Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Site Tools

  • AAAS
  • Subscribe
  • Feedback

Site Search

Search Advanced

Science 26 February 1999:
Vol. 283. no. 5406, pp. 1314 - 1317
DOI: 10.1126/science.283.5406.1314
Prev | Table of Contents | Next

Reports

The Density of Hydrous Magmatic Liquids

Frederick A. Ochs III, Rebecca A. Lange

Density measurements on several hydrous (<=19 mole percent of H2O) silicate melts demonstrate that dissolved water has a partial molar volume (<A><AC>V</AC><AC>&cjs1171;</AC></A>H2O) that is independent of the silicate melt composition, the total water concentration, and the speciation of water. The derived value for <A><AC>V</AC><AC>&cjs1171;</AC></A>H2O is 22.9 ± 0.6 cubic centimeters per mole at 1000°C and 1 bar of pressure, whereas the partial molar thermal expansivity (partial <A><AC>V</AC><AC>&cjs1171;</AC></A>H2O/partial T) and compressibility (partial <A><AC>V</AC><AC>&cjs1171;</AC></A>H2O/partial P) are 9.5 ± 0.8 × 10-3 cubic centimeters per mole per kelvin and -3.2 ± 0.6 × 10-4 cubic centimeters per mole per bar, respectively. The effect of 1 weight percent dissolved H2O on the density of a basaltic melt is equivalent to increasing the temperature of the melt by ~400°C or decreasing the pressure of the melt by ~500 megapascals. These measurements are used to illustrate the viability of plagioclase sinking in iron-rich basaltic liquids and the dominance of compositional convection in hydrous magma chambers.

Department of Geological Sciences, University of Michigan, Ann Arbor, MI 48109-1063, USA.

Read the Full Text


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
An Experimental Investigation of the Influence of Water and Oxygen Fugacity on Differentiation of MORB at 200 MPa.
J. BERNDT, J. KOEPKE, and F. HOLTZ (2005)
J. Petrology 46, 135-167
   Abstract »    Full Text »    PDF »
Crustal Growth by Magmatic Accretion Constrained by Metamorphic P-T Paths and Thermal Models of the Kohistan Arc, NW Himalayas.
T. YOSHINO and T. OKUDAIRA (2004)
J. Petrology 45, 2287-2302
   Abstract »    Full Text »    PDF »
Constraints on the preeruptive volatile concentrations in the Columbia River flood basalts.
(2002)
Geology 30, 179-182
Determination of the limiting fictive temperature of silicate glasses from calorimetric and dilatometric methods: Application to low-temperature liquid volume measurements.
J. A. Tangeman and R. A. Lange (2001)
American Mineralogist 86, 1331-1344
   Abstract »    Full Text »    PDF »


ADVERTISEMENT
Click Me!

ADVERTISEMENT
Click Me!

To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)