Demonstration of Mg-26 excess in Allende and evidence for Al-26

Details Demonstration of Mg-26 excess in Allende and evidence for Al-26 Demonstration of Mg-26 excess in Allende and evidence for Al-26

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976georl...3...41l&link_type=abstract

Geophysical Research Letters, vol. 3, Jan. 1976, p. 41-44.

Physics

52

Aluminum 26, Chondrule, Magnesium Isotopes, Meteoritic Composition, Abnormalities, Fractionation, Isotope Effect, Mass Ratios

Scientific paper

The observation of a large anomaly in the isotopic composition of Mg in a Ca-Al rich chondrule from the Allende meteorite is discussed. A strong correlation is found in this chondrule between the Mg-26 excess and the Al/Mg ratio. The most plausible cause of the anomaly is attributed to the in situ decay of now extinct Al-26. However, the general pattern of Mg isotopic anomalies is not yet shown to be fully consistent with the Al-26 hypothesis, since an apparently negative Mg-26 anomaly is obtained which cannot be explained by Al-26. A large natural fractionation effect is observed for Mg isotopes. The resolution of the O anomaly and its relation with Mg effects require further investigation.

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