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Published 1970 | public
Journal Article

The composition of the lower mantle


The equation of state of the lower mantle is found by requiring that both the density and the seismic parameter ∅ = (∂P / ∂P_s = V ^2-(4/3)V^2_s be satisfied. The zer the lower mantle can then be found and the mean atomic weight can be inferred. For most published density models for the Earth the FeO content of the lower mantle is greater than the upper mantle. This indicates that the mantle is not homogeneous in composition as is usually assumed.

Additional Information

© 1970 North-Holland Publishing Company. Contribution 1623, Division of Geological Sciences, California Institute of Technology, Pasadena, California 91109, U.S.A. This research was supported by National Science Foundation Grant GA 1003.

Additional details

August 19, 2023
October 26, 2023