSANCE MINERALOGY AND CHEMISTRY OF VERY...296, Caixa Postal 09, 33030-970 Santa Luzia-MG, Brazil AND C.H. CRAVO COSTA Companhia Vale do Rio DoceâCVRD...51, Serra dos CarajĂĄs, 68516-000 Parauabepas-PA, Brazil Abstract A historic drill core from the Serra...palladseite and sudovikovite from the type localities of Itabira (Davis et al., 1977) and Karelia (Polekhovskii...calcite (1â15 vol %) with variable amounts of actinolite (5â50 vol %), chlorite (1â20 vol %), biotite |  | | Journal (article/letter/editorial) | | Pico Iron Mines, QuadrilaÌtero FerrıÌfero, Minas Gerais, Brazil Received: 30 July 2002 / Accepted: 15 May...of the Minas Supergroup located in the QuadrilaÌtero FerrıÌfero district, Minas Gerais, Brazil. The AÌguas...Reunidas-MBR, Av. de LigaçaÌo 3580, 34000-000 Nova Lima, Brazil E-mail: cbs@mbr.com.br Tel.: +55-31-32893825 Fax:...SaÌo Paulo, Rua do Lago 562, 05508-900 SaÌo Paulo, Brazil C. A. RosieÌre Instituto de GeocieÌncias, Campus...Pampulha, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, Brazil Introduction The QuadrilaÌtero |  | | Report (issue) | | Igneous Rocks of the Quadrilatero Ferrifero, Minas Gerais, Brazil GEOLOGICAL SURVEY PROFESSIONAL PAPER 641-B...the Departmento Nacional da Producao Mineral of Brazil under the auspices oj the Agency for International...Ferrifero, Minas Gerais, Brazil By NORMAN HERZ REGIONAL GEOLOGY OF THE QUADRILATERO FERRlFERO, MINAS GERAIS...GERAIS, BRAZIL GEOLOGICAL SURVEY PROFESSIONAL PAPER 641-B Prepared in cooperation with the Departmento...Departmento Nacional da Producao Mineral of Brazil under the auspices of the Agency for International Development |  | | Journal (article/letter/editorial) | | during the gold-lode formation of Passagem, Minas Gerais, Brazil Alexandre Raphael Cabral a,â, Armin Zeh...dating Gold-lode deposit Passagem de Mariana Minas Gerais a b s t r a c t Zircon and xenotime occur in...deposit (i.e., jacutinga lode) in the region (Itabira), another important mineralisation style of gold...Mariana, QuadrilĂĄtero FerrĂfero (QF) of Minas Gerais, Brazil. Passagem represents a historically important...locality of carvoeira-style mineralisation in Minas Gerais. Two different timings for the carvoeira-style |  | Hensler, Ana-Sophie, Hagemann, Steffen G., Brown, Philip E., RosiĂšre, Carlos A. (2014) Using oxygen isotope chemistry to track hydrothermal processes and fluid sources in itabirite-hosted iron ore deposits in the QuadrilĂĄtero FerrĂfero, Minas Gerais, Brazil. Mineralium Deposita, 49 (3) 293-311 doi:10.1007/s00126-013-0486-z | Journal (article/letter/editorial) | | deposits in the QuadrilĂĄtero FerrĂfero, Minas Gerais, Brazil Ana-Sophie Hensler & Steffen G. Hagemann...Heidelberg 2013 Abstract The QuadrilĂĄtero FerrĂfero, Brazil, is presently the largest accumulation of single...Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais 31270-901, Brazil and/or the infiltration...jaspilite-hosted iron ore of CarajĂĄs in the north of Brazil, the ore bodies of the Transvaal in South Africa...unconformably overlain by the metasedimentary rocks of the Minas Supergroup (MSG) (Fig. 1) (Dorr 1969). The MSG was |  | | Report (issue) | | Monlevade and Rio Piracicaba Quadrangles, Minas Gerais Brazil GEOLOGICAL SURVEY PROFESSIONAL PAPER 341-E...the Departamento Nacional da Producao Mineral of Brazil under the auspices of the Agency for International...Quadrangles, Minas Gerais Brazil By ROBERT G. REEVES GEOLOGY AND MINERAL RESOURCES OF PARTS OF MINAS GERAIS, BRAZIL...the Departamento Nacional da Producao Mineral of Brazil under the auspices of the Agency for International...____________ Itabirite. - _______________________ Minas Series_-_--_____--_______--___-__-_ Caraga Grou |  | | Report (issue) | | and Ore Deposits of the Alegria District, Minas Gerais, Brazil GEOLOGICAL SURVEY PROFESSIONAL PAPER 341-J...the Departamento National da Producao Mineral of Brazil under the auspices of the Agency for International...District, Minas Gerais, Brazil By CHARLES H. MAXWELL GEOLOGY AND MINERAL RESOURCES OF PARTS OF MINAS GERAIS...GERAIS, BRAZIL GEOLOGICAL SURVEY PROFESSIONAL PAPER 341-J Prepared in cooperation with the Departamento...Departamento National da Producao Mineral of Brazil under the auspices of the Agency for International Development |  | Barkov, A. Y., Fleet, M. E., Martin, R. F., Halkoaho, T. A.A. (2005) New data on "Bonanza"-type PGE mineralization in the Kirakkajuppura PGE deposit, Penikat layered complex, Finland. The Canadian Mineralogist, 43 (5) 1663-1686 doi:10.2113/gscanmin.43.5.1663 | Journal (article/letter/editorial) | | Finland. The PGM are intimately associated with actinolite and clinochlore. The base-metal sulfides [chalcopyrite... This pyroxenite now consists principally of actinolite (about 70 modal %) and varying amounts of clinochlore;...thiospinels, are enclosed within the hydrous silicates (actinolite and clinochlore). Some of the vysotskiteâ braggite...and irregular grains and aggregates enclosed by actinolite and clinochlore, (3) micro-aggregates, which...vysotskiteâbraggite, enclosed by hydrous silicates (actinolite and clinochlore). Note that these veinlet-like |
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