Book contents
- Frontmatter
- Contents
- List of contributors
- Preface
- To the memory of Dmitriy Sergeyevich Korzhinskiy
- List of symbols
- PART I General thermodynamics and mineral equilibria including geothermobarometry
- PART II Metamorphic and metasomatic processes
- PART III The mantle and magmatic processes
- 13 Complications in the melting of silicate minerals from atmospheric to high pressures
- 14 Evolution of the lithosphere, and inferred increasing size of mantle convection cells over geologic time
- 15 Temperatures in and around cooling magma bodies
- 16 Experimental studies of the system Mg2SiO4–SiO2–H2 at pressures 10−2–10−10 bar and at temperatures to 1650 °C: application to condensation and vaporization processes in the primitive solar nebula
- 17 Volatiles in magmatic liquids
17 - Volatiles in magmatic liquids
Published online by Cambridge University Press: 24 November 2009
- Frontmatter
- Contents
- List of contributors
- Preface
- To the memory of Dmitriy Sergeyevich Korzhinskiy
- List of symbols
- PART I General thermodynamics and mineral equilibria including geothermobarometry
- PART II Metamorphic and metasomatic processes
- PART III The mantle and magmatic processes
- 13 Complications in the melting of silicate minerals from atmospheric to high pressures
- 14 Evolution of the lithosphere, and inferred increasing size of mantle convection cells over geologic time
- 15 Temperatures in and around cooling magma bodies
- 16 Experimental studies of the system Mg2SiO4–SiO2–H2 at pressures 10−2–10−10 bar and at temperatures to 1650 °C: application to condensation and vaporization processes in the primitive solar nebula
- 17 Volatiles in magmatic liquids
Summary
Introduction
Volatile contents and distribution of volatile species in magmatic systems can be inferred by direct analysis of volcanic gas, analysis of fluid inclusions and gas contents of glass inclusions in phenocryst and xenocrysts. Information can also be obtained by indirect methods based on observed phase relations and phase chemistry and by theoretical analysis of activity – composition relations in appropriate systems. The principal volatiles in magmatic systems can be described with the system C–H–O–S–F. The volatiles in volcanic gases generally are quite oxidized and CO2, H2O and SO2 are the main gas species (e.g., Anderson, 1975, Gerlach & Nordlie, 1975, Casadewall et al., 1987). Gas compositions from volcanoes along convergent plate boundaries generally are water-rich with carbon dioxide as the second most important volatile component, (Muenow et al., 1977, Helgeson et al., 1978, Rutherford et al., 1984), whereas the gases in mid-ocean ridge basalts and basalts from oceanic islands contain principally SO2 and CO2 (e.g., Mathez & Delaney, 1981, Greenland, 1987) although others (see, for example, Gerlach, 1980) have suggested that H2O is more important than previously recognized.
Information on volatile compositions at depth in the earth is less direct and relies on analysis of fluid inclusions in phenocrysts (Roedder, 1965, Murck et al., 1978), gas content of glass inclusions in phenocrysts (Delaney et al., 1977, 1978) and activity–composition relations derived from volatile-containing mineral parageneses in igneous rocks (e.g., amphibole, mica, sulfide and carbonate minerals).
- Type
- Chapter
- Information
- Progress in Metamorphic and Magmatic PetrologyA Memorial Volume in Honour of D. S. Korzhinskiy, pp. 435 - 476Publisher: Cambridge University PressPrint publication year: 1991
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