Toshiko K. Mayeda

TL;DR: In this paper, the Murchison (C2) chondrite was analyzed and a model was presented to determine whether the isotopic variations can be understood in terms of such alteration processes.

TL;DR: On the basis of 18O/16O and 17O/ 16O ratios, meteorites and planets can be grouped into at least six categories, as follows: (1) the terrestrial group, consisting of the earth, moon, differentiated meteorites, and enstatite chondrites; (2) types L and LL ordinary chondrite; (3) type H ordinary chonderes; (4) anhydrous minerals of C2, C3, C4 carbonaceous chondites; (5) hydrous matrix minerals of c2 carbonaceous

TL;DR: In this paper, a recalculated calcite-graphite fractionation curve based on new calculations of partition functions ratios for calcite suggests that this system is well suited for high-temperature isotopic thermometry of graphitic marbles as first proposed by Valley and O'Neill (1981).

TL;DR: A petrologic, geochemical, and oxygen isotropic study of the CR chondrites including Renazzo, Al Rais, El Djouf 001 and the paired Acfer meteorites, EET87770 and Y791498 is presented in this paper.

TL;DR: The mineralogy, oxygen isotope, and bulk chemical composition of recovered samples of the Tagish Lake meteorite are intermediate between CM and CI meteorites, suggesting that the Tagishes Lake meteoroid may be one of the most primitive solar system materials yet studied.