Results 171 to 180 of about 15,904 (206)
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Experimental control of oxygen fugacities by graphite-gas equilibriums
Journal of Geophysical Research, 1965Control of oxygen fugacities in a CO + CO atmosphere has been established experimentally by using a solid-phase buffer technique. Equilibration between the buffer and the enclosed sample is established by diffusion of the gas atmosphere through the buffer. The establishment of equilibrium by this method is indicated by the reversibility of experimental
Bevan M. French, Hans P. Eugster
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Oxygen fugacity dependence of Os solubility in haplobasaltic melt
Geochimica et Cosmochimica Acta, 2006Os equilibrium solubilities were determined at 1350 °C over a wide range of oxygen fugacities (−12
S.S. Fortenfant +5 more
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Kaersutitic and Ti-pargasitic amphiboles and oxygen fugacity
2008Since long time kaersutite and Ti-pargasite were studied because they are retained to be useful for the estimation of fO2 and fH2 conditions of their hosting rocks (especially for mantle derived rocks and nodules). These amphiboles have currently low hydrogen (even close to 0) content than the classical 2 a.p.f.u..
Iezzi G +3 more
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Oxygen Fugacity Control in Nonflowing Atmospheres: II, Theoretical Model
Journal of the American Ceramic Society, 1992Experimentally observed deviations from ideal isothermal behavior of solid electrolyte sensors are explained on the basis of gas‐phase diffusion in the furnace atmosphere. The presence of small amounts of CO/CO 2 or other oxygenbearing gas species is essential to the theoretical explanation ...
Gerald P. Wirtz, Fernando M. B. Marques
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The oxygen fugacity within carbonated eclogites
2011The subduction of carbon back into the mantle is an important natural form of carbon sequestration. Eclogitic nodules and CO2-rich metasomatic agents show evidence for the passage of carbon and carbonate (solid or melts) in the mantle. Further, diamonds from kimberlites occur in eclogite xenoliths more frequently than in peridotite xenoliths but the ...
STAGNO, VINCENZO, Frost, DJ, McCammon CA
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Records of Archean mantle oxygen fugacity
Goldschmidt2023 abstracts, 2023Elizabeth Cottrell +5 more
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Iron-titanium oxides and oxygen fugacities in volcanic rocks
Journal of Geophysical Research, 1967It is shown that in silicate liquids the ferric-ferrous equilibrium is controlled by temperature, oxygen fugacity, and the composition of the liquid, particularly its alkali content. Thus, if the iron-titanium oxide minerals that precipitate from a silicate liquid reflect the ferric-ferrous equilibrium, the oxygen geobarometer of Buddington and ...
I. S. E. Carmichael, J. Nicholls
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1971
Recent advances in the theory and technology of solid electrolyte sensors have opened up a very promising field of direct monitoring of thermodynamic behavior of a chemical system which involves a non-condensed phase directly or indirectly. At present only oxygen and sulfur sensors are practical to use, but it is very likely that sensors for other ...
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Recent advances in the theory and technology of solid electrolyte sensors have opened up a very promising field of direct monitoring of thermodynamic behavior of a chemical system which involves a non-condensed phase directly or indirectly. At present only oxygen and sulfur sensors are practical to use, but it is very likely that sensors for other ...
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Deep, hot, ancient melting recorded by ultralow oxygen fugacity in peridotites
NatureThe oxygen fugacity (fO2) of convecting upper mantle recorded by ridge peridotites varies by more than four orders of magnitude1-3. Although much attention has been given to mechanisms that drive variations in mantle fO2 between tectonic settings1,3,4 and to comparisons of fO2 between modern rocks and ancient-mantle-derived rocks5-10, comparatively ...
Suzanne K. Birner +3 more
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OXYGEN FUGACITY OF PERIDOTITES FROM THE VEMA FRACTURE ZONE
Geological Society of America Abstracts with Programs, 2022Joshua Ames, Suzanne Birner
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