Physics
Scientific paper
Jun 1970
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970pepi....2..276r&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 2, Issue 4, p. 276-282.
Physics
33
Scientific paper
An evaluation of the abundances of several volatile trace-elements shows that sulphur is depleted in the Earth's mantle and crust by almost two orders of magnitude more than the rare-gases, halogens and water. This deficiency does not appear to be due to a preterrestrial depletion process or volatalization during accretion. It is suggested that the missing sulphur was segregated into the core as part of the lowest melting components in the Fe-S-O system. A feature common to most thermal history models of the Earth is that the temperature of the outermost 100-200 km never exceeds the melting point of the Fe-FeS eutectic. This leads to the retention of some metallic Fe-Ni and iron sulphide in the upper mantle, which was subsequently oxidized and mixed with the lower depleted mantle. The excess abundances of some chalcophile and siderophile elements in the upper mantle can therefore be attributed to this feature. An important consequence of having sulphur as a major element in the Earth's core is that the composition of no single meteorite type satisfactorily resembles the major element composition of an Earth with a Fe-Ni-S core and a mantle similar to pyrolite.
Hall Tracy H.
Murthy Rama V.
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