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Title: Thermal structure of the accreting earth

Abstract

The energy associated with the accretion of the earth and the segregation of the core is more than sufficient to melt the entire earth. In order to understand the thermal evolution of the early earth it is necessary to study the relevant heat transfer mechanisms. In this paper we postulate the existence of a global magma ocean and carry out calculations of the heat flux through it in order to determine its depth. In the solid mantle heat is transferred by the upward migration of magma. This magma supplies the magma ocean. The increase in the mantle liquidus with depth (pressure) is the dominant effect influencing heat transfer through the magma ocean. We find that a magma ocean with a depth of the order of 20 km would have existed as the earth accreted. We conclude that the core segregated and an atmosphere was formed during accretion.

Authors:
;
Publication Date:
Research Org.:
Department of Geological Sciences, Cornell University
OSTI Identifier:
5739476
Resource Type:
Journal Article
Journal Name:
J. Geophys. Res.; (United States)
Additional Journal Information:
Journal Volume: 90:S2
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; EARTH PLANET; PLANETARY EVOLUTION; EARTH MANTLE; HEAT FLUX; HEAT TRANSFER; MAGMA; PLANET-SYSTEM ACCRETION; PRESSURE DEPENDENCE; ENERGY TRANSFER; PLANETS; SOLAR SYSTEM EVOLUTION; 640107* - Astrophysics & Cosmology- Planetary Phenomena

Citation Formats

Turcotte, D L, and Pflugrath, J C. Thermal structure of the accreting earth. United States: N. p., 1985. Web. doi:10.1029/JB090iS02p0C541.
Turcotte, D L, & Pflugrath, J C. Thermal structure of the accreting earth. United States. https://doi.org/10.1029/JB090iS02p0C541
Turcotte, D L, and Pflugrath, J C. 1985. "Thermal structure of the accreting earth". United States. https://doi.org/10.1029/JB090iS02p0C541.
@article{osti_5739476,
title = {Thermal structure of the accreting earth},
author = {Turcotte, D L and Pflugrath, J C},
abstractNote = {The energy associated with the accretion of the earth and the segregation of the core is more than sufficient to melt the entire earth. In order to understand the thermal evolution of the early earth it is necessary to study the relevant heat transfer mechanisms. In this paper we postulate the existence of a global magma ocean and carry out calculations of the heat flux through it in order to determine its depth. In the solid mantle heat is transferred by the upward migration of magma. This magma supplies the magma ocean. The increase in the mantle liquidus with depth (pressure) is the dominant effect influencing heat transfer through the magma ocean. We find that a magma ocean with a depth of the order of 20 km would have existed as the earth accreted. We conclude that the core segregated and an atmosphere was formed during accretion.},
doi = {10.1029/JB090iS02p0C541},
url = {https://www.osti.gov/biblio/5739476}, journal = {J. Geophys. Res.; (United States)},
number = ,
volume = 90:S2,
place = {United States},
year = {Fri Feb 15 00:00:00 EST 1985},
month = {Fri Feb 15 00:00:00 EST 1985}
}