Abstract

The chilled margins of the Michikamau, Muskox, Skaergaard, and Bushveld intrusions were experimentally remelted over a range of fO2. The observed primary phases, at certain values of fO2 (generally 10−12 to 10−8 atm) correspond with the reported mineralogy of the earliest cumulates. Previous investigations appear to have been conducted at higher values of fO2 (>10−6 atm) at which the experimental mineralogy did not relate to the cumulates.

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