Abstract
Four distinct ages of sills intrude the floor rocks under the Bushveld Complex. The first is a metadolerite and pre-dates the Bushveld Complex. The middle two are generally related to the Complex itself. One has quench-textured olivine and orthopyroxene crystals and chemically equates to the parental magma of the Bushveld Complex. The second suite is a hypersthene microgabbro, representative of the second major injection of magma into the Complex. The last is doleritic and does not obviously correlate with any portion of the layered sequence. The sills genetically related to the Complex display several features 1. -lack of chilled margins, coarse grain size, ability to melt country rock xenoliths, extreme heterogeneity 2. -atypical of normal sills, but explicable in their present context.
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