Mathematics – Logic
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rspta.301..359j&link_type=abstract
(Royal Society, Discussion on the Origin and Evolution of the Earth's Continental Crust, London, England, Feb. 21, 22, 1980.) Ro
Mathematics
Logic
126
Boundary Layers, Continents, Density (Mass/Volume), Earth Planetary Structure, Geochemistry, Planetary Evolution, Earth Core, Earth Mantle, Earth Surface, Mass Transfer, Planetary Composition, Plates (Tectonics), Thermal Boundary Layer
Scientific paper
The earth's mass density increases with depth to a value of about 13 Mg/cu m at its center. Some of the increase is due to gravitational self-compression, but well over half occurs, across two major compositional transitions, one at the planetary surface and one at the core-mantle boundary. The mass-transport mechanisms presumed to be operating within the mantle and core should tend to deposit chemically differentiated material at these transitions and thereby to form compositionally distinct boundary layers of intermediate density. As yet, the evidence for a chemical boundary layer (CBL) at the core-mantle interface is largely circumstantial. The model discussed is founded on the notion that the crust forms only the upper part of the surficial CBL. Below the crust is presumed to be a layer of refractory peridotite. The model accounts for certain perplexing seismological and petrological observations and offers new insights into the problem of continental evolution.
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