Computer Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..487h&link_type=abstract
Lunar and Planetary Science, volume 27, page 487
Computer Science
Alteration, Chondrites: Cm, Chondrules, Serpentine, Tochilinite
Scientific paper
We have carried out a detailed analysis of 15 chondrules in the CM chondrite LEW 90500, and a characteristic alteration behavior for each of four principal chondrule types has been established. Backscattered electron images and electron microprobe data clearly indicate a strong control on the degree and composition of the hydrous alteration products by the abundance and composition of the primary phases in the chondrule. Alteration initially affected metals and sulfides as well as mesostasis glass. Subsequently pyroxene and Fe-rich olivine were altered followed by the incipient alteration of Mg-rich olivine. Consequently, chondrule types with a high abundance of phases which consistently are most susceptible to aqueous alteration show the highest degree of alteration. The uniformity in alteration behavior for each chondrule type suggests that alteration took place in situ on a parent body. Exchange reactions with a relatively Mg-rich fluid overprinted the primary Fe-rich alteration products of the mesostasis.
Brearley Adrian J.
Hanowski Nicolaus P.
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