[iris-bulk] Fall AGU Session T25 on H2O Recycling in the Earth

[Tai-Lin Ellen Tseng]

Dear Colleagues:

Joe Smyth, Wang-Ping Chen and I are convening Special Session T25 at 
the Fall AGU in which we ask the question whether H2O is being 
subducted into the mantle transition zone or deeper.  If you have 
direct observational evidence bearing on this question or 
experimental evidence that can be connected to current or future 
evidence within Earth, we urge you to consider submitting to our 
session.  The session description follows.

Fall AGU Session T25

Title: "Is Water Being Recycled into the Deep Mantle? If so, how?"

Convenors:
Harry W. Green, II, University of California, Riverside
Joseph R. Smyth, University of Colorado
Wang-Ping Chen, University of Illinois, Champagne-Urbana

Description:  It is clear that, experimentally, large amounts of H2O 
can be dissolved as hydroxyl into nominally anhydrous olivine and its 
high-pressure polymorphs and even more can be incorporated into the 
Dense Hydrous Magnesium Silicates (DHMS). There is therefore a 
possibility of cycling large amounts of H2O into the deep mantle, to 
depths of the transition zone or below.  This session will examine 
the evidence for and against such recycling in the earth and the 
possible mechanisms by which the H2O is (or is not) being transported 
from the surface. Experimental and observational contributions from 
diverse disciplines (including but not limited to mineral/rock 
physics, seismology, tectonics, petrology) are welcomed but in all 
cases it is requested that participants address verifiable evidence 
and testable hypotheses under realistic conditions in Earth.


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Dr. Harry W. Green, II
Distinguished Professor of Geology and Geophysics
Director, Central Facility for Advanced Microscopy and Microanalysis 
(CFAMM)
Institute of Geophysics and Planetary Physics
University of California
Riverside, CA 92521
Tel: (951) 827-4505
Fax: (951) 827-4324
email: harry.green at ucr.edu
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