The Saamian orogeny is one of the earliest recognizable events in the formation of the Baltic Shield, between 3.1 and 2.9 billion years ago in the Archean and Proterozoic.[1] The Saamian orogeny is associated with intense igneous activity that produced large granitoid plutons. The event lined up with the Katarchean, a period in which the Earth's crust approached its present thickness and sialic rocks, rich in silica and aluminium, became commonplace.[2]
References edit
- ^ Gabor Gaál, Roland Gorbatschev (1987). "An Outline of the precambrian evolution of the baltic shield". Precambrian Research. 35: 15–52. Bibcode:1987PreR...35...15G. doi:10.1016/0301-9268(87)90044-1.
- ^ Salop, L.J. (1982). Geological Evolution of the Earth During the Precambrian. Springer-Verlag.