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EXPERIMENTAL DETERMINATION OF FE ISOTOPE FRACTIONATION BETWEEN AQUEOUS FE(II), SIDERITE AND "GREEN RUST" IN ABIOTIC SYSTEMS

Wiesli R.A.; Beard B.L.; Johnson C.M. (2004)

Iron isotope fractionation between aqueous iron and siderite has been measured using abiotic synthesis experiments at ∼20 °C. Applying a Rayleigh distillation model to three experiments in which siderite (FeCO3) was ...
EXPERIMENTAL DETERMINATION OF METAL/SILICATE PARTITION COEFFICIENTS FOR P, CO, NI, CU, GA, GE, MO, AND W AND SOME IMPLICATIONS FOR THE EARLY EVOLUTION OF THE EARTH

Schmitt W.; Palme H.; Wänke H. (1989)

Metal/silicate partition coefficients were determined at 1600°C for P, Ga, Ge and W and at 1300°C for P, Fe, Co, Ni, Cu, Ga, Ge, Mo and W. Experiments span a range of two orders-of-magnitude in oxygen fugacity. Good ...
EXPERIMENTAL DETERMINATION OF NI DIFFUSION COEFFICIENTS IN OLIVINE AND THEIR DEPENDENCE ON TEMPERATURE, COMPOSITION, OXYGEN FUGACITY, AND CRYSTALLOGRAPHIC ORIENTATION

Petry C.; Chakraborty S.; Palme H. (2004)

Diffusion couple experiments were carried out with San Carlos olivine (Fo90) and NiFe alloys (Ni100, Ni97Fe3, Ni90Fe10) or other olivine compositions (Fo100, Fo25) in order to determine the dependence on temperature, oxygen ...
EXPERIMENTAL DETERMINATION OF OXYGEN ISOTOPE FRACTIONATIONS BETWEEN CO2 VAPOR AND SODA-MELILITE MELT

Appora I.; Eiler J.M.; Matthews A.; Stolper E.M. (2003)

We report results of experiments constraining oxygen isotope fractionations between CO2 vapor and Na-rich melilitic melt at 1 bar and 1250 and 1400°C. The fractionation factor constrained by bracketed experiments, ...
EXPERIMENTAL DETERMINATION OF PARTIAL MOLAR VOLUMES OF GA2O3 AND GEO2 IN SILICATE MELTS: IMPLICATIONS FOR THE PRESSURE DEPENDENCE OF METAL-SILICATE PARTITION COEFFICIENTS

Holzapfel C.; Courtial P.; Dingwell D.B.; Chakraborty S.; Palme H. (2001)

In this study, densities of gallium and germanium bearing silicate liquids were determined using the double bob Archimedian method. The silicate base components of the liquids were sodium disilicate (NS2) and anorthite-diopside ...
EXPERIMENTAL DETERMINATION OF REE DISTRIBUTIONS BETWEEN MONAZITE AND XENOTIME: POTENTIAL FOR TEMPERATURE-CALIBRATED GEOCHRONOLOGY

Andrehs G.; Heinrich W. (1998)

Solid solutions of the REE+Y orthophosphates monazite and xenotime were synthesized hydrothermally between 300°C and 800°C at 2 and 5 kbar using REE+Y-oxides and H3PO4 as starting materials. The REE bulk composition was ...
EXPERIMENTAL DETERMINATION OF REE FRACTIONATION BETWEEN LIQUID AND VAPOUR IN THE SYSTEMS NACL-H2O AND CACL2-H2O UP TO 450 °C

Shmulovich K.; Heinrich W.; Moller P.; Dulski P. (2002)

Fractionation of selected REE between brine and vapour was experimentally determined using a large-volume rocking Ti-autoclave that allowed quasi-isobaric sampling of liquid-vapour pairs. Samples were extracted along the ...
EXPERIMENTAL DETERMINATION OF STABILITY CONSTANTS OF AQUEOUS COMPLEXES

Ohman L.O. (1998)

Based on the use of thermodynamic data, chemical modelling offers a unique technique to predict and understand the chemistry of metal ions in aquatic systems. This paper discusses the necessary precautions that must be ...
EXPERIMENTAL DETERMINATION OF SYNTHETIC NDPO4 MONAZITE END-MEMBER SOLUBILITY IN WATER FROM 21°C TO 300°C: IMPLICATIONS FOR RARE EARTH ELEMENT MOBILITY IN CRUSTAL FLUIDS

Poitrasson F.; Oelkers E.; Schott J.; Montel J.M. (2004)

The solubility of synthetic NdPO4 monazite end-member has been determined experimentally from 21 to 300°C in aqueous solutions at pH = 2, and at 21°C and pH = 2 for GdPO4. Measurements were performed in batch reactors, ...
EXPERIMENTAL DETERMINATION OF THE ACTIVITY OF CHROMITE IN MULTICOMPONENT SPINELS

Kessel R.; Beckett J.R.; Stolper E.M. (2003)

We determined activity-composition relationships in Pt-Cr and Pt-Fe-Cr alloys at 1300°C experimentally and used the results to constrain the thermodynamic properties of chromite-picrochromite spinels. The Pt-Cr binary is ...
EXPERIMENTAL DETERMINATION OF THE ACTIVITY-COMPOSITION RELATIONS AND PHASE EQUILIBRIA OF H2O-CO2-NACL FLUIDS AT 500°C, 500 BARS

Anovitz L.M.; Labotka T.C.; Blencoe J.G.; Horita J. (2004)

An understanding of the activity-composition (a-X) relations and phase equilibria of halite-bearing, mixed-species supercritical fluids is critically important in many geological and industrial applications. We have performed ...
EXPERIMENTAL DETERMINATION OF THE COMPLEXATION OF STRONTIUM AND CESIUM WITH ACETATE IN HIGH-TEMPERATURE AQUEOUS SOLUTIONS

Ragnarsdottir K.Vala; Fournier P.; Oelkers E.H.; Harrichoury J.-C. (2001)

Radionuclides are present in contaminated surfacial waters, but their behavior in the presence of natural organic acids is poorly known. Dissociation constants for the strontium acetate (SrCH3COO+) and cesium acetate ...
EXPERIMENTAL DETERMINATION OF THE DIFFUSION COEFFICIENT FOR CALCIUM IN OLIVINE BETWEEN 900°C AND 1500°C

Coogan L.A.; Hain A.; Stahl S.; Chakraborty S. (2005)

Experiments have been carried out to determine the temperature, oxygen fugacity (fO2) and compositional dependence of the tracer diffusion coefficient (D) of calcium in olivine. These data constrain the diffusion coefficient ...
EXPERIMENTAL DETERMINATION OF THE EQUILIBRIA: RUTILE + MAGNESITE = GEIKIELITE + CO2 AND ZIRCON + 2 MAGNESITE = BADDELEYITE + FORSTERITE + 2 CO2

Ferry J.M.; Newton R.C.; Manning C.E. (2002)

The P-T conditions of both equilibria were determined precisely by reversal experiments in a piston-cylinder apparatus. On the basis of 8 experiments. brackets for the rutile-magnesite-geikielite equilibrium are 7.0-7.1 ...
EXPERIMENTAL DETERMINATION OF THE PARTITIONING BEHAVIOR OF RARE EARTH AND HIGH FIELD STRENGTH ELEMENTS BETWEEN PARGASITIC AMPHIBOLE AND NATURAL SILICATE MELTS

Hilyard M.; Nielsen R.L.; Beard J.S.; Patinõ-Douce A.; Blencoe J. (2000)

The primary goal of this investigation was to derive a set of expressions that can be used to calculate the amphibole-melt partitioning behavior of the rare earth elements (REE) and the high field strength elements (HFSE) ...
EXPERIMENTAL DETERMINATION OF THE REACTION ARAGONITE + MAGNESITE = DOLOMITE AT 5 TO 9 GPA

Luth R.W. (2001)

Martinez et al. bracketed the decomposition reaction of dolomite to aragonite + magnesite between 5.0 and 5.5 GPa at 600 C using in-situ XRD in a multi-anvil apparatus. They then extrapolated their results using the available ...
EXPERIMENTAL DETERMINATION OF THE REACTION DOLOMITE + 2 COESITE = DIOPSIDE + 2 CO2 TO 6 GPA

Luth R.W. (1996)

The carbonation reaction CaMg(CO3)2 (dolomite)+2SiO2 (coesite)=CaMgSi2O6 (diopside)+2 CO2 (vapor) has been determined experimentally between 3.5 and 6 GPa in a multiple-anvil, solid-media apparatus. This reaction, a candidate ...
EXPERIMENTAL DETERMINATION OF THE REACTION: MAGNESITE + ENSTATITE = FORSTERITE + CO2 IN THE RANGES 6-25 KBAR AND 700-1100 °C

Koziol A.M.; Newton R.C. (1998)

The P-T equilibrium curve of the reaction of magnesite + enstatite = forsterite and CO2 was determined in the ranges 6-25 kbar and 700-1100 degrees C by 53 reversed experiments carried out in 1.91 cm diameter piston-cylinder ...
EXPERIMENTAL DETERMINATION OF THE SOLUBILITY OF AU IN SILICATE MELTS

Borisov A.; Palme H. (1996)

We report here new data on the solubility of Au in silicate melts of anorthite-diopside eutectic composition at a wide range of oxygen fugacities, from pure oxygen to 10−8 atm, and at a temperature range of 1300 °C to 1480 ...
EXPERIMENTAL DETERMINATION OF THE SOLUBILITY OF NATURAL WOLLASTONITE IN PURE WATER UP TO PRESSURES OF 5 GPA AND AT TEMPERATURES OF 400-800°C

Fockenberg T.; Burchard M.; Maresch W.V. (2006)

The solubility of natural, near-end-member wollastonite-I (<99.5% CaSiO3) has been determined at temperatures from 400 to 800 °C and pressures between 0.8 and 5 GPa in piston-cylinder apparatus with the weight-loss method. ...

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