Physics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pepi...32..193h&link_type=abstract
Physics of the Earth and Planetary Interiors (ISSN 0031-9201), vol. 32, May 1983, p. 193-202.
Physics
27
Earth Mantle, Garnets, Geochemistry, Liquidus, Mineralogy, Peridotite, Solidus, Crystallization, Magma, Olivine, Petrology, Pyroxenes
Scientific paper
Strong convergence is noted, in experimental data for systems pertaining to anhydrous fertile garnet-lherzolite in the 6.5-15 GPa range, either to a common temperature or to temperatures differing by only about 100 C. The major element composition of magmas generated by even minor degrees of partial melting may be similar to the composition of the primordial, bulk silicate earth in an upper mantle stratigraphic column more than 160 km deep. Whether or not the solidus and liquidus intersect, the liquidus mineralogy for undepleted garnet-lherzolite compositions is found to change from olivine, at low pressures, to pyroxene, garnet, or a solid solution of both, at pressures greater than 10-15 GPa.
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