Detrital zircon without detritus: a result of 496-Ma-old fluid–rock interaction during the gold-lode formation of Passagem, Minas Gerais, Brazil

Cabral, Alexandre Raphael; Zeh, Armin

doi:10.1016/j.lithos.2014.10.011

Cited by 37 publications

(10 citation statements)

References 59 publications

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“…Nevertheless, we stress that this classification should only be taken as a 'rule of thumb' and that each case would be different. For example, zircon might give very imprecise and discordant dates while xenotime from the same sample would return more precise and concordant dates (e.g., Cabral and Zeh 2015). Corfu and Lightfoot (1996); Schärer et al (1997); Amelin et al (1999); Wingate and Compston (2000); Müller et al (2005); Li et al (2005) Romer and Smeds (1994); ; ; Romer and Smeds (1997); Glodny et al (1998); Smith et al 2004 Low to moderate amount of common Pb; Titanites BLR-1 and MKED-1 proposed as matrixmatched standards (Aleinikoff et al, 2007;Spandler et al, 2016), common use of zircon or in-house standards.…”

Section: What Mineral Can We Date With the U-pb System And What Does mentioning

confidence: 99%

U–Pb dating of mineral deposits: From age constraints to ore-forming processes

Chelle-Michou¹,

Schaltegger²

2018

Preprint

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The knowledge of the timing and duration of ore-forming processes are perhaps one of the most desirable pieces of information that geologists require to draw a complete picture of the deposit and to put its genesis into a coherent regional or even global geological framework. In many cases, it represents an essential parameter for establishing detailed genetic models, and can critically impact on exploration strategies. This necessarily requires a reliable, precise and accurate geochronometer. This chapter reviews the basics of the U–Pb geochronology and the most commonly used dating techniques and minerals while pointing out their respective advantages, weaknesses and potential pitfalls. Through a series of case studies, we illustrate the various usages of U–Pb dating for the study of mineral deposits. Admittedly, U–Pb geochronology is a field that is strongly biased toward the use of zircon and this chapter is not an exception. Nevertheless, we will also shed light on U–Pb dating applied to less commonly encountered and dated minerals.

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Section: What Mineral Can We Date With the U-pb System And What Does mentioning

confidence: 99%

U–Pb dating of mineral deposits: From age constraints to ore-forming processes

Chelle-Michou¹,

Schaltegger²

2018

Preprint

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“…According that, we believe that this high temperature alteration occurred well after the 1.75 Ga São Timóteo crystallization, however, we should also consider the 1.5 Ga age proposed by Maruejol (1989) and Cordani et al, (1992). activity widespread in the Araçuaí orogen, also studied by other authors (Scholz et al, 2012;Cabral et al, 2013;Cabral and Zeh, 2015;Gonçalves et al, 2019).…”

Section: Thermal and Temporal Constrainssupporting

confidence: 53%

“…This process was responsible for important ore deposits such as the giant Eastern Brazilian Pegmatite Province (Pedrosa-Soares et al, 2011b), Au mineralization in the Southern Espinhaço Range and in the Quadrilátero Ferrífero (Cabral et al, 2013;Cabral and Zeh, 2015), and several meter to kilometer-scale quartz veins (Scholz et al, 2012, Gonçalves et al 2019 (Pedrosa-Soares et al, 2011b;Scholz et al, 2012, Cabral et al, 2013and Cabral and Zeh., 2015). This time interval is related to the extensional collapse of the Araçuai orogeny and multi-sourced fluid production from deep to shallow crustal levels that resulted in significant mineralization and affected an area of more than 400,000 km 2 along the eastern border of the São Francisco craton.…”

Section: Metasomatic Temporal Evolution Of the Albitite Rocksmentioning

confidence: 99%

Origem e evolução dos depósitos de urânio na região noroeste da Província Uranífera de Lagoa Real, Bahia, Brasil

Santos¹

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Tese apresentada ao Curso de Pós-Graduação em Ciência e Tecnologia das Radiações, Minerais e Materiais (CDTN-Brasil), como requisito parcial à obtenção do título de Doutor em Ciência e Tecnologia dos Minerais e Meio Ambiente, e à Escuela de doctorado da Universidad de Salamanca (USAL-Espanha) como requisito parcial à obtenção do título de Doctor en Geología. Área de concentração -CDTN: Ciência e Tecnologia dos Minerais e Meio Ambiente. Línea de investigación -USAL: Caracterización geoquímica e isotópica de rocas, minerales, y de productos de consumo humano para establecer procedencia y justificar denominaciones de origen. Belo Horizonte, Dezembro de 2020 Agradecimentos Ao CDTN por prover a estrutura física para o desenvolvimento desta tese, aos pesquisadores e funcionários do CDTN e PGCDTN. A Coordenação de Aperfeiçoamento de Pessoal de Nível Superior -Brasil (CAPES) pelo apoio financeiro provendo a bolsa de doutorado, em especial pela bolsa do Programa de Doutorado Sanduíche no Exterior (Pr. n° 88882.442551/2019-01).Às Industrias Nucleares do Brasil na pessoa do geólogo Evando Carele e do técnico Ailton, Coordenador de Geologia e Supervisor de Lavra, respectivamente, que sempre nos acompanham nas etapas de campo e prontamente nos atendem quando necessário.Ao time de orientadores Dr. Francisco Javier, Dr. Alexandre Cabral e Dr. Clemente Recio. Ao Dr. Francisco Javier que me acompanhou durante toda a pós-graduação.Obrigada pela paciência, compreensão e incentivo durante estes anos. Ao Dr. Alexandre Cabral por ter aceitado encarar esse trabalho, por ter engrandecido essa tese com discussões, apoio e abrindo portas. Ao Dr. Clemente Recio por ter me recebido muito bem em Salamanca e pela disposição em ajudar. O convívio diário com todos vocês certamente foi um aprendizado à parte. Aos Drs. Michael Wiedenbeck e Alexander Rocholl por terem me recebido no GFZ-Potsdam, pela atenção e discussões durante e após as análises de SIMS. Ao Dr. Adrian Boyce pelo auxilio durante as analises de isótopos estáveis na SUERC em Glasgow. Aos técnicos dos laboratórios de preparação de amostras da UERJ (LGPA) e UFOP pelo grande auxílio. À Dr. Kathryn Cutts pelas incansáveis correções e discussões nos manuscritos e por me auxiliar a lidar com o submundo das revistas científicas.

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“…A recent study confirms this hypothesis by the demonstration of resetting of older zircons by ca. 496 Ma old hot fluid rock interactions in the area of Passagem [45].…”

Section: Gold Concentration During Collapse Tectonicsmentioning

confidence: 99%

Structural Control of Ore Deposits: The Role of Pre-Existing Structures on the Formation of Mineralised Vein Systems

Chauvet

2019

Minerals

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The major role played by pre-existing structures in the formation of vein-style mineral deposits is demonstrated with several examples. The control of a pre-existing decollement level on the formation of a crustal extension-related (collapse) gold deposit is first illustrated in the Quadrilátero Ferrífero from Brazil. Shear zone and decollement structures were also examined and shown to control veins formation by three distinct processes: (i) re-aperture and re-using of wrench shear zones in the case of Shila gold mines (south Peru); (ii) remobilisation of metal in volcanic-hosted massive sulphide (VHMS) deposit by subsequent tectonic events and formation of a secondary stockwork controlled by structures created during this event (Iberian Pyrite Belt, Spain); (iii) formation of economic stockwork by contrasting deformation behaviours between ductile black schist versus brittle more competent dolomite (Cu-Ifri deposit, Morocco). Two examples involve changing of rheological competence within zones affected by deformation and/or alteration in order to receive the mineralisation (case studies of Achmmach, Morocco, and Mina Soriana, Spain). The last case underscores the significance of the magmatic-hydrothermal transition in the formation of mesothermal gold deposits (Bruès mine, Spain). All these examples clearly demonstrate the crucial role played by previously formed structures and/or texture in the development and formation of ore deposits.Minerals 2019, 9, 56 2 of 22 improve mining exploration strategies. I will present and discuss seven case studies of metal-bearing veins with different modes of formation that highlight the role of pre-existing features on their development. This aspect seems to be frequently underestimated, at least in the case of vein deposits, and this work aims to demonstrate its significance in the development of exploration and exploitation programs. The re-using of some previously formed structures has, in that case, a significant but passive role with respect to the formation of the economic feature. This concept is already exemplified in another contribution of this volume [18]. Each of the seven cases presented herein include a brief overview of the regional geology and deformation history, followed by a detailed geometrical and textural analysis of ore-bearing veins and a regional-scale genetic model that integrates these data. The relationships between neo-formed structures versus pre-existing ones will be highlighted in each case as well as its implications for regional vein distribution and, consequently, exploration programs.

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Detrital zircon without detritus: a result of 496-Ma-old fluid–rock interaction during the gold-lode formation of Passagem, Minas Gerais, Brazil

Cited by 37 publications

References 59 publications

U–Pb dating of mineral deposits: From age constraints to ore-forming processes

U–Pb dating of mineral deposits: From age constraints to ore-forming processes

Origem e evolução dos depósitos de urânio na região noroeste da Província Uranífera de Lagoa Real, Bahia, Brasil

Structural Control of Ore Deposits: The Role of Pre-Existing Structures on the Formation of Mineralised Vein Systems

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