👁 Image
| Souza Neto, João Adauto, Legrand, Jean Michel, Volfinger, Marcel, Pascal, Marie-Lola, Sonnet, Philippe (2008) W–Au skarns in the Neo-Proterozoic Seridó Mobile Belt, Borborema Province in northeastern Brazil: an overview with emphasis on the Bonfim deposit. Mineralium Deposita, 43 (2) 185-205 doi:10.1007/s00126-007-0155-1 | Journal (article/letter/editorial) | | Borborema Province in northeastern Brazil: an overview
with emphasis on the Bonfim deposit
João Adauto Souza Neto...located in the
Borborema Province in northeastern Brazil and consists of
a gneiss basement (Archean to Paleo-Proterozoic)...locally gold. Recently, the discovery of gold
in the Bonfim tungsten skarn has resulted in a better
understanding...Recife, Brazil
e-mail: adauto@ufpe.br
J. M. Legrand
Departamento de Geologia,
Universidade Federal do Rio...Rio Grande do Norte,
Campus Universitário,
Lagoa Nova,
CEP 59.072-970 Natal, Brazil
M. Volfinger : M.-L | 👁 Image
| | Journal (article/letter/editorial) | | ore fluids in the Bonfim and Itajubatiba gold skarn deposits, Northeastern Brazil: a PIXE method study...Legrand Federal University of Rio Grande do Norte State, 59.072-970, Natal, Brazil CRSCM - CNRS, 45.071, Orl6ans...skarn deposits, in Northeastern Brazil: Itajubatiba (Au) and Bonfim (W-Au). The principal objective is...trans-formed the marble and alkaline rocks into talc-silicate rocks in several places. The calc-silicate...rocks. The Bonfim W-Au deposit is situated 27 km southeast of the town of Lajes in the state of Rio Grande | 👁 Image
| | Journal (article/letter/editorial) | | mineralization at the Bonfim polymetallic skarn deposit, Seridó Mobile Belt,
Borborema Province, Brazil
Nayara Moreira...mineralization at the Bonfim polymetallic skarn deposit, Seridó Mobile
Belt, Borborema Province, Brazil, Ore Geology...mineralization at the Bonfim polymetallic skarn deposit, Seridó Mobile Belt, Borborema
Province, Brazil
Nayara Moreira... da Arquitetura, s/n,
50740-550, Recife (PE), Brazil
Corresponding author:
Nayara Moreira de Mesquista...skarns in the Borborema Province,
northeastern Brazil. The Bonfim W-Mo-Au-Bi-Te skarn occurs within a Neoproterozoic | 👁 Image
| | Journal (issue) | | INSTITUTE OF AMERICA
Emeralds from Northeastern Brazil
Diamantine: Coated Cubic Zirconia
Precision Measurement...3
Emeralds from the Fazenda Bonfim Region, Rio Grande do Norte, Brazil
J. C. (Hanco) Zwaan, Dorrit E...Polished emeralds from this deposit in northeastern Brazil, discovered in 2006, typically
display a saturated...from Pakistan • Cat’s-eye emerald from Belmont,
Brazil • Meteorite watches • Purple common opal from Mexico...of the publisher.
About the Cover
For decades, Brazil has been one of the world’s major sources of fine | 👁 Image
| | Book | | AV. PRESIDENTE WILSON, 231 - RIO DE JANEIRO
MINES AND MINERALS IN BRAZIL
--=
··--·
··-
·-·=-
MINES... MINES
AND
MINERALS
IN
BRAZIL
J OSIAS LEAO
(ECONOMIC DIVISION - MINISTRY
OF FOREIGN AFFAIRS)
CENTRO DE...DE ESTUDOS ECONOMICOS
RIO DE JANEIRO
PREFACE
This book was planned by Dr. Arno Kondei· - head of the...regarding water power and industry of
electr·icity in Brazil were specially prepared at the Division of Waters............................................
169
Talc and Soapstone ................................. | 👁 Image
| | Journal (article/letter/editorial) | | adjacent
areas, northern São Francisco Craton, Brazil, based on structural geology and
gravimetric modeling...adjacent areas, northern São Francisco Craton, Brazil, based on
structural geology and gravimetric modeling...adjacent
areas, northern São Francisco Craton, Brazil, based on structural geology and
gravimetric modeling...Ulysses Guimarães, 2862, 41213-000 Salvador, BA, Brazil
2. Programa de Pós-Graduação em Geologia, Universidade...Brasília, DF, Brazil
3. Programa de Pós-Graduação em Geologia, Universidade do Vale do Rio dos
Sinos, Avenida | 👁 Image
| | Journal (article/letter/editorial) | | deposits in the Archean Rio das Velhas greenstone belt,
Quadrilátero Ferrífero, Brazil
D.S. Vial a,⁎, G.C...c
a
CVRD—Companhia Vale do Rio Doce, BR 381, km 450, Santa Luzia, MG, Brazil
Instituto de Geociências...Amparo à Pesquisa do Estado de São Paulo,
Rua Major Solbiat, 226, Torrinha, SP, Brazil
c
Fundação Educacional...BR-116, Km 526, Bairro das Graças, Caratinga, MG, Brazil
b
Received 26 June 2003; accepted 2 January 2005...occurrences in the
Archean greenstone belt comprising the Rio das Velhas Supergroup. There are numerous small gold | 👁 Image
| | Report (issue) | | the
Companhia de Pesquisa de Recursos Minerals of Brazil
UNITED
STATES
GOVERNMENT
PRINTING OFFICE, WASHINGTON...1. Geology—Brazil—Goias (State) 2. Geology, Stratigraphic—Pre-Cambrian. 3. Geology—Brazil—Quadilatero...the
Companhia de Pesquisa de Recursos Minerals of Brazil
Precambrian oceanic rocks, including ophiolitic...carbonate rock of 900-1,300-m.y.
(million year) age (Brazil Dept. Nac. Produgao Min
eral, 1971). The Araxa...character and is considered
to be 620-900 m.y. old (Brazil Dept. Nac. Produ | 👁 Image
| | Journal (article/letter/editorial) | | protocontinent
in the south São Francisco craton, Brazil
Mariana Brando Soares, Atlas Vasconcelos Corrêa...protocontinent in the south São Francisco craton, Brazil, Gondwana
Research(2019), https://doi.org/10.1016/j...protocontinent in the south São Francisco craton, Brazil
Mariana Brando Soares1, Atlas Vasconcelos Corrêa...de Geociências, Universidade Federal do Rio de Janeiro, Brazil.
2 - Departamento de Geologia, Instituto...Geociências, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
3 - Programa de Pós-Graduação | 👁 Image
| | Journal (article/letter/editorial) | | information for emeralds examined in this study.
Region
Brazil
Madagascar
Madagascar
South Africa
Zambia
...L2017.27.5
Bonfim farm, Caiçara
do Rio do Vento,
Borborema mineral
province, Rio Grande
do Norte
Pegmatitic...bodies hosted by
amphibolites in a succession of talc,
talc-amphibole, and biotite ±
amphibole schists and...2017-14.1, 2017-14.2,
2017-14.3
Ankadilalana emerald
mine, Ambalahosy
Nord Commune,
Mananjary District,
Vatovavy...occasionally pillowed) between
migmatitic gneiss, talc-schist and
lenses of chromite-bearing
serpentinites | 👁 Image
| | Journal (article/letter/editorial) | | evolution of the Quadrilfitero Ferrifero, Minas
Gerais, Brazil
Farid Chemale Jr.a, Carlos A. RosiCreb and Issamu...Geologia, Universidadedo Vale do Rio dos Sines, 93023-000 Sa’oLeopoldo, RS, Brazil
bCentro de Pesquisas M....Horizonte, MC,
Brazil
‘Departamento de Geologia, UniversidadeFederal de Ouro Preto. Morro do Cruzeiro, 35400-000...35400-000 Ouro Preto, MG, Brazil
Received February 3, 1992; revised version accepted March 24, 1993
ABSTRACT...nucleation of regional synclines in the overlying Rio das Velbas
and Minas supergroups strata. Such regional | 👁 Image
| Giuliani, Gaston, Groat, Lee A., Marshall, Dan, Fallick, Anthony E., Branquet, Yannick (2019) Emerald Deposits: A Review and Enhanced Classification. Minerals, 9 (2) 105 doi:10.3390/min9020105 | Journal (article/letter/editorial) | | sub-types hosted in: (IA) Mafic-ultramafic rocks (Brazil, Zambia,
Russia, and others); (IB) Sedimentary...sub-types hosted in: (IIA)
Mafic-ultramafic rocks (Brazil, Austria); (IIB) Sedimentary rocks-black shale...ct. Insufu rough emerald extracted from the Kagem mine
in 2015. Lastly, on the 2th of October, the remarkable...(“the lion elephant”)
was extracted from the same mine [3]. Other giant crystals have been discovered in...emerald crystals was discovered in the Carnaíba mine, Brazil; the specimen
weighed 341 kg with 1.7 million | 👁 Image
| | Journal (article/letter/editorial) | | ARCHAEAN TERRANES
A REVIEW
107
OF CENTRAL EASTERN BRAZIL:
A. BERNASCONI*
BP Minerals International Llmzted...1983. The Archaean terranes of central eastern Brazil: a review Precambrian Res., 23" 107--131.
This...domains appear to be present in
central eastern Brazil, i.e., the S~o Francisco Craton and the Jequi~...Ltda., Rua Martins Ferreira, 75, Botafogo, Rio de
Janeiro, Brazil.
0301-9268/83/$03.00
© 1983 Elsevier...Publishers B.V
108
GREENSTONE
LITHOS~RATIGRAPHIC
l - rio H,pICUNU
Z RliCRO DOs MACHA~ 5
] GOUVEI/I
PlUll
| 👁 Image
| Lord, R. A., Prichard, H. M., S.SA, J. H., Neary, C. R. (2004) Chromite Geochemistry and PGE Fractionation in the Campo Formoso Complex and Ipueira-Medrado Sill, Bahia State, Brazil. Economic Geology, 99 (2) 339-363 doi:10.2113/gsecongeo.99.2.339 | Journal (article/letter/editorial) | | Complex and Ipueira-Medrado Sill, Bahia State, Brazil
R. A. LORD,†
Clean Environment Management Centre...Geociências, Universidade Federal da Bahia, Salvador, Brazil
AND C. R. NEARY
Formerly at Natural Environment...orthopyroxene relicts in an upper unit at the Cascabulhos mine.
Microprobe studies of chromite-rich specimens from...11:35 AM Page 340
340
LORD ET AL.
Introduction
BRAZIL has ranked seventh in terms of world chromite production...contain the
largest known reserves of chromite in Brazil, with potential
reserves totaling 52 and 30 million | 👁 Image
| | Journal (article/letter/editorial) | | com/loi/tigr20
Geology and Mineral Resources of Brazil: A
Review
a
a
Inacio De Medeiros Delgado , Augusto...Pesquisa de Recursos Minerals, Scdvador, Bahia, Brazil
b
US. Geological Survey, Denver, CO, 80225
Version...Thorman (1994):
Geology and Mineral Resources of Brazil: A Review, International Geology Review, 36:6,...rights reserved.
Geology and Mineral Resources of Brazil: A Review
INACIO DE MEDEIROS DELGADO, AUGUSTO J...Pesquisa de Recursos Minerals, Scdvador, Bahia, Brazil
AND CHARLES H. THORMAN
US. Geological Survey, Denver | 👁 Image
| | Report (issue) | | Rocks
of the Quadrilatero Ferrifero,
Minas Gerais, Brazil
GEOLOGICAL
SURVEY PROFESSIONAL PAPER 641-B
Prepared...the Departmento
Nacional da Producao Mineral of Brazil
under the auspices oj the
Agency for International...Gerais, Brazil
By NORMAN HERZ
REGIONAL GEOLOGY OF THE QUADRILATERO FERRlFERO,
MINAS GERAIS, BRAZIL
GEOLOGICAL...the Departmento
Nacional da Producao Mineral of Brazil
under the auspices of the
Agency for International...map of the Quadrildtero Ferrffero, Minas Gerais, Brazil showing areas of gneissic and igneous
rocks___ | 👁 Image
| | Journal (article/letter/editorial) | | of strongly deformed pegmatoid
bodies in biotite, talc and actinolite schists. While the surrounding Murchison...the octahedral and
tetrahedral substitution, and do not substitute for Be or
Al (Auriscchio et al., 1988)...of emerald occur in
Colombia, Zambia, Pakistan, Brazil, Russia, Afghanistan,
Zimbabwe and Madagascar....Leydsdorp emeralds occur in a sequence of biotite,
talc, chlorite and actinolite schists tectonically intercalated...phenakite-bearing pegmatite, and albite
pegmatite, with biotite, talc and actinolite schists (Grundmann
and Morteani, | 👁 Image
| | Journal (article/letter/editorial) | | The Kamakanga deposit is hosted by
of the local mine. The majority of the studied samples appeared as...Metabasite,
Quartzite,
Quartz
mica
schist.
metabasite
talc
of
the
studied
samples
was
highly
variable,
being...samples were obtained from the owner
of the local mine. The majority of the studied samples appeared as...calcite, schorl
Inclusions described by other authors: talc, barite, albite, actinolite,
chlorite, quartz, fluorite...012
Refractive
related
Fazenda
Country
Deposits Brazil
1.578–1.583
1.587–1.591
0.008–0.009
NeBonfim
No | 👁 Image
| | Journal (article/letter/editorial) | | margin of the São Francisco paleocontinent (SE Brazil):
Constraints from metamafic–ultramafic rocks
Marco...Geological Survey of Brazil – CPRM, Av Brazil 1731, Belo Horizonte 30140-002, Brazil
Department of Mineral...The Campos Gerais Domain (CGD) in southeastern Brazil is an approximately 180 km 35 km area of
Archean–Proterozoic...margin
of the São Francisco paleocontinent (SE Brazil): Constraints from metamafic–ultramafic rocks,...Ga.
The Campos Gerais Domain (CGD) in southeast Brazil is a
180 km 35 km area of Archean–Proterozoic | 👁 Image
| | Journal (issue) | | Decade of Change
A New Era for the Historic Coscuez Mine
Esmeraldas Santa Rosa: Our Wealth is Green
Rediscovery...More
Exquisite Emeralds
Magnificent Old Mine Emeralds
143
Mine Visit
A Visit to Colombia’s “Green” Emerald...Origins and Appellation
President
Clement Sabbagh, Brazil
Vice Presidents
Damien Cody, Australia
Nirmal Kumar...Kumar Bardiya, India
Treasurer
Marcelo Ribeiro, Brazil
Secretaries
Bruce Bridges, USA
Santpal Sinchawla...acquiring the majority stake in
the iconic Coscuez mine in Colombia.
The 2015 Symposium focused on the government’s | 👁 Image
| | Journal (article/letter/editorial) | | emeralds typically included phlogopite, quartz, talc, aragonite, and albite. The representative UV-Vis-NIR...archaeologists, historians, and others [1]. Colombia, Brazil, and Zambia remain at the top of the list of major...of high-quality production are the deposits of Brazil, Russia, and Zambia, but smaller deposits with...biotite and muscovite schists with minor feldspar, talc schists, and vermiculite schists, associated with...inclusions: platelets2.73–2.75 of phlogopite; quartz; talc, aragonite, and albite; c • Short columnar black | 👁 Image
| Hensler, Ana-Sophie, Hagemann, Steffen G., Brown, Philip E., Rosière, Carlos A. (2014) Using oxygen isotope chemistry to track hydrothermal processes and fluid sources in itabirite-hosted iron ore deposits in the Quadrilátero Ferrífero, Minas Gerais, Brazil. Mineralium Deposita, 49 (3) 293-311 doi:10.1007/s00126-013-0486-z | Journal (article/letter/editorial) | | deposits
in the Quadrilátero Ferrífero, Minas Gerais, Brazil
Ana-Sophie Hensler & Steffen G. Hagemann &
Philip...Heidelberg 2013
Abstract The Quadrilátero Ferrífero, Brazil, is presently the
largest accumulation of single...Gerais,
Belo Horizonte, Minas Gerais 31270-901, Brazil
and/or the infiltration of small volumes of isotopically...jaspilite-hosted iron ore of Carajás in the north of Brazil,
the ore bodies of the Transvaal in South Africa...terranes and the greenstone belt sequence of the Rio das
Velhas Supergroup, which are unconformably overlain | 👁 Image
| | Book | | BARTORELLI
::• . . ..
MINERALS
& PRECIOUS
STONES
OF BRAZIL
Sponsored by:
VALE
MINISTER.IO
DA CULTURA
©...Crystal of multicolored tourmaline
(84 x 26 mm), Lavra do Sapo,
Ferruginha, Conselheiro Pena,
Minas Gerais...Publication Data (CIP)
(Camara Brasileira do Livro, SP, Brazil)
Aquamarine (113 mm high), Medina,
Minas...Cornejo, Carlos
.Minerals & precious stones of Brazil.
Carlos Cornejo, Andrea Bartorelli.
[franslation:...pedras preciosas do Brasil
Amethyst flower (85 x 60 mm),
Ametista do Sul, Rio Grande do
Sul. Collection | 👁 Image
| | Report (issue) | | the Departmento
National da Produ^ao Mineral of Brazil
under the auspices of the
Agency for International...Gerais, Brazil
By NORMAN HERZ
REGIONAL GEOLOGY OF THE QUADRILATERO FERRIFERO,
MINAS GERAIS, BRAZIL
GEOLOGICAL...the Departmento
Nacional da Produqao Mineral of Brazil
under the auspices of the
Agency for International...Minas Gerais, Brazil.
(Regional geology of the Quadrilatero Ferrifero, Minas Gerais, Brazil) (Geological...Petrology Brazil Quadrilatero do Ferro. 3. Geology, Stratigraphic Pre-Cambrian.
I. Brazil. Departamento | 👁 Image
| | Journal (article/letter/editorial) | | State, Brazil
JULIANA CHARÃO MARQUES†
Instituto de Geociências, Universidade Federal do Rio Grande do Sul-UFRGS...Campus do Vale, Av. Bento Gonçalves 9500,
Caixa Postal 15001, CEP 91501-970, Porto Alegre-RS, Brazil
AND...Brasília-UnB, Campus Universitário, Asa Norte, Brasília-DF, CEP 70910-900, Brazil
Abstract
The Ipueira-Medrado...mafic-ultramafic sill hosts the largest chromite deposit in Brazil. The sill is a 7-kmlong and 300-m-thick elongated...representing the largest concentration of chromite in Brazil
(Marinho et al., 1986).
The ore in the Ipueira-Medrado |
|
