Geochemistry and Origin of the Intrusive Hosts of the Noril'sk-Talnakh Cu-Ni-PGE Sulfide Deposits

Arndt, N. T.

doi:10.2113/98.3.495

Cited by 47 publications

(61 citation statements)

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“…This sample contains 11.4 wt.% MgO and its overall composition is similar to that estimated by Arndt et al (2003) of probable parental magmas of the ore-bearing intrusions. The rock was powdered and melted at 1600 °C and atmospheric pressure for 2 hours, in order to obtain a homogeneous, volatile-free glass (composition in Table 1).…”

Section: Experimental Strategysupporting

confidence: 66%

“…This strong enrichment in sulfur of Noril'sk-Talnakh magmatic systems led several authors (e.g. Naldrett et al 1992Naldrett et al , 1996Arndt et al 2003Arndt et al , 2005Li et al 2003Li et al , 2009Naldrett 2004) to propose a contribution from sulfate-bearing host rocks, which are extremely common in the sedimentary sequence (Fig. 1c).…”

Section: Introductionmentioning

confidence: 94%

“…Arndt et al 2003;Li et al 2003Li et al , 2009aNaldrett 2004). The 87 Sr/ 86 Sr ratio of the intrusive rocks has also been considered to be evidence for evaporite contamination (Arndt et al 2003). Assimilation of organic matter is needed to trigger sulfide saturation, which would be otherwise prevented by the oxidation of the melt during evaporite assimilation.…”

Section: Application To Noril'skmentioning

confidence: 99%

“…The intrusions were emplaced at shallow depths and are considered as sub-volcanic, or even as magma conduits to the overlying volcanism (e.g. Czamanske et al 1995;Naldrett et al 1996;Arndt et al 2003;Naldrett 2004). Intrusions containing massive sulfide ore bodies are ribbon shaped and hosted in Lower Devonian to Upper Permian sedimentary rocks (Fig.1b, c): the Noril'sk 1 intrusion is emplaced in the Carboniferous-Permian Tungusskaya Series and in the overlying volcanic sequence (Fig.1c); the Talnakh intrusion in the Tungusskaya Series and the upper Devonian Kalargonsky formation (constituted of dolomites, limestones and dolomitic marls; 1994b;Czamanske et al 1995;Naldrett 2004;Sluzhenikin et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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Assimilation of sulfate and carbonaceous rocks: Experimental study, thermodynamic modeling and application to the Noril’sk-Talnakh region (Russia)

Iacono-Marziano

Ferraina

Gaillard

et al. 2017

Ore Geology Reviews

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. sulfate and organic matter-rich sedimentary rocks has been proposed as a possible mechanism for the origin of these exceptional sulfide deposits but the interaction process and the reaction paths have never been fully investigated. Here we clarify, by both experimental petrology and thermodynamic modeling, how sulfate and organic matter assimilation occur in mafic-ultramafic magmas, affecting magma composition, crystallization and sulfide saturation.Interaction experiments were conducted at conditions relevant to the emplacement of Noril'sk type intrusions (1200 °C, ~80 MPa) to simulate the assimilation of sulfate and/or organic compounds by ultramafic magmas. We used a picrite from Noril'sk1 intrusion, and coal and anhydrite from the area as starting materials. The experimental results show that the incorporation of anhydrite into the magma occurs by chemical dissolution in the melt, which increases the magma's sulfur content, but suppresses sulfide saturation and reduces olivine crystallization. Extreme assimilation leads to sulfate saturation in the magma and high dissolved sulfur contents of 0.9±0.1 wt.% S. Conversely, coal assimilation promotes sulfide segregation and magma crystallization, while decreasing the dissolved H 2 O content of the melt and increasing the amount of coexisting fluid phase.We also employed gas-melt thermodynamic calculations to quantify the effect of these assimilations on the redox conditions and the S content of the magma, and investigate the role of temperature, pressure, and initial gas content of the magma in the assimilation process. We quantify how sulfate assimilation strongly oxidizes the magma and increases its S content; both effects are intensified by 2 increasing pressure (from 50 to 100 MPa in this study), decreasing temperature (from 1350 to 1200 °C in this study), and decreasing amounts of fluid phase initially coexisting with the magma (from 2 to 0 wt.%). The interaction with organic matter (CH in this study) induces a strong reduction of the magma, even for extremely low degrees of assimilation (few tenths of wt. %), and the dehydration of the melt.We therefore suggest that in the Noril'sk-Talnakh district (1) additional S was supplied to mantle derived magmas by the assimilation of evaporitic rocks, and was transported during magma ascent in the form of dissolved, oxidized S; (2) a substantial reduction of the magma inducing sulfide segregation and important crystallization then occurred due to the interaction with carbonaceous sediments. This mechanism can potentially produce massive sulfide deposits by imp...

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Section: Experimental Strategysupporting

confidence: 66%

Section: Introductionmentioning

confidence: 94%

Section: Application To Noril'skmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Assimilation of sulfate and carbonaceous rocks: Experimental study, thermodynamic modeling and application to the Noril’sk-Talnakh region (Russia)

Iacono-Marziano

Ferraina

Gaillard

et al. 2017

Ore Geology Reviews

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“…8, Table 2), also the Noril'sk lavas in general display higher MgO values and are all lowTi basalts. However, in a recent paper Arndt et al (2003) have shown that the relationship between chalcophile element depletion and sill-hosted magmatic sulphide mineralization at Noril'sk is less direct than previously assumed. Magmas of the mineralized sills (Noril'sk-and Talnakh-type intrusions) are neither strongly contaminated nor strongly chalcophile element depleted, but have apparently acquired sulphur from gypsum beds of the sillhosting sedimentary strata.…”

Section: Implications For Ni-cu-(pge) Explorationmentioning

confidence: 84%

Petrogenetic reconnaissance investigation of mafic sills associated with flood basalts, Mekelle basin, northern Ethiopia: implications for Ni–Cu exploration

Küster

Dwivedi

Kabeto

et al. 2005

Journal of Geochemical Exploration

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2011

Economic Geology Principles and Practice

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Geochemistry and Origin of the Intrusive Hosts of the Noril'sk-Talnakh Cu-Ni-PGE Sulfide Deposits

Cited by 47 publications

References 0 publications

Assimilation of sulfate and carbonaceous rocks: Experimental study, thermodynamic modeling and application to the Noril’sk-Talnakh region (Russia)

Assimilation of sulfate and carbonaceous rocks: Experimental study, thermodynamic modeling and application to the Noril’sk-Talnakh region (Russia)

Petrogenetic reconnaissance investigation of mafic sills associated with flood basalts, Mekelle basin, northern Ethiopia: implications for Ni–Cu exploration

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