Browsing ELibrary by Subject "HIGH PRESSURE"
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Browsing ELibrary by Subject "HIGH PRESSURE"
Now showing items 21-40 of 51
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(2000)A hydrothermal diamond anvil cell (HDAC) has been modified by drilling holes with a laser to within 150 μm of the anvil face to minimize the loss of X-rays due to absorption and scatter by diamond. This modification enables ...
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(2001)We present the first investigation of in situ high-pressure and high-temperature bubble growth in silicic melts. In a hydrothermal diamond-anvil cell, a haplogranite melt (79 wt% SiO2) is hydrated then subjected to cooling ...
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(2001)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 in a multi-anvil apparatus at high ...
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(2000)Lizardite was pressurized up to about 28 and 20 GPa and heated at 1310 (+/-50) and 1100 (+/-100)°C; antigorite was pressurized at about 25 and 22 GPa and heated at ~1000°C, with a Nd:YAG laser using the double-side laser ...
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(2005)We present the phase relations in anhydrous CaO-MgO-FeO-Al2 O3-SiO2-pyrolite to examine the influence of compositional difference between pyrolite and Mg2 SiO4 on the post-spinel phase transformation. It is shown that in ...
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(1997)The survival of coesite in ultrahigh-pressure (UHP) rocks has important implications for the exhumation of subducted crustal rocks. We have conducted experiments to study the mechanism and rate of the coesite->quartz ...
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(2001)Experimental multi-anvil study of the phase relations in subducted oceanic crust (mid-ocean ridge basalt (MORB)) composition over a pressure range from 25 to 37 GPa, equivalent to depths of 700-950 km in the lower mantle, ...
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(2002)Melting experiments at 2100-2400°C and 22-24.5 GPa to determine the liquidus to solidus phase relations and element partitioning coefficients were performed on different peridotite compositions: a pyrolite model and a KLB-1 ...
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(2001)Knowledge of the mineralogical constituents of the Earth's mantle depends heavily on high-P experiments of pyrolite composition. In order to understand the planetary interior better, phase relations and mineral physics ...
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(1997)Phase relations of natural phlogopite and phlogopite + enstatite compositions were determined experimentally at pressures of 4-8 GPa and temperatures of 1200-1500°C using a uniaxial split-sphere apparatus. Phlogopite in ...
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(2003)We have studied the plastic deformation of Mg2SiO4 wadsleyite polycrystals. Wadsleyite was synthesized from a forsterite powder in a multianvil apparatus. It was then recovered and placed in a second multianvil assembly ...
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(2003)We have studied the dislocation microstructures that develop in (Mg0.9Fe0.1)2SiO4 wadsleyite deformed by simple shear at high pressure. The experiments were performed in a multianvil apparatus with the shear assembly ...
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(2001)Raman spectra of hydrous beta-Mg2SiO4 (1.65wt% H2O) have been measured in a diamond-anvil cell with helium as a pressure-transmitting medium at room temperature to 50GPa. We observe three OH-stretching modes, a doublet ...
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(2002)In-situ Raman measurements of silica speciation in aqueous fluids in equilibrium with solid quartz are reported to 14 kbar and 900 °C. Silica speciation in the fluid depends strongly on temperature and pressure. The Raman ...
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(2001)Silicon solubility in liquid Fe-rich metal was measured experimentally as a function of pressure, temperature and oxygen fugacity to determine if silicon could be a major light element in the Earth's core. At the P, T, fO2 ...
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(2002)Raman spectra of diopside were collected from atmospheric pressure to 71 GPa. The pressure dependences of 22 modes were determined. Changes occurred in the spectra at three different pressures. First, at approximately 10 ...
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(2003)We carried out a series of melting experiments with hydrous primitive mantle compositions to determine the stability of dense hydrous phases under high pressures. Phase relations in the CaO-MgO-Al2O3-SiO2 pyrolite with ˜2 ...
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(2003)The high-pressure behavior of α-Fe2O3 has been studied under static compression up to 60 GPa, using a laser-heated diamond anvil cell. Synchrotron-based angular-dispersive X-ray diffraction shows that the sample remains ...
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(2001)High-pressure Raman investigations were carried out on a synthetic fluorapatite up to about 7 GPa to analyse the behaviour of the phosphate group's internal modes and of its lattice modes. The Raman frequencies of all modes ...
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(2002)In order to clarify Al2O3 content and phase stability of aluminous CaSiO3-perovskite, high-pressure and high-temperature transformations of Ca3Al2Si3O12 garnet (grossular) were studied using a MA8-type high-pressure apparatus ...
Now showing items 21-40 of 51