Deformational and metamorphic processes in the formation of mesothermal vein-hosted gold deposits — examples from the Lachlan Fold Belt in central Victoria, Australia

Cox, S. F. J.; Wall, V. J.; Etheridge, M. A.; Potter, T. F.

doi:10.1016/0169-1368(91)90038-9

Cited by 279 publications

(101 citation statements)

References 27 publications

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“…However, this is not a typical feature of other metasedimentary-hosted vein gold deposits (e.g. Cox et al 1991). Mineralogical and textural transformations accompanying wall-rock alteration were observed surrounding the main mineralized vein systems (Fig.…”

Section: Geology and Mineralogy Of The Depositsmentioning

confidence: 94%

Metaturbidite-hosted gold deposits, Córrego do Sítio lineament, Quadrilátero Ferrífero, Brazil

Júnior

Lobato

Lima³

et al. 2015

Braz. J. Geol.

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A study of geology and rocks paragenesis has been conducted at the Córrego do Sítio auriferous lineament, containing the Cachorro Bravo, Laranjeiras and Carvoaria metaturbidite-hosted lode-gold deposits located in the Quadrilátero Ferrífero Region, Minas Gerais, Brazil. These representative deposits are described to illustrate the essentially similar general character of all the deposits of lineament as well as the wide compositional and mineralogical differences in the ore of the different deposits, where, for the Cachorro Bravo deposit, a geological mapping included two underground mine galleries. The Córrego do Sítio unit is a metamorphosed turbidite in an alternating sequence of metagraywackes and phyllites, with parallel to discordant metamafic dikes and sills. The ore zone is predominantly hosted at the stratigraphic break between metasedimentary and metamafic rocks. Four deformation events affected the mine sequence. Mineralized veins and veinlets are considered to have formed within a brittle-ductile shear-zone environment and occurred in multiple episodes. Different vein types are recognized, but the most important volumetrically is a S 1 -concordant type characterized by smoky and milky quartz-carbonate-sulfide ± sulfosalts veins. Veins are dominated by quartz, but locally they are characterized by carbonate and a large variety of sulfide and sulfosalt minerals. Pyrite is the commonest associated sulfide mineral, followed by arsenopyrite and pyrrhotite. An extensive mineralogical study of polished sections has confirmed different generations of sulfide minerals. The sulfides and sulfosalt minerals are interrelated in the veins and disseminated on wall rocks. The data are consistent with a genetic models related to other Archean lode-gold deposits.KEYWORDS: lode-gold deposits; orogenic gold; metaturbidite gold deposit Metaturbidite-hosted gold deposits, RESUMO: O estudo da geologia e paragênese do lineamento aurífero Córrego do Sítio foi conduzido, contendo os depósitos Cachorro Bravo, Laranjeiras e Carvoaria. Esses depósitos auríferos, do tipo lode, hospedados em sequência metaturbidítica ocorrem na região do Quadriláte-ro Ferrífero, Minas Gerais, Brasil. Esses três importantes depósitos são descritos para ilustrar as características semelhantes, composição mineralógica e diferenças no tipo de minério ao longo do lineamento. Para o depósito de Cachorro Bravo, o mapeamento geológico inclui duas galerias subterrâneas. A unidade Córrego do Sítio é composta por uma sequência turbidítica com alternância de metagrauvacas e filitos, associada a diques e sills metamáficos, paralelos a discordantes. A zona de

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Section: Geology and Mineralogy Of The Depositsmentioning

confidence: 94%

Metaturbidite-hosted gold deposits, Córrego do Sítio lineament, Quadrilátero Ferrífero, Brazil

Júnior

Lobato

Lima³

et al. 2015

Braz. J. Geol.

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“…Cox et al (1991), Hodgson (1989) et Price et Cosgrove (1990) Les travaux réalisés précédemment par SOQUEM et par deux étudiants à la maîtrise (Shaw, 1991;Cadieux, 2000) ont apporté une connaissance générale de la stratigraphie, de la structure, du métamorphisme et de la minéralisation dans le secteur. De plus, ces études ont permis de caractériser l'altération hydrothermale associée au gîte et de mettre en évidence un pli régional P2 affectant la foliation principale SQ-SJ.…”

Section: Veines Associées Au Plissementunclassified

Minéralisation et déformation du fîte aurifère de la zone Eau Claire, propriété Clearwater, Baie James /

Tremblay¹

2006

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DECEMBRE 2006 Mise en garde/AdviceAfin de rendre accessible au plus grand nombre le résultat des travaux de recherche menés par ses étudiants gradués et dans l'esprit des règles qui régissent le dépôt et la diffusion des mémoires et thèses produits dans cette Institution, l'Université du Québec à Chicoutimi (UQAC) est fière de rendre accessible une version complète et gratuite de cette oeuvre.Motivated by a desire to make the results of its graduate students' research accessible to all, and in accordance with the rules governing the acceptation and diffusion of dissertations and theses in this Institution, the Université du Québec à Chicoutimi (UQAC) is proud to make a complete version of this work available at no cost to the reader.L'auteur conserve néanmoins la propriété du droit d'auteur qui protège ce mémoire ou cette thèse. Ni le mémoire ou la thèse ni des extraits substantiels de ceux-ci ne peuvent être imprimés ou autrement reproduits sans son autorisation.The author retains ownership of the copyright of this dissertation or thesis. Neither the dissertation or thesis, nor substantial extracts from it, may be printed or otherwise reproduced without the author's permission. RESUME L'objectif de cette étude menée en collaboration avec la compagnie SOQUEM était de mettre en relation la minéralisation, l'altération et la déformation au sein du gîte Eau Claire. Le gîte Eau Claire est la principale zone minéralisée de la propriété Clearwater.La propriété Clearwater est située dans la bande volcano-sédimentaire de la Rivière Eastmain Inférieure dans la Sous-province de la Rivière La Grande. La zone Eau Claire est située dans la charnière d'un pli régional. La minéralisation aurifère, formée de veines de quartz-tourmaline pauvres en sulfures ainsi que de schistes à aetinote-tourmaline, est encaissée dans des roches volcano-sédimentaires métamorphisées au faciès des amphibolites.

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“…The Victorian folds are relatively cylindrical, and local culminations in fold axis curvature are often sites for gold-bearing quartz veins, with local shoots tending to parallel the fold axis (Thomas 1953a, b). The Victorian goldfields exhibit classic vein structural styles, in particular saddle-reefs, extension fracture arrays, and dilatant fault jogs (Cox et al 1991). These veins are inferred to have been emplaced during the later stages of fold tightening.…”

Section: Veinsmentioning

confidence: 99%

Structural setting of the Globe‐Progress and Blackwater gold mines, Reefton goldfield, New Zealand

Rattenbury¹,

Stewart²

2000

New Zealand Journal of Geology and Geophysics

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Globe-Progress and Blackwater mines, the two largest mines in the Reefton goldfield of North Westland, have been placed into a regional structural context dominated by upright, tight folding of the host-rock Ordovician Greenland Group turbidites. The Greenland Group lacks distinctive lithostratigraphic marker horizons or biostratigraphic control, but mapping out areas of common structural facing from the determination of bedding-cleavage vergence along two transects has revealed a series of northtrending, generally shallow plunging folds. Undisrupted fold hinge closure is rarely seen, but the bedding-cleavage vergence boundaries are inferred to be fold hinge regions or in some instances post-folding faults. Vergence boundaries are often accompanied by changes in sedimentological younging. The technique defines the location of fold hinges, faults and, potentially, because of the structural control on mineralisation, gold-bearing quartz veins.The Globe-Progress gold-bearing quartz vein system occurs in a zone of relatively tight and shorter wavelength folds within a wider framework of more open, longer wavelength, east-verging folds. On the western flanks of Globe Hill, the Globe-Progress shear separates east-verging folded strata in the hanging wall from more symmetrically folded, commonly overturned strata in the footwall. The shear curves from an easterly strike to a southerly strike and steepens from 30-40° dips at depth to near-surface dips of 70-80°. Minor structures in the hanging wall indicate west over east-directed movement of the Globe-Progress shear. The Blackwater quartz vein system occurs parallel to steeply west-dipping, west-facing strata in a section of tight upright folds. The folds occur within the hinge area of a regional synclinal structure, which in turn is one of a series of 4-5 km long wavelength folds. G99033

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Deformational and metamorphic processes in the formation of mesothermal vein-hosted gold deposits — examples from the Lachlan Fold Belt in central Victoria, Australia

Cited by 279 publications

References 27 publications

Metaturbidite-hosted gold deposits, Córrego do Sítio lineament, Quadrilátero Ferrífero, Brazil

Metaturbidite-hosted gold deposits, Córrego do Sítio lineament, Quadrilátero Ferrífero, Brazil

Minéralisation et déformation du fîte aurifère de la zone Eau Claire, propriété Clearwater, Baie James /

Structural setting of the Globe‐Progress and Blackwater gold mines, Reefton goldfield, New Zealand

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