Sulphur Isotope Ratios in the McArthur Lead-Zinc-Silver Deposit

Smith, J. W.; Croxford, N. J. W.

doi:10.1038/physci245010a0

Cited by 47 publications

(24 citation statements)

References 5 publications

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“…However it is unclear if growth of py2 is due to local remobilisation or net addition of pyrite. The differences in isotope systematics of pyrite and ore minerals [5,6] suggests that the formation of much of the pyrite and sphalerite are decoupled, so values of q are most likely close to 1, or greater if there is significant pyrite addition. A nominal upper limit of q of 1.35 is consistent with the increase in the FeO content (Table 1) in mineralised rocks and with the observation that up to $20% of pyrite in the mineralised rocks is stage 2 pyrite (py2) that overprints earlier sulfides [7,13].…”

Section: Combination Of Mass Balance Expressionsmentioning

confidence: 97%

“…Both py1 and sp1 represent over 80% of the total pyrite and sphalerite found at the HYC deposit [13]. However, the pyrite and sphalerite sulfur isotope signatures are decoupled, which suggests that the two phases did not form in isotopic equilibrium [5,6]. Stage 2 sphalerite, sp2, makes up 15 -20% of the sphalerite at HYC and is often associated with carbonate (e.g.…”

Section: Geological Settingmentioning

confidence: 98%

“…2), with ore concentrated in fine-grained silt-dominated beds. Coarser grained beds interpreted as debris flows or turbidites are less mineralised [5,21]. Pyrite and ore minerals (sphalerite and galena) form up to 60 vol% of the rock in some layers.…”

Section: Geological Settingmentioning

confidence: 99%

“…The relative importance of synsedimentary, syndiagenetic and epigenetic ore mineral deposition, and of the involvement of hydrothermal fluids, seawater and basin brines is controversial, in spite of extensive characterisation of mineral textures [2][3][4], isotopic compositions [5][6][7] and the organic geochemistry [e.g. [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Combined sulfur, carbon and redox budget constraints on genetic models for the Here’s Your Chance Pb–Zn deposit, Australia

Dick

Evans

Holman

et al. 2014

GeoResJ

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a b s t r a c tThe formation of base metal sulfide deposits requires not only a source of metals but also reduced sulfur. If incoming sulfur is present in ore fluids as sulfate, then a source of electrons is needed to drive the reduction of sulfate to sulfide. The oxidation of organic matter can release electrons that provide the reducing capacity, whether it be in low-or high-temperature settings that are conducive to biological or thermochemical sulfate reduction (BSR or TSR). The amounts of organic matter reacted and sulfide minerals formed can be estimated by mass balance calculations. In this study, an integrated mass balance expression is formulated that takes into account the sulfide mineral content and organic carbon content and H/C ratios of mineralised and non-mineralised rocks. Model calculations based on carbon, sulfur and redox budget balances suggest that the extent of oxidation of the organic matter present at the Here's Your Chance (HYC) Pb-Zn deposit is insufficient for reduction of the required quantity of sulfate. The results imply that externally derived reducing capacity and/or reduced sulfur is required to form the metal resource. Possible sources include hydrocarbon-rich fluids from deeper parts of the sedimentary sequence or formation of sulfide and organic matter as products of BSR during sedimentation/early diagenesis. However, the observed oxidation of organic matter associated with the deposit suggests that at least some reducing capacity is locally derived. Therefore, our calculations are consistent with genetic models for HYC that have multiple sources of redox budget for sulfate reduction.

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Section: Combination Of Mass Balance Expressionsmentioning

confidence: 97%

Section: Geological Settingmentioning

confidence: 98%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Combined sulfur, carbon and redox budget constraints on genetic models for the Here’s Your Chance Pb–Zn deposit, Australia

Dick

Evans

Holman

et al. 2014

GeoResJ

View full text Add to dashboard Cite

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“…Fine-grained intergrowths were liberated by crushing and magnetic separation. Following this, chemical leaching (Smith and Croxford 1973) proved to be effective for some samples in separating galena from less soluble sulphide minerals. Physical separations were checked using polished grain mounts and chemical extractions were monitored by atomic absorption spectroscopy.…”

Section: Analytical Proceduresmentioning

confidence: 97%

Fluid inclusion and sulphur isotope evidence for syntectonic mineralisation at the Elura mine, southeastern Australia

Seccombe

1990

Mineral. Deposita

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Abstract. Fluid inclusion and sulphur isotope data for the discordant, metasediment-hosted massive sulphide deposit at Elura are consistent with a syntectonic origin of the orebodies. Thermometric and laser Raman microprobe analyses indicate that two-phase, primary fluid inclusions are low salinity and HzO-CO2-CH 4 types. Inclusion fluids from quartz in ore yield homogenisation temperatures (T0 ranging from 298 ~ to 354~ (mean 320 ~ They are likely to have been trapped close to the solvus of the H20-COz-(CH4-NaC1 ) system and thus should give temperatures of the mineralising fluid. An additional, low T h population of later fluid inclusions is recognised in quartz from ore and syntectonic extension veins in the adjacent wallrock. Th'S for these low CO2-bearing inclusions range from 150 to 231~ (mean 190 c~C), and should be considerably lower than true trapping temperatures. Sulphur isotopic composition (~34S) of pyrite, sphalerite, pyrrhotite and galena ranges from 4.7 to 12.6%o and indicates a sulphur source from underlying Cobar Supergroup metasediments. An average temperature of 275 ~ from the sphalerite-galena sulphur isotopic thermometer suggests isotopic re-equilibration below peak metamorphic temperatures.

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A selected bibliography of biomedical and environmental applications of stable isotopes. IV—17O,18O and34S 1971-1976

Klein

1978

Biol. Mass Spectrom.

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Sulphur Isotope Ratios in the McArthur Lead-Zinc-Silver Deposit

Cited by 47 publications

References 5 publications

Combined sulfur, carbon and redox budget constraints on genetic models for the Here’s Your Chance Pb–Zn deposit, Australia

Combined sulfur, carbon and redox budget constraints on genetic models for the Here’s Your Chance Pb–Zn deposit, Australia

Fluid inclusion and sulphur isotope evidence for syntectonic mineralisation at the Elura mine, southeastern Australia

A selected bibliography of biomedical and environmental applications of stable isotopes. IV—17O,18O and34S 1971-1976

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