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Core formation, evolution, and convection - A geophysical modelA model for the formation and evolution of the earth's core, which provides an adequate energy source for maintaining the geodynamo, is proposed. A modified inhomogeneous accretion model is proposed which leads to initial iron and refractory enrichment at the center of the planet. The probable heat source for melting of the core is the decay of Al-26. The refractory material is emplaced irregularly in the lowermost mantle with uranium and thorium serving as a long-lived heat source. Fluid motions in the core are driven by the differential heating from above and the resulting cyclonic motions may be the source of the geodynamo.
Document ID
19800042041
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ruff, L.
(California Inst. of Tech. Pasadena, CA, United States)
Anderson, D. L.
(California Institute of Technology Pasadena, Calif., United States)
Date Acquired
August 10, 2013
Publication Date
February 1, 1980
Subject Category
Geophysics
Accession Number
80A26211
Funding Number(s)
CONTRACT_GRANT: NGL-05-002-069
Distribution Limits
Public
Copyright
Other

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