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The Archean (Archaean in British English) is the second major period in geological history. Preceded by the Hadean and followed by the Proterozoic, its start is usually taken as the age of the oldest preserved rocks, either the 4.0 Ga-old (Ga = 109 years = billion years) Acasta gneisses (Canada) or the 3.85–3.80 Ga-old Amitsôq gneisses (Greenland). The International Commission on Stratigraphy (ICS, Jan. 2013) sets its beginning at the Global Standard Stratigraphic Age of 4.0 Ga. The transition to the Proterozoic is typically taken at 2.5 Ga, which was thought to mark a major change in the Earth’s geodynamic style and corresponds roughly to the Great Oxygenation Event. The Archean thus encompasses an approximately 1.5-Ga-long period during which the oldest well-preserved rocks formed and life likely originated. Its tectonic style was different from today, with more abundant mantle plumes, greatly fragmented tectonic plates, and longer mid-oceanic ridges....
References and Further Reading
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Martin, H., Pinti, D.L. (2014). Archean Eon. In: Amils, R., et al. Encyclopedia of Astrobiology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27833-4_98-3
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Archean Eon- Published:
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DOI: https://doi.org/10.1007/978-3-642-27833-4_98-4
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DOI: https://doi.org/10.1007/978-3-642-27833-4_98-3