Computer Science
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..96...49w&link_type=abstract
Earth and Planetary Science Letters, Volume 96, Issue 1-2, p. 49-60.
Computer Science
19
Scientific paper
Experimental determination of equilibrium partitioning relations is complicated when crystals grow in disequilibrium mode in environments of imposed thermal gradient. Contrary to claims in the literature, neither dynamic growth nor thermal gradients produce systematic deviations of measured partition coefficients (D's) toward unity. Non-systematic character in both effects arises from the composite nature of the processes involved. If one can exclude the parts of the process caused by diffusion (both chemical and thermal) the deviations toward unity would be systematic. However, it is shown a priori on a quantitative basis, and from qualitative internal evidence in reported high pressure experiments, that neglect of diffusion leads to errors of interpretation. These errors have a serious impact on our understanding of planetary differentiation. Perovskite fractionation in mantle petrogenesis is shown to remain possible based on, rather than be excluded by, reported experimental data.
Agee Carl
Walker David
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