Earth formed about 4.6 billion years ago, during the geological eon known as the Hadean. The name “Hadean” comes from the ...

But finding geological evidence of the extent of Earth's life (that is, locating rocks that formed with Earth, not on it) is ...

The lack of CRM explains the lack of carbonatites before 2·7 Ga. However, the lower fO 2 of the Archaean asthenosphere and higher volatile contents caused more prevalent HRM in the Hadean and Archaean ...