WITHDRAWN: Processes affecting the sulfur to selenium ratio in magmatic nickel–copper and platinum-group element deposits

Queffurus, Matthias; Barnes, Sarah‐Jane

doi:10.1016/j.oregeorev.2013.08.009

Cited by 1 publication

(6 citation statements)

References 96 publications

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“…Figure 7 shows how the Platinova Reef sulfides compare to other magmatic sulfide deposits in terms of S/Se ratio and PGE tenor. Interestingly, the sulfides of the Platinova Reef plot along the same general trend of increasing PGE tenor with decreasing S/Se ratio that Queffurus and Barnes (2015) show for all other magmatic sulfide deposits (Fig. 7).…”

Section: Precious and Semimetal Characteristics Of The Sulfidessupporting

confidence: 64%

“…4d), with our sample from the Upper Zone having a S/Se ratio of ~520 in bornite, and 470 in chalcopyrite (Table 2). The Platinova Reef therefore has the lowest S/Se ratios recorded from any magmatic sulfide deposit (see review by Queffurus and Barnes 2015).…”

Section: Selenium Concentrations and S/se Ratiosmentioning

confidence: 99%

“…Furthermore, they have the highest Se concentrations (400-1200 ppm) ever recorded in magmatic sulfide ores (c.f. Queffurus and Barnes 2015). For comparison, Se is generally present in sulfide minerals in the range of tens of ppm, up to around 250 ppm in some sulfide minerals (e.g., Dare et al 2010;Piña et al 2013, Prichard et al 2013Smith et al 2014) and up to 455 ppm in sulfides of the Lac des Isles Complex (Djon and Barnes 2012).…”

Section: Precious and Semimetal Characteristics Of The Sulfidesmentioning

confidence: 99%

“…Thus, there needs to be a mechanism by which the majority of the PGE within the Skaergaard magma can be concentrated into a zone of up to a few tens of meters, containing very tiny Fig. 7 Range of S/Se ratio versus Pt + Pd tenor for the Platinova Reef sulfides in comparison with a selection of global magmatic sulfide deposits from Queffurus and Barnes (2015). Platreef data from McDonald et al (2012).…”

Section: Implications For Models For the Platinova Reefmentioning

confidence: 99%

“…4c), provide further insight. Queffurus and Barnes (2015) show that there are number of syn-and post-magmatic processes that can affect S/Se ratios, many of which will cause a decrease in S/Se, and as such, S/Se ratios can be used to trace a number of ore-forming and modifying processes. Of those which can cause a lowering of the initial S/Se ratios include: increases in R factor (or an analogous process such as sulfide dissolution), metamorphism, hydrothermal alteration and serpentinization.…”

Section: Evidence For Enrichment Of a Boundary Layermentioning

confidence: 99%

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Extreme enrichment of Se, Te, PGE and Au in Cu sulfide microdroplets: evidence from LA-ICP-MS analysis of sulfides in the Skaergaard Intrusion, east Greenland

Holwell

Keays

McDonald

et al. 2015

Contrib Mineral Petrol

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evidence implies that there is no significant post-magmatic hydrothermal S loss and that the metal profiles are essentially a function of magmatic processes. We propose that to generate these extreme precious and semimetal contents, the sulfides must have formed from an anomalously metal-rich package of magma, possibly formed via the dissolution of a previously PGE-enriched sulfide. Other processes such as kinetic diffusion may have also occurred alongside this to produce the ultra-high tenors. The characteristic metal offset pattern observed is largely controlled by partitioning effects, producing offset peaks in the order Pt+Pd>Au>Te>Se>Cu that are entirely consistent with published D values. This study confirms that extreme enrichment in sulfide droplets can occur in closed-system layered intrusions in situ, but this will characteristically form ore deposits that are so low in sulfide that they do not conform to conventional deposit models for Cu-Ni-PGE sulfides which require very high R factors, and settling of sulfide liquids.

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Section: Precious and Semimetal Characteristics Of The Sulfidessupporting

confidence: 64%

Section: Selenium Concentrations and S/se Ratiosmentioning

confidence: 99%