The oxygen isotope record in Murchison and other carbonaceous chondrites

Details The oxygen isotope record in Murchison and other carbonaceous chondrites The oxygen isotope record in Murchison and other carbonaceous chondrites

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..67..151c&link_type=abstract

Earth and Planetary Science Letters, Volume 67, Issue 2, p. 151-161.

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Scientific paper

The ranges of δ18O and δ17O 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 16O-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 < 20°C and volume fractions of water > 44%. Extension of the model to the data on C1 chondrites requires aqueous alteration in a warmer, wetter environment.

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