The Eclogite-Garnetite transformation in the MORB + H2O system

Details The Eclogite-Garnetite transformation in the MORB + H2O system The Eclogite-Garnetite transformation in the MORB + H2O system

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pepi..146..283o&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 146, Issue 1-2, p. 283-296.

Physics

12

Scientific paper

To decipher phase relations of oceanic crust in the coldest slab at the mantle transition zone, multi-anvil experiments were conducted in the MORB+H2O system at pressures of 10-19GPa, and temperatures of 700-1500°C. Garnet and stishovite were recognized in all run charges. Above 15GPa, garnet drastically increases NaSi (Na2MSi5O12) component (M = Ca, Mg, Fe2+), jadeite occurs instead of omphacite. Na-, K-hollandite containing 7mol% NaAlSi3O8 and Ca-perovskite with 60mol% CaTiO3, were observed at P>17GPa. With decomposition of omphacite and increase of modal ratio of garnet, there is a sharp increase of density at 440km. The density increase due to appearance of Ca-perovskite at 570km, is estimated approximately 100km shallower than that of previous estimation.

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