(1) the layered rocks near the upper portions of LMIs which formedafter the mafi minerals had crystallized and sunk, or by the floating ofplagioclase crystals within the magma chamber and (2) the so-called anorthosite massifs, plutons typically containing plagioclase that is andesine orlabradorite (An35-65)' The former are somewhat better understood, the Anorthosite Series in the upper portion of the Critical Zone of the BushveldIgneous Complex being an excellent example.
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