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Many of the oldest ∼3.5 Ga komatiites have low Al 2 O 3 /TiO 2 and depleted HREE, features that are attributed to garnet fractionation at some stage during their formation. It is not known, however, whether this fractionation took place at the time of melting, or well before, perhaps during the crystallization of an early magma ocean. We report here the Hf isotope compositions...
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