Computer Science
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.1989w&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 50, Sept. 1986, p. 1989-1995.
Computer Science
11
Chondrites, Evolution (Development), Iron, Meteoritic Composition, Nickel, Electron Microscopy, Fractionation, Neutron Activation Analysis, Nodules, Shock Heating, Vaporizing
Scientific paper
Five large metal nodules, a composite sample of five small metal nodules, one troilite nodule, and two metal veins from five ordinary chondrites were analyzed by electron microprobe and neutron activation analysis. Metal nodules and veins in H chondrites generally consist of large single crystals of kamacite, whereas L nodules contain significant taenite. Most nodules and veins are depleted by large factors ranging up to 240 in refractory siderophiles (Re, Os, Ir, Pt). Tungsten (normally a refractory siderophile) and Au, As, and Ga (volatile siderophiles) have abundance ratios similar to those of the common siderophiles Fe, Co and Ni. It is proposed that the metal with extremely low refractory-element contents was produced by shock-induced vaporization of chondritic material. The refractory elements condensed near the point of vaporization and were not transported with the vapor. Because the shock-generated gas was mildly oxidizing, W formed volatile oxides.
Rubin Alan E.
Wasson John T.
Widom Elisabeth
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