Development of the Ervidel-Roxo and Figueirinha-Albernoa volcanic sequences in the Iberian pyrite Belt, Portugal: Metallogenic and geodynamic implications

Codeço, Marta S.; Mateus, António; Figueiras, Jorge; Rodrigues, Pedro; Gonçalves, Luís

doi:10.1016/j.oregeorev.2018.05.009

Cited by 16 publications

(25 citation statements)

References 106 publications

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“…Identifying mineral pathfinders and developing their use for exploration require studying deposits to generate a detailed understanding of what controls the mineral composition and to what extent this reflects the chemical signature of the mineralization they are associated with. In the last decades, many studies have focused on mineral exploration tools based on fertility indicators and chemical vectoring (Kerrich and Wyman 1997;Kelley et al 2006;Jackson 2010;Cooke et al 2014;Wilkinson et al 2015;Champion and Huston 2016;McClenaghan and Layton-Matthews 2017;Soltani Dehnavi et al 2018;Dill 2018;Codeço et al 2018;Uribe-Mogollon and Maher 2018;Luz et al 2019). In that context, there is an increasing interest in using multivariate statistics and machine learning methods (Cheng et al 2011;Yang and Cheng 2014;Makvandi et al 2016aMakvandi et al , 2019Gonçalves et al 2018;Ordóñez-Calderón and Gelcich 2018;Grunsky and de Caritat 2019;Huang et al 2019;Gonçalves and Mateus 2019) and in developing discriminant diagrams to separate different styles of mineralization (Dupuis and Beaudoin 2011;Montreuil et al 2013;Makvandi et al 2016b;Fresia et al 2017;Huang et al 2019).…”

Section: Introductionmentioning

confidence: 99%

The imprint of hydrothermal fluids on trace-element contents in white mica and tourmaline from the Panasqueira W–Sn–Cu deposit, Portugal

et al. 2020

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White mica and tourmaline are the dominant hydrothermal alteration minerals at the world-class Panasqueira W–Sn–Cu deposit in Portugal. Thus, understanding the controls on their chemical composition helps to constrain ore formation processes at this deposit and determine their usefulness as pathfinder minerals for mineralization in general. We combine whole-rock geochemistry of altered and unaltered metasedimentary host rocks with in situ LA-ICP-MS measurements of tourmaline and white mica from the alteration halo. Principal component analysis (PCA) is used to better identify geochemical patterns and trends of hydrothermal alteration in the datasets. The hydrothermally altered metasediments are enriched in As, Sn, Cs, Li, W, F, Cu, Rb, Zn, Tl, and Pb relative to unaltered samples. In situ mineral analyses show that most of these elements preferentially partition into white mica over tourmaline (Li, Rb, Cs, Tl, W, and Sn), whereas Zn is enriched in tourmaline. White mica has distinct compositions in different settings within the deposit (greisen, vein selvages, wall rock alteration zone, late fault zone), indicating a compositional evolution with time. In contrast, tourmaline from different settings overlaps in composition, which is ascribed to a stronger dependence on host rock composition and also to the effects of chemical zoning and microinclusions affecting the LA-ICP-MS analyses. Hence, in this deposit, white mica is the better recorder of the fluid composition. The calculated trace-element contents of the Panasqueira mineralizing fluid based on the mica data and estimates of mica-fluid partition coefficients are in good agreement with previous fluid-inclusion analyses. A compilation of mica and tourmaline trace-element compositions from Panasqueira and other W–Sn deposits shows that white mica has good potential as a pathfinder mineral, with characteristically high Li, Cs, Rb, Sn, and W contents. The trace-element contents of hydrothermal tourmaline are more variable. Nevertheless, the compiled data suggest that high Sn and Li contents are distinctive for tourmaline from W–Sn deposits.

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Section: Introductionmentioning

confidence: 99%

The imprint of hydrothermal fluids on trace-element contents in white mica and tourmaline from the Panasqueira W–Sn–Cu deposit, Portugal

et al. 2020

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“…Together and properly managed, all these endeavours will optimize exploration, generating innovative insights on: (i) conceptual metallogenic modelling through improvements of current knowledge about critical factors ruling the progression of ore-forming processes in different scales of space and time, including geothermochronology (e.g. Wyborn et al, 1994;Holliday and Cook, 2007;Hagemann et al, 2007;Benavides et al, 2008;Tassinari et al, 2008;2015;Piercey, 2010;McCuaig et al, 2010;McCuaig and Hronsky, 2014;Huston et al, 2016;Smith et al, 2016;Groves et al, 2016;Codeço et al, 2018); (ii) distal manifestations of concealed ore systems by means of mineralogical and geochemical/isotopic criteria, which can also be used to discriminate targets with high metal contents and/or larger tonnage (e.g. Craig, 2001;Holk et al, 2003;Piché and Jébrak, 2004;Kelly et al, 2006;Kerrich and Wyman, 2007;Jackson, 2010;Cheng and Zhao, 2011;Dupuis and Beaudoin, 2011;Wang et al, 2012;Wilkinson et al, 2015;Zao et al, 2016;Champion and Huston, 2016;Dill, 2018;Gonçalves et al, 2018); (iii) combined data processing resulting from various geophysical methods and using inversion model techniques (e.g.…”

Section: Figura 1 (A) La Masa Total Elemental Estima (Mi) Como Una Fmentioning

confidence: 99%

Challenges and opportunities for a successful mining industry in the future.

Mateus¹,

Martins²

2019

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Modern models of sustainable economic growth are metal-intensive and will not be successful in the future unless a continuous supply of mineral-derived products is ensured. Despite this being logical, there is still a significant reluctance regarding mineral exploration and mining activities, often reflected in: (i) unfavourable public opinions; and (ii) absence of political measures or continuity of agendas that actually appreciate the way minerals are produced and the players directly or indirectly involved in this production. To succeed, the mining industry will have to (re)define its strategy and find innovative approaches to old problems and clearly demonstrate that mineral products can be efficiently delivered to support global development and assist suitable paths to welfare and quality of life, thus also providing real value to all concerned. In this study we give a concise review of the main challenges posed to the mining industry, and also indicate the most relevant opportunities and advance some proposals to constructively face the identified weaknesses and threats. The fundamental outcome is that the long-term balance between supply and demand of mineral products requires concerted actions on different fronts aiming: (i) the safeguarding of known resources; (ii) high-quality (scientifically and technologically driven) exploration surveys; (iii) improvements in mining and mineral transformation/ beneficiation; (iv) advances in consistent combinations of primary and secondary sources of raw materials, along with higher concerns on their judicious use; (v) effective and stable mining policies; and (vi) new insights on the role played by the mining industry through fruitful dialogues with society in general.

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“…A abundância relativa das rochas máficas possivelmente aumenta em profundidade, o que diversos trabalhos de geofísica voltados para a exploração mineral não publicados indicam (Codeço et al, 2018). As rochas máficas podem ser tanto alcalinas quanto toleíticas enquanto que as rochas félsicas são cálcio-alcalinas (Mitjavila et al, 1997;Thieblemont et al, 1998;Tornos, 2006).…”

Section: Complexo Vulcano Sedimentarunclassified

“…A Faixa Piritosa Ibérica é subdividida em diferentes regiões de maneiras distintas de acordo com as características das rochas presentes no Complexo VS (Tornos, 2006;Conde, 2016;Martin Izard et al, 2016;Codeço et al, 2018 (Solá et al, 2015;Rosa et al, 2009;Barrie et al, 2002) A compartimentação proposta por Martin Izard et al (2016) é questionada por Tornos (comunicação oral) pois, além do trabalho de mapeamento ser escasso, os depósitos são interpretados de acordo com a posição das rochas na estratigrafia (que por si só é questionável, visto que diversos contatos são tectônicos) e não em relação aos ambientes de formação dos sulfetos. Além do mais, para Conde (2016) (2006) e Conde (2016).…”

Section: Regiões Da Fpiunclassified

“…O ambiente deposicional destes litotipos evoluiu de uma plataforma continental estável (durante a sedimentação do Grupo FQ) para um ambiente de bacias de pull apart resultantes de uma colisão oblíqua (gerando as rochas vulcânicas e sedimentação concomitante do Complexo VS) e posteriormente para uma bacia de antearco sin-orogênica com sedimentação tipo flysch (sedimentação das rochas do Grupo Flysch do Baixo Alentejo) (Silva et al, 1990;Quesada et al, 1994, Tornos, 2006. Os corpos de sulfeto maciço ocorrem sempre associados a horizontes do Complexo VS, mais especificamente a rochas vulcânicas e vulcanoclásticas nos depósitos da parte norte da FPI e a folhelhos nos depósitos da parte sul (Tornos, 2006, Conde, 2016, Martin Izard et al, 2016Codeço et al, 2018). Os depósitos de sulfetos maciços da FPI se formaram através de dois processos distintos:…”

Section: Introductionunclassified

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Estudo isotópico de U-Pb, Lu-Hf e Ti em rochas vulcânicas associadas aos sulfetos maciços da Faixa Piritosa Ibérica (Espanha)

Mello¹

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In this work, new U-Pb, Ti and Lu-Hf isotope data are presented from the study of representative samples of the felsic volcanic rocks associated with the massive sulfide bodies of different regions of the Iberian Pyrite Belt (IPB). The IPB is a giant volcanogenic massive sulfide province divided into two distinct units, the Northern Region and Southern Region.The two regions are characterized by large geological differences, such as massive sulfide formation, host rock, ages, temperatures and magmatic sources. The U-Pb and Ti isotopes studies were performed at SHRIMP, while Lu-Hf studies were performed at LA-MC- ICPMS.The NorthernRegion is subdivided into two different domains, the Central Sector and the Northern Belt. The U-Pb isotopes of the volcanic rocks of the Northern Region show this region is associated with Tournaisian volcanism, a later volcanic interval in comparison with the widely recognized Strunian volcanism in the Southern Region. The rocks of the Northern Belt had a range associated with the massive sulfide bodies between 354-347 Ma, while La Zarza in the Central Sector had a range of 357-355 Ma. In Rio Tinto, the geochronological study was more thorough and characterized a wide range of intermittent pulses between 358-339 Ma. The main interval is associated with the VMS formation and dated between 352-348 Ma. The rocks of the Southern Region showed U-Pb ages associated with massive sulfide bodies between 365-359 Ma. Other ages in the range of 352-348 Ma are also observed in the Southern Region in plutonic rocks and a barren volcanic rock in Las Cruces but these samples are barren and are also different from Strunian rocks in relation to the crystallization temperature. Tournaisian volcanic rocks associated with massive sulfide bodies have temperatures of 49 Ti below 760°C, while the temperatures of Strunian volcanic rocks that have been studied in this thesis and by other authors are above 800°C. These colder temperatures are unexpected and complement the scenario presented in the literature for the IPB massive sulfide deposits and the literature as a whole, which shows the massive sulfide bodies associated with higher temperature volcanic bodies (T> 800°C). The Rio Tinto is the largest deposit of IPB and presents temperatures below 730°C. The ƐHf signatures obtained from the Lu-Hf isotopes also show the differences between the different IPF sectors. In the Northern Belt of the Northern Region there is a large amount of mantle material contributed and the average value of ƐHf is ~ -0.2. The Central Sector still has a contribution of this mantle material and has an average Hf signature of ~ -3.2. The Southern Region has ƐHf ~ -5.2 in Spain, while the Portuguese portion has ƐHf ~ -7.97. The geochronology of the volcanic Felsic unit associated with the Rio Tinto deposit was studied in detail and showed three distinct periods: Felsic Unit I, at 358 Ma, which marks the onset of the Felsic Unit volcanism in the Rio Tinto region. The Felsic Unit II is the unit related to the massive sulfide bodies and ...

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Development of the Ervidel-Roxo and Figueirinha-Albernoa volcanic sequences in the Iberian pyrite Belt, Portugal: Metallogenic and geodynamic implications

Cited by 16 publications

References 106 publications

The imprint of hydrothermal fluids on trace-element contents in white mica and tourmaline from the Panasqueira W–Sn–Cu deposit, Portugal

The imprint of hydrothermal fluids on trace-element contents in white mica and tourmaline from the Panasqueira W–Sn–Cu deposit, Portugal

Challenges and opportunities for a successful mining industry in the future.

Estudo isotópico de U-Pb, Lu-Hf e Ti em rochas vulcânicas associadas aos sulfetos maciços da Faixa Piritosa Ibérica (Espanha)

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