Premium
Magnesium isotopic variations in hibonite from the Murchison Meteorite: An ion microprobe study
Author(s) -
Macdougall J. D.,
Phinney D.
Publication year - 1979
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl006i003p00215
Subject(s) - murchison meteorite , allende meteorite , meteorite , chondrite , microprobe , isotopes of magnesium , geology , carbonaceous chondrite , isotope , astrobiology , fractionation , electron microprobe , mineralogy , chemistry , physics , nuclear physics , organic chemistry
Ion microprobe measurements show that some hibonite crystals from refractory‐rich inclusions in Murchison contain isotopically anomalous Mg. The observed effects include (1) the largest mass fractionation ever observed in nature for this element, ∼10% per mass unit; (2) small 26 Mg excesses; (3) isotopic variability on a scale of microns or less in individual grains. These observations are corroborative evidence for the primitiveness of the Murchison inclusions. More importantly, they indicate that the types of Mg isotopic anomalies previously observed in Allende and Leoville inclusions are not confined to CV meteorites.