The melting of Al-bearing perovskite at the core-mantle boundary

Details The melting of Al-bearing perovskite at the core-mantle boundary The melting of Al-bearing perovskite at the core-mantle boundary

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pepi..115..219w&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 115, Issue 3-4, p. 219-228.

Physics

10

Scientific paper

We have investigated the melting temperature of Al-bearing perovskites including (Ca,Al)(Al,Si)O3 and (Mg,Al)(Al,Si)O3, as well as MgSiO3 and CaSiO3, at high pressure conditions, using empirical melting equation. This study indicates that the incorporation of 25 mol% Al2O3 into CaSiO3 decreases its melting temperature at the core-mantle-boundary (CMB) from 5900 to 4400 K. A less dramatic effect is calculated for Al2O3 in MgSiO3, with a decrease in melting temperature from 5500 to 5200 K at the CMB. Compared to the liquidus of pyrolite in the deep mantle, estimated from the experimental observations of [Zerr et al. (1998)], Ca-Al perovskite provides a more probable source of the partial melt proposed to exist in the D'' region.

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