Water partitioning in the Earth's mantle

Details Water partitioning in the Earth's mantle Water partitioning in the Earth's mantle

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010pepi..183..245i&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 183, Issue 1-2, p. 245-251.

Physics

4

Scientific paper

We have conducted H 2 O partitioning experiments between wadsleyite and ringwoodite and between ringwoodite and perovskite at 1673 K and 1873 K, respectively. These experiments were performed in order to constrain the relative distribution of H 2 O in the upper mantle, the mantle transition zone, and the lower mantle. We successfully synthesized coexisting mineral assemblages of wadsleyite-ringwoodite and ringwoodite-perovskite that were large enough to measure the H 2 O contents by secondary ion mass spectrometry (SIMS). Combining our previous H 2 O partitioning data ( Chen et al., 2002 ) with the present results, the determined water partitioning between olivine, wadsleyite, ringwoodite, and perovskite under H 2 O-rich fluid saturated conditions are 6:30:15:1, respectively. Because the maximum H 2 O storage capacity in wadsleyite is ˜3.3 wt% (e.g. Inoue et al., 1995 ), the possible maximum H 2 O storage capacity in the olivine high-pressure polymorphs are as follows: ˜0.7 wt% in olivine (upper mantle just above 410 km depth), ˜3.3 wt% in wadsleyite (410-520 km depth), ˜1.7 wt% in ringwoodite (520-660 km depth), and ˜0.1 wt% in perovskite (lower mantle). If we assume ˜0.2 wt% of the H 2 O content in wadsleyite in the mantle transition zone estimated by recent electrical conductivity measurements (e.g. Dai and Karato, 2009 ), the estimated H 2 O contents throughout the mantle are as follows; ˜0.04 wt% in olivine (upper mantle just above 410 km depth), ˜0.2 wt% in wadsleyite (410-520 km depth), ˜0.1 wt% in ringwoodite (520-660 km depth) and ˜0.007 wt% in perovskite (lower mantle). Thus, the mantle transition zone should contain a large water reservoir in the Earth's mantle compared to the upper mantle and the lower mantle.

Affiliated with

Also associated with

No associations

Rating

Water partitioning in the Earth's mantle 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 partitioning in the Earth's mantle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Water partitioning in the Earth's mantle will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1533023