Experimental determination of the solubility of the assemblage paragonite,albite, and quartz in supercritical H2O |
| |
| Institution: | 1. American Shale Oil, LLC, Rifle, CO, United States;2. Setaram, Inc., Pleasanton, CA, United States;3. Schlumberger-Doll Research, Cambridge, MA, United States;1. Department of Earth Sciences, University of Cambridge, Downing Site, CB2 3EQ, United Kingdom;2. Department of Engineering, University of Cambridge, Trumpington Street, CB2 1PZ, United Kingdom;1. Changjiang River Scientific Research Institute, Wuhan, Hubei 430010, China;2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China |
| |
| Abstract: | The concentrations of Na, Al, and Si in an aqueous fluid in equilibrium with natural albite, paragonite, and quartz have been measured between 350°C and 500°C and 1 to 2.5 kbar. Si is the dominant solute in solution and is near values reported for quartz solubility in pure H2O. At 1 kbar the concentrations of Na and Al remain fairly constant from 350°C to 425°C but then decrease at 450°C. At 2 kbar, Na increases slightly with increasing temperature while Al remains nearly constant. Concentrations of Si, Na, and Al all increase with increasing pressure at constant temperature.The molality of Al is close to that of Na and is nearly a log unit greater than calculated molalities assuming Al(OH)03 is the dominant Al species. This indicates a Na-Al complex is the dominant Al species in solution as shown by Anderson and Burnham (1983) at higher temperature and pressure. The complex can be written as NaAl(OH)04 ± nSiO2 where n is the number of Si atoms in the complex. The value of n is not well constrained but appears to be less than or equal to 3.The results indicate Al can be readily transported in pure H2O solutions at temperatures and pressures as low as 350°C and 1 kbar. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
