Universidad Complutense de Madrid
E-Prints Complutense

Heat flow evolution of the Earth from paleomantle temperatures: Evidence for increasing heat loss since 2.5 Ga



Downloads per month over past year

Ruiz Pérez, Javier (2017) Heat flow evolution of the Earth from paleomantle temperatures: Evidence for increasing heat loss since 2.5 Ga. Physics of the earth and planetary interiors, 269 . pp. 165-171. ISSN 0031-9201

[img] PDF
Restringido a Repository staff only


Official URL: http://www.sciencedirect.com/journal/physics-of-the-earth-and-planetary-interiors/vol/269/suppl/C


Earth currently loses two to five times as much heat through its surface as it is internally produced by radioactivity. This proportion cannot be extrapolated into the past, because it would imply high interior temperatures and catastrophic melting of the planet in ancient times. The heat loss evolution of the Earth cannot therefore be described by a constant heat flow decreasing. This is consistent with previous work finding that the mantle heated up until 2.5–3.0 Ga and then progressively cooled down. The present work derives a first-order heat loss evolution of the Earth by comparing the evolution of the total heat content of the silicate Earth (as described by mantle potential temperatures deduced from the melting conditions of ancient non-arc basalts) with the total radioactive heat production. The results show that the heat flow was declining, and the mantle heating-up, until 2.5 Ga, but that after this time the heat flow has been slowly (but constantly) ncreasing, and the mantle cooling-down, until the present-day. The change in heat loss trend is roughly coeval with other major geological, geochemical and environmental changes, and could indicate the starting of the modern-style of plate tectonics. This work provides therefore the first quantitative evidence of change in terrestrial heat loss regime, and suggests that substantial variations in the internal heat budget occurred during Earth’s history.

Item Type:Article
Uncontrolled Keywords:Thermal history, Heat flow, Urey ratio, Geodynamical evolution, Environmental evolution
Subjects:Sciences > Geology > Geodynamics
ID Code:50846
Deposited On:23 Jan 2019 09:09
Last Modified:23 Jan 2019 09:09

Origin of downloads

Repository Staff Only: item control page