Formation and alteration of CAIs in Cold Bokkeveld (CM2)

Details Formation and alteration of CAIs in Cold Bokkeveld (CM2) Formation and alteration of CAIs in Cold Bokkeveld (CM2)

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.1913g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, p. 1913

Computer Science

15

Calcium, Aluminum, Inclusions, Meteoritic Composition, Carbonaceous Chondrites, Mineralogy, Textures, Olivine, Perovskites, Silicates, Iron Oxides

Scientific paper

The mode of formation of calcium aluminum-rich inclusions (CAIs) in Cold Bokkeveld (CM2) was investigated, using an X-ray mapping technique, a TEM equipped with an X-ray detector, and an ion microprobe to locate and examine 345 CM2 CAIs in situ. The results of these studies indicate that CAIs in Cold Bokkeveld underwent extensive aqueous alteration that took place within the parent body regolith. Two episodes of deformation were experienced by CM2 CAIs: an earlier nebula phase, which predates the formation of their dust mantles, and a later phase which occurred in an asteroidal regolith. The normal isotopic composition displayed by most spinel-bearing inclusions in Cold Bokkeveld suggests that they did not form by simultaneous melting and evaporation of primitive dust. Two or more events seem to be required. The first event produced the refractory compositions, while the second caused melting of this precursor material.

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