The origin of sulfide-rimmed metal grains in ordinary chondrites

Dante Lauretta, Katharina Lodders, Bruce Fegley, Daniel T. Kremser

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

We report results from an experimental study of sulfide chemistry during metamorphism on ordinary chondrite parent bodies. Artificial LL-chondrite material, composed of silicate, iron metal, and sulfide grains, was placed in sealed, evacuated silica tubes and heated to either 500°C or 900°C. These temperatures are representative peak metamorphic temperatures experienced by type 3 and type 6 ordinary chondrites, respectively. Rapid sulfur mobilization occurs during heating and results in the formation of sulfide rims around the metal grains and sulfur loss from the original sulfide crystals. The newly formed sulfide rims have two distinct layers that incorporate nearby silicate grains. We also observe narrow sulfide trails that follow silicate grain boundaries and connect separate sulfide-rimmed metal grains. The morphologies of the sulfide rims suggest that vapor transport is the main mechanism for sulfur mobilization. Sulfur loss is observed along cracks and crystal boundaries of the initial sulfide grains. After extensive reaction, patches of iron metal appear at the outer edges of the sulfide crystals and large pore spaces form throughout the original sulfides. The experimental metaf-sulfide assemblages resemble those found in low metamorphic grade ordinary chondrites. This suggests metamorphism is mainly responsible for the observed metal-sulfide textures in these chondrites.

Original languageEnglish (US)
Pages (from-to)289-301
Number of pages13
JournalEarth and Planetary Science Letters
Volume151
Issue number3-4
StatePublished - Oct 1997
Externally publishedYes

Fingerprint

ordinary chondrite
chondrites
Sulfides
sulfides
Metals
sulfide
metal
metals
Sulfur
Silicates
sulfur
rims
silicates
silicate
crystal
chondrite
Crystals
mobilization
metamorphism
Iron

Keywords

  • Metals
  • Metamorphism
  • Ordinary chondrites
  • Pyrrhotite
  • Troilite

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Lauretta, D., Lodders, K., Fegley, B., & Kremser, D. T. (1997). The origin of sulfide-rimmed metal grains in ordinary chondrites. Earth and Planetary Science Letters, 151(3-4), 289-301.

The origin of sulfide-rimmed metal grains in ordinary chondrites. / Lauretta, Dante; Lodders, Katharina; Fegley, Bruce; Kremser, Daniel T.

In: Earth and Planetary Science Letters, Vol. 151, No. 3-4, 10.1997, p. 289-301.

Research output: Contribution to journalArticle

Lauretta, D, Lodders, K, Fegley, B & Kremser, DT 1997, 'The origin of sulfide-rimmed metal grains in ordinary chondrites', Earth and Planetary Science Letters, vol. 151, no. 3-4, pp. 289-301.
Lauretta, Dante ; Lodders, Katharina ; Fegley, Bruce ; Kremser, Daniel T. / The origin of sulfide-rimmed metal grains in ordinary chondrites. In: Earth and Planetary Science Letters. 1997 ; Vol. 151, No. 3-4. pp. 289-301.
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