Transformation of pentlandite to violarite under mild hydrothermal conditions

Tenailleau, Christophe; Pring, Allan; Etschmann, Barbara; Brugger, Joël; Grguric, Ben; Putnis, Andrew

doi:10.2138/am.2006.2131

Cited by 64 publications

(51 citation statements)

References 15 publications

(12 reference statements)

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“…Page 24/85 the replacement of pentlandite by violarite (Tenailleau et al 2006;Xia et al 2009a), and the replacement of calaverite by gold (Okrugin et al 2014;Zhao et al 2009). …”

Section: Accepted Manuscriptmentioning

confidence: 99%

Textural and compositional complexities resulting from coupled dissolution–reprecipitation reactions in geomaterials

Altree-Williams

Pring

Ngothai

et al. 2015

Earth-Science Reviews

129

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“…Page 24/85 the replacement of pentlandite by violarite (Tenailleau et al 2006;Xia et al 2009a), and the replacement of calaverite by gold (Okrugin et al 2014;Zhao et al 2009). …”

Section: Accepted Manuscriptmentioning

confidence: 99%

Textural and compositional complexities resulting from coupled dissolution–reprecipitation reactions in geomaterials

Altree-Williams

Pring

Ngothai

et al. 2015

Earth-Science Reviews

129

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“…Violarite is another economically important nickel sulfide mineral and thus has been the focus of a number of studies [5][6][7][8]. Secondary violarite that formed by alteration of pentlandite under mild hydrothermal conditions inherits the texture of the parent pentlandite and can thus be regarded as a pseudomorph.…”

Section: Introductionmentioning

confidence: 99%

“…Our preliminary study shows that this reaction follows a typical coupled dissolutionreprecipitation mechanism [9][10][11]. Considering that pentlandite ores usually contain pyrrhotite, this study attempted to evaluate the possible catalytic role of pyrrhotite in determining the kinetics of this replacement reaction.…”

Section: Introductionmentioning

confidence: 99%

The role of pyrrhotite (Fe7S8) and the sample texture in the hydrothermal transformation of pentlandite ((Fe,Ni)9S8) to violarite ((Ni,Fe)3S4)

Xia

Zhou

Pring

et al. 2007

React Kinet Catal Lett

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The catalytic role of pyrrhotite (Fe 7 S 8 ) in the reaction kinetics of the hydrothermal transformation of pentlandite ((Fe,Ni) 9 S 8 ) to violarite ((FeNi 2 S 4 ) was found to depend on the physical form of pyrrhotite. Pyrrhotite in fine scale intergrown with pentlandite boosts the reaction, whereas in a mechanical mixture of pyrrhotite and pentlandite, it plays the opposite role. This phenomenon was interpreted as result of dissolution of pyrrhotite under reaction conditions.

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“…In other words, it is very likely that crystallization of silicate minerals (including zircon) and sulphides was nearly contemporaneous. Presence of violarite can be attributed to either supergene and/or hydrothermal alteration of pentlandite (Tenailleau et al 2006) or this mineral may have formed as a primary exsolution phase from pentlandite (Grguric 2002). At Rožany-Kunratice, violarite clearly replaces pentlandite grains and/or forms secondary veinlets in large pyrrhotite grains.…”

Section: The Origin Of Pge Mineralization and Re-os Isotopic Signaturesmentioning

confidence: 99%

Geochronology and characteristics of Ni-Cu-(PGE) mineralization at Rožany, Lusatian Granitoid Complex, Czech Republic

Haluzová¹,

Ackerman²,

Pašava³

et al. 2015

Jour. Geosci.

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The Ni-Cu-(PGE) mineralization at Rožany is located in the northern part of the Bohemian Massif and it is hosted by gabbroic dykes (dolerites) cross-cutting the granitic Lusatian Granitoid Complex. The intrusion of dolerite is newly well constrained by in-situ LA-ICP-MS U-Pb zircon age of 349 ± 3 Ma (2σ), which is much younger than previous K-Ar and Pb-Pb data. The barren dolerites are characterized by high enrichments of some incompatible elements (e.g., LREE, Zr, Sr) and radiogenic Os isotopic composition suggesting their derivation from enriched (metasomatized) mantle source, possibly due to subduction processes. The mineralization itself is represented by pyrrhotite, chalcopyrite and pentlandite; the latter is commonly replaced by violarite most likely due to late-stage hydrothermal alteration. The origin and formation of at least some platinum-group minerals was probably closely associated with late-stage hydrothermal processes, causing remobilization of platinum-group elements from the primary base-metal sulphides. The Ni-rich ores exhibit the highest I-PGE (Os, Ir, Ru) concentrations whereas Pd and Pt tend to be enriched in Cu-rich ores. Observed variations in Re-Os isotopic compositions of the massive and disseminated ore types from the Rožany expressed by highly variable initial (349 Ma) γOs values of +50 to +134 in part indicates important, but variable amounts of incorporated crustal material. However, very similar 187 Re/188 Os values found in all rock types can be best explained by post-crystallization Re loss associated with late-stage hydrothermal alteration. When compared to other Ni-Cu-(PGE) mineralizations in the Bohemian Massif, the total PGE contents found in Rožany are much lower than those reported from the Ransko Massif, but similar to those in the Svitavy ultramafic Complex.

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Transformation of pentlandite to violarite under mild hydrothermal conditions

Cited by 64 publications

References 15 publications

Textural and compositional complexities resulting from coupled dissolution–reprecipitation reactions in geomaterials

Textural and compositional complexities resulting from coupled dissolution–reprecipitation reactions in geomaterials

The role of pyrrhotite (Fe7S8) and the sample texture in the hydrothermal transformation of pentlandite ((Fe,Ni)9S8) to violarite ((Ni,Fe)3S4)

Geochronology and characteristics of Ni-Cu-(PGE) mineralization at Rožany, Lusatian Granitoid Complex, Czech Republic

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