View in EDS

The composition of sphalerite and associated sulfides in reactions of the Cu–Fe–Zn–S, Fe–Zn–S and Cu–Fe–S systems at 1 bar and temperatures between 250 and 535 °C

Saved in:
Bibliographic Details
Title: The composition of sphalerite and associated sulfides in reactions of the Cu–Fe–Zn–S, Fe–Zn–S and Cu–Fe–S systems at 1 bar and temperatures between 250 and 535 °C
Authors: Lusk, John1, Calder, Brian O.E. bscalder@optusnet.com.au
Source: Chemical Geology. Feb2004, Vol. 203 Issue 3/4, p319. 27p.
Subjects: Sphalerite, Sulfur, Fused salts, Temperature
Abstract: Sphalerites and sulfides in selected reaction assemblages of the Cu–Fe–Zn–S, Cu–Fe–S, and Fe–Zn–S systems were crystallized in molten salt fluxes contained in evacuated capsules at temperatures between ∼250 and ∼535 °C. The combined compositional data for sphalerite indicate large increases in the mol% FeS content and the Fe/Cu ratio with decreasing sulfur fugacity at given temperatures. Pyrite and the associated copper-iron sulfides show parallel increases for Cu/Fe ratios in the Cu–Fe–S system, and increases for Fe/Cu and Fe/Zn ratios in the Cu–Fe–Zn–S system. These compositional changes occur over a range of sulfur fugacity–temperature conditions that include many sulfide deposits.A log fS2–temperature (1000/K) composition map has been constructed for sphalerite using Lusk and Bray''s (2002) data for a sequence of buffer reactions in the Cu–Fe–S and Fe–S systems. Accordingly, sphalerites with mean mol% FeS compositions of ∼1.7 (i.e. for the reaction: pyrite+idaite=bornite+S (vapor)), ∼4.4 (i.e. pyrite+bornite=chalcopyrite+S), ∼14.4 (i.e. pyrite+chalcopyrite=cubanite (iss)+S), 22.9 (i.e. pyrite+cubanite (iss)=pyrrhotite+cubanite (iss)+S), and ∼21.5 (i.e. pyrite=pyrrhotite+S) were obtained. A slight increase in the mol% FeS content of sphalerite with decreasing temperature was obtained for the pyrite=pyrrhotite+S buffer reaction at temperatures below ∼550 °C. The copper contents of sphalerite are generally low, ranging between ∼3 and ∼0.5 mol% CuS, and are highest in sphalerites associated with bornites.The equation: log10fS2=11.01−9.49 (1000/K)+[0.187−0.252 (1000/K)] (mol% FeS)+[0.35−0.2 (1000/K)] (mol% CuS in sphalerite) can be applied to sphalerites that have equilibrated with buffer assemblages containing pyrite, or pyrite and pyrrhotite, in both the Fe–Zn–S and Cu–Fe–Zn–S systems at temperatures (K is in Kelvin) between 250 and 550 °C at 1 bar. This equation incorporates present data and a selection of published experimental data that is fitted to within 10%. [Copyright &y& Elsevier]
Copyright of Chemical Geology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 12169791
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: The composition of sphalerite and associated sulfides in reactions of the Cu–Fe–Zn–S, Fe–Zn–S and Cu–Fe–S systems at 1 bar and temperatures between 250 and 535 °C
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Lusk%2C+John%22">Lusk, John</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Calder%2C+Brian+O%2EE%2E%22">Calder, Brian O.E.</searchLink><i> bscalder@optusnet.com.au</i>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Chemical+Geology%22">Chemical Geology</searchLink>. Feb2004, Vol. 203 Issue 3/4, p319. 27p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Sphalerite%22">Sphalerite</searchLink><br /><searchLink fieldCode="DE" term="%22Sulfur%22">Sulfur</searchLink><br /><searchLink fieldCode="DE" term="%22Fused+salts%22">Fused salts</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature%22">Temperature</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Sphalerites and sulfides in selected reaction assemblages of the Cu–Fe–Zn–S, Cu–Fe–S, and Fe–Zn–S systems were crystallized in molten salt fluxes contained in evacuated capsules at temperatures between ∼250 and ∼535 °C. The combined compositional data for sphalerite indicate large increases in the mol% FeS content and the Fe/Cu ratio with decreasing sulfur fugacity at given temperatures. Pyrite and the associated copper-iron sulfides show parallel increases for Cu/Fe ratios in the Cu–Fe–S system, and increases for Fe/Cu and Fe/Zn ratios in the Cu–Fe–Zn–S system. These compositional changes occur over a range of sulfur fugacity–temperature conditions that include many sulfide deposits.A log fS2–temperature (1000/K) composition map has been constructed for sphalerite using Lusk and Bray''s (2002) data for a sequence of buffer reactions in the Cu–Fe–S and Fe–S systems. Accordingly, sphalerites with mean mol% FeS compositions of ∼1.7 (i.e. for the reaction: pyrite+idaite=bornite+S (vapor)), ∼4.4 (i.e. pyrite+bornite=chalcopyrite+S), ∼14.4 (i.e. pyrite+chalcopyrite=cubanite (iss)+S), 22.9 (i.e. pyrite+cubanite (iss)=pyrrhotite+cubanite (iss)+S), and ∼21.5 (i.e. pyrite=pyrrhotite+S) were obtained. A slight increase in the mol% FeS content of sphalerite with decreasing temperature was obtained for the pyrite=pyrrhotite+S buffer reaction at temperatures below ∼550 °C. The copper contents of sphalerite are generally low, ranging between ∼3 and ∼0.5 mol% CuS, and are highest in sphalerites associated with bornites.The equation: log10fS2=11.01−9.49 (1000/K)+[0.187−0.252 (1000/K)] (mol% FeS)+[0.35−0.2 (1000/K)] (mol% CuS in sphalerite) can be applied to sphalerites that have equilibrated with buffer assemblages containing pyrite, or pyrite and pyrrhotite, in both the Fe–Zn–S and Cu–Fe–Zn–S systems at temperatures (K is in Kelvin) between 250 and 550 °C at 1 bar. This equation incorporates present data and a selection of published experimental data that is fitted to within 10%. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Chemical Geology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=12169791
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.chemgeo.2003.10.011
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 27
        StartPage: 319
    Subjects:
      – SubjectFull: Sphalerite
        Type: general
      – SubjectFull: Sulfur
        Type: general
      – SubjectFull: Fused salts
        Type: general
      – SubjectFull: Temperature
        Type: general
    Titles:
      – TitleFull: The composition of sphalerite and associated sulfides in reactions of the Cu–Fe–Zn–S, Fe–Zn–S and Cu–Fe–S systems at 1 bar and temperatures between 250 and 535 °C
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Lusk, John
      – PersonEntity:
          Name:
            NameFull: Calder, Brian O.E.
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 16
              M: 02
              Text: Feb2004
              Type: published
              Y: 2004
          Identifiers:
            – Type: issn-print
              Value: 00092541
          Numbering:
            – Type: volume
              Value: 203
            – Type: issue
              Value: 3/4
          Titles:
            – TitleFull: Chemical Geology
              Type: main
ResultId 1