Abstract
In hypersthene bearing hornblende metadiorites near Milford Sound garnet replaces hornblende in ∼5 cm wide subplanar zones, patterned almost certainly on joints. The alteration has been accompanied by a change in bulk rock composition (increase of Al, decrease of Na) and the occurrence constitutes good evidence for external chemical control of the overprinting of “hornblende granulites” with garnet.
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