Melting of peridotite at uppermost lower-mantle conditions

Details Melting of peridotite at uppermost lower-mantle conditions Melting of peridotite at uppermost lower-mantle conditions

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.328..514i&link_type=abstract

Nature (ISSN 0028-0836), vol. 328, Aug. 6, 1987, p. 514-517.

Computer Science

86

Earth Mantle, Geochronology, Melting, Peridotite, Vertical Distribution, Geology, Minerals

Scientific paper

A mantle peridotite was melted at conditions equivalent to those obtaining at the top of the lower mantle in order to investigate the effects of a 'magma ocean' early in the earth's history. As has been predicted, MgSiO30-rich perovskite is the liquidus phase. A small amount of CaSiO3-rich perovskite was observed, and may be the second liquidus phase. Using the Mg/Si, Al/Si, Ca/Si, and Ca/Al ratios as constraints, it is shown that primitive upper-mantle compositions can be derived from a chondritic source with a small degree of MgSiO3-perovskite fractionation.

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