Arcaico: Diferenzas entre revisións

No principio do Arcaico, a calor interna da [[Terra]] era preto de 3 veces maior que na actualidade, e aínda dúas veces maior que o seu nível a principio do [[Proterozoico]] (2,500 {{MA}}). A calor calor era a remanente do proceso de acrección planetaria, parciamente procedente da calor de formación do núcleo interno formado por ferro, e parcialemente procedente da calor radioactva pola corta vida de átomos radioactivos como o [[uranio]]-235.

 

 

The Earth of the early Archean may have had a different tectonic style. Some scientists think that because the Earth was hotter, [[plate tectonic]] activity was more vigorous than it is today, resulting in a much greater rate of recycling of crustal material. This may have prevented [[craton]]isation and continent formation until the mantle cooled and convection slowed down. Others argue that the subcontinental lithospheric mantle was too buoyant to [[subduct]], and that the lack of Archean rocks is a function of erosion by subsequent tectonic events. The question of whether or not plate tectonic activity existed in the Archean is an active area of modern geoscientific research. <ref>Stanley, Steven M. ''Earth System History.'' New York: W.H. Freeman and Company, 1999. ISBN 0-7167-2882-6 p. 297-301</ref>