Gold solubility studies in hydrous subaluminous rhyolitic/granitic melts of three compositions (a subaluminous rhyolite (LCO), a subaluminous rhyolite with 1.2 wt.% fluorine (MRF), and a subaluminous rhyolite with ~0.35 wt.% chlorine (LCI)) were conducted in a piston cylinder apparatus at temperature and pressure ranges of 900--1250°C and 6--9 kbar (0.6--0.9 GPa). Starting rock powders were sealed in Au75Pd25 capsules (that acted as the source of Au) with 5--7 wt.% water. Oxygen fugacities were near 2 log units above the nickel-nickel-oxide (NNO) buffer. Gold contents in experimental glass products were analyzed by laser ablation - inductively coupled plasma - mass spectrometers (LA-ICP-MS). / Combining solubility data in "near" Cl saturated melts at an oxygen fugacity of 2 log units above the NNO buffer from this study and Au solubility data in H2O saturated with NaCl from Ballhaus et al. (1994), the fluid/melt partition coefficient for Au was calculated. A fluid/melt partition coefficient was calculated with Au solubility data that was extrapolated to 2 log units below the fayalite-magnetite-quartz (FMQ) buffer, using the relationship between log Au concentration and log fO2 from Borisov and Palme (1996). Sulfide/melt partition coefficients for Au were calculated by combining Au solubility data from this study with Au solubility data from Cygan and Candela (1995). (Abstract shortened by UMI.)
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.21568 |
| Date | January 1999 |
| Creators | Hoosain, Leyla. |
| Contributors | Baker, Don R. (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science (Department of Earth and Planetary Sciences.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001658673, proquestno: MQ50790, Theses scanned by UMI/ProQuest. |
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