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Contributions to Mineralogy and Petrology

, Volume 69, Issue 4, pp 397–407 | Cite as

Basaltic glass with high-temperature equilibrated immiscible sulphide bodies with native iron from disko, central West Greenland

  • Asger Ken Pedersen
Article

Abstract

Immiscible sulphide bodies show eutectic quench textures in a basaltic glass rock (mg=66) from a native iron-bearing dyke chilled at T=1,200° C and P=250 bars. The sulphide bodies are composed of troilite (90–91%), iron (9–10%) and very scarce vanadium-rich chromite and approach a ternary cotectic in the Ni-poor part of the system Fe-Ni-S. Transition element partition between olivine (mg=83), silicate glass (mg=59) and sulphide blebs indicate that the phases were equilibrated at 1,200° C. Dvanadium(olivine/glass) is close to unity and reflect the reducing nature of the rock, for which estimates of fO2∼10−12 to −13 and fS2∼10−5 have been made. Dnickel, cobalt, copper (sulphide/glass)=4,300, 230 and 380 respectively, are much higher than reported experimentally determined D's onmonosulphide/basalt glass at the same temperature and show increasing positive deviation (ΔNi>ΔCo>ΔCu) with the increasingly siderophile character of the elements. KDnickel-iron (sulphide/olivine)=63 is much higher than an experimentally reported value (33) and comparison with published thermodynamic data on Ni-partition between olivine and iron metal suggests that the positive deviation is roughly proportional to the excess metal component in the sulphide melt. The occurrence of strongly Ni-depleted reduced basalts on Disko shows that fractionation of metal and sulphides was a common and geologically important process.

Keywords

Sulphide Cobalt Fractionation Olivine Chromite 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1979

Authors and Affiliations

  • Asger Ken Pedersen
    • 1
  1. 1.Geologisk MuseumKøbenhavn K.Denmark

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