Fayalite-rich rims, veins, and halos around and in forsteritic olivines in CAIs and chondrules in carbonaceous chondrites - Types, compositional profiles and constraints of their formation

Details Fayalite-rich rims, veins, and halos around and in forsteritic olivines in CAIs and chondrules in carbonaceous chondrites - Types, compositional profiles and constraints of their formation Fayalite-rich rims, veins, and halos around and in forsteritic olivines in CAIs and chondrules in carbonaceous chondrites - Types, compositional profiles and constraints of their formation

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1389h&link_type=abstract

(Conference on Isotope Tracers in Geochemistry and Geophysics, Pasadena, CA, Mar. 23-25, 1987) Geochimica et Cosmochimica Acta (

Physics

Geophysics

14

Carbonaceous Chondrites, Fayalite, Meteoritic Composition, Olivine, Aluminum, Calcium, Forsterite, Iron, Nickel

Scientific paper

Fayalitic intergrowths in different olivine-bearing objects in the Allende and Groznaya CV3 chondrites were studied in reflected light and with the backscattered-electron-imaging technique and the concentration profiles were measured quantitatively with an automated EMPA. The information was discussed in the framework of the possible conditions and the mechanism of fayalitic olivines formation. The results suggest that the fayalitic olivine was formed by condensation from the solar nebula gas, through an increase in the H2O/H2 ratio subsequent to condensation of forsterite. At that stage, FeNi inclusions in olivine were also oxidized, and fayalitic halo around the metal were formed by Fe diffusion subsequent to the condensation of the fayalitic olivine. The narrow compositional variations of the fayalitic rims (Fa34-Fa46) in different objects in Allende and Groznaya suggest very similar conditions during the condensation of fayalite in both meteorites.

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