Gallium-bearing sphalerite in a metal-sulfide nodule of the Qingzhen (EH3) chondrite

Details Gallium-bearing sphalerite in a metal-sulfide nodule of the Qingzhen (EH3) chondrite Gallium-bearing sphalerite in a metal-sulfide nodule of the Qingzhen (EH3) chondrite

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986metic..21...23r&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 21, March 31, 1986, p. 23-31. NASA-supported research.

Computer Science

3

Chondrites, Copper Sulfides, Gallium, Meteoritic Composition, Zincblende, Gas-Metal Interactions, Interstellar Chemistry, Kamacite, Melting, Nodules, Phase Transformations, Solar Corona, Textures, Meteorites, Gallium, Sphalerite, Metal, Sulfide, Nodules, E3 Chondrites, Qingzhen, Enstatites, Stony Meteorites, Texture, Heating, Formation, Melting, Sulfide, Nucleation, Perryite, Inclusions, Phases, Mineralogy, Injection, Droplets, Diffusion, Saturation, Cooling, Hypotheses, Sem, Experiments, Procedure, Petrogr

Scientific paper

The composition and possible history of the Qingshen (EH3) chondrite is presented. The chondrite contains a population of spheroidal metal-sulfide nodules, which display textural evidence of reheating and melting. Evidence of metal sulfuration is also present, suggesting replacement of metal by sulfide during melting. This process has led to the nucleation of perryite along metal-sulfide interfaces. The Ga-bearing sphalerite that was found may have formed by injection of molten sulfide droplets into the metal followed by subsolidus diffusion of Ga from the metal into the sulfide. The latter may occur because of Ga supersaturation in the metal during progressive sulfuration and its decreased affinity for the metal phase during cooling below the taenite-kamacite transition point.

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