Physics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pepi...76..209l&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 76, Issue 3-4, p. 209-218.
Physics
2
Scientific paper
A revised analysis of effects of H2O on the phase behavior of forsterite and enstatite at high pressures and temperatures is presented. The water line of the Earth's mantle is now given as ?. This water line is likely to exist at temperatures above approximately 1000°C with its dT/dP slope slightly steeper than that previously reported. The consequences of the new water line are that today's oceans might have been derived from water exsolved from melts at depths shallower, and the base of the lower-velocity zone may be located at a depth shallower than those previously envisaged. The new water line would also modify the forsterite <--> β-phase transition boundary slightly towards higher pressures. The maximum H2O content of the Earth's mantle is likely to be 1.47 wt.%, if the mantle is mainly composed of MgSiO3-Mg2SiO4 with the molecular ratio MgO/SiO2 close to 1.5.
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