Water in Earth's Lower Mantle

  title={Water in Earth's Lower Mantle},
  author={M. Murakami and K. Hirose and H. Yurimoto and S. Nakashima and N. Takafuji},
  pages={1885 - 1887}
Secondary ion mass spectrometry measurements show that Earth's representative lower mantle minerals synthesized in a natural peridotitic composition can dissolve considerable amounts of hydrogen. Both MgSiO3-rich perovskite and magnesiowüstite contain about 0.2 weight percent (wt%) H2O, and CaSiO3-rich perovskite contains about 0.4 wt% H2O. The OH absorption bands in Mg-perovskite and magnesiowüstite were also confirmed with the use of infrared microspectroscopic measurements. Earth's lower… Expand
Water solubility in majoritic garnet in subducting oceanic crust
[1] Water in majoritic garnet synthesized in the mid-oceanic ridge basalt (MORB) + H2O composition at 20 GPa and 1400–1500°C was measured by secondary ion mass spectrometry (SIMS) and infraredExpand
Water in the Earth’s Lower Mantle
All major, rock-forming lower-mantle minerals (bridgmanite, CaSi-perovskite, ferropericlase and stishovite) are “nominally anhydrous minerals” (NAMs), in which hydrogen comprises less than 1 wt % andExpand
Water in the Earth’s Lower Mantle
All major, rock-forming lower-mantle minerals (bridgmanite, CaSi-perovskite, ferropericlase and stishovite) are “nominally anhydrous minerals” (NAMs), in which hydrogen comprises less than 1 wt % andExpand
Water in the Earth’s mantle
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Hydrogen in High Pressure Silicate and Oxide Mineral Structures
Earth is the water planet. Liquid water covers more than 70% of the surface and dominates all surface processes, geological, meteorological, and biological. However the hydrosphere composes onlyExpand
Water in the mantle
Subducting slabs transport water stored in hydrous minerals into the transition zone and lower mantle. The water storage capacity of the upper and lower mantles is less than 0.2 wt%. The transitionExpand
Mineralogy of the Earth: Trace Elements and Hydrogen in the Earth's Transition Zone and Lower Mantle
We review the experimental and theoretical constraints on the distribution of trace elements in the transition zone and lower mantle, with particular emphasis on refractory lithophile elements and HExpand
Partitioning of water during melting of the Earth's upper mantle at H2O-undersaturated conditions
We present the results of an experimental study of the partitioning of water between common upper mantle minerals (olivine, orthopyroxene, clinopyroxene, garnet) and silicate melt, consisting of 352Expand
Effect of hydration on the elasticity of mantle minerals and its geophysical implications
Recent studies have shown that major nominally anhydrous minerals in the Earth’s mantle, such as olivine, pyroxene and garnet, can incorporate considerable amounts of water as structurally boundExpand
Dry (Mg,Fe)SiO3 perovskite in the Earth's lower mantle
Combined synthesis experiments and first-principles calculations show that MgSiO3-perovskite with minor Al or Fe does not incorporate significant OH under lower mantle conditions. Perovskite,Expand


Water in Earth's Mantle: The Role of Nominally Anhydrous Minerals
Nominally anhydrous minerals constitute a significant reservoir for mantle hydrogen, possibly accommodating all water in the depleted mantle and providing a possible mechanism to recycle water from Earth's surface into the deep mantle. Expand
A Lesson from Ceramics
Understanding the processes in Earth9s lower mantle requires detailed knowledge of the composition, phase, and physical properties of the mantle minerals, chiefly magnesium silicates with aExpand
Mineralogy and dynamics of a pyrolite lower mantle
There is a growing consensus that the Earth's lower mantle possesses a bulk composition broadly similar to that of the upper mantle (known as pyrolite). But little is known about lower-mantleExpand
Hydrogen partitioning into molten iron at high pressure: implications for Earth's core
  • Okuchi
  • Chemistry, Medicine
  • Science
  • 1997
To determine whether hydrogen can account for a major part of the density deficit and is therefore an important constituent in the molten iron outer core, the hydrogen concentration in molten iron was measured and the metal-silicate melt partitioning coefficient of hydrogen was determined as a function of temperature. Expand
Hydrogen in the Deep Earth
▪ Abstract The mechanisms of exchange of hydrogen between the deep interior and surface of Earth, as well as the means of retention and possible abundance of hydrogen deep within the Earth, areExpand
Perovskite as a possible sink for ferric iron in the lower mantle
The lower mantle constitutes more than half the Earth's interior by volume, and is believed to consist predominantly of (Mg,Fe)SiO3 perovskite with up to approximately 20% (Mg,Fe)O. In the systemExpand
Decomposition of phase D in the lower mantle and the fate of dense hydrous silicates in subducting slabs
AbstractHigh pressure, high temperature quench-type experiments were carried out on serpentine to pressures of 53 GPa andtemperatures between 800–1800oC. X-ray analyses show that recovered phaseExpand
Water in minerals? A peak in the infrared
The study of water in minerals with infrared spectroscopy is reviewed with emphasis on natural and synthetic quartz. Water can be recognized in minerals as fluid inclusions and as isolated moleculesExpand
Water partitioning between nominally anhydrous minerals in the MgO–SiO2–H2O system up to 24 GPa: implications for the distribution of water in the Earth’s mantle
Multi-anvil experiments have been conducted in the MgO–SiO2–H2O system at pressures of 15–24 GPa and temperatures of 1200–1600°C to investigate the partitioning of water between mantle phases. TheExpand
In situ measurements of the phase transition boundary in Mg3Al2Si3O12: implications for the nature of the seismic discontinuities in the Earth’s mantle
Abstract Here we report the phase boundary of pyrope garnet (Mg3Al2Si3O12) to Al-bearing silicate perovskite plus corundum, with the highest transition pressure determined by in situ measurements inExpand