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Water‐induced convection in the Earth's mantle transition zone
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| Zeitschriftentitel: | Journal of Geophysical Research: Solid Earth |
|---|---|
| Personen und Körperschaften: | , |
| In: | Journal of Geophysical Research: Solid Earth, 114, 2009, B1 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
|
| Schlagwörter: |
| author_facet |
Richard, Guillaume C. Bercovici, David Richard, Guillaume C. Bercovici, David |
|---|---|
| author |
Richard, Guillaume C. Bercovici, David |
| spellingShingle |
Richard, Guillaume C. Bercovici, David Journal of Geophysical Research: Solid Earth Water‐induced convection in the Earth's mantle transition zone Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
| author_sort |
richard, guillaume c. |
| spelling |
Richard, Guillaume C. Bercovici, David 0148-0227 American Geophysical Union (AGU) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics http://dx.doi.org/10.1029/2008jb005734 <jats:p>Water enters the Earth's mantle by subduction of oceanic lithosphere. Most of this water immediately returns to the atmosphere through arc volcanism, but a part of it is expected as deep as the mantle transition zone (410–660 km depth). There, slabs can be deflected and linger before sinking into the lower mantle. Because it lowers the density and viscosity of the transition zone minerals (i.e., wadsleyite and ringwoodite), water is likely to affect the dynamics of the transition zone mantle overlying stagnant slabs. The consequences of water exchange between a floating slab and the transition zone are investigated. In particular, we focus on the possible onset of small‐scale convection despite the adverse thermal gradient (i.e., mantle is cooled from below by the slab). The competition between thermal and hydrous effects on the density and thus on the convective stability of the top layer of the slab is examined numerically, including water‐dependent density and viscosity and temperature‐dependent water solubility. For plausible initial water content in a slab (≥0.5 wt %), an episode of convection is likely to occur after a relatively short time delay (5–20 Ma) after the slab enters the transition zone. However, water induced rheological weakening is seen to be a controlling parameter for the onset time of convection. Moreover, small‐scale convection above a stagnant slab greatly enhances the rate of slab dehydration. Small‐scale convection also facilitates heating of the slab, which in itself may prolong the residence time of the slab in the transition zone.</jats:p> Water‐induced convection in the Earth's mantle transition zone Journal of Geophysical Research: Solid Earth |
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10.1029/2008jb005734 |
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Online Free |
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Geologie und Paläontologie Geographie Chemie und Pharmazie Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft Biologie Allgemeine Naturwissenschaft Physik Technik |
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| title |
Water‐induced convection in the Earth's mantle transition zone |
| title_unstemmed |
Water‐induced convection in the Earth's mantle transition zone |
| title_full |
Water‐induced convection in the Earth's mantle transition zone |
| title_fullStr |
Water‐induced convection in the Earth's mantle transition zone |
| title_full_unstemmed |
Water‐induced convection in the Earth's mantle transition zone |
| title_short |
Water‐induced convection in the Earth's mantle transition zone |
| title_sort |
water‐induced convection in the earth's mantle transition zone |
| topic |
Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
| url |
http://dx.doi.org/10.1029/2008jb005734 |
| publishDate |
2009 |
| physical |
|
| description |
<jats:p>Water enters the Earth's mantle by subduction of oceanic lithosphere. Most of this water immediately returns to the atmosphere through arc volcanism, but a part of it is expected as deep as the mantle transition zone (410–660 km depth). There, slabs can be deflected and linger before sinking into the lower mantle. Because it lowers the density and viscosity of the transition zone minerals (i.e., wadsleyite and ringwoodite), water is likely to affect the dynamics of the transition zone mantle overlying stagnant slabs. The consequences of water exchange between a floating slab and the transition zone are investigated. In particular, we focus on the possible onset of small‐scale convection despite the adverse thermal gradient (i.e., mantle is cooled from below by the slab). The competition between thermal and hydrous effects on the density and thus on the convective stability of the top layer of the slab is examined numerically, including water‐dependent density and viscosity and temperature‐dependent water solubility. For plausible initial water content in a slab (≥0.5 wt %), an episode of convection is likely to occur after a relatively short time delay (5–20 Ma) after the slab enters the transition zone. However, water induced rheological weakening is seen to be a controlling parameter for the onset time of convection. Moreover, small‐scale convection above a stagnant slab greatly enhances the rate of slab dehydration. Small‐scale convection also facilitates heating of the slab, which in itself may prolong the residence time of the slab in the transition zone.</jats:p> |
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| author | Richard, Guillaume C., Bercovici, David |
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| description | <jats:p>Water enters the Earth's mantle by subduction of oceanic lithosphere. Most of this water immediately returns to the atmosphere through arc volcanism, but a part of it is expected as deep as the mantle transition zone (410–660 km depth). There, slabs can be deflected and linger before sinking into the lower mantle. Because it lowers the density and viscosity of the transition zone minerals (i.e., wadsleyite and ringwoodite), water is likely to affect the dynamics of the transition zone mantle overlying stagnant slabs. The consequences of water exchange between a floating slab and the transition zone are investigated. In particular, we focus on the possible onset of small‐scale convection despite the adverse thermal gradient (i.e., mantle is cooled from below by the slab). The competition between thermal and hydrous effects on the density and thus on the convective stability of the top layer of the slab is examined numerically, including water‐dependent density and viscosity and temperature‐dependent water solubility. For plausible initial water content in a slab (≥0.5 wt %), an episode of convection is likely to occur after a relatively short time delay (5–20 Ma) after the slab enters the transition zone. However, water induced rheological weakening is seen to be a controlling parameter for the onset time of convection. Moreover, small‐scale convection above a stagnant slab greatly enhances the rate of slab dehydration. Small‐scale convection also facilitates heating of the slab, which in itself may prolong the residence time of the slab in the transition zone.</jats:p> |
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| spelling | Richard, Guillaume C. Bercovici, David 0148-0227 American Geophysical Union (AGU) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics http://dx.doi.org/10.1029/2008jb005734 <jats:p>Water enters the Earth's mantle by subduction of oceanic lithosphere. Most of this water immediately returns to the atmosphere through arc volcanism, but a part of it is expected as deep as the mantle transition zone (410–660 km depth). There, slabs can be deflected and linger before sinking into the lower mantle. Because it lowers the density and viscosity of the transition zone minerals (i.e., wadsleyite and ringwoodite), water is likely to affect the dynamics of the transition zone mantle overlying stagnant slabs. The consequences of water exchange between a floating slab and the transition zone are investigated. In particular, we focus on the possible onset of small‐scale convection despite the adverse thermal gradient (i.e., mantle is cooled from below by the slab). The competition between thermal and hydrous effects on the density and thus on the convective stability of the top layer of the slab is examined numerically, including water‐dependent density and viscosity and temperature‐dependent water solubility. For plausible initial water content in a slab (≥0.5 wt %), an episode of convection is likely to occur after a relatively short time delay (5–20 Ma) after the slab enters the transition zone. However, water induced rheological weakening is seen to be a controlling parameter for the onset time of convection. Moreover, small‐scale convection above a stagnant slab greatly enhances the rate of slab dehydration. Small‐scale convection also facilitates heating of the slab, which in itself may prolong the residence time of the slab in the transition zone.</jats:p> Water‐induced convection in the Earth's mantle transition zone Journal of Geophysical Research: Solid Earth |
| spellingShingle | Richard, Guillaume C., Bercovici, David, Journal of Geophysical Research: Solid Earth, Water‐induced convection in the Earth's mantle transition zone, Paleontology, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Earth-Surface Processes, Geochemistry and Petrology, Soil Science, Water Science and Technology, Ecology, Aquatic Science, Forestry, Oceanography, Geophysics |
| title | Water‐induced convection in the Earth's mantle transition zone |
| title_full | Water‐induced convection in the Earth's mantle transition zone |
| title_fullStr | Water‐induced convection in the Earth's mantle transition zone |
| title_full_unstemmed | Water‐induced convection in the Earth's mantle transition zone |
| title_short | Water‐induced convection in the Earth's mantle transition zone |
| title_sort | water‐induced convection in the earth's mantle transition zone |
| title_unstemmed | Water‐induced convection in the Earth's mantle transition zone |
| topic | Paleontology, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Earth-Surface Processes, Geochemistry and Petrology, Soil Science, Water Science and Technology, Ecology, Aquatic Science, Forestry, Oceanography, Geophysics |
| url | http://dx.doi.org/10.1029/2008jb005734 |