Experimental evidence for the exsolution of cratonic peridotite from high-temperature harzburgite

Details Experimental evidence for the exsolution of cratonic peridotite from high-temperature harzburgite Experimental evidence for the exsolution of cratonic peridotite from high-temperature harzburgite

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.106...64c&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 106, no. 1-4, Sept. 1991, p. 64-72.

Computer Science

18

Cratons, Geochemistry, High Temperature Tests, Peridotite, Pyroxenes, Earth Mantle, Garnets, Geochronology

Scientific paper

Results are presented of phase equilibrium experiments performed on typical 'oceanic' and 'cratonic' peridotite compositions and a Ca, Al-rich orthopyroxene composition to test the hypothesis that garnet lherzolites exsolved from high-temperature harzburgites, and also to further the understanding of the origin of ancient cratonic lithospheres. The complete solution of garnet and clinopyroxene into orthopyroxene observed in all three starting compositions at temperatures near or above the mantle solidus at pressures less than 6 GPa supports the hypothesis that garnet lherzolite could have exsolved from harzburgite. The inferred cooling path for the original high-temperature harzburgite protoliths of garnet lherzolites differs depending on bulk composition. Phase equlilibria and compositional relationships for orthopyroxenes produced in phase equilibrium experiments on peridotite and komatiite are consistent with an origin for cratonic peridotite as a residue of Archean komatiite extraction, which has since cooled and exsolved clinopyroxene and garnet to become the common low-temperature coarse-grained peridotite thought to comprise the bulk of the mantle lithosphere beneath the Archean Kaapvaal craton.

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