Science, Space and Technology News 2024
The building blocks of the first continents are comprised of three types of granitoid rocks—tonalite, trondhjemite and granodiorite . Credit: Jaana Halla
Understanding what went into making TTGs and the magmas they formed from has been difficult, because so many geological processes occurred between their initial melting and ultimate crystallization. Earlier researchers focused on the trace element composition of these rocks, hoping to find clues about TTG magmas and their source.
The Archean TTG crust is still part of the continents today. For instance, in North America, they make up much of the Canadian Interior between the Cordillera mountain belt in the west and the Grenville and Appalachian mountain belts in the east. The majority of Ontario, Quebec, Manitoba, Saskatchewan, Northwest Territories, and Nunavut is made up of Archean crustal fragments that are dominated by TTGs and their slightly younger and more evolved granite counterparts.
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