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- W16701496 abstract "The petrogenetic significance of plagioclase megacryst-bearing Archean rocks was considered. It was suggested that these developed in mid-to upper-crustal magma chambers that were repeatedly replenished. Crystallization of megacrysts from a primitive liquid that evolves to an Fe-rich tholeiite (with LREE enrichment) is nearly isothermal and is an equilibrium process. Cumulates probably form near the margins of the chambers and liquids with megacrysts are periodically extracted and can appear as volcanics. Some flows and intrusives are found in arc-like settings in greenstone belts. Megacrystic dikes represent large volumes of melt and dike swarms such as the Metachawan swarm of Ontario suggest multiple sources of similar compositions. A complex series of melt ponding and migration are probable and involve large amounts of liquid." @default.
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- W16701496 date "1988-01-01" @default.
- W16701496 modified "2023-09-23" @default.
- W16701496 title "The Petrogenetic Significance of Plagioclase Megacrysts in Archean Rocks" @default.
- W16701496 hasPublicationYear "1988" @default.
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