Melting of garnet peridotite to 13 GPa and the early history of the upper mantle

Details Melting of garnet peridotite to 13 GPa and the early history of the upper mantle Melting of garnet peridotite to 13 GPa and the early history of the upper mantle

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.322..354s&link_type=abstract

Nature (ISSN 0028-0836), vol. 322, July 24, 1986, p. 354-356. Research supported by Okayama University; Ministry of Education, S

Mathematics

Logic

34

Earth Mantle, Garnets, Melting, Peridotite, Planetary Evolution, Liquidus, Magma, Metal Oxides, Phase Diagrams, Solidus

Scientific paper

The authors recently described the first melting experiments on mantle peridotite to 14 GPa, using spinel 1herozolite KLB-1 from Kilbourne Hole, New Mexico to show that partial melts close to the solidus at 5-7 GPa are kamatiitic in composition and that the solidus and liquidus converge at high pressures. Here, further melting experiments on garnet 1herzolite PHN1611 from Thaba Putsoa, Lesotho are reported. The convergence of the solidus and liquidus is confirmed, and a negative dT/dP slope for the liquidus above 7 GPOa is shown. These observations are briefly discussed in terms of their importance to the petrological evolution of the upper mantle and the presence of a magma ocean in the early Archaean.

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