Archean Crust Evolution and
Ancient Mantle Geodynamics
✦ Field camp on Robinson Lake in the Central Slave Basement Complex of the Slave Craton, August 2016. (photo: Steve Shirey)
The Archean Eon (2500 myr to nearly 4000 myr before the present) was a time when the continental crust was first differentiated and stabilized. It marked the transition to modern-style plate tectonics and was perhaps the most important period for the formation of Earth’s mineral wealth (e.g. gold, nickel, copper, uranium, platinum, chromium, and diamonds).
This USGS map depicts the ages of the last tectonothermal event that the crust of the Earth has experienced. Archean crust is shown in orange. While not a large percentage of the crust by volume, Archean crust occupies a central position as a nucleus for continental growth and as a site for the production of mineThis USGS map depicts the ages of the last tectonothermal event that the crust of the Earth has experienced. Archean crust is shown in orange. While not a large percentage of the crust by volume, Archean crust occupies a central position as a nucleus for continental growth and as a site for the production of mineral resources.