Other
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.113...23w&link_type=abstract
Earth and Planetary Science Letters, Volume 113, Issue 1-2, p. 23-39.
Other
25
Scientific paper
An endothermic phase change in the presence of chemical heterogeneities can act as an efficient filter, such that heavy material is sequestered below the phase change and light material is trapped above the phase change. Due to the fact that the endothermic phase change damps thermal convection, it can act as a ``trap door'' for chemical heterogeneities. Ascending flows which are chemically dense will need more thermal buoyancy to rise through the transition than ascending flows whose composition is closer to the background composition. Likewise, descending flows which are chemically light need more thermal buoyancy to sink through the transition. The results of a suite of numerical calculations of two-dimensional, double diffusive convection in a fluid layer with an endothermic phase change suggests that, if the 670 km seismic discontinuity has a steep enough Clapeyron slope, compositional layering may be induced and dynamically maintained by the transition. Furthermore, these calculations also show that the phase change and compositional boundaries will approximately coincide.
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