Other
Scientific paper
Feb 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998gecoa..62..545h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 62, p. 545
Other
45
Tungsten Isotopes, Rhenium Isotopes, Osmium Isotopes, Iron Meteorites, Chronology, Melting, Asteroids, Crystallization, Differentiation, Separation, Planetary Composition
Scientific paper
In order to examine the relative timing of metal segregation in the parent bodies of iron meteorites, the authors have developed chemical separation and NTIMS techniques for W and present here an extensive study of W in different groups of iron meteorites. The W-182 isotopic compositions of samples form five of the largest meteorite groups are determined: the nonmagmatic group IAV-IIICD and the magmatic groups IIAB, IIIAB, IVA, and IVB. New Re-Os data from IAB-IIICD irons are presented. The findings indicate that all of the iron meteorite parent bodies underwent metal segregation within 5 Ma of each other, apparently independently of their composition, size, and time of metal crystallization. This implies that the high temperatures necessary for core segregation were achieved at essentially the same time in a variety of parent bodies of varying size and composition.
Horan Mary F.
Smoliar Michael I.
Walker Ray J.
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