Other
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..67..151c&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 67, no. 2, Feb. 1983, p. 151-161.
Other
Carbonaceous Chondrites, Meteoritic Composition, Oxygen Isotopes, Oxygen 17, Oxygen 18
Scientific paper
The ranges of Delta O-18 and Delta O-17 in components of the Murchison (C2) chondrite exceed those in all other meteorites analyzed. Previous authors have proposed that C2 chondrites are the products of aqueous alteration of anhydrous silicates. A model is presented to determine whether the isotopic variations can be understood in terms of such alteration processes. The minimum number (two) of initial isotopic reservoirs is assumed. Two major stages of reservoir interaction are required: one at high temperature to produce the O-16 mixing line observed for the anhydrous minerals, and another at low temperature to produce the matrix minerals. The isotopic compositions severely constrain the conditions of the low-temperature process, requiring temperatures less than 20 C and volume fractions of water greater than 44 percent. Extension of the model to the data on C1 chondrites requires aqueous alteration in a warmer, wetter environment.
Clayton Robert N.
Mayeda Toshiko K.
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