Carlos Alberto Rosiére

Instituto de Geociencias

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João Orestes Schneider Santos

University of Western Australia

Steffen Hagemann

University of Western Australia

Flávia Cristina Silveira Braga

Instituto de Geociencias

Lydia Maria Lobato

Universidade Federal de Minas Gerais

Rosaline Cristina Figueiredo e Silva

Universidade Federal de Minas Gerais

Beate Orberger

Geosciences Paris Sud

Vassily Khoury Rolim

Universidade Federal de Minas Gerais

Francisco Javier Ríos

Centro de Desenvolvimento da Tecnologia Nuclear

Heinrich Siemes

RWTH Aachen University

Neal J. McNaughton

Curtin University

Cooperative Institutions

Universidade Federal de Minas Gerais

Instituto de Geociencias

Centre National de la Recherche Scientifique

Universidade de São Paulo

Universidade de Brasília

University of Western Australia

Centro de Desenvolvimento da Tecnologia Nuclear

Universidade Federal de Ouro Preto

Curtin University

Université Paris-Sud

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Reply to ‘The complex tale of Mantiqueira and Juiz de Fora: A comment on “Eoarchean to Neoproterozoic crustal evolution of the Mantiqueira and the Juiz de Fora Complexes, SE Brazil: Petrology, geochemistry, zircon U-Pb geochronology and Lu-Hf isotopes”’ by K. Cutts and C. Lana

Precambrian Research (2019)

Yusuke Kuribara Toshiaki Tsunogae M. Santosh Yusuke Takamura Antônio Gilberto Costa

Medulla

10.1016/j.precamres.2019.105469

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Citations (0)

Post‐Great Oxidation Event Orosirian–Statherian iron formations on the São Francisco craton: Geotectonic implications

Island Arc (2019)

Carlos Alberto Rosiére Andrey Bekker Vassily Khoury Rolim João Orestes Schneider Santos

Abstract The protocratonic core of the São Francisco craton assembled during the 2.1–2.0 Ga Transamazonian orogeny. Orosirian Fe‐rich sequences that extend from the northwestern border of the São Francisco protocraton (Colomi Group) to the southeast under the Espinhaço Belt (the < 1.99 Ga Serra da Serpentina Group) record the opening of an intracratonic basin with the episodically developed ferruginous waters prior to the initiation of the Espinhaço rift at 1.8 Ga. Ferruginous conditions developed again during deposition of the Canjica Iron Formation of the < 1.7 Ga Serra de São José Group in the Espinhaço rift (contemporaneously with felsic magmatism; Conceição do Mato Dentro Rhyolite and Borrachudos Granitic Suite) and extensive sandstones of the < (1666 ±32) Ma Itapanhoacanga and < (1683 ±11) Ma São João da Chapada Formations. In the upper São João da Chapada Formation, banded hematitic phyllite also records input of Fe‐rich fluids. The young age of these iron formations with respect to the conventionally accepted 1.88 Ga age for the youngest shallow‐marine Paleoproterozoic iron formations, the apparent absence of granular facies (granular iron formations), and yet shallow‐water (above fair‐weather base) depositional environment indicate that an unusual setting developed in a large basin after the Great Oxidation Event, in the aftermath of the Transamazonian orogeny. We propose that mantle plumes led to the opening of a previously unrecognized rift system, that could have caused the magmatism, supplied hydrothermal Fe and led to the opening of the Espinhaço, Pirapora, and Paramirim rifts, later obliterated by the Araçuaí orogenic belt during the Neoproterozoic to Early Paleozoic Brasiliano orogeny. The rift system did not develop into an open continental margin but probably evolved into a broad sag basin, stretching across the São Francisco and Congo cratons.

Orogeny

Felsic

Diachronous

10.1111/iar.12300

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Citations (15)

THE ORIGIN OF HEMATITE IN HIGH-GRADE IRON ORES BASED ON INFRARED MICROSCOPY AND FLUID INCLUSION STUDIES: THE EXAMPLE OF THE CONCEICAO MINE, QUADRILATERO FERRIFERO, BRAZIL

Economic Geology (2004)

Carlos Alberto Rosiére Francisco Javier Ríos

Research Article| May 01, 2004 THE ORIGIN OF HEMATITE IN HIGH-GRADE IRON ORES BASED ON INFRARED MICROSCOPY AND FLUID INCLUSION STUDIES: THE EXAMPLE OF THE CONCEIÇÃO MINE, QUADRILÁTERO FERRÍFERO, BRAZIL Carlos Alberto Rosière; Carlos Alberto Rosière Instituto de Geociências, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte MG, Brazil †Corresponding author: email, crosiere@dedalus.lcc.ufmg.br Search for other works by this author on: GSW Google Scholar Francisco Javier Rios Francisco Javier Rios Fluid Inclusion and Metallogenic Laboratory (EC1), Centro de Desenvolvimento da Tecnologia Nuclear (CDTN-CNEN), Cx. Postal 941, 30123-970 Belo Horizonte MG, Brazil Search for other works by this author on: GSW Google Scholar Author and Article Information Carlos Alberto Rosière Instituto de Geociências, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte MG, Brazil Francisco Javier Rios Fluid Inclusion and Metallogenic Laboratory (EC1), Centro de Desenvolvimento da Tecnologia Nuclear (CDTN-CNEN), Cx. Postal 941, 30123-970 Belo Horizonte MG, Brazil †Corresponding author: email, crosiere@dedalus.lcc.ufmg.br Publisher: Society of Economic Geologists Received: 20 Nov 2001 Accepted: 16 Dec 2003 First Online: 02 Mar 2017 Online ISSN: 1554-0774 Print ISSN: 0361-0128 Economic Geology Economic Geology (2004) 99 (3): 611–624. https://doi.org/10.2113/gsecongeo.99.3.611 Article history Received: 20 Nov 2001 Accepted: 16 Dec 2003 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Carlos Alberto Rosière, Francisco Javier Rios; THE ORIGIN OF HEMATITE IN HIGH-GRADE IRON ORES BASED ON INFRARED MICROSCOPY AND FLUID INCLUSION STUDIES: THE EXAMPLE OF THE CONCEIÇÃO MINE, QUADRILÁTERO FERRÍFERO, BRAZIL. Economic Geology 2004;; 99 (3): 611–624. doi: https://doi.org/10.2113/gsecongeo.99.3.611 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyEconomic Geology Search Advanced Search Abstract Petrographic and textural analysis combined with fluid inclusion studies by infrared microscopy of high-grade (>65% Fe) hematite ore samples from the Conceição deposit, in the northeastern part of the Quadrilátero Ferrífero, Brazil, indicate a complex process of oxidation and mineralization during two orogenic events, each developed under different conditions and involving distinct fluids. The earliest mineralization formed massive magnetite-rich orebodies under relatively reducing conditions in the early stages of the Transamazonian orogeny. Magnetite was oxidized (martitized) with the development of porous hematite crystals (hematite I). Possibly during this stage, new hematite crystals were also formed from low-temperature, low- to medium-salinity fluids, as indicated by two-phase fluid inclusions. The origin of these fluids is still uncertain but tentatively interpreted as being modified surface water. The fluids were transported along normal faults and fractures during post-tectonic collapse following the Transamazonian orogeny (2.1–2.0 Ga) and creation of the dome-and-keel structural pattern of the Quadrilátero Ferrífero. These solutions were also likely responsible for the initial oxidation of the iron formations and the development of hematite I. Subsequent uplifted hot basement rocks or post-tectonic plutons were probable heat sources for the regional metamorphism and development of a granoblastic fabric of hematite II grains in the iron formations and high-grade orebodies. However, the ore was only partially recrystallized, as several relics of the early magnetite, martite, and hematite are still preserved in the granular hematite II crystals. During the Brasiliano-Pan-African orogeny (0.8–0.6 Ga), high-salinity fluids, with temperatures varying from ~120° to a maximum of approximately 350°C, penetrated the iron formations along shear zones, crystallizing initially tabular and thereafter platy hematite crystals (hematite III and specularite) forming schistose orebodies. Quartz veins that cut across the ore and envelop specularite plates and ore fragments formed from late-stage, high-temperature, and low-salinity fluids containing CO2. These later fluids did not alter the ore.Each of these stages of mineralization produced orebodies with distinct features. Recurrent hydrothermal mineralization is thought to have been responsible for the development of giant, high-grade iron ore deposits in structurally favorable sites. Fold hinges with enhanced permeability and deep faults able to conduct the fluids to the surface, repeatedly over time, should be important targets for exploration of new resources. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

10.2113/gsecongeo.99.3.611

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Citations (96)

The Archean BIF-hosted Lamego gold deposit, Rio das Velhas greenstone belt, Quadrilátero Ferrífero: Evidence for Cambrian structural modification of an Archean orogenic gold deposit

Ore Geology Reviews (2015)

Breno de Souza Martins Lydia Maria Lobato Carlos Alberto Rosiére Steffen Hagemann João Orestes Schneider Santos

The Lamego orogenic gold deposit (1.3 Mt measured resources at 7.26 g/t Au) is located at the south-western end of the 5 km-long Cuiabá–Lamego trend, Quadrilátero Ferrífero region, Brazil. Both Archean orogenic gold deposits are situated in the Rio das Velhas greenstone belt with the lithological succession at Lamego consisting of metamorphosed (greenschist facies) mafic volcanic rock, chert and banded iron formation (BIF), and carbonaceous and micaceous pelites. The Lamego fold, which controls the Lamego deposit, is the most visible structure related to the D1–D2 event, with a perimeter of about 4.8 km and a maximum width of 450 m. The fold is defined by the layering of the mafic unit with minor BIF and large exposures of carbonaceous and micaceous pelites. It is a rootless, reclined, isoclinal, cylindrical fold with an axial trace striking northwest–southeast dipping 20° to 30°. The hinge zone is thickened and the limbs are thinned, with the limbs dipping 20° to 30° to the SE. Orebodies consist of the Lamego BIF, where gold-mineralized zones are related to iron-rich bands, and associated silicification zones. Replacement-style mineralization is associated with sulfide bands; mainly pyrite, As-rich pyrite, and arsenopyrite. Two structural generations, G1 and G2, are recognized and encompass a set of structural elements. The G1 structural generation developed in a progressive deformation event and resulted in structures oriented from NE to SW and dipping to the SE. Structures pertaining to the G2 structural generation are oriented N–S dipping to the W. The four major high-grade gold orebodies are Carruagem, Queimada, Arco da Velha, and Cabeça de Pedra. Their gold grade shows a spheroidal pattern and a distribution that varies along the S1–2 foliation. These lenses represent the hinge zone of F2 reclined folds with the plunge of the orebodies controlled by the F2 fold axes. The lower-grade gold lenses are controlled by pinch and swell, and locally expressed quartz boudins developed during D1–D2. They have two orthogonal directions, one to the NW–SE and the other to the NE–SW, thereby defining chocolate-tablet style boudinage. Hydrothermal monazite grains in a mineralized mafic volcanic rock indicate that mineralization formed at 2730 ± 42 Ma (U–Pb SHRIMP). Younger monazite dated at 2387 ± 46 Ma, and xenotime dated at 518.5 ± 9 Ma suggest Siderian and Cambrian imprint in the Lamego deposit area. The Cambrian age reflects the late stages of the Brasiliano orogenic cycle, which is expressed in the Lamego deposit by the S3 crenulation cleavage (trend NS and dip steeply to the E). Importantly, the Cambrian structural modification is responsible for the present geometry of the Lamego orebodies, but is not associated with hydrothermal alteration; it has not introduced any new gold and also has not caused remobilization of the orebodies or ore minerals.

Greenstone belt

Pelite

Arsenopyrite

Syncline

Banded iron formation

Greenschist

10.1016/j.oregeorev.2015.08.025

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Citations (38)

ITABIRITOS E MINÉRIOS DE FERRO DE ALTO TEOR DO QUADRILÁTERO FERRÍFERO – UMA VISÃO GERAL E DISCUSSÃO

Revista Geonomos (2000)

Carlos Alberto Rosiére Farid Chemale Júnior

Itabirites are Palaeoproterozoic metamorphic banded iron formations from the Itabira Group, MinasSupergroup, that crop out in the Quadrilátero Ferrífero District, Minas Gerais, Brazil. The followingcompositional types occur: quartz itabirite, being metamorphic jaspilites, dolomitic itabirite, beingdolomitized banded iron formations, and amphibolitic itabirite modified by the presence of pelitic sediments.These rocks are also associated to pyritic phyllites and hematitic phyllites. A multiple metamorphic –deformational history during two main tectonic events, the Palaeoproterozoic Transamazonian and theNeoproterozoic Brasiliano Event, produced a variety of mineralogical assemblages in the more impurefacies and hydrothermal alteration was responsible for carbonatization, intensive oxidation and mineralization.Hypogenic iron mineralization developed in two main phases resulting in thick massive bodies with norelationship to tectonic structures, denominated non-tectonic ores; and schistose ore associated to shearzone, denominated syn-tectonic ores. The mineralizing fluids might be of metamorphic origin, but theimportance of hypogenic fluids of magmatic origin is emphasized. Supergene processes on quartz andspecially dolomitic itabirites are also of utmost importance in the development of giant ore bodies.

Pelite

10.18285/geonomos.v8i2.155

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Citations (38)

Zircon U–Pb ages and Hf isotope compositions of Açucena Granite (Borrachudos Suite): Implications for Statherian-Cambrian tectono-magmatic evolution of the southern border of the São Francisco Craton, Brazil

Journal of South American Earth Sciences (2020)

Sylvio Dutra Gomes Rosaline Cristina Figueiredo e Silva Anthony I.S. Kemp João Orestes Schneider Santos Steffen Hagemann

Pegmatite

Anatexis

Metallogeny

Geochronology

10.1016/j.jsames.2020.102543

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Citations (12)

The chemical composition of specular hematite from Tilkerode, Harz, Germany: implications for the genesis of hydrothermal hematite and comparison with the Quadrilátero Ferrífero of Minas Gerais, Brazil

Mineralium Deposita (2013)

Alexandre Raphael Cabral Carlos Alberto Rosiére

10.1007/s00126-013-0459-2

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Citations (18)

THE ORIGIN OF HEMATITE IN HIGH-GRADE IRON ORES BASED ON INFRARED MICROSCOPY AND FLUID INCLUSION STUDIES: THE EXAMPLE OF THE CONCEICAO MINE, QUADRILATERO FERRIFERO, BRAZIL

Economic Geology (2004)

Carlos Alberto Rosiére

Iron ore

Greenstone belt

Infrared microscopy

10.2113/99.3.611

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Citations (5)

Modelos físicos do sistema de cavalgamento fundão-cambotas, no domínio da Zona de Cisalhamento das Cambotas, Quadrilátero Ferrífero, Minas Gerais

Brazilian Journal of Geology (2000)

Caroline Janette Souza Gomes Carlos Alberto Rosiére Milton Pereira Filho

Experiments were undertaken to investigate the structural evolution of the transpressional Cambotas Shear Zone, also known as the Cambotas Fault, which integrates the strongly curved Fundao-Cambotas Thrust System at the eastern portion of the Quadrilatero Ferrifero. The formation of the Cambotas Shear Zone was simulated in three physical models by the translation of a block which was supposed to reproduce the reactivation of preexisting structures, and by the formation of curvatures in fold-thrust belts. An orocline, associated to a thrust fault in the foreland, offered the most satisfying simulation of the study area. The first domain represents the Falha de Agua Quente System, in the eastern extremity of the Quadrilatero Ferrifero, and the second one, the Fundao-Cambotas Thrust System. This system has been formed under the boundary conditions of a thrust fault with staircase geometry, and the Cambotas Shear Zone as one of its lateral ramps. The Cambotas Shear Zone is characterized by a heterogeneous deformation, with transpression dominated by pure shear in the hinterland as a consequence of the oblique collision between the deformation front and the rigid block of the Caetes Metamorphic Complex in the northern part of the study area. In the foreland, the propagation of the deformation front along the rigid block has produced a transpression dominated by simple shear.

Transpression

Thrust fault

10.5327/rbg.v30i4.887

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Citations (1)

BIF-hosted iron mineral system: A review

Ore Geology Reviews (2015)

Steffen Hagemann Thomas Angerer Paul Duuring Carlos Alberto Rosiére Rosaline Cristina Figueiredo e Silva

Banded iron formation

Hypogene

Iron ore

Supergene (geology)

Yilgarn Craton

Ore genesis

10.1016/j.oregeorev.2015.11.004

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Citations (139)