Melting in an Archaean mantle plume - Heads it's basalts, tails it's komatiites

Details Melting in an Archaean mantle plume - Heads it's basalts, tails it's komatiites Melting in an Archaean mantle plume - Heads it's basalts, tails it's komatiites

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.339..697c&link_type=abstract

Nature (ISSN 0028-0836), vol. 339, June 29, 1989, p. 697-699.

Physics

78

Basalt, Earth Mantle, Geochronology, Melting, Magma, Plumes, Temperature Distribution

Scientific paper

It is argued here that both the basalts and the komatiites in the lower part of most Archaean greenstone sequences are produced by a starting thermal plume rising in a warmer Archaean mantle. Fluid-dynamics studies show that a starting plume consists of a hot axial jet capped by a large head into which cooler surrounding mantle is entrained. Calculations for such a flow are presented which indicate that komatiite could form by melting in the high-temperature axis of the plume and basalts could form by melting in the cooler head. The sudden onset and limited duration of the basalt/komatiite sequences, seen in the greenstone belts of Western Australia and elsewhere, are explained by this model.

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