Other
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.3155a&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 51, Dec. 1987, p. 3155-3173.
Other
6
Chondrites, Solar Corona, Stellar Composition, High Temperature, Refractory Metals
Scientific paper
A detailed petrographic and chemical study of Zelda (a gigantic sulfide-rich Fremdling from the Allende Ca-rich inclusion, CAI, Egg 6) and its contact with the host was conducted using analytical SEM and electron-microprobe techniques, and the results were compared with those obtained on other sulfide-rich and oxide-rich Fremdlinge. Strong evidence is presented that Zelda, a type-example of sulfide-rich Fremdlinge, has been formed from a preexisting Ur-Fremdling, similar by composition to Willy, by closed-system sulfidization of magnetite and metal. At least two different sulfidization mechanisms appear to have occurred in altering Fremdlinge: one producing compositionally homogeneous equigranular objects such as Zelda, the other producing compositionally and texturally heterogeneous objects.
Armstrong Thomas J.
Hutcheon Ian D.
Wasserburg Gerald J.
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