Heat flow from the core and earth's thermal history

Details Heat flow from the core and earth's thermal history Heat flow from the core and earth's thermal history

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....4649s&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #4649

Computer Science

Scientific paper

Earth's core has generally been thought of as playing a passive role in the planet’s thermal history. Also, it is generally believed that radiogenic heating, concentrated in the crust and mantle, and secular cooling of the mantle, are the main energy sources controlling Earth's thermal evolution. In this scenario, the ability of the mantle to transfer heat outward from the core governs the thermal history of the core and the geodynamo. Recent estimates of the conductive heat flux along the core adiabat suggest however that the core supplies more of the terrestrial heat flow than previously thought. So much heat is conducted along a core adiabat that difficulties arise in understanding the timing of inner core formation and the operation of the geodynamo over most of Earth's history. It may be necessary to have radioactivity in the core in order to maintain an adiabatic state in the core over billions of years. With a larger fraction of Earth's heat loss originating in the core, heating from below competes on more equal terms with internal heating as the drive for mantle convection. This implies that upwelling plumes, as well as descending plates, have a strong influence on the overall style of convection in the mantle.

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