Abstract
olivine-bearing rocks in the lower half of OB I. The olivinerich rocks also define pegmatoidal ‘pothole’ structures. (3) Rock composition, texture and grain size vary considerably in olivinebearing units, characterized by segregation between coarser mafic regions and medium-grained felsic regions. (4) Primary plagioclase in olivine-rich rocks has an eroded texture. (5) Modal variations KEY WORDS: layered intrusions; partial melting; platinum-group elements are consistent with progressive incongruent melt reactions, and hydrous minerals are most abundant in olivine-rich rocks. (6) Hydrous melt inclusions (now crystallized to polyphase, hydrous mineral-bearing assemblages) are present in olivine and chromite.
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