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Geochemical Journal
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Is so-called Al-Mg isochron for a meteorite CAI a two component mixing line?

Noboru Nakamura
Geochemical Journal, Vol. 19, No. 4, P. 223-227, 1985

ABSTRACT

An Al-Mg pseudo-isochron is expected for the type B inclusion (CAI) of carbonaceous chondrites on the basis of stoichiometry of anorthite (or hibonite). The linear correlation of excess 26Mg with 27Al/24Mg ratio found for the Allende and Leoville CAI's is well-interpreted as a result of mixing in various proportions (<2%) of two end-members: one with no substantial excess of 26Mg such as spinel, fassaite and melilite, and the other nearly pure anorthite with excess 26Mg (possibly fossil 26Mg) or it's precursor. I would like to call attention to the difficulties in attaining to a “true” Al-Mg internal isochron for meteorite CAI's.

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