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- Marc M. Hirschmann
- Department of Geology and Geophysics, University of Minnesota, Minneapolis, Minnesota 55455-0219;
書誌事項
- 公開日
- 2006-05-01
- DOI
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- 10.1146/annurev.earth.34.031405.125211
- 公開者
- Annual Reviews
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説明
<jats:p> Hydrous melting driven by changes in H<jats:sub>2</jats:sub>O storage capacity may occur in a variety of settings in the mantle, including in oceanic basalt sources and in deeper regions above and below the transition zone. The 50–200 ppm H<jats:sub>2</jats:sub>O in the upper mantle likely derives from a blend of sources that may include residues of hydrous partial melting, either in the deep mantle and/or beneath arcs or oceanic islands. Relative to the large storage capacity in the transition zone, low storage capacities above and below may lead to hydrous melting for material upwelling through 410 km or downwelling through 670 km. The apparently very low storage capacity of the lower mantle (<20 ppm H<jats:sub>2</jats:sub>O) may force melting even if downwelling rocks have normal upper mantle H<jats:sub>2</jats:sub>O (50–200 ppm) concentrations. Very low storage capacity in the lower mantle, if verified experimentally, presents a challenge to the view that the H<jats:sub>2</jats:sub>O-rich sources of oceanic island basalts reside in the lower mantle. </jats:p>
収録刊行物
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- Annual Review of Earth and Planetary Sciences
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Annual Review of Earth and Planetary Sciences 34 (1), 629-653, 2006-05-01
Annual Reviews
