Low Temperature Phase Relations in the System H2O-NaCl-FeCl2
dc.contributor.author | Baldassaro, Paige Marie | en |
dc.contributor.committeechair | Bodnar, Robert J. | en |
dc.contributor.committeemember | Rimstidt, J. Donald | en |
dc.contributor.committeemember | Tracy, Robert J. | en |
dc.contributor.department | Geological Sciences | en |
dc.date.accessioned | 2014-03-14T20:31:33Z | en |
dc.date.adate | 2000-02-09 | en |
dc.date.available | 2014-03-14T20:31:33Z | en |
dc.date.issued | 1998-05-08 | en |
dc.date.rdate | 2001-02-09 | en |
dc.date.sdate | 2000-02-07 | en |
dc.description.abstract | The low temperature phase behavior of the system H2O-NaCl-FeCl2 was examined using synthetic fluid inclusions. Experiments were conducted along the 5 wt% NaCl (relative to the total solution) pseudobinary, with FeCl2 concentrations varying from 2 to 33 wt%, and along the pseudobinary defined by mixing known amounts of FeCl2-4H2O with a 5 wt% NaCl solution, with final FeCl2 concentrations varying from 0 to 29 wt%. Synthetic fluid inclusions in quartz were prepared in cold-seal pressure vessels at 500 degrees C - 800 degrees C and 2 or 3 kilobars. The fO2 conditions were controlled by the Ni-NiO equilibrium curve. The liquid released from the capsule upon opening was initially colorless, but turned yellow-orange after contact with atmospheric O2. The clear color is characteristic of ferrous iron solutions, whereas the yellow-orange color is consistent with the presence of Fe3+ in solution. This color change suggested that the unopened capsules initially contained ferrous iron in solution, which oxidized to ferric iron when exposed to the atmosphere. Borisenko (1977) reported a eutectic temperature of -37 degrees C for the system H2O-NaCl-FeCl2. In this study, it was not possible to verify this temperature due to the persistence of a metastable liquid down to liquid N2 temperatures (~-196 degrees C). Final ice melting temperatures were obtained for concentrations less than 24 wt% FeCl2 and show a decrease in temperature with increase in FeCl2 concentration. For more concentrated solutions, final melting temperatures could not be obtained because the samples could not be frozen. | en |
dc.description.degree | Master of Science | en |
dc.identifier.other | etd-02072000-12380020 | en |
dc.identifier.sourceurl | http://scholar.lib.vt.edu/theses/available/etd-02072000-12380020/ | en |
dc.identifier.uri | http://hdl.handle.net/10919/31155 | en |
dc.publisher | Virginia Tech | en |
dc.relation.haspart | ETD.pdf | en |
dc.rights | In Copyright | en |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | en |
dc.subject | sodium chloride | en |
dc.subject | low temperature aqueous geochemistry | en |
dc.subject | synthetic fluid inclusions | en |
dc.subject | iron chloride | en |
dc.title | Low Temperature Phase Relations in the System H2O-NaCl-FeCl2 | en |
dc.type | Thesis | en |
thesis.degree.discipline | Geological Sciences | en |
thesis.degree.grantor | Virginia Polytechnic Institute and State University | en |
thesis.degree.level | masters | en |
thesis.degree.name | Master of Science | en |
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