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Where does appinite fit in the classification of plutonic rocks?
Wiki User
∙ 14y ago
Appinite describes intrusive igneous rocks that are rich in the hornblende series amphiboles and are thus mafic to ultramafic (rich in magnesium and iron). Appinites are ultrapotassic meaning that their feldspars are enriched with potassium relative to sodium, and they are uncommon, typically forming in plutons at considerable depth.
Appinite is a subset of lamprophyre, and as such it does not readily fit into established classification schemes. The unusual mineralogy and geochemistry of lamprophyres has led researchers to place them in a separate class. Historically, lamprophyre became a catchall category for rocks of various geneses that were difficult to categorize since they were defined neither by their quartz content nor their origin. The debate is ongoing.
Wiki User
∙ 14y ago
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