The petrogenesis of peridotitic komatiites: Evidence from high-pressure melting experiments

Details The petrogenesis of peridotitic komatiites: Evidence from high-pressure melting experiments The petrogenesis of peridotitic komatiites: Evidence from high-pressure melting experiments

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..37...97b&link_type=abstract

Earth and Planetary Science Letters, Volume 37, Issue 1, p. 97-106.

Computer Science

24

Scientific paper

The compositions of liquidus olivines and orthopyroxenes of natural specimens of spinifex- and quench-textured peridotitic komatiites from the Belingwe Greenstone Belt, Rhodesia have been determined for pressures between 10 and 40 kbars. In conjunction with the chemical variation exhibited by these peridotitic komatiites it is concluded that the more magnesian lavas cannot be derived by concentration of olivine phenocrysts, fractional crystallisation or equilibrium partial melting. The peridotitic komatiites could evolve by polybaric assimilation and complete melting of garnet lherzolite into an initial liquid containing about 24% MgO.

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