The single-crystal e astic properties of a hydrous ilicate gamet, hibschite (Ca3A12(SiO4)l.72(H404)l.28), were measured using Brillouin spectroscopic techniques. The adiabatic bulk modulus of hibschite, K s = 99.8+1.0 GPa, and the shear modulus, •t = 64.3_--/-0.5 GPa, are 40% lower than the bulk and shear moduli for anhydrous grossular gamet Ca3A12(SiO4) 3. This increased compressibility of hyd...

Hydrous components in the nominally anhydrous minerals were first of significance for their impact on the mechanical strength of minerals and on the dielectric properties of synthetic materials. They are now known to influence a large number of chemical and physical properties of the host mineral and are thought to be an important contribution to the Earth’s water cycle. Detection, and concentr...

Hydrous pyrolysis experiments conducted on Messel shale with D2O demonstrated that a large amount of deuterium becomes incorporated into the hydrocarbons generated from the shale kerogen. In order to understand the pathway of deuterium (and protium) exchange and the role of water during hydrous pyrolysis, we conducted a series of experiments using aliphatic compounds (1,13-tetradecadiene, 1-hex...

Phase diagrams of hydrous mid-ocean ridge (MOR) basalts to 330 km depth and of hydrous peridotites to 250 km depth are compiled for conditions characteristic for subduction zones. A synthesis of our experimentally determined phase relations of chlorite, lawsonite, epidote-zoisite, amphibole, paragonite, chloritoid, talc, and phengite in basalts and of phase relations from the literature of serp...

This experimental study examines the mineral/ melt partitioning of incompatible trace elements among high-Ca clinopyroxene, garnet, and hydrous silicate melt at upper mantle pressure and temperature conditions. Experiments were performed at pressures of 1.2 and 1.6 GPa and temperatures of 1,185 to 1,370 C. Experimentally produced silicate melts contain up to 6.3 wt% dissolved H2O, and are satur...

Sylvia-Monique Thomas*, Steven D. Jacobsen, Craig R. Bina, Patrick Reichart, Marcus Moser, Erik H. Hauri, Monika Koch-Müller, Joseph R. Smyth and Günther Dollinger 1 Department of Geoscience, University of Nevada Las Vegas, Las Vegas, NV, USA 2 Department of Earth and Planetary Sciences, Northwestern University, Evanston, IL, USA 3 Department für Luftund Raumfahrttechnik LRT2, Universität der B...

The presence of hydrogen can affect elastic properties and seismic velocities of minerals in the Earth's upper mantle. In this study, the secondorder elastic constants of hydrous wadsleyites containing 0.37, 0.84, and 1.66 wt.% H2O were determined by Brillouin scattering at ambient conditions. Measurements were performed on at least three independent crystal planes for each composition. The agg...