| Abstract: | The two-phase boundary of seawater was determined by isothermal decompression of fully condensed seawater in the range of 200-500??C. The pressure at which phase separation occurred for each isotherm was determined by a comparison of the refractive index of fluid removed from the top and bottom of the reaction vessel. The critical point was determined to be in the range of 403-406??C, 285-302 bar and was located by the inflection in the two-phase boundary and by the relative volume of fluid and vapor as a function of temperature. The two-phase boundary of 3.2% NaCl solution was found to coincide exactly with that of seawater over the range tested in the present study. The boundary for both is described by a single seventh-order polynomial equation. The two-phase boundary defines the maximum temperature of seawater circulating at depth in the oceanic crust. Thus the boundary puts a limit of about 390??C for seawater circulating near the seafloor at active ocean ridges (2.5 km water depth), and about 465??C at the top of a magma chamber occurring at 2 km below the seafloor. ?? 1984. |
| Genre: | Article |
| ProdID: | 70013305 |
| Citation Author: | Bischoff, J. L.; Rosenbauer, R. J. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | 180 |
| Citation Issue: | 1 |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | Earth and Planetary Science Letters |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | 9 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | The critical point and two-phase boundary of seawater, 200-500??C; 1984; Article; Journal; Earth and Planetary Science Letters; Bischoff, J. L.; Rosenbauer, R. J. |
| Citation Start Page: | 172 |
| Citation Volume: | 68 |
| Citation Year: | 1984 |
| Type: | citation/reference |
| Text: | The critical point and two-phase boundary of seawater, 200-500??C; 1984; Article; Journal; Earth and Planetary Science Letters; Bischoff, J. L.; Rosenbauer, R. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1984 00:00 -0600 |
| Publisher: | |
