Thermal metamorphic history of a Ca, Al-rich inclusion constrained by high spatial resolution Mg isotopic measurements with NanoSIMS 50L

Details Thermal metamorphic history of a Ca, Al-rich inclusion constrained by high spatial resolution Mg isotopic measurements with NanoSIMS 50L Thermal metamorphic history of a Ca, Al-rich inclusion constrained by high spatial resolution Mg isotopic measurements with NanoSIMS 50L

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010m%26ps...45..583i&link_type=abstract

Meteoritics and Planetary Science, Volume 45, Issue 4, pp. 583-595.

Physics

1

Scientific paper

Mg isotope data were collected by NanoSIMS with high-precision and high-spatial resolution from a coarse-grained type B Ca-, Al-rich inclusion (CAI), EK1-6-3, in the Allende CV3 chondrite to evaluate the time scale of parent body thermal metamorphism. The CAI melilite and fassaite contain excesses of 26Mg (26Mg*) from the in-situ decay of 26Al; the inferred initial ratio, (26Al/27Al)0=(5.8+/-2.4)×10-5, is consistent with many previously reported coarse-grained CAIs from CV chondrites (e.g., MacPherson et al. 1995). However, the anorthite has heterogeneous (26Al/27Al)0, ranging from 1.8×10-5 to 3.3×10-6. The 26Al-26Mg systematics within the anorthite is consistent with thermal diffusion of Mg isotopes during metamorphism. We also show that the heterogeneous distribution of 26Mg* in anorthite could have resulted from thermal diffusion of 26Mg* over a 0.6-0.8Ma time span. Mg diffusion thus may be responsible for the (26Al/27Al)0 heterogeneity within anorthite in CAIs.

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