A5079935103- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Geochemistry and Geologic Mapping
- earthquake and tectonic studies
- Hydrocarbon exploration and reservoir analysis
- Glass properties and applications
- Geological Studies and Exploration
- Geology and Paleoclimatology Research
- Advanced ceramic materials synthesis
- Metallurgical Processes and Thermodynamics
- Material Dynamics and Properties
- Field-Flow Fractionation Techniques
- Thermochemical Biomass Conversion Processes
- Recycling and utilization of industrial and municipal waste in materials production
- Methane Hydrates and Related Phenomena
- Geochemistry and Elemental Analysis
- Cultural Heritage Materials Analysis
- Archaeology and Historical Studies
- Geomagnetism and Paleomagnetism Studies
- Coal and Its By-products
- Microwave Dielectric Ceramics Synthesis
- Geological and Geophysical Studies Worldwide
- Crystal Structures and Properties
- Clay minerals and soil interactions
- Phase-change materials and chalcogenides
Aarhus University
2015-2024
Planetary Science Institute
2006-2024
University of California, Davis
2012-2023
University of California System
1995-2015
Texas A&M University
2008
Georgia Institute of Technology
2007
Danish Gas Technology Centre (Denmark)
1998
Lamont-Doherty Earth Observatory
1986-1992
Columbia University
1986-1992
We examine the effects of melt depletion on density and anharmonic V P S basis melting relations fertile peridotite between 1 7 GPa. incorporate variable mineral mode composition into a parameterization mantle residuum velocity, using new compilation physics results. The effect changes with pressure, at 20% removal, residue are −0.42%, −0.46%, −0.90%, −1.14%, −0.95%, −0.66%, −0.57%, for pressures 1, 3, 3.5, 4, 6, GPa, respectively. note that adiabatic temperatures, realistic upper has higher...
Igneous differentiation processes are constrained from bulk compositions, densities and mineral modes of 116 cumulate gabbro samples in a new reference profile through the Layered Series Skaergaard intrusion, East Greenland. The stratigraphic distribution P, U Rb cumulates residual magma, modeled by Rayleigh fractionation, constrains final porosities or trapped liquid contents to 30–52% LZa troctolites, decreasing 4–12% at top LZb olivine-gabbros remaining low (1–13%; 4·6% on average)...
Genetically deformed plant spores indicate that mercury toxicity played a part in the mass extinction 201 million years ago.
Diffusion coefficients that govern chemical and isotopic exchange of Sr Nd were determined from compositional profiles developed between juxtaposed anhydrous basaltic rhyolitic liquids. Analysis simple diffusion couples involving isotopically enriched normal tholeiitic basalt metaluminous rhyolite recover self‐diffusion ( D *) in the end‐member compositions contrasting polymerization. Self‐diffusion is 7 times faster melt than at 1255°C 1 GPa, while more order magnitude greater rhyolite....
A potential driving force for cumulate compaction and melt segregation in magmas arises from the change crystal solubility with temperature. Spatial thermal variation a cumulus pile sets up gradient interstitial composition, which turn provides diffusion silicate liquid species. Mass transport response to this potential, referred as migration, drives adcumulus mineral growth cooler regions of toward warmer regions. Heat loss through mush zone country rock promotes expulsion intercumulus back...
High‐pressure sintering of nanocrystalline γ‐A1 2 O 3 has been studied over a temperature range 923‐1323 K and at pressure 1 GPa. The γ‐Al to α‐Al transformation changed from 1473 without ∼1023 Full density was obtained 1273 1323 in 10 min. microhardness value fully dense α‐alumina with grain size 142 nm found be 25.3 ± 0.8 Hall‐Petch slope for the very fine is different that coarse‐grained alumina.
The energetics of Y2O3 cubic (C-type) and monoclinic (B-type) polymorphs as a function surface area have been studied by high-temperature oxide melt solution calorimetry water adsorption calorimetry. hydrated the phase has lower enthalpy (0.64 ± 0.49 J/m2) than that (1.25 0.17 J/m2). However, anhydrous form is less stable (surface = 2.78 (1.66 0.14 transformation (monoclinic to cubic) for coarse −21.8 3.2 kJ/mol. An energetic crossover suggested between under ambient conditions, in which...
Thermal (Soret) diffusion of major, minor, and trace components naturally occurring silicate melts ranging in composition from tholeiitic basalt to high‐silica rhyolite is examined at 1 GPa, mean temperatures 1380°–1535°C, temperature gradients 50°–80°C mm −1 . Soret channeled along network former/network modifier compositional vectors indistinguishable those observed liquid immiscibilty studies, but the former case, are continuous between (and thermal) extremes. Si, chief former, invariably...
Isotopes fractionate in thermal gradients, but there is little quantitative understanding of this effect complex fluids. Here we present results experiments and molecular dynamics simulations on silicate melts. We show that isotope fractionation arises from classical mechanical effects, a scaling relation based Chapman-Enskog theory predicts the behavior seen fluids without arbitrary fitting parameters. The analysis reveals network forming elements (Si O) significantly less than modifiers...
Knowledge of the inorganic components biomass feedstock is important for process control and handling coproducts wastes resulting from energy fuel utilization biomass. Analytical survey forestry thinnings (wood chips), agricultural residues (rice straw, wheat corn stover), dedicated perennial grass crops (switchgrass, wheatgrass, miscanthus) shows that, potentially, whole periodic table may be present in The main effect ashing bonding oxygen ash mainly as silicate, oxides, hydroxides,...
Abstract The compositions and volumes of basalts erupted in divergent margin environments provide a record the thermal, chemical, dynamical state their mantle source regions. To relate basalt to underlying thermochemical regions, we have developed REEBOX PRO, compiled stand‐alone application that simulates adiabatic decompression melting passively or actively upwelling containing up five distinct lithologies. model calculates melt using thermodynamic experimental constraints on behaviors...
Abstract Archaeological glass contains information about the movement of goods and ancient economies, yet our understanding critical aspects industry is fragmentary. During Roman times, distinct types produced in coastal regions Egypt Levant used evaporitic soda (natron) mixed with Nile-derived sands. In Levant, furnaces for producing colourless by addition manganese have been uncovered, whereas source desirable antimony-decolourised remains an enigma. Edict Diocletian, this listed as “...