Sulfide paragenesis and sulfur mobility in Fe-Ni-Cu sulfide ores at Lunnon and Juan Main shoots, Kambalda; textural and sulfur isotopic evidence

Seccombe, P. K.; Groves, David; Marston, R. J.; Barrett, F. M.

doi:10.2113/gsecongeo.76.6.1675

Cited by 29 publications

(8 citation statements)

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“…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: 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

131

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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) Depositsmentioning

confidence: 99%

“…The S isotopic data and S/Se values are from Donnelly et al (1978), Groves et al (1979), and Seccombe et al (1981). The Os isotopic data are taken from Foster et al (1996).…”

Section: Isotopic Variations At Kambaldamentioning

confidence: 99%

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

Lesher

Burnham

2001

The Canadian Mineralogist

131

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“…Data from Naldrett (1966). Seccombe et al (1978Seccombe et al ( , 1981, and Green and Naldrett (1981 (Ross and Keays 1979, Marston and Kay 1980. The limited range of parental liquid compositions for the host units (generally 28 -32070 MgO) indicates that this cannot be attributed to variations in the compositions of the precursor magmas.…”

Section: Thermodynamic Constraintsmentioning

confidence: 99%

Controls on the Formation of Komatiite-Associated Nickel-Copper Sulfide Deposits

Lesher

Groves

1986

Special Publication No. 4 of the Society for Geology Applied to Mineral Deposits

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Nickel-copper sulfide deposits associated with rocks of komatiitic affinity may be divided into two associations on the basis of host rock composition and ore distribution: (1) stratiform, massive-matrix-disseminated sulfides hosted by cumulate komatiite lava flows (lava conduits), or strata-bound, coarse disseminated sulfides hosted by cumulate komatiite bodies near volcanic vents, and (2) strata-bound, finely disseminated sulfides and more restricted massive sulfides hosted by subvolcanic komatiitic dunites (high-level magma chambers). These deposits represent a continuum in environments of emplacement from distal volcanic through proximal and central volcanic to subvolcanic.Field relationships and geochemical data suggest that the sulfides in these deposits are magmatic in origin. Previous models for their formation involve derivation of sulfides directly from the mantle or from low-level magma chambers, but there are several field, physical, and thermodynamic constraints which suggest that this may not be feasible: (1) the spatial concentration of mineralization within certain parts of otherwise virtually barren host units suggests that the latter were not uniformly saturated in sulfide at the time of emplacement; (2) there are physical problems in transporting dense sulfides in low viscosity komatiite magmas, although dispersed sulfide droplets may be supported during rapid ascent; and (3) high temperature komatiitic melts generated by high-degree partial melting, or sequential melting, of mantle source rocks are unlikely to be sulfide-saturated in the source region or to remain sulfide-saturated during adiabatic ascent. These deposits are, however, commonly associated with specific country rocks, particularly sulfidic sediments, and the distribution of the ores appears to be related to the distribution of these rocks. It is most likely that the sulfide ores exsolved from the komatiitic magmas in situ, in response to assimilation of the country rocks during emplacement. The distribution and texture of the mineralization was probably influenced by (1) the mode of emplacement (volcanic vs subvolcanic) and amount of assimilation; (2) the relative volume of magma (lava conduit vs magma chamber) and its capacity to dissolve sulfur; and (3) the timing of sulfide separation and opportunity for segregation. A fundamental aspect of this model is the coincidence of cumulate komatiitic host units (representing dynamic lava conduits and magma chambers) and siliceous, sulfidic, or ferric iron oxide-rich sediments, the former representing a source of heat for assimilation and of ore metals, and the latter a source of sulfur or of components to induce sulfide separation. Mineralized greenstones appear to have formed in deeper water under conditions of greater extension than unmineralized greenstones; rifting environments represent the most favorable tectonic environment for voluminous komatiite eruption/irruption and for accumulation of sulfidic sediments. Variations in the degree of extension along or within the r...

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“…The Ni 2+ commonly display preference in the M1 site of olivine, and the serpentinized olivine is proposed as the source of nickel (Brown, 1980;Filippidis and Annersten, 1981;Annersten et al, 1982;Filippidis, 1982Filippidis, , 1985Filippidis, , 1991Nord et al, 1982;Deer et al, 1997), whereas, the origin of the sulfur is attributed to the fluid phase that causes the serpentinization. The sulfur either exists in the fluid phase, or comes from sources outside of the ultramafic body and transferred by the fluid phase along with Η2Ο, CO2 and Cl (Ashley, 1973;Groves and Keays, 1979;Donaldson, 1981;Donaldson and Bromley, 1981;Seccombe et al, 1981;Pasteris, 1984).…”

Section: Introductionmentioning

confidence: 99%

“…The "internal" sulfur, which originates from magmatic sulphides, immigrates during serpentinization (Shima and Naldrett, 1975;Donaldson, 1981;Seccombe et al, 1981). Sulfur can occur under reducing conditions from these magmatic sulphides (e.g., pentlandite, pyrrhotite) with the process of desulfurization, producing H2S, sulphides and alloys at temperatures of 365-445 o C. The produced H2S, reacts with the metallic elements that are released during the serpentinization of the silicate minerals and Ni-Fe-sulphides are produced.…”

Section: Introductionmentioning

confidence: 99%

Mineral Chemistry and Formation of Awaruite and Heazlewoodite in the Xerolivado Chrome Mine, Vourinos, Greece

Tzamos¹,

Filippidis²,

Michailidis³

et al. 2017

geosociety

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The Serpentinite between the chromite bodies 4 and 5 of Xerolivado mine (Vourinos, Greece), contains sparsely very small grains (<20μm) of awaruite (Fe0.91Cu0.06Co0.03Ni3), heazlewoodite (Ni2.91Fe0.06S2),. The olivine contains 0.40 wt% NiO and 6.91 (Fe0,91Cu0,06Co0,03Ni3), χεζλεγουδίτη (Ni2,91Fe0,06S2), μαγνητίτη και 79Fe2,98Co2,38S8 Περίληψη Ο σερπεντινίτης μεταξύ των χρωμιτικών σωμάτων 4 και 5 στο μεταλλείο Ξερολίβαδο (Βούρινος, Ελλάδα) περιέχει σποραδικούς πολύ μικρούς κόκκους (<20μm) αβαρουίτη

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Sulfide paragenesis and sulfur mobility in Fe-Ni-Cu sulfide ores at Lunnon and Juan Main shoots, Kambalda; textural and sulfur isotopic evidence

Cited by 29 publications

References 0 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

Controls on the Formation of Komatiite-Associated Nickel-Copper Sulfide Deposits

Mineral Chemistry and Formation of Awaruite and Heazlewoodite in the Xerolivado Chrome Mine, Vourinos, Greece

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