Calculation of temperature - oxygen fugacity tables for H₂-CO₂ gas mixtures at one atmosphere total pressure, and an investigation of the zoisite-clinozoisite transition

dc.contributor.authorPrunier, Arthur R.en
dc.contributor.departmentGeological Sciencesen
dc.date.accessioned2017-01-10T20:35:13Zen
dc.date.available2017-01-10T20:35:13Zen
dc.date.issued1978en
dc.description.abstractPart I: Calculation of Temperature - Oxygen Fugacity Tables for H₂ - CO₂ Gas Mixtures at One Atmosphere Total Pressure. The initial CO₂ volumes yielding selected oxygen fugacities at specified temperatures have been computed for H₂ - CO₂ gas mixtures at one atmosphere total pressure. The calculations are based on the thermochemical data of the JANAF (1971) Tables for the species CO₂-H₂-H₂O-CO-O₂-CH₄ and are carried out using the Newton-Raphson method of successive approximation. The new tables replace older ones (Dienes, Nafziger, Ulmer and Woermann, 1974) in which the effects of CH₄ on the system were treated only in an approximate manner. Part II: An Investigation of the Zoisite - Clinozoisite Transition Available data on natural coexisting zoisite - clinozoisite (Ca₂Al<sub>3-x</sub>Fe<sub>x</sub>[Si₂O₇][SiO₄]O(OH) with x ≤ 0.33) assemblages imply that the two phases are related by a solid solution transition loop, with zoisite being the low-iron, high-temperature, high-pressure phase. Reversibility experiments at 6500 bars constrain the iron-free equilibrium clinozoisite zoisite to lie below 407°C. Electron microprobe and single crystal x-ray diffraction studies of epitactically related zoisite-clinozoisite crystals grown from seeded mixtures of anorthite, calcite, hematite and silica glass at 6500 bars and 650°C are shown to bracket the transition loop between Pistacite 3.2 (Ca₂Al<sub>2.90</sub>Fe<sub>0.10</sub>Si₃O₁₂(OH)) and Pistacite 12.6 (Ca₂Al<sub>2.62</sub>Fe<sub>0.38</sub>Si₃O₁₂(OH)). Experimental techniques used in this investigation, which focus on detalied analysis of single crystals, offer promise as a means for determining equilibrium phase relations of epidotes and other frequently zoned mineral groups.en
dc.description.degreeMaster of Scienceen
dc.format.extentvi, 124 leavesen
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/10919/74143en
dc.language.isoenen
dc.publisherVirginia Polytechnic Institute and State Universityen
dc.relation.isformatofOCLC# 40004538en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1978.P78en
dc.titleCalculation of temperature - oxygen fugacity tables for H₂-CO₂ gas mixtures at one atmosphere total pressure, and an investigation of the zoisite-clinozoisite transitionen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineGeological Sciencesen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen
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