Other
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.290..208d&link_type=abstract
Nature, vol. 290, Mar. 19, 1981, p. 208-213.
Other
56
Abundance, Earth Mantle, Earth Planetary Structure, Neodymium Isotopes, Planetary Evolution, Strontium Isotopes, Chondrites, Earth Crust, Heterogeneity, Mass Balance, Meteoritic Composition, Rocks, Samarium Isotopes, Stratification
Scientific paper
It is noted that the Nd and Sr isotopic data demand a mantle in which heterogeneities have existed for billions of years, the real question being the topology and distribution of the heterogeneities. The layered mantle model is considered a special case in which there are only vertical heterogeneities with sharp boundaries. The heterogeneous mantle model presented here is another type in which there is little or no mean vertical variation and in which the heterogeneities are isolated and have a range of chemical differences and a large range of sizes. It is thought that the main question about the heterogeneous mantle model is probably the uncertainty of the survival time of the heterogeneities, while the principal question about the layered model may be the mechanism by which the layers are separated. However, if some heterogeneities must exist within the layers of the layered mantle model and if the heterogeneous model has some vertical stratification, then the distinctions between the models begin to blur.
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