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Trace Element Partitioning between Taenite and Kamacite; Relationship to the Cooling Rates of Iron Meteorites
Author(s) -
Rasmussen Kaare L.,
Malvin Daniel J.,
Wasson John T.
Publication year - 1988
Publication title -
meteoritics
Language(s) - English
Resource type - Journals
eISSN - 1945-5100
pISSN - 0026-1114
DOI - 10.1111/j.1945-5100.1988.tb00905.x
Subject(s) - kamacite , meteorite , iron meteorite , neutron activation analysis , chemistry , nickel , materials science , metallurgy , radiochemistry , chondrite , physics , astrobiology
— Instrumental neutron activation analysis (INAA) was used to determine Ni, Co, Cu, Ga, As, Au, W, Re and Ir in taenite lamellae isolated by acid dissolution from eight iron meteorites from groups IA, IIIAB and IVA. Taenite is enriched in Ni, Cu, Ga, As, Au, W, Re and Ir relative to kamacite, whereas taenite is depleted in Co. Taenite/kamacite partition ratios in slowly cooled IAB meteorites are farther from unity than those in rapidly cooled IVA meteorites. Taenite/kamacite partition ratios for Cu, Ir, Au and Co may be sensitive cooling rate indicators.