Fluid-saturated experiments were conducted to investigate the elemental partitioning of boron among melt, aqueous vapor and aqueous liquid (brine) in the system haplogranite-H2O-NaCl at 800°C and 100 MPa. Time series experiments demonstrate that equilibrium was reached in about 90 hours. Runs conducted with low-salinity fluids (0--2 wt. % NaCl) show that boron partitions preferentially into the vapor phase over the haplogranitic melt, whereas results from high-salinity (60--80 wt. % NaCI) experiments suggest that boron has no preference for the brine or the melt. Excluding data from runs that may have been conducted beneath the solvus (2 and 60 wt. % NaCl), the bulk fluidmelt partition coefficients for low-salinity and high-salinity experiments are DB(vapor/melt) = 4.79 +/- 1.52 and DB (brine/melt) = 1.07 +/- 0.34, respectively. Integrating these results yielded DB(vapor/brine) = 4.48 +/- 2.03, suggesting that boron partitions preferentially into the vapor over the brine in a boiling hydrothermal fluid. This may have important implications for mineral exploration, as boron is commonly associated with certain metallic mineral deposits as tourmaline.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.79121 |
| Date | January 2003 |
| Creators | Schatz, Oliver J. |
| Contributors | Williams-Jones, A. E. (advisor), Stix, J. (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: 001984146, proquestno: AAIMQ88290, Theses scanned by UMI/ProQuest. |
Page generated in 0.002 seconds