Application of the Re‐Os isotopic system to the study of Precambrian magmatic sulfide deposits of Western Australia

Lambert, David D; Foster, Jeffrey G; Frick, Louise R; Hoatson, Dean M.; Purvis, Alan

doi:10.1080/08120099808728386

Cited by 53 publications

(23 citation statements)

References 79 publications

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“…Contrary to the interpretations of Foster et al (1996) and Lambert et al (1998aLambert et al ( , b, 1999b, the Os isotopic signatures of Kambalda ores do not preclude a ground-melting model. Osmium is simply not abundant enough in the sediment for contamination to be resolvable except at extremely low mass-fractions of silicate magma, especially when one includes the olivine, xenomelts, and residues that also must have been present.…”

Section: Implications For the Genesis Of Ni-cu-(pge) Depositscontrasting

confidence: 75%

“…Foster et al (1996) and Lambert et al (1998aLambert et al ( , b, 1999b argued that S may have been mobile, which might explain why the S isotopic compositions of the ores are similar to those of the metasediments. There is evidence of S addition in some ores, but no evidence that the majority of the ores have had their S isotopic compositions reset (Seccombe et al 1981).…”

Section: Implications For the Genesis Of Ni-cu-(pge) Depositsmentioning

confidence: 98%

“…It may be applied to an initial system, for example using the composition of a parental magma, or it may be applied to a derivative system, for example using the composition of a derivative magma at the point of sulfide saturation if that is known (see discussion by Lesher & Campbell 1993, Lambert et al 1998a. The only provision is that the elemental abundances, partition coefficients, and mass proportions must be appropriate for the specified system.…”

Section: Metal Partitioningmentioning

confidence: 99%

“…Foster et al (1996) and Lambert et al (1998aLambert et al ( , b, 1999b also argued that there is insufficient S in the sediments, with reference to an argument by Gresham (1986). However, that interpretation was based on the interpretation that the ores and komatiites were erupted from feeder fissures beneath the ore zones, an interpretation that has subsequently been superseded by the interpretation that they formed in distal lava channels (Lesher et al 1984).…”

Section: Implications For the Genesis Of Ni-cu-(pge) Depositsmentioning

confidence: 99%

“…These equations have been widely used in the literature to model variations in the compositions of sulfide ores in systems with variable R (e.g., , Barnes & Picard 1993, Lesher & Campbell 1993, Lambert et al 1998a, Maier et al 1998, Ripley et al 1999, Barnes 1999). However, as we shall see, Equation 2 is only applicable in special cases, and not all ore-forming systems meet the restrictions.…”

Section: Introductionmentioning

confidence: 99%

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MULTICOMPONENT ELEMENTAL AND ISOTOPIC MIXING IN Ni Cu (PGE) ORES AT KAMBALDA, WESTERN AUSTRALIA

Lesher

Burnham

2001

The Canadian Mineralogist

126

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Most magmatic Ni-Cu-(PGE) deposits are considered to have formed from sulfide-undersaturated silicate magmas and to contain a significant component of crustal sulfur that was derived via wholesale melting, partial melting, or devolatilization of wall rocks. Under such circumstances, the system may comprise a silicate magma and a sulfide magma, with or without crystalline solids, undissolved wallrock-derived xenoliths, an unmixed silicate xenomelt, or an undissolved xenovolatile phase, each of which may contain distinct chalcophile and lithophile components. Because traditional two-component (silicate magma -sulfide magma) mass-balance models do not accurately model such systems, we have developed a series of multicomponent elemental and isotopic mass-balance equations to model batch equilibration in magmatic Ni-Cu-(PGE) systems. We have applied them to the type examples of komatiite-associated Ni-Cu-(PGE) deposits at Kambalda, Western Australia. The calculations indicate that the elemental and isotopic compositions of the various components in a multicomponent system will vary considerably as a function of the relative abundances of the components, and that different metals and isotopic systems may decouple from each other, yielding apparently conflicting information regarding the sources of the components. The results suggest that the S isotopic and Zn compositions of the ores are more sensitive indicators of contamination than the Os isotopes, and support a sedimentmelting model for Kambalda.

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Section: Implications For the Genesis Of Ni-cu-(pge) Depositscontrasting

confidence: 75%

Section: Implications For the Genesis Of Ni-cu-(pge) Depositsmentioning

confidence: 98%

Section: Metal Partitioningmentioning

confidence: 99%

Section: Implications For the Genesis Of Ni-cu-(pge) Depositsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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MULTICOMPONENT ELEMENTAL AND ISOTOPIC MIXING IN Ni Cu (PGE) ORES AT KAMBALDA, WESTERN AUSTRALIA

Lesher

Burnham

2001

The Canadian Mineralogist

126

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The 187Re-187Os and 190Pt-186Os Radiogenic Isotope Systems: Techniques and Applications to Metallogenic Systems

Norman

2023

Mineral Resource Reviews

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Rhenium, Os, and Pt are redox sensitive elements that are concentrated in highly reducing environments such as those associated with black shales but mobile under more oxidizing conditions such as those associated with arc volcanism. They are chalcophile in many terrestrial ore-forming environments, and their isotopic systematics provide unique opportunities to date the formation of sulfide ore deposits and understand their petrogenesis. Fractional crystallization of magmatic sulfide ores generates primary variations in Re/Os and Pt/Os that allow mineral and whole rock isochron ages to be determined and discrimination of crustal and mantle sources based on initial Os isotopic compositions. Molybdenite is especially well suited for geochronology due to its high Re/Os and resistance to resetting. Rhenium concentrations in molybdenite tend to reflect the composition or provenance of the ore-forming fluids, with higher concentrations associated with more primitive sources or more oxidized fluids and lower concentrations with more evolved and/or reduced conditions, although local and regional factors also have a significant influence. Many studies have used pyrite for dating but its typically low Re concentration, variable initial Os isotopic composition (reflecting fluid mxing), and susceptibility to re-equilibration makes its use as a geochronometer problematic in many cases. Other sulfide minerals such as bornite and arsenopyrite have shown promise for Re–Os isotope geochronology but additional studies are needed to evaluate their broader applicability for dating of ore deposits. The isobaric beta decay of parent isotope 187Re to 187Os has restricted investigation of this system by microbeam techniques such as ion microprobe or laser ablation mass spectrometry, especially for geochronology. This requires either chemically processing the sample to separate the elements or novel techniques such as collision-cells that preferentially ionize the Re and Os during the analysis. Thermal ionization mass spectrometry (TIMS) and inductively-coupled plasma mass spectrometry (ICPMS) are the most widely applied techniques for Re-Pt-Os isotopic analyses. Specialized techniques for sample digestion to ensure redox equilibrium between Os in the sample and the isotopically enriched spikes used for isotope dilution measurements are typically required. This chapter briefly reviews development of the 187Re-187Os and 190Pt-186Os isotopic systems for earth science, physico-chemical controls on their behavior in ore-forming environments, and applications to metallogenic systems.

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Re–Os isotope systematics for the Lince–Estefanía deposit: constraints on the timing and source of copper mineralization in a stratabound copper deposit, Coastal Cordillera of Northern Chile

et al. 2006

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Application of the Re‐Os isotopic system to the study of Precambrian magmatic sulfide deposits of Western Australia

Cited by 53 publications

References 79 publications

MULTICOMPONENT ELEMENTAL AND ISOTOPIC MIXING IN Ni Cu (PGE) ORES AT KAMBALDA, WESTERN AUSTRALIA

MULTICOMPONENT ELEMENTAL AND ISOTOPIC MIXING IN Ni Cu (PGE) ORES AT KAMBALDA, WESTERN AUSTRALIA

The 187Re-187Os and 190Pt-186Os Radiogenic Isotope Systems: Techniques and Applications to Metallogenic Systems

Re–Os isotope systematics for the Lince–Estefanía deposit: constraints on the timing and source of copper mineralization in a stratabound copper deposit, Coastal Cordillera of Northern Chile

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