Low Temperature Phase Relations in the System H2O-NaCl-FeCl2

dc.contributor.authorBaldassaro, Paige Marieen
dc.contributor.committeechairBodnar, Robert J.en
dc.contributor.committeememberRimstidt, J. Donalden
dc.contributor.committeememberTracy, Robert J.en
dc.contributor.departmentGeological Sciencesen
dc.date.accessioned2014-03-14T20:31:33Zen
dc.date.adate2000-02-09en
dc.date.available2014-03-14T20:31:33Zen
dc.date.issued1998-05-08en
dc.date.rdate2001-02-09en
dc.date.sdate2000-02-07en
dc.description.abstractThe 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.degreeMaster of Scienceen
dc.identifier.otheretd-02072000-12380020en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-02072000-12380020/en
dc.identifier.urihttp://hdl.handle.net/10919/31155en
dc.publisherVirginia Techen
dc.relation.haspartETD.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectsodium chlorideen
dc.subjectlow temperature aqueous geochemistryen
dc.subjectsynthetic fluid inclusionsen
dc.subjectiron chlorideen
dc.titleLow Temperature Phase Relations in the System H2O-NaCl-FeCl2en
dc.typeThesisen
thesis.degree.disciplineGeological Sciencesen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen
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