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Gallium-bearing sphalerite in a metal-sulfide nodule of the Qingzhen (EH3) chondriteThe 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.
Document ID
19860051089
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Rambaldi, E. R.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Rajan, R. S.
(California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Housley, R. M.
(Rockwell International Science Center Thousand Oaks, CA, United States)
Wang, D.
(Chinese Academy of Sciences, Institute of Geochemistry, Guiyang People's Republic of China, United States)
Date Acquired
August 12, 2013
Publication Date
March 31, 1986
Publication Information
Publication: Meteoritics
Volume: 21
ISSN: 0026-1114
Subject Category
Lunar And Planetary Exploration
Accession Number
86A35827
Distribution Limits
Public
Copyright
Other

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