External sulphur in IOCG mineralization: Implications on definition and classification of the IOCG clan

Chen, Hong‐Yuan

doi:10.1016/j.oregeorev.2012.12.002

Cited by 79 publications

(22 citation statements)

References 24 publications

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“…This conclusion is in agreement with conceptual models on IOCG formation (e.g. Barton and Johnson, 1996;Williams et al, 2005;Williams et al, 2010;Chen, 2013;Barton, 2014) that involve multiple sulfur sources including magmatic sulfur (Marschik and Fontbote, 2001;Oliver et al, 2004;Pollard, 2006;de Haller and Fontbote, 2009) mixed with external sulfur such as seawater or evaporites (Haynes et al, 1995;Barton and Johnson, 1996;Barton and Johnson, 2000;Benavides et al, 2007;Chen, 2010), formation waters and metamorphic fluids (Kendrick et al, 2007;Monteiro et al, 2008) as well as sulfur contributed via reaction with previously formed pyrite (Wilson et al, 2003;Davidson et al, 2007).…”

Section: Introductionsupporting

confidence: 81%

“…Globally, IOCG deposits share many aspects of geologic environment and mineral association, but the source of metals and sulfur and the hydrothermal processes controlling mineralization are still poorly defined (Barton and Johnson, 1996;Pollard, 2000;Williams et al, 2005;Williams et al, 2010;Chen, 2013;Barton, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Gow et al, 1994;Haynes et al, 1995;Barton and Johnson, 1996;Barton, 2014), by remobilization of sulfur from preexisting sulfides such as pyrite (Ohmoto and Goldhaber, 1997;Schlegel and Heinrich, 2015) and by addition of sulfur from an external fluid (e.g. Chen, 2013). The presence of abundant barite and anhydrite in some IOCG deposits points to either moderate aqueous sulfate contents or mixing of a fluid with igneous sulfur (Pollard, 2000(Pollard, , 2006 with a possibly second sulfate-bearing fluid (Haynes et al, 1995;Barton, 2014).…”

Section: Introductionmentioning

confidence: 99%

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A magmatic source of hydrothermal sulfur for the Prominent Hill deposit and associated prospects in the Olympic iron oxide copper-gold (IOCG) province of South Australia

Schlegel

Wagner

Boyce

et al. 2017

Ore Geology Reviews

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Section: Introductionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A magmatic source of hydrothermal sulfur for the Prominent Hill deposit and associated prospects in the Olympic iron oxide copper-gold (IOCG) province of South Australia

Schlegel

Wagner

Boyce

et al. 2017

Ore Geology Reviews

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“…This has since been updated to be both inclusive and exclusive of a variety of mineralization styles (Williams et al, 2005;Corriveau, 2007;Groves et al 2010;Chen, 2013). The original IOCG definition of Hitzman et al (1992), followed by Williams et al (2005), has been streamlined in some recent classifications that have removed iron-oxide-apatite (IOA) from the IOCG model (Groves et al 2010;Chen, 2013), while others continue to show a possible relationship between magmatic-hydrothermal IOCG and IOA deposits (e.g., Mumin et al, 2010;Smith et al, 2012;Richards and Mumin, 2013a). Groves et al (2010) suggest that the only examples where IOA-type and IOCG deposits are related to one another are in Mesozoic and Cenozoic Andean-like convergent margin-settings (ie.…”

Section: Introductionmentioning

confidence: 99%

A Paleoproterozoic Andean-type iron oxide copper-gold environment, the Great Bear magmatic zone, Northwest Canada

Ootes

Snyder

Davis

et al. 2017

Ore Geology Reviews

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Iron oxide copper-gold (IOCG) and associated iron-oxide apatite (IOA) styles of metallic mineralization are recognized throughout the Paleoproterozoic Great Bear magmatic zone of the northwest Canadian Shield. The Great Bear magmatic zone was constructed between ca. 1876 and 1855 Ma on top of the older Hottah terrane, which preserves continental arc magmatism that began around ca. 2.0 to 1.97 Ga and continued between ca. 1.93 and 1.89 Ga. The Great Bear represents the final stages of ca. 150 million years of intermittent and pulsed magmatism related to an evolving continental orogenic belt. The preserved geology supports a dramatic geodynamic change in the subduction zone process at ca. 1875 Ma, a key driving mechanism for magma and metal mobilization, and was rapidly followed by a large-scale introduction of felsic-intermediate plutons. The overall tectonic setting is partially constrained from new and previously published geochemical data that show that the volcanic and plutonic rocks are high-K calc-alkaline to shoshonitic in nature (e.g., high K 2 O, Th/Yb, and Ce/P 2 0 5 ). They also have suprasubduction-zone geochemical signatures, including primitive mantle normalized positive Th and negative Nb, P, and Ti anomalies. The data support the primary melts were derived from a GLOSS-modified mantle wedge. Three-dimensional rendering of geophysical datasets suggest that two (of four) preserved surfaces within the upper mantle lithosphere, at 70 to 120 km depths, represent frozen, subducted oceanic slabs, and likely were the drivers for the bulk of Hottah and Great Bear arc magmatism. The older slab is northwest-striking and dips 12⁰ to 15⁰ northeast, whereas the younger is deeper and north-striking, dipping 13⁰ east. The geometry of the surfaces are comparable with 4D modeling, where a subduction zone is temporarily shut down due to plateau collision, and then steps oceanward and re-initiates; there is no need for polarity reversal of the subduction system. This new geometry and the related inferences about process should be the focus of future research in the region, but for the time-being it can be stated that these subduction and collisional processes were the first order control on lithospheric evolution, and therefore metallic mineralization. Overall, the Great Bear magmatic zone IOCG and related mineralization is not comparable to other Proterozoic IOCG belts, such as those in Australia. However, the complexity of mineralization styles, the spatial-temporal relationship between IOA and IOCG mineralization, the suprasubduction zone environment, and a major change in tectonic regime are features similar to Andean-type IOCG mineralization, as well as Cordilleran alkali porphyry Cu-A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT3 Au deposits. This further establishes the linkages between subduction zone processes and IOCG formation, as well as relationships in the IOCG-porphyry deposit continuum model.

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“…Figura 6 -Perfil esquemático de alteração hidrotermal em depósitos de óxido de ferro-cobreouro (Hitzman et al 1992 Figura 7 -Esquema mostrando relação entre origem dos fluidos, que incluiriam salmouras bacinais oxidadas ou água do mar, em níveis crustais mais rasos, e fluidos formacionais ou metamórficos em níveis crustais mais profundos, e a distribuição das zonas de alteração hidrotermal de diversos depósitos de óxido de ferro-cobre-ouro (Chen 2013 rico em apatita do corpo de minério Sequeirinho; E-Alteração Potássica representada por ortoclásio e sobreposta por clorita e cortada por veios de calcita-fluorita do depósito Alvo 118; F-Cloritização e veios de calcita do depósito Alvo 118; G-Alteração regional controlada por fraturas sódica (albita-magnetita) e sódico-cálcica (actinolita e clorita); H-Veio de escapolita marialítica transversal ao granodiorito das proximidades do depósito do Sossego (Xavier et al 2010). Abreviações: Ab = Albita; Act = Actinolita; Ap = Apatita; Cal = Calcita; Chl = Clorita; Ep = Epidoto; F = Fluorita; Grt = Granada; Gru = Grunerita; Kfs = Figura 9 -Amostras representativas de minério dos depósitos de óxido de ferro-cobre ouro da…”

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O depósito de óxido de ferro-cobre-ouro de Bacuri, Província Carajás, Pará: implicações de processos metassomáticos em rochas metaultramáficas para a evolução do sistema hidrotermal

Marques¹

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AgradecimentosAgradeço primeiramente a Deus por me dar o privilégio de estudar geologia. Apenas nessa profissão podemos estudar diretamente Sua obra. Olhar para as rochas é olhar para a sombra de Deus.A minha família, aos meus pais Paulo e Ana Maria, e aos meus irmãos, Luísa e Tiago.Apesar das constantes cobranças em relação ao meu prazo de entrega, agradeço pelo incentivo e apoio.Aos meus amigos e colegas do banco do saguão. Sem eles provavelmente teria terminado esta dissertação em um prazo muito mais curto. Por outro lado, eu não teria o mesmo gosto pela vida acadêmica, muito provavelmente nem teria seguido esse caminho sem eles. A Isaac Jamil Sayeg pela atenção e pelo dia de muito trabalho e esforço ao MEV (com direito a hora extra). Os resultados obtidos nesse dia foram fundamentais para a elaboração desta dissertação. Aos meus colegas de pós-graduação daAo professor Rainer Aloys Schultz-Güttler pelo incentivo em continuar na área acadêmica.Ao professor Johann Hans Daniel Schorscher pelas aulas de "Petrogênese, metalogênese e evolução crustal de terrenos arqueanos e paleoproterozóicos ". Sem essas aulas, muitas ideias aqui apresentadas nessa dissertação não teriam sequer sido cogitadas. Ao professores responsáveis pelas disciplinas da área de geologia econômica CaetanoJuliani, Gustavo Correa de Abreu e João Batista Moreschi. Trabalhar nessas disciplinas como monitor, além de uma honra, foi uma grande oportunidade de aprendizado. Aos dois últimos agradeço também pelas valorosas colocações realizadas durante meu exame de qualificação. et al. 2010). Abreviações: Ab = Albita; Act = Actinolita; Ap = Apatita; Au = Ouro Nativo; Bo = Bornita; Bt = Biotita; Cal = Calcita; Chl = Clorita; Cpy = Calcopirita; Hm = Hematita; Mi = Millerita; Mt = Magnetita; Po = Pirrotita; Py = Pirita; Sie = Siegenita; Sp = Esfalerita. como peça chave para a descoberta de novos depósitos nessa importante província mineral. XXXVI AbstractThe Bacuri deposit is hosted by rocks derived from volcanic and intrusive igneous protoliths, with widely contrasting chemical characteristics, from ultramafic to felsic composition. The metavolcanic host rocks may be related to remnants of Mesoarchean greenstone belts. The metavolcanic rocks, including those of metaultra mafic character The recognition and the detailed study of the processes and products generated by metasomatic and hydrothermal alteration events are fundamental to understand the genesis of copper deposits in Carajás Province. The advancement in this field of geological knowledge may be a key factor to discovery new deposits in this important mineral province. outros depósitos (e.g., Castanha, Bacaba, Jatobá e Visconde) em avaliação pela VALE.Importantes avanços no conhecimento dos depósitos cupro-auríferos do Cinturão Sul do Cobre da Província Carajás têm sido alcançados. Entre esses avanços, inclui-se a proposição de modelos descritivos, nos quais é identificada: associação do minério com extensas zonas de alteração hidrotermal alcalina (sódica e/ou potássica); enriquecimento em ETR...

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External sulphur in IOCG mineralization: Implications on definition and classification of the IOCG clan

Cited by 79 publications

References 24 publications

A magmatic source of hydrothermal sulfur for the Prominent Hill deposit and associated prospects in the Olympic iron oxide copper-gold (IOCG) province of South Australia

A magmatic source of hydrothermal sulfur for the Prominent Hill deposit and associated prospects in the Olympic iron oxide copper-gold (IOCG) province of South Australia

A Paleoproterozoic Andean-type iron oxide copper-gold environment, the Great Bear magmatic zone, Northwest Canada

O depósito de óxido de ferro-cobre-ouro de Bacuri, Província Carajás, Pará: implicações de processos metassomáticos em rochas metaultramáficas para a evolução do sistema hidrotermal

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