Computer Science
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997gecoa..61.2367d&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 61, Issue 12, pp.2367-2373
Computer Science
4
Scientific paper
Liquidus phase relationships in the system MgSiO 3 -Si0 2 at 5.0 GPa have been determined using a multianvil apparatus. Compared to phase relationships at 1 atm, the MgSiO 3 -SiO 2 phase diagram at 5.0 GPa is significantly different in two respects. First, the composition of the eutectic between MgSiO 3 and SiO 2 moves from 65.0 wt% SiO 2 at 1 atm/1547°C (protoenstatite-cristobalite eutectic; Bowen and Andersen, 1914) to 68.8 wt% SiO 2 (orthoenstatite-coesite eutectic) at 5.0 GPa/ 1930°C. Second, no stable two-liquid field is present in the MgSiO 3 -SiO 2 system at 5.0 GPa. The unbroken coesite liquidus curve is inflected indicating the presence of a submerged, metastable miscibility gap below the liquidus. Thus, although the temperature of the solvus critical point is likely to increase with pressure, the dT/dP slope of the SiO 2 liquidus is much steeper and as a result, the immiscibility dome has become submerged completely. The reduction in liquid immiscibility in the MgSiO 3 -SiO 2 system at 5.0 GPa implies that in more complex systems relevant to the Earth, immiscibility will also be suppressed at high pressures.
Dalton John A.
Presnall Dean C.
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