Water transport into the deep mantle and formation of a hydrous transition zone

Details Water transport into the deep mantle and formation of a hydrous transition zone Water transport into the deep mantle and formation of a hydrous transition zone

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pepi..143..255o&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 143, p. 255-269.

Physics

61

Scientific paper

The phase relations in the peridotite-water system to the top of the lower mantle reveal that a certain amount of water can be transported and stored in the transition zone by various hydrous minerals resulting in formation of a hydrous transition zone. Results of preliminary experiments to clarify the effect of water on kinetics of the olivine-wadsleyite transformation are given, and show that water enhances the transformation kinetics significantly.
There are potential dehydration sites in the deep mantle; four sites along the descending slabs depending on their temperature profiles, i.e., the mantle wedge of the subduction zone, mantle transition zone, top of the lower mantle where hydrous ringwoodite and superhydrous phase B decompose, and deep in the lower mantle around 1200-1500km depth where decomposition of phase D(G) occurs. We also expect one site of dehydration melting at the base of the upper mantle where the hot mantle plume hydrated in the transition zone can be dehydrated. The transition zone can serve as a water absorber for the mantle scale water circulation system.
Some of the recent seismic works including the P-wave tomography images reveal the existence of low velocity anomalies in the transition zone suggesting possibly a wet transition zone. Elevation of the 410km discontinuity and lack of clear evidence for a metastable olivine wedge in cold slabs may be consistent with the equilibrium phase transformation from olivine to wadsleyite in cold and wet slabs on the basis of our kinetic study of the transformation under wet conditions.

Affiliated with

Also associated with

No associations

Rating

Water transport into the deep mantle and formation of a hydrous transition zone 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 Water transport into the deep mantle and formation of a hydrous transition zone, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Water transport into the deep mantle and formation of a hydrous transition zone will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1393719