Natural SciencesEarth SciencesGeologyGeochemistryMineralogyStratigraphyContinental Margin GeologyContinental Margin StructureMantle GeochemistryMineral GeochemistryPlate TectonicsRegional TectonicsContinental Crust CompositionContinental Margin Mineral ResourcesMagma Source CharacterizationMagma Source GeochemistryMineralogical CompositionMineralogical InterpretationMineralogical TransformationRegional Geology
Anorthitic plagioclase refers to the plagioclase whose An content ranges from 85％ to 100％, and is rarely seen on the earth. As J. S. Beard and M. Wilson pointed out, terrestrial anorthitic plagioclase mainly occurs in the cumulate gabbros of the island arc or active continental margin (such as Lesser Antilles Island, Aleutians, Klamath Mts. of western America, etc.), and is not found in