Effects of iron and magnetite additions in olivine-pyroxene rheology

Details Effects of iron and magnetite additions in olivine-pyroxene rheology Effects of iron and magnetite additions in olivine-pyroxene rheology

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...55..277h&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 55, Issue 3-4, p. 277-291.

Physics

26

Scientific paper

Stress-strain tests have been carried out at 300 MPa confining pressure and 1500 K temperature on synthetic aggregates of olivine and orthopyroxene to which small amounts of iron or magnetite have been added, as well as on olivine-orthopyroxene mixtures, all in iron jackets. For both olivine and orthopyroxene, the addition of iron results in either no significant change or a slight increase in flow stress, while addition of magnetite leads to a substantial weakening. The mixtures of olivine and orthopyroxene appear to be slightly weaker than the end-members. In the case of iron and magnetite addition, it is concluded that changes in oxygen fugacity rather than iron/magnesium ratio are probably the more important factor in causing the changes of strength, through changes in the departures from stoichiometry.

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