Differing Powers of Crystal Nucleation as a Factor Producing Diversity in Layered Igneous Intrusions

摘要: "To account for a type of rhythmic unit found in the Bushveld complex South Africa and probably other layered intrusions, hypothesis is put forward dependent on different powers crystal nucleation from supersaturated magma. It suggested, example, that three common primary precipitate minerals, chromite, bronzite, bytownite nucleated this order which differing complexity their structures unit, beginning with chromitite, passing upwards into bronzitite ending bytownite-rich rock result these crystals accumulating successively at bottom liquid."