TY - JOUR
T1 - The role of water in the deep upper mantle and transition zone
T2 - dehydration of stagnant slabs and its effects on the big mantle wedge
AU - Ohtani, E.
AU - Zhao, D.
N1 - Funding Information:
Acknowledgements. We appreciate T. Kuritani for useful discussions on dehydration of subducting slabs. We also thank Oleg Safonov and an anonymous reviewer for their critical reviews to improve the manuscript. This work was supported by the grants-in-aid of Scientific Research from the Ministry of Education, Culture, Science, Sport, and Technology of the Japanese Government to EO and DZ, and the Global–COE program of Tohoku University, Global Research and Education Center for the Earth and Planetary Dynamics.
PY - 2009/12
Y1 - 2009/12
N2 - Mineral physics data related to the deep dehydration of stagnant slabs are summarized. The hydrogen diffusion in minerals of the mantle transition zone is not fast enough to homogenize the transition zone on the geological time scale, and hydrogen is expected to be unevenly distributed there. The hydrous fluid formed in the transition zone tends to percolate into shallower depths to form gravitationally stable hydrous magmas at the base of the upper mantle. We need further studies on the relation of intraplate volcanism above the stagnant slab and deep dehydration, because we expect the geochemical fingerprints of deep dehydration to be quite different from those of shallow dehydration from the subducting slabs.
AB - Mineral physics data related to the deep dehydration of stagnant slabs are summarized. The hydrogen diffusion in minerals of the mantle transition zone is not fast enough to homogenize the transition zone on the geological time scale, and hydrogen is expected to be unevenly distributed there. The hydrous fluid formed in the transition zone tends to percolate into shallower depths to form gravitationally stable hydrous magmas at the base of the upper mantle. We need further studies on the relation of intraplate volcanism above the stagnant slab and deep dehydration, because we expect the geochemical fingerprints of deep dehydration to be quite different from those of shallow dehydration from the subducting slabs.
KW - diffusion
KW - hydrogen
KW - mantle
KW - subduction slabs
UR - http://www.scopus.com/inward/record.url?scp=70449753161&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=70449753161&partnerID=8YFLogxK
U2 - 10.1016/j.rgg.2009.11.006
DO - 10.1016/j.rgg.2009.11.006
M3 - Article
AN - SCOPUS:70449753161
SN - 1068-7971
VL - 50
SP - 1073
EP - 1078
JO - Russian Geology and Geophysics
JF - Russian Geology and Geophysics
IS - 12
ER -