The role of water in the deep upper mantle and transition zone: dehydration of stagnant slabs and its effects on the big mantle wedge

E. Ohtani, D. Zhao

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1073-1078
Number of pages6
JournalRussian Geology and Geophysics
Volume50
Issue number12
DOIs
Publication statusPublished - 2009 Dec 1

Keywords

  • diffusion
  • hydrogen
  • mantle
  • subduction slabs

ASJC Scopus subject areas

  • Geophysics
  • Geology

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