Ni, Ga, Ge and Ir in the metal of iron-meteorites-with-silicate-inclusions

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Scientific paper

Neutron-activation determined concentrations of Ni, Ga, Ge and Ir in the metal of 19 iron-meteorites-with-silicate-inclusions are in good agreement with the classification of , and , which is based mainly on the mineralogy and texture of the inclusions. Odessa-type and Copiapo-type irons-with-silicate-inclusions are found to be very closely related to each other, and to other members of chemical group I of the iron meteorites. Kendall County is probably related to these irons. Elga is a new Weekeroo Station-type iron-with-silicate-inclusion, and Netschaëvo is closely related to these objects. Tucson is unique. Odessa-type and Copiapo-type meteorites appear to have formed non-igneously, whereas shock mixing and associated differentiation of silicates appears to have been a late step in the history of the Weekeroo Station-type irons.

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