Sulfur isotopic studies of continental flood basalts in the Noril’sk region: implications for the association between lavas and ore-bearing intrusions

Ripley, Edward M.; Lightfoot, Peter C.; Li, Chusi; Elswick, Erika

doi:10.1016/s0016-7037(03)00102-9

Cited by 128 publications

(54 citation statements)

References 33 publications

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“…9). Ripley et al (2003) have Li et al (2009a) are single spot analyses and may differ slightly from the average analyses reported here. The value for chalcopyrite in sample 58B given in Li et al (2009a) is in error and should be 9.8& as reported above.…”

Section: Elevated D 34 S Values and Sulfur Isotope Variabilitycontrasting

confidence: 65%

“…Degassing of sulfur-bearing magma is a process that can also lead to 34 S-enriched melts (e.g., Ripley et al, 2003;Mandeville et al, 2009). At oxidation states where sulfate is the predominant species in the melt (above $QFM + 2, Carroll and Rutherford, 1988;Wallace and Carmichael, 1994) the sulfur-isotope vapor-melt fractionation factor may be negative.…”

Section: Elevated D 34 S Values and Sulfur Isotope Variabilitymentioning

confidence: 99%

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Micro-scale S isotope studies of the Kharaelakh intrusion, Noril’sk region, Siberia: Constraints on the genesis of coexisting anhydrite and sulfide minerals

Ripley

Moore

et al. 2010

Geochimica et Cosmochimica Acta

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Section: Elevated D 34 S Values and Sulfur Isotope Variabilitycontrasting

confidence: 65%

Section: Elevated D 34 S Values and Sulfur Isotope Variabilitymentioning

confidence: 99%

Micro-scale S isotope studies of the Kharaelakh intrusion, Noril’sk region, Siberia: Constraints on the genesis of coexisting anhydrite and sulfide minerals

Ripley

Moore

et al. 2010

Geochimica et Cosmochimica Acta

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“…Sulfide saturation, and thus ore genesis, in these intrusions occurs late in their crystallization history and is triggered by prolonged fractionation of the magma, rather than the addition of external S via crustal contamination from local S-bearing country rocks, which is common in marginal and basal deposits (e.g., Li et al 2002;Ripley et al 2003;Keays and Lightfoot 2010). Mavrogenes and O'Neill (1999) demonstrated sulfide saturation can happen after more than 60 % fractional crystallization of a basaltic magma.…”

Section: Triggers For Sulfide Saturationmentioning

confidence: 99%

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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“…Noril'sk-Talnakh Region (Ripley et al 2003;Ripley & Li 2013); Duluth (Arcuri et al 1998); Voisey's Bay (Ripley et al 1999); Kambalda (Lesher & Burnham 2001); and others (see Naldrett 2004Naldrett , 2011, and references therein)). A scenario in which crustal sulphur is available for magma contamination is therefore often an important factor in Ni-Cu-PGE exploration.…”

Section: Implications For Ni-cu-pge Orthomagmatic Sulphide Mineralizamentioning

confidence: 99%

Contrasting mechanisms for crustal sulphur contamination of mafic magma: evidence from dyke and sill complexes from the British Palaeogene Igneous Province

Hughes

Boyce

McDonald

et al. 2015

JGS

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The addition of crustal sulphur to magma can trigger sulphide saturation, a process fundamental to the development of some Ni–Cu–PGE deposits. In the British Palaeogene Igneous Province, mafic and ultramafic magmas intrude a thick sedimentary sequence offering opportunities to elucidate mechanisms of magma–crust interaction in a setting with heterogeneous S isotope signatures. We present S-isotopic data from sills and dykes on the Isle of Skye. Sharp contrasts exist between variably light δ 34 S in Jurassic sedimentary sulphide (−35‰ to −10‰) and a local pristine magmatic δ 34 S signature of −2.3 ± 1.5‰. Flat-lying sills have restricted δ 34 S (−5‰ to 0‰) whereas steeply dipping dykes are more variable (−0‰ to −2‰). We suggest that the mechanism by which magma is intruded exerts a fundamental control on the degree of crustal contamination by volatile elements. Turbulent flow within narrow, steep magma conduits, discordant to sediments, and developed by brittle extension or dilation have maximum contamination potential. In contrast, sill-like conduits emplaced concordantly to sediments show little contamination by crustal S. The province is prospective for Ni–Cu–PGE mineralization analogous to the sill-hosted Noril’sk deposit, and Cu/Pd ratios of sills and dykes on Skye indicate that magmas had already reached S-saturation before reaching the present exposure level. Supplementary material: Details of the whole-rock chemical sulphur extraction method; simplified geological maps of the Isle of Skye, a geological cross-section of part of southern Skye, and a stratigraphic log of the Mesoproterozoic and Mesozoic sediments of western Scotland; trace element diagrams of sills and dykes used in this study; and tables for QA/QC of S-isotope results, sample location information, and whole-rock major and trace element results for sill and dyke samples and for Jurassic mudrocks are available at http://www.geolsoc.org.uk/SUP18834 .

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Sulfur isotopic studies of continental flood basalts in the Noril’sk region: implications for the association between lavas and ore-bearing intrusions

Cited by 128 publications

References 33 publications

Micro-scale S isotope studies of the Kharaelakh intrusion, Noril’sk region, Siberia: Constraints on the genesis of coexisting anhydrite and sulfide minerals

Micro-scale S isotope studies of the Kharaelakh intrusion, Noril’sk region, Siberia: Constraints on the genesis of coexisting anhydrite and sulfide minerals

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

Contrasting mechanisms for crustal sulphur contamination of mafic magma: evidence from dyke and sill complexes from the British Palaeogene Igneous Province

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