Melting of a model chondritic mantle to 20 GPa

Details Melting of a model chondritic mantle to 20 GPa Melting of a model chondritic mantle to 20 GPa

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.322..352o&link_type=abstract

Nature (ISSN 0028-0836), vol. 322, July 24, 1986, p. 352, 353. Sponsorship: Ministry of Education, Science and Culture.

Computer Science

47

Chondrites, Earth Mantle, Melting, Planetary Evolution, Aluminum Oxides, Calcium Oxides, Chemical Composition, Liquidus, Phase Transformations

Scientific paper

Melting experiments using a composition in the five-component system CoO-FeO-MgO-Al2O3-SiO2 corresponding to a model chondritic mantle have been performed, and the results are reported. It is found that the liquidus phase changes from olivine to majorite at a pressure between 12 and 15 GPa. The liquid coexisting with majorite at 20 GPa has a peridotitic composition. In addition, because the CaO/Al2O3 ratio of the liquidus majorite at 20 GPa is lower than that of the subsolidus majorite, partial melting and majorite fractionation at the base of the upper mantle could produce a peridotitic liquid with a CaO/Al2O3 ratio greater than that of the chondritic starting material, consistent with current views on mantle geochemistry.

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