Abstract
With great interest I have read the preceding important communication by Dr. A. E. Ringwood, which seems to confirm a hypothesis about a phase-transition of the olivine between the depths of 200 km. and 900 km. in the Earth, which I proposed (Proc. Roy. Netherlands Acad. Sci., B, 59, 1; 1956), starting from a different basis, namely, the overwhelming evidence in favour of convection-currents in the mantle. This demands the same chemical constitution throughout the whole mantle, and so we have to assume a phase-difference between the upper layer, above 200 km. depth, and the lower layer, below 900 km. depth, with a transition-layer between, in order to explain the density results, derived by Jeffreys, Birch and others on seismological grounds.
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MEINESZ, F. The Olivine–Spinel Transition in the Earth's Mantle. Nature 178, 1304 (1956). https://doi.org/10.1038/1781304a0
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DOI: https://doi.org/10.1038/1781304a0
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