The origin and history of the metal and sulfide components of chondrules

Details The origin and history of the metal and sulfide components of chondrules The origin and history of the metal and sulfide components of chondrules

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49..925g&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 49, April 1985, p. 925-939.

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29

Chondrule, Metals, Meteoritic Composition, Planetary Evolution, Sulfides, Cobalt, Fractionation, Grain Size, Iridium, Iron, Nickel, Osmium, Rhenium, Ruthenium, Solar Corona, Meteorites, Origin, History, Metal, Sulfide, Chondrules, Chondrites, Stony Meteorites, Siderophiles, Samples, Meteorite, Semarkona, Ll3 Chondrites, Neutron Activation Analysis, Fractionation, Abundance, Patterns, Refractory Materials, Nickel, Chalcophiles, Selenium, Zinc, Bromine, Reduction, Melting, Thermal Effects, Depletion, Segregat

Scientific paper

Instrumental and radiochemical neutron activation analysis is used to determine the concentrations of 14 siderophile and other nonlithophilic elements in 31 chondrules from the extremely unequilibrated chondrite Semarkona. The results are presented in tables and graphs, characterized in detail, and compared with the results obtained for lithophile elements in the same samples by Grossman and Wasson (1983). The elements studied are found to be significantly more fractionated than the lithophile elements, with variations in chondrule/whole-rock abundances of up to a factor of 1000, a mean ratio of 0.2, and differences between Ni-rich and Ni-depleted chondrules. It is argued that the metal and sulfides in the chondrules represent the composition of the solar nebula before chondrule formation and already contained the siderophile and chalcophile elements, although some Fe was contained in silicates along with Ni, Co, Au, Ge and Se. The segregation of metals during a molten stage is considered of minor importance.

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