Sulfide formation as a result of sulfate subduction into silicate mantle (Experimental modeling under high p,t-parameters)

Yuliya Bataleva, Yuri Palyanov, Yuri Borzdov

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Ca,Mg-sulfates are subduction-related sources of oxidized S-rich fluid under lithospheric mantle P,T-parameters. Experimental study, aimed at the modeling of scenarios of S-rich fluid generation as a result of desulfation and subsequent sulfide formation, was performed using a multi-anvil high-pressure apparatus. Experiments were carried out in the Fe,Ni-olivine–anhydrite–C and Fe,Ni-olivine–Mg-sulfate–C systems (P = 6.3 GPa, T of 1050 and 1450C, t = 23–60 h). At 1050C, the interaction in the olivine–anhydrite–C system leads to the formation of olivine + diopside + pyrrhotite assemblage and at 1450C leads to the generation of immiscible silicate-oxide and sulfide melts. Desulfation of this system results in the formation of S-rich reduced fluid via the reaction olivine + anhydrite + C → diopside + S0 + CO2. This fluid is found to be a medium for the recrystallization of olivine, extraction of Fe and Ni, and subsequent crystallization of Fe,Ni-sulfides (i.e., olivine sulfidation). At 1450C in the Ca-free system, the generation of carbonate-silicate and Fe,Ni-sulfide melts occurs. Formation of the carbonate component of the melt occurs via the reaction Mg-sulfate + C → magnesite + S0. It is experimentally shown that the olivine-sulfate interaction can result in mantle sulfide formation and generation of potential mantle metasomatic agents—S-and CO2-dominated fluids, silicate-oxide melt, or carbonate-silicate melt.

Original languageEnglish
Article number373
Number of pages15
JournalMinerals
Volume8
Issue number9
DOIs
Publication statusPublished - 1 Sep 2018

Keywords

  • Desulfation
  • High-pressure experiment
  • Lithospheric mantle
  • Mantle metasomatism
  • S-rich fluid
  • Subduction
  • Sulfate
  • Sulfidation
  • Sulfide
  • sulfate
  • mantle metasomatism
  • lithospheric mantle
  • high-pressure experiment
  • SULFUR
  • desulfation
  • REDOX BUDGET
  • ELEMENTS
  • DIAMOND FORMATION
  • GEOCHEMISTRY
  • sulfidation
  • HIGH-PRESSURE
  • CARBON
  • XENOLITHS
  • subduction
  • REDUCED S
  • CARBIDE
  • sulfide

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