Journal ArticleDOI
Water in Earth's Mantle: The Role of Nominally Anhydrous Minerals
David R. Bell,George R. Rossman +1 more
TLDR
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.Abstract:
Most minerals of Earth's upper mantle contain small amounts of hydrogen, structurally bound as hydroxyl (OH). The OH concentration in each mineral species is variable, in some cases reflecting the geological environment of mineral formation. Of the major mantle minerals, pyroxenes are the most hydrous, typically containing ∼200 to 500 parts per million H_2O by weight, and probably dominate the water budget and hydrogen geochemistry of mantle rocks that do not contain a hydrous phase. Garnets and olivines commonly contain ∼1 to 50 parts per million. 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.read more
Citations
More filters
Journal ArticleDOI
The composition of the Earth
William F. McDonough,Shen-Su Sun +1 more
TL;DR: In this paper, the authors compared the relative abundances of the refractory elements in carbonaceous, ordinary, and enstatite chondritic meteorites and found that the most consistent composition of the Earth's core is derived from the seismic profile and its interpretation, compared with primitive meteorites, and chemical and petrological models of peridotite-basalt melting relationships.
Journal ArticleDOI
Rheology of the Upper Mantle: A Synthesis
Shun-ichiro Karato,Patrick Wu +1 more
TL;DR: A synthesis of laboratory studies and geophysical and geological observations shows that transitions between diffusion and dislocation creep likely occur in the Earth's upper mantle.
Journal ArticleDOI
Water in the oceanic upper mantle: implications for rheology, melt extraction and the evolution of the lithosphere
Greg Hirth,David L. Kohlstedt +1 more
TL;DR: In this paper, the influence of water on the dynamics of the oceanic upper mantle is re-evaluated based on recent experimental constraints on the solubility of water in mantle minerals and earlier experimental studies of olivine rheology.
Journal ArticleDOI
Source regions and timescales for the delivery of water to the Earth
Alessandro Morbidelli,John Chambers,Jonathan I. Lunine,J. M. Petit,F. Robert,Giovanni B. Valsecchi,K. E. Cyr +6 more
TL;DR: In this paper, the authors investigated the origin of Earth's water of dynamical models of primordial evolution of solar system bodies and check them with respect to chemical constraints, finding that it is plausible that the Earth accreted water all along its formation, from early phases when the solar nebula was still present to the late stages of gas-free sweepup of scattered planetesimals.
Journal ArticleDOI
Water-Induced Fabric Transitions in Olivine
TL;DR: It is shown that when a large amount of water is added to olivine, the relation between flow geometry and seismic anisotropy undergoes marked changes.
References
More filters
Book
The chemical evolution of the atmosphere and oceans
TL;DR: Holland et al. as mentioned in this paper reconstruct the chemical evolution of the Earth's atmosphere and oceans using data from a wide spectrum of fields to trace the history of the ocean-atmosphere system.
Journal ArticleDOI
Mantle plumes from ancient oceanic crust
TL;DR: In this article, the authors propose a model for the origin of hot-spot volcanism, where oceanic crust is returned to the mantle during subduction and sinks into the deeper mantle and accumulates at some level of density compensation, possibly the core-mantle boundary.
Journal ArticleDOI
Fluid processes in subduction zones.
TL;DR: The location and conse-quences of fluid production in subduction zones can be constrained by consideration of phase diagrams for relevant bulk compositions in conjunction with fluid and rock pressure-temperature-time paths predicted by numerical heat-transfer models.
Journal ArticleDOI
Rheology of synthetic olivine aggregates: Influence of grain size and water
TL;DR: In this paper, the influence of grain size and water content on the high-temperature plasticity of olivine aggregates was studied, using a gas medium high-pressure deformation apparatus.
Journal ArticleDOI
The determination of hydroxyl by infrared absorption in quartz, silicate glasses and similar materials
TL;DR: In this article, a relation between the coefficient d'absorption molaire integral integral (I/γ) and I/γ = 150(3 780 v) is presented.
Related Papers (5)
Water in the oceanic upper mantle: implications for rheology, melt extraction and the evolution of the lithosphere
Greg Hirth,David L. Kohlstedt +1 more