Mathematics – Logic
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.308..174f&link_type=abstract
Nature (ISSN 0028-0836), vol. 308, March 8, 1984, p. 174, 175.
Mathematics
Logic
24
Geochemistry, Geochronology, Iron, Metal-Water Reactions, Planetary Evolution, Chemical Evolution, Earth Core, Pressure Effects, Temperature Effects
Scientific paper
The characteristics of the Fe-H2O reaction examined to determine the significance of the reaction in the evolution of the earth. It is assumed that the primordial material was in a 9:1 ratio of high- to low-temperature condensates. If a substantial water fraction was retained in serpentine and/or chlorite in the low-temperature component, then a two-step reaction would have occurred with iron in the high-temperature component. All water is projected to have reacted with Fe except in the surface regions of the growing earth. The resultant FeH(x) species would have sunk to form a protocore, while remaining H2O would have been degassed to form a hydrosphere. The reaction products that joined the core are calculated to have contributed a 33.2 percent fraction of the current density, in line with the 32.4 percent fraction predicted from recent seismological studies by Dziewonski and Anderson (1981).
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