Insights into solar nebula formation of pyrrhotite from nanoscale disequilibrium phases produced by H2S sulfidation of Fe metal

Zack Gainsforth, Dante Lauretta, Nobumichi Tamura, Andrew J. Westphal, Christine E. Jilly-Rehak, Anna L. Butterworth

Research output: Contribution to journalArticle

3 Scopus citations


Lauretta (2005) produced sulfide in the laboratory by exposing canonical nebular metal analogs to H2S gas under temperatures and pressures relevant to the formation of the Solar System. The resulting reactions produced a suite of sulfides and nanophase materials not visible at the microprobe scale, but which we have now analyzed by TEM for comparison with interplanetary dust samples and comet Wild 2 samples returned by the Stardust mission. We find the unexpected result that disequilibrium formation favors pyrrhotite over troilite and also produces minority schreibersite, daubréelite, barringerite, taenite, oldhamite, and perryite at the metal-sulfide interface. TEM identification of nanophases and analysis of pyrrhotite superlattice reflections illuminate the formation pathway of disequilibrium sulfide. We discuss the conditions under which such disequilibrium can occur, and implications for formation of sulfide found in extraterrestrial materials.

Original languageEnglish (US)
Pages (from-to)1881-1893
Number of pages13
JournalAmerican Mineralogist
Issue number9
Publication statusPublished - Sep 1 2017



  • comet
  • HS
  • planetary science
  • Pyrrhotite
  • sulfide
  • TEM
  • troilite
  • XRD

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Cite this