Analysis of Chemical Zoning in Isolated and Chondrule Olivines in the Yamato 791717 CO3 Carbonaceous Chondrite: Fractional Crystallization or Atomic Diffusion?

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Chondrites: Co3, Cooling Rates, Diffusion, Olivine, Zoning: Chemical

Scientific paper

Chemical zoning of isolated and chondrule olivine grains in Yamato(Y) 791717(CO3) has been investigated by applying alternative models: fractional crystallization and atomic diffusion. It was shown that diffusive modification is the dominant factor controlling patterns of chemical zoning in both olivines. From a comparison of cooling rates, it may be concluded that isolated olivines were originated from chondrules. Chemical zoning also suggests that this meteorite has a thermally metamorphic history.

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