Results 151 to 160 of about 1,123,502 (206)
The color of meteoritic hibonite: an indicator of oxygen fugacity
Earth and Planetary Science Letters, 1986 Hibonites similar in composition to those found in Ca-Al-rich inclusions change color from blue, to green, to orange, to nearly colorless as oxygen fugacity is increased at high temperature from below the iron-wustite buffer up to air. The development of the blue color is correlated with the growth of an absorption band at 715 nm in the optical spectra
Ihinger, Phillip D., Stolper, Edward
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Oxygen fugacity control in piston-cylinder experiments
Contributions To Mineralogy and Petrology, 2012The main goal of this study was to develop and test a capsule assembly for use in piston-cylinder experiments where oxygen fugacity could be controlled in the vicinity of the QFM buffer without H2O loss or carbon contamination of the sample material. The assembly consists of an outer Pt-capsule containing a solid buffer (Ni–NiO or Co–CoO) plus H2O and ...
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The effect of oxygen fugacity on the solubility of carbon-oxygen fluids in basaltic melt
Earth and Planetary Science Letters, 1992 The solubility of CO2CO fluids in a mid-ocean ridge basalt (morb) has been measured at 1200°C, 500-1500 bar, and oxygen fugacities between NNO and NNO-4. High oxygen fugacities, and thus CO2-rich fluids, were produced by using a starting material equilibrated at NNO, and Ag2C2O4 as the fluid source. Low oxygen fugacities were achieved by using graphite
Pawley, Alison R.; id_orcid 0000-0002-3022-3235 +2 more
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The oxygen fugacity within carbonated eclogites
, 2011 The 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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Effect of oxygen fugacity and water on phase equilibria of a hydrous tholeiitic basalt
Contributions To Mineralogy and Petrology, 2010 The influence of oxygen fugacity and water on phase equilibria and the link between redox conditions and water activity were investigated experimentally using a primitive tholeiitic basalt composition relevant to the ocean crust.
Juergen Koepke +2 more
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OXYGEN FUGACITY ACROSS TECTONIC SETTINGS
Goldschmidt2022 abstracts, 2020Experiment and observation have established the centrality of oxygen fugacity (fO2) to determining the course of igneous differentiation, and so the development and application of oxybarometers have proliferated for more than half a century. The compositions of mineral, melt, and vapor phases determine the fO2 that rocks record, and the activity models
Elizabeth Cottrell +5 more
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Oxygen Fugacities Directly Measured in Magmatic Gases
Science, 1966An electrochemical device was used to measure the fugacity of oxygen ( f O 2 ) in holes drilled through the crust of Makaopuhi lava lake, Kilauea Volcano, Hawaii. Results obtained within 6 months of the lake formation show that log f
M, Sato, T L, Wright
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Plate subduction, oxygen fugacity, and mineralization
Journal of Oceanology and Limnology, 2019Plate subduction is the largest natural factory that processes elements, which controls recycling and mineralization of a variety of elements. There are three major ore deposit belts in the world: the circum-Pacific, the central Asian, and the Tethys belts. All the three belts are closely associated with plate subductions, the mechanism remains obscure.
He Liu +4 more
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