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Energetics of core formation
Abstract
The loss of gravitational energy on core formation is calculated for the case of simple unmixing of two components, whose equations of state are found from the present density distribution. Without allowance for thermal expansion, the mean energy available for heating is 600 cal/g; with an approximate allowance for thermal expansion, this is reduced to 400 cal/g, which is equivalent to a mean rise of temperature of about 1600°. The moment of inertia of the undifferentiated earth is found to be about 10% greater than that of the present state, for the spherical model.
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Core formation from a chemically uniform Earth would raise Earth's temperature by about 2000°C.
“Tozer (1965) and Birch (1965b) (corrected in Flasar & Birch 1973) estimated the gravitational energy released by core formation from a chemically uniform earth would raise its temperature by about 2000°C.”
From Speculations on the Thermal and Tectonic History of the Earth (2007) · cites this paper as Birch (1965b)
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Research works printed but not linked: 26
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Cited by
Sorted by citations
Speculations on the Thermal and Tectonic History of the Earth
McKenzie, D., & Weiss, N. (2007) · Geophysical Journal of the Royal Astronomical Society · doi:10.1111/j.1365-246x.1975.tb05855.x · Cited by 335
Energetics of core formation: A correction
Flasar, F. M., & Birch, F. (1973) · Journal of Geophysical Research · doi:10.1029/jb078i026p06101 · Cited by 122
Self-citation
Metadata
- Authors
- Birch, F.
- Corresponding author
- Birch, Francis
- Venue
- Journal of Geophysical Research
- Publisher
- American Geophysical Union (AGU)
- Published
- 1965-12-15
- Volume
- 70
- Issue
- 24
- Pages
- 6217-6221
- ISSN
- 0148-0227 (ISSN-L)
- OpenAlex
- W2074833830
- Cited by
- 107
- References
- 0
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 3 · 2023: 3 · 2022: 2 · 2021: 1 · 2020: 1 · 2019: 1 · 2018: 3 · 2016: 1 · 2015: 2 · 2014: 2 · 2013: 1 · 2012: 3
- FWCI
- 0.48
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Geophysical Research Atmospheres (publishedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geophysics › High-pressure geophysics and materials
- Physical Sciences › Earth and Planetary Sciences › Space and Planetary Science › Astro and Planetary Science
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geological and Geochemical Analysis
- Keywords
- core formation, gravitational energy, thermal expansion, moment of inertia, density distribution, equation of state, core-mantle differentiation
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