Phase relations in the system diopside-jadeite at high pressures and high temperatures

Details Phase relations in the system diopside-jadeite at high pressures and high temperatures Phase relations in the system diopside-jadeite at high pressures and high temperatures

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..47..398l&link_type=abstract

Earth and Planetary Science Letters, Volume 47, Issue 3, p. 398-402.

Computer Science

4

Scientific paper

Phase behaviour in the system diopside-jadeite (CaMgSi2O6-NaAlSi2O6) have been investigated in the pressure region 100-300 kbar at about 1000°C in a diamond-anvil press coupled with laser heating. The omphacite solid solution extends from 30 to at least 200 kbar for the entire system. Omphacites, ranging in composition from pure diopside to more than 40 mole % jadeite, transform to diopside (II) at pressures greater than 230 kbar. Diopside (II), which probably possesses a perovskite-type structure, cannot be preserved when experiments are quenched to ambient conditions. Jadeite-rich omphacites were found to decompose into an assemblage of NaAlSiO4(CaFe2O4-type structure) + stishovite + diopside (II) (?) at pressures greater than about 260 kbar. These results suggest that an eclogitic model mantle would not display the 400-km seismic discontinuity. Moreover, sodium in the transition zone and lower mantle would most likely be accommodated in phases of omphacite and diopside (II).

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