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Xenoliths retrieved from lamprophyric hosts in the Michipicoten belt fall into four groups defined by Al–Mg contents but do not include mantle peridotite. Based on immobile trace element abundances, the xenoliths are derived from magmas associated with the main phase of arc volcanism between 2.75 and 2.70Ga or are co-genetic with the orogenic shoshonite suite.Trace elements distinguish two styles...
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