Sn-isotope fractionation as a record of hydrothermal redox reactions

Junming Yao, Ryan Mathur, Wayne Powell, Bernd Lehmann, Fernando Tornos, Marc Wilson, Joaquin Ruiz

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A redox reaction in which Sn2+ oxidizes to Sn4+ is thought to occur during the precipitation of cassiterite (SnO2) and stannite (Cu2FeSnS4) from high-temperature hydrothermal solutions. In four stanniferous regions with differing mineralization environments (South Dakota, U.S.A.; Cornwall, England; Erzgebirge, Germany/Czech Republic; Andean tin belt, Bolivia), the tin isotope composition in stannite (mean value δ124Sn = -1.47 ± 0.54‰, n = 21) is consistently more fractionated toward negative values than that of paragenetically earlier cassiterite (mean value δ124Sn = 0.48 ± 0.62‰, n = 50). Given the oxidation-dependent mechanism for cassiterite precipitation, this isotopic shift is most likely attributable to the oxidation of Sn in solution; precipitation of heavy-Sn-enriched cassiterite results in residual dissolved Sn with lighter isotopic composition, which is expressed in the negative δ124Sn values of later-formed stannite. Equally important is that the mean values for the cassiterite from the various deposits are slightly different and may indicate that the initial Sn isotope composition in early-formed cassiterite relates to variations in the source or magmatic processes. Therefore, the Sn isotopes may provide information on both redox reactions and petrologic sources and processes.

Original languageEnglish (US)
Pages (from-to)1591-1598
Number of pages8
JournalAmerican Mineralogist
Volume103
Issue number10
DOIs
StatePublished - Oct 25 2018

Fingerprint

cassiterite
Redox reactions
Fractionation
fractionation
Isotopes
Tin
isotopes
isotope
Chemical analysis
tin isotopes
Bolivia
Oxidation
Czech Republic
England
oxidation
tin
Germany
Deposits
deposits
shift

Keywords

  • cassiterite
  • metal isotope fractionation
  • redox
  • stannite
  • Tin isotopes

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Cite this

Yao, J., Mathur, R., Powell, W., Lehmann, B., Tornos, F., Wilson, M., & Ruiz, J. (2018). Sn-isotope fractionation as a record of hydrothermal redox reactions. American Mineralogist, 103(10), 1591-1598. https://doi.org/10.2138/am-2018-6524

Sn-isotope fractionation as a record of hydrothermal redox reactions. / Yao, Junming; Mathur, Ryan; Powell, Wayne; Lehmann, Bernd; Tornos, Fernando; Wilson, Marc; Ruiz, Joaquin.

In: American Mineralogist, Vol. 103, No. 10, 25.10.2018, p. 1591-1598.

Research output: Contribution to journalArticle

Yao, J, Mathur, R, Powell, W, Lehmann, B, Tornos, F, Wilson, M & Ruiz, J 2018, 'Sn-isotope fractionation as a record of hydrothermal redox reactions', American Mineralogist, vol. 103, no. 10, pp. 1591-1598. https://doi.org/10.2138/am-2018-6524
Yao J, Mathur R, Powell W, Lehmann B, Tornos F, Wilson M et al. Sn-isotope fractionation as a record of hydrothermal redox reactions. American Mineralogist. 2018 Oct 25;103(10):1591-1598. https://doi.org/10.2138/am-2018-6524
Yao, Junming ; Mathur, Ryan ; Powell, Wayne ; Lehmann, Bernd ; Tornos, Fernando ; Wilson, Marc ; Ruiz, Joaquin. / Sn-isotope fractionation as a record of hydrothermal redox reactions. In: American Mineralogist. 2018 ; Vol. 103, No. 10. pp. 1591-1598.
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