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The Archean crust is the oldest preserved continental crust on Earth, and it is largely made up of the rock suite tonalite-trondhjemite-granodiorite (TTG). Quartz and plagioclase are the dominating minerals of TTG rocks, that are characterized by a high SiO2, Na2O, and a low K2O. TTG rarely form today which have led to an uncertainty around their origin, but they are believed to be generated throu
