Transport of coexisting Ni-Cu sulfide liquid and silicate melt in partially molten peridotite

Wang, Zhenjiang; Zhang, Jin; Mungall, James E.; Xiao, Xianghui

doi:10.1016/j.epsl.2020.116162

Cited by 17 publications

(23 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The physical mobility of sulfide melts in the lower crust will depend on the droplet size, the permeability of the melt network, and the efficiency of the upward movement 28 , 44 . If both the sulfide droplet size and melt network are too large, the sulfide droplets may sink and coalesce to form sulfide-rich veins of Cu-rich sulfide that remain in the “trap” (e.g., Figs.…”

Section: Discussionmentioning

confidence: 99%

“…This represents an example of a mafic/ultramafic underplating event that occurred in the final stages of the subduction-related Variscan continental collision 15 , 24 . We build on recent studies documenting the metal-transfer mechanisms across the lithosphere 11 , 25 – 28 along with numerical modeling of the evolution of the Ivrea Zone 29 to propose that the observed relationships provide evidence that the “sulfide trap” may in fact act as a gateway, episodically permitting or preventing preferential migration of Cu-Au-rich sulfide melts upwards.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mobilisation of deep crustal sulfide melts as a first order control on upper lithospheric metallogeny

et al. 2022

View full text Add to dashboard Cite

Magmatic arcs are terrestrial environments where lithospheric cycling and recycling of metals and volatiles is enhanced. However, the first-order mechanism permitting the episodic fluxing of these elements from the mantle through to the outer Earth’s spheres has been elusive. To address this knowledge gap, we focus on the textural and minero-chemical characteristics of metal-rich magmatic sulfides hosted in amphibole-olivine-pyroxene cumulates in the lowermost crust. We show that in cumulates that were subject to increasing temperature due to prolonged mafic magmatism, which only occurs episodically during the complex evolution of any magmatic arc, Cu-Au-rich sulfide can exist as liquid while Ni-Fe rich sulfide occurs as a solid phase. This scenario occurs within a ‘Goldilocks’ temperature zone at ~1100–1200 °C, typical of the base of the crust in arcs, which permits episodic fractionation and mobilisation of Cu-Au-rich sulfide liquid into permeable melt networks that may ascend through the lithosphere providing metals for porphyry and epithermal ore deposits.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mobilisation of deep crustal sulfide melts as a first order control on upper lithospheric metallogeny

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The remaining fraction, ~90% of bulk S, would be featured within residual lithologies, as trapped molten BMS, as widely documented by peridotitic lithologies (Holzheid and Groves, 2002 ;Aulbach et al, 2009 ;Lorand and Luguet, 2016 and references therein). Wang et al (2020) recently modelled the interaction between silicate melt and sulfide melt during extraction of partial melts from peridotite matrix. They showed that, under hydrostatic conditions and in the presence of low to moderate amount of silicate melt, this latter may impede the mechanical extraction of sulfide liquid through the porous flow of silicate melt due to the larger excess pressure imposed by the capillary force, low flow rates of silicate melt generating a higher percolation threshold for sulphides (5 vol.%).…”

Section: Proterozoïc Partial Melting and Mobilisation Of C And S From...mentioning

confidence: 99%

Sulphide Petrology and Contribution of Subducted Sulphur in Diamondiferous Garnet-Bearing Pyroxenites from Beni Bousera (Northern Morocco)

Lorand

Pont

Labidi

et al. 2021

Journal of Petrology

View full text Add to dashboard Cite

This paper explores the unusual sulphide-graphite association of a selection of Beni Bousera garnet clinopyroxenites that initially equilibrated within the diamond stability field. Compared to common graphite-free garnet pyroxenites analysed so far, these rocks display tenfold S enrichment with concentrations up to 5550 μg/g. Fe-Ni-Cu sulphides (up to 1.5 wt.%) consist of large (up to 3 mm across), low-Ni pyrrrhotite (<0.1 wt.% Ni) of troilite composition, along with volumetrically minor chalcopyrite and pentlandite. Such assemblages are interpreted as low-temperature (<100°C) subsolidus exsolution products from homogeneous monosulphide solid solution. Troilite compositions of the pyrrhotite indicate strongly reducing conditions that are estimated to be slightly above the iron-wüstite (IW) buffer. Bulk-sulphide compositions are closer to the FeS end-member (i.e., Cu- and Ni-depleted) than other sulphide occurrences in mantle-derived pyroxenites described so far. Moreover, troilite contains trace metal microphases (Pb and Ag tellurides, molybdenite) that has never been reported before from mantle-derived garnet pyroxenites but in diamond-hosted eclogitic sulphide inclusions. Beni Bousera sulphides also show strong similarities with diamond-hosted sulphide inclusions of eclogitic affinity for a wide range of chalcophile-siderophile trace element contents. In view of the widespread molybdenite exsolution, coupled with Mo and S/Se/Te systematics of sulphide compositions (7,872<S/Se<19,776 ; 15<Se/Te<31), black-shale pyrite is a potential sedimentary component to contribute to the petrogenesis of Beni Bousera garnet clinopyroxenites. Black shales would have recycled along with cumulates from the oceanic crust in the mantle source of Beni Bousera pyroxenites. Pyrite underwent desulfidation and replacement by troïlite during subduction and prograde metamorphism, releasing its fluid mobile elements (As, Sb, Pb) while suffering minimum S loss because of the strongly reduced conditions. Taken as a whole, our body of data supports a common origin for carbon (-27‰<δ13C<-17‰) and sulphur and concomitant formation of diamond and sulphides. Both elements were delivered by an extraneous sedimentary component mixed with the altered oceanic crust rocks that was involved in the genesis of Beni Bousera garnet pyroxenites, prior to a Proterozoic partial melting event.

show abstract

“…When the phase transition of the matter occurs, the relationship between the temperature and the pressure is called the phase transition equation. The phase transition reactions used for the pressure calibration at high temperatures include quartz-coesite, coesite-stishovite, α fayalite -γ fayalite, α forsterite-β forsterite, β forsterite-γ forsterite, and zinc pyroxene-zinc pyroxene in the Perovskite structure (Lebron, et al, 2009;Wang et al, 2010;Chen, et al, 2016;Wang, et al, 2019). The relationship between the temperature and the pressure when a metal, alloy, or chlorinated salt is fused at high pressure is called the fusion equation.…”

Section: Introductionmentioning

confidence: 99%

Pressure Calibration of Large-Volume Press: A Case Study of Hinged 6-8 Type Large-Volume High-Pressure Apparatus

Ren

2022

Front. Earth Sci.

View full text Add to dashboard Cite

In this study, methods for the pressure calibration of 6–8 static high-pressure apparatus were investigated. The relationship between the pressure of DS 6 × 1,400 t pressing oil and the chamber pressure was calibrated using water, ZnTe, ZnS, and GaAs at room temperature. Also, the relationship between the pressure of the DS 6 × 1,400 t pressing oil and the chamber pressure was calibrated by the phase transition experiments using KCl, LiCl, KCl + LiCl, and quartz-coesite at high temperatures. We found a linear relationship between the chamber pressure and the oil pressure at room temperature. However, when the temperature and pressure increased to certain values, the chamber pressure and the oil pressure deviated from the linear relationship.

show abstract

Transport of coexisting Ni-Cu sulfide liquid and silicate melt in partially molten peridotite

Cited by 17 publications

References 49 publications

Mobilisation of deep crustal sulfide melts as a first order control on upper lithospheric metallogeny

Mobilisation of deep crustal sulfide melts as a first order control on upper lithospheric metallogeny

Sulphide Petrology and Contribution of Subducted Sulphur in Diamondiferous Garnet-Bearing Pyroxenites from Beni Bousera (Northern Morocco)

Pressure Calibration of Large-Volume Press: A Case Study of Hinged 6-8 Type Large-Volume High-Pressure Apparatus

Contact Info

Product

Resources

About