Determination of post-perovskite phase transition boundary up to 4400 K and implications for thermal structure in D″ layer

Details Determination of post-perovskite phase transition boundary up to 4400 K and implications for thermal structure in D″ layer Determination of post-perovskite phase transition boundary up to 4400 K and implications for thermal structure in D″ layer

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009e%26psl.277..130t&link_type=abstract

Earth and Planetary Science Letters, Volume 277, Issue 1-2, p. 130-136.

Physics

33

Scientific paper

We have determined the post-perovskite phase transition boundary in MgSiO3 in a wide temperature range from 1640 to 4380 K at 119 171 GPa on the basis of synchrotron X-ray diffraction measurements in-situ at high-pressure and -temperature in a laser-heated diamond-anvil cell (LHDAC). The results show a considerably high positive Clapeyron slope of + 13.3 ± 1.0 MPa/K and a transition temperature of about 3520 ± 70 K at the core mantle boundary (CMB) pressure. The thermal structure in D″ layer can be tightly constrained from precisely determined post-perovskite phase transition boundary and the depths of paired seismic discontinuities. These suggest that temperature at the CMB may be around 3700 K, somewhat lower than previously thought. A minimum bound on the global heat flow from the core is estimated to be 6.6 ± 0.5 TW.

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