In situ Raman spectroscopic investigation of the structure of subduction-zone fluids
Journal of Geophysical Research B: Solid Earth
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Abstract
In situ Raman spectra of synthetic subduction-zone fluids (KAlSi3O8-H2O system) were measured to 900?? and 2.3 GPa using a hydrothermal diamond-anvil cell. The structures of aqueous fluid and hydrous melt become closer when conditions approach the second critical endpoint. Almost no three-dimensional network was observed in the supercritical fluid above 2 GPa although a large amount of silicate component is dissolved, suggesting that the physical and chemical properties of these phases change drastically at around the second critical endpoint. Our experimental results indicate that the fluids released from a subducting slab change from aqueous fluid to supercritical fluid with increasing depth under the volcanic arcs. Copyright 2008 by the American Geophysical Union.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | In situ Raman spectroscopic investigation of the structure of subduction-zone fluids |
| Series title | Journal of Geophysical Research B: Solid Earth |
| DOI | 10.1029/2007JB005179 |
| Volume | 113 |
| Issue | 4 |
| Year Published | 2008 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Geophysical Research B: Solid Earth |
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