High pressure crystal chemistry of hydrous ringwoodite and water in the Earth's interior

Details High pressure crystal chemistry of hydrous ringwoodite and water in the Earth's interior High pressure crystal chemistry of hydrous ringwoodite and water in the Earth's interior

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pepi..143..271s&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 143, p. 271-278.

Physics

15

Scientific paper

The crystal chemistry of Fo90 hydrous ringwoodite (Mg1.7Fe0.22H0.15SiO4) containing 0.93% H2O by weight has been studied at pressures up to 11.2GPa by single-crystal X-ray diffraction in the diamond anvil cell. The unit cell edge and volume have been refined at 20 different pressures in this pressure range. The refined bulk modulus for the unit cell is 169.0+/-3.4GPa with a K' of 7.9+/-0.9. H is accommodated in the structure principally by octahedral cation vacancy. The oxygen position parameter has been refined from X-ray intensity data at 10 pressures over this range. With a K' fixed at 4.0, the bulk modulus of the Si tetrahedron is 245+/-31GPa and that of the octahedral site is 150+/-7GPa. Consistent with a previous study, we observe a systematic decrease of bulk modulus with H-content. From these data, it appears that hydration of ringwoodite has a larger effect on seismic velocity than temperature within the possible ranges of these parameters under upper mantle conditions. This means that in tomographic images of the Transition Zone in regions distant from subduction zones, blue is more likely to mean `dry' than it is to mean `cold'. Observed seismic velocities in the Transition Zone are consistent with significant hydration of the ringwoodite (γ-(Mg, Fe)2SiO4) structure.

Affiliated with

Also associated with

No associations

Rating

High pressure crystal chemistry of hydrous ringwoodite and water in the Earth's interior does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with High pressure crystal chemistry of hydrous ringwoodite and water in the Earth's interior, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High pressure crystal chemistry of hydrous ringwoodite and water in the Earth's interior will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1393721