A novel approach to determine high-pressure high-temperature fluid and melt compositions using diamond-trap experiments
-
Ronit Kessel
,
Peter Ulmer
Abstract
We have developed a novel analytical technique for diamond-trap experiments to directly analyze high-pressure, high-temperature fluid and melt compositions in equilibrium with mantle material. Experiments were conducted at a pressure of 6 GPa and temperatures between 900-1200 °C in a multi-anvil apparatus with a synthetic K-free eclogite doped with 860 ppm Cs, ~20 wt% H2O, and a layer of diamond aggregates serving as a fluid/melt trap. Experiments at identical conditions were analyzed with two different methods. In the new, “freezing,” approach, the capsule was frozen prior to opening and kept frozen during laser-ablation ICP-MS analysis, thus ablating the quenched fluid (precipitates together with water that unmixed upon quenching) in a solid state. Cesium, fractionating completely into the fluid or melt phase, was used as an internal standard for calculating the fluid compositions. Calculated uncertainties on H2O content in the fluid composition are 0.7-2.5%. In the conventional “evaporation” approach, water from the unmixed fluid was first evaporated from the capsule, then the remaining fluid precipitates were analyzed by LA-ICP-MS. The compositions of the residual eclogitic minerals were measured by electron microprobe, and the fluid composition was then determined by mass-balance. Uncertainties in mineral compositions lead to poor precision in fluid composition in this latter approach. Results of the two methods of fluid analysis were found to be in good agreement. Because the “freezing” approach analyzes the entire fluid directly and does not rely on mass balance for calculating fluid compositions, our new method provides a superior means for determining the composition of fluids. Secondly, it avoids loss of cations that remain soluble in water (e.g., Cs, K) after quenching the experiment.
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- Hydroxyl in omphacites and omphacitic clinopyroxenes of upper mantle to lower crustal origin beneath the Siberian platform
- Structural variations induced by difference of the inert pair effect in the stibnite-bismuthinite solid solution series (Sb,Bi)2S3
- Hydrogen solubility and speciation in natural, gem-quality chromian diopside
- Ultrastructure, aggregation-state, and crystal growth of biogenic nanocrystalline sphalerite and wurtzite
- Impactite from Henbury, Australia
- Neutron and synchrotron X-ray diffraction study of the structures and dehydration behaviors of ramsdellite and “groutellite”
- Hydrothermal synthesis and crystal chemistry of the new strontium uranyl selenites, Sr[(UO2)3(SeO3)2O2]⋅4H2O and Sr[UO2(SeO3)2]
- Study of cation order-disorder in MgAl2O4spinel by in situ neutron diffraction up to 1600 K and 3.2 GPa
- Magnetic granulometry from equilibrium magnetization measurements: Mineral magnetometry of superparamagnetic particles and application to synthetic ferrihydrites
- Hydroxide in kyanite: A quantitative determination of the absolute amount and calibration of the IR spectrum
- Analysis of uranyl-bearing phases by EXAFS spectroscopy: Interferences, multiple scattering, accuracy of structural parameters, and spectral differences
- X-ray diffraction evidence for a monoclinic form of stibnite, Sb2S3, below 290 K
- Sulfur species at chalcopyrite (CuFeS2) fracture surfaces
- Dehydration and rehydration process in boggsite: An in situ X-ray single-crystal study
- Empressite, AgTe, from the Empress-Josephine mine, Colorado, U.S.A.: Composition, physical properties, and determination of the crystal structure
- Correlation of pH-dependent surface interaction forces to amino acid adsorption: Implications for the origin of life
- A near-infrared spectroscopic study of hydroxyl in natural chondrodite
- High-pressure elasticity of a natural magnetite crystal
- Isotopic and chemical alteration of zircon by metamorphic fluids: U-Pb age depth-profiling of zircon crystals from Barrowʼs garnet zone, northeast Scotland
- A novel approach to determine high-pressure high-temperature fluid and melt compositions using diamond-trap experiments
- Lindbergite, a new Mn oxalate dihydrate from Boca Rica mine, Galiléia, Minas Gerais, Brazil, and other occurrences
- Pyrophyllite dehydroxylation process by First Principles calculations
- Plagioclase from planetary basalts: Chemical signatures that reflect planetary volatile budgets, oxygen fugacity, and styles of igneous differentiation
- The structure of the manganese oxide on the sheath of the bacterium Leptothrix discophora: An XAFS study
- An X-ray Rietveld study of piemontite on the join Ca2Al3Si3O12(OH)–Ca2Mn33+Si3O12(OH) formed by hydrothermal synthesis
- Raman spectroscopy of basic copper(II) and some complex copper(II) sulfate minerals: Implications for hydrogen bonding
- Incorporation of sodium into the chlorite structure: the crystal structure of glagolevite, Na(Mg,Al)6[Si3AlO10](OH,O)8
- Cation disorder in dolomite, CaMg(CO3)2, and its influence on the aragonite + magnesite ↔ dolomite reaction boundary
