Oxygen isotopic compositions of enstatite chondrites and aubrites

Conference · Wed Nov 14 23:00:00 EST 1984 · JGR, J. Geophys. Res., (Sect.) C:; (United States)

OSTI ID:5822544

Clayton, R N; Mayeda, T K

Oxygen isotopic compositions have been measured for ten EH chondrites, eight EL chondrites, and nine aubrites. The mean delta O-18 and delta O-17 values are: 5.31 and 2.74, 5.57 and 2.96, 5.24 and 2.70, respectively. Within the EH group, more equilibrated meteorites are fractionated toward higher heavy isotope abundances than the less equilibrated meteorites. Small departures of individual meteorites from a common mass fractionation occur for some of the EH samples. The aubrites may be genetically related to either the EH or EL group or to both. Almost all of the measured isotopic compositions are indistinguishable from the terrestrial oxygen isotope fractionation line, suggesting a genetic relationship among the earth, the moon, and the enstatite meteorites.

• Research Organization: Chicago Univ., IL
• OSTI ID: 5822544
• Report Number(s): CONF-840385-
• Journal Information: JGR, J. Geophys. Res., (Sect.) C:; (United States), Journal Name: JGR, J. Geophys. Res., (Sect.) C:; (United States) Vol. 89; ISSN JJGAD
• Country of Publication: United States
• Language: English

Related Subjects

640107* -- Astrophysics & Cosmology-- Planetary Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALKALINE EARTH METAL COMPOUNDS
CHONDRITES
EARTH PLANET
ELEMENTS
ENSTATITE
ISOTOPE RATIO
MAGNESIUM COMPOUNDS
MAGNESIUM SILICATES
METEORITES
MINERALS
MOON
NONMETALS
OXYGEN
OXYGEN COMPOUNDS
PLANETS
PYROXENES
SATELLITES
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
STONE METEORITES