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Chemical inhomogeneity of the mantle

Anderson, Don L. (1968) Chemical inhomogeneity of the mantle. Earth and Planetary Science Letters, 5 . pp. 89-94. ISSN 0012-821X. doi:10.1016/S0012-821X(68)80020-2.

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The major portion of the increase in density and elastic properties through the transition region of the upper mantle can be attributed to phase changes. However, the density increase in the Earth is slightly greater and the observed increase of the seismic velocities is slightly less than predicted on the basis of phase changes alone. The data can be reconciled with an increase in the mean atomic weight of about 1.5 to 1.6 units. This implies an increase in the FeO/MgO ratio of about 0.17 to 0.18, the lower mantle bring more iron rich than the upper mantle.

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Additional Information:© 1968 Published by Elsevier B.V. Received 8 September 1968. This research was supported by the Air Force Office of Scientific Research Office of Aerospace Research, United States Air Force, under AFOSR contract AF-49(638)-1337 and National Science Foundation Grant GP 2806 (Upper mantle Project). I profited from helpful conversations with Tom Ahrens, Charles Archambeau and A.E. Ringwood.
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Air Force Office of Scientific Research (AFOSR)AF-49(638)-1337
NSFGP 2806
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Caltech Division of Geological Sciences1554
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Official Citation:Don L. Anderson, Chemical inhomogeneity of the mantle, Earth and Planetary Science Letters, Volume 5, 1968, Pages 89-94, ISSN 0012-821X, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45251
Deposited By: Tony Diaz
Deposited On:28 Apr 2014 21:20
Last Modified:10 Nov 2021 17:02

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