Kinetics and mechanism of chalcopyrite formation from Fe(II) disulphide in aqueous solution (&lt;200°C)

Rickard, David; Cowper, M. M.

doi:10.1016/0016-7037(94)90364-6

Cited by 21 publications

(10 citation statements)

References 15 publications

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“…It is likely that much of the Cu has already been precipitated as chalcopyrite at high temperatures within the vent chimney (Seyfried and Ding, 1995;Tivey, 1995). As a result of the initial cooling of hydrothermal fluid from 400-300 °C, the solubility of chalcopyrite decreases several orders of magnitude (Seyfried and Ding, 1995), resulting in rapid formation in the end-member fluid within the chimney and removal of the majority of the Cu from solution prior to formation of other metal sulfides (Rickard and Cowper, 1994). Chalcopyrite and other…”

Section: Precipitation Of Metal Sulfides In the Buoyant Plumementioning

confidence: 99%

Trace metal concentration and partitioning in the first 1.5 m of hydrothermal vent plumes along the Mid-Atlantic Ridge: TAG, Snakepit, and Rainbow

et al. 2015

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Please cite this article as: Findlay, Alyssa J., Gartman, Amy, Shaw, Timothy J., Luther III, George W., Trace metal concentration and partitioning in the first 1.5 meters of hydrothermal vent plumes along the Mid-Atlantic Ridge: TAG, Snakepit, and Rainbow, AbstractTo determine the significance of metal fluxes from hydrothermal vents, understanding the speciation, reactivity, and possible transformations of metals and metal sulfides within the hydrothermal plume is critical. In this study, we measure the concentration and partitioning of trace metals (Fe, Mn, Cu, Cd, Co, Pb, Ni) and sulfide phases within the first 1.5 meters of the rising plume at three vent fields (TAG, Snakepit, and Rainbow) along the Mid-Atlantic Ridge. A combination HCl/HNO 3 leaching method was used to differentiate metals present in metal mono-sulfides from those in pyrite and chalcopyrite. At all three vent sites, Mn and Fe are primarily in the < 0.2 µm (filtered) portion, whereas Cu, Co, Cd, and Pb are mainly in the unfiltered fraction. Significant concentrations of HNO 3 -extractable metals were found in the < 0.2 µm fraction at all three vent sites, indicating that they likely exist in a recalcitrant nanoparticulate phase such as pyrite or chalcopyrite. At TAG and Snakepit, Cu is correlated with Co, as Co enters into chalcopyrite and other CuFeS phases and Zn is correlated with Cd and Pb as they form discrete metal sulfide phases. At Rainbow, Zn, Cd, and Pb are correlated, but Cu and Co are not correlated. The Rainbow data are consistent with the higher metal to sulfide ratio found at Rainbow. These speciation differences are significant as both A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 mineral type and size will affect the amount of metal transported from the vent site and its availability for biogeochemical processes.

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Section: Precipitation Of Metal Sulfides In the Buoyant Plumementioning

confidence: 99%

Trace metal concentration and partitioning in the first 1.5 m of hydrothermal vent plumes along the Mid-Atlantic Ridge: TAG, Snakepit, and Rainbow

et al. 2015

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“…van der Laan et al, 1992;Rickard and Cowper, 1994;Pearce et al, 2006) and the predominant oxidation state of Fe in solution at elevated temperatures and a range of salinities is likely to be +2 (e.g. Seyfried and Ding, 1993;Liu et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

The controls of post-entrapment diffusion on the solubility of chalcopyrite daughter crystals in natural quartz-hosted fluid inclusions

et al. 2015

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“…England and Ostwald (1993) propose that atoll textures may form by the recrystallization of pyrite in the presence of a chalcopyrite gel and a similar mechanism may be responsible for the cobaltite-gersdorffite inclusions in bornite. It is, however, questionable whether the direct replacement of pyrite by Cu sulphides is reasonable at the low temperatures under which the ores formed (Rickard and Cowper, 1994).…”

Section: Discussionmentioning

confidence: 99%

A cobaltite-framboidal pyrite association from the Kupferschiefer: possible implications for trace element behaviour during the earliest stages of diagenesis

1999

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Cobaltite-cemented pyrite framboids are reported from the base of the Kupferschiefer in the LubinSieroszowice mining district in southern Poland. In the framboids, cobaltite occurs interstitial to the pyrite crystals. The cobaltite-cemented framboids are confined to within a few cm either side of the boundary between the Weissliegendes sandstone and the Kupferschiefer laminated organic-rich shales. Textural relations and distribution of the cobaltite is interpreted as indicating that the framboids acted as a site of preferred cobaltite precipitation and that the cobaltite precipitated in response to the changing chemical environment at the Weissliegendes/Kupferschiefer contact. It is proposed that the texture may have formed as a result of desorption of Co and/or As which had been adsorbed onto the monosulphide precursors to the framboidal pyrite. Desorption during the transition to pyrite resulted in cobaltite saturation within the framboid and subsequent precipitation. The source of the Co and As was probably oxyhydroxides which exist in the upper oxic part of the Weissliegendes.

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Kinetics and mechanism of chalcopyrite formation from Fe(II) disulphide in aqueous solution (<200°C)

Cited by 21 publications

References 15 publications

Trace metal concentration and partitioning in the first 1.5 m of hydrothermal vent plumes along the Mid-Atlantic Ridge: TAG, Snakepit, and Rainbow

Trace metal concentration and partitioning in the first 1.5 m of hydrothermal vent plumes along the Mid-Atlantic Ridge: TAG, Snakepit, and Rainbow

The controls of post-entrapment diffusion on the solubility of chalcopyrite daughter crystals in natural quartz-hosted fluid inclusions

A cobaltite-framboidal pyrite association from the Kupferschiefer: possible implications for trace element behaviour during the earliest stages of diagenesis

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