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Archean Eon
(redirected from Archean)

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.01 sec.

Archean Eon

 or Archaean Eon or Archeozoic Eon

Older of the two divisions of Precambrian time. The Archean begins with the formation of the Earth's crust 4 billion years ago and extends to 2.5 billion years ago, up to the start of the Proterozoic Eon, the second division of the Precambrian Period. The earliest and most-primitive forms of life (bacteria and cyanobacteria) originated more than 3.5 billion years ago in the middle of the Archean Eon (the Archean's alternative name, Archeozoic, means “ancient life”).



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This northeastern part of the Superior Province, with good exploration potential for gold, base metals and diamond deposits, represents the largest under-explored frontier region of exposed Archean crust in the Canadian Shield.
By slowly chipping away at the rock record, however, researchers are starting to develop a portrait of Earth in its tumultuous first 2 billion years, the Archean era.
is a rapidly growing gold producer operating in the large Iron Quadrangle Archean greenstone gold camp near Belo Horizonte, which is the mining capital of Brazil.
 
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