Article
Licensed
Unlicensed
Requires Authentication
Carbon speciation in silicate-C-O-H melt and fluid as a function of redox conditions: An experimental study, in situ to 1.7 GPa and 900 °C
-
Bjorn Mysen
Published/Copyright:
April 3, 2015
Abstract
Carbon speciation in and partitioning among silicate-saturated C-O-H fluids and (C-O-H)-saturated melts have been determined ∼1.7 GPa and 900 °C under reducing and oxidizing conditions. The measurements were conducted in situ while the samples were at the conditions of interest. The solution equilibria were (1) 2CH4 + Qn = 2CH3− + H2O + Qn+1 and (2) 2CO32- + H2O + 2Qn+1 = HCO3− + 2Qn, under reducing and oxidizing conditions, and where the superscript, n, in the Qn-species denotes number of bridging oxygen in the silicate species (Q-species). The abundance ratios, CH3/CH4 and HCO3−/CO32-, increase with temperature. The enthalpy change associated with the species transformation differs for fluids and melts and also for oxidized and reduced carbon [Reducing: ΔH(1)fluid = 16 ± 5 kJ/mol, ΔH(1) melt = 50 ± 5 kJ/mol; oxidizing ΔH(2) fluid = 81 ± 14 kJ/mol]. For the exchange equilibrium of CH4 and CH3 species between fluid and melt, the temperature-dependent equilibrium constant, (XCH₄/XCH₃)fluid/(XCH₄/ XCH₃)melt, yields ΔH = 34 ± 3 kJ/mol. \
Increased abundance ratios, CH₄/CH₃ and HCO3− /CO32-, lead to increased polymerization of silicate+(C-O-H) melt. Because of such relations, melt transport properties (e.g., viscosity) and element partition coefficients between magmatic liquids, C-O-H fluids, and crystalline phases can vary by more than 100% with speciation changes of C-bearing volatiles upper mantle. These structure effects are more pronounced the higher the pressure and the more mafic the magma.
Received: 2014-3-14
Accepted: 2014-9-30
Published Online: 2015-4-3
Published in Print: 2015-4-1
© 2015 by Walter de Gruyter Berlin/Boston
You are currently not able to access this content.
You are currently not able to access this content.
Articles in the same Issue
- Highlights and Breakthroughs. Clays are messy—also on Mars
- Highlights and Breakthroughs. Tweed, Twins, and Holes: A link between mineralogy and materials science
- Highlights and Breakthroughs. Bursting the bubble of melt inclusions
- Review. Mineralogy, materials science, energy, and environment: A 2015 perspective
- Crossroads in Earth and Planetary Materials. Block-by-block and layer-by-layer growth modes in coral skeletons
- Roebling Medal Paper. Toward theoretical mineralogy: A bond-topological approach
- Investigating Petrologic Indicators of Magmatic Processes in Volcanic Rocks. Petalite under pressure: Elastic behavior and phase stability
- Investigating Petrologic Indicators of Magmatic Processes in Volcanic Rocks. Pre-eruptive magma mixing and crystal transfer revealed by phenocryst and microlite compositions in basaltic andesite from the 2008 eruption of Kasatochi Island volcano
- What Lurks in the Martian Rocks and Soil? Investigations of Sulfates, Phosphates, and Perchlorates. Akaganéite and schwertmannite: Spectral properties and geochemical implications of their possible presence on Mars
- Special Collection: Mechanisms, Rates, and Timescales of Geochemical Transport Processes in the Crust and Mantle. Timescales of exhumation and cooling inferred by kinetic modeling: An example using a lamellar garnet pyroxenite from the Variscan Granulitgebirge, Germany
- Special Collection: Glasses, Melts, and Fluids, as Tools for Understanding Volcanic Processes and Hazards. Constraints on the origin of sub-effusive nodules from the Sarno (Pomici di Base) eruption of Mt. Somma-Vesuvius (Italy) based on compositions of silicate-melt inclusions and clinopyroxene
- Special Collection: Glasses, Melts, and Fluids, as Tools for Understanding Volcanic Processes and Hazards. Experiments and models on H2O retrograde solubility in volcanic systems
- Special Collection: Glasses, Melts, and Fluids, as Tools for Understanding Volcanic Processes and Hazards. Melt inclusion CO2 contents, pressures of olivine crystallization, and the problem of shrinkage bubbles
- Special Collection: Glasses, Melts, and Fluids, as Tools for Understanding Volcanic Processes and Hazards. Spatio-temporal constraints on magma storage and ascent conditions in a transtensional tectonic setting: The case of the Terceira Island (Azores)
- Special Collection: Glasses, Melts, and Fluids, as Tools for Understanding Volcanic Processes and Hazards. Bubbles matter: An assessment of the contribution of vapor bubbles to melt inclusion volatile budgets
- The origin and implications of clay minerals from Yellowknife Bay, Gale crater, Mars
- The whole-block approach to measuring hydrogen diffusivity in nominally anhydrous minerals
- Atom probe tomography of isoferroplatinum
- Structural investigation of (130) twins and rutile precipitates in chrysoberyl crystals from Rio das Pratinhas in Bahia (Brazil)
- Carbon speciation in silicate-C-O-H melt and fluid as a function of redox conditions: An experimental study, in situ to 1.7 GPa and 900 °C
- Kinetic behavior of partially dehydroxylated kaolinite
- The fall and rise of metamorphic zircon
- Eckermannite revised: The new holotype from the Jade Mine Tract, Myanmar—crystal structure, mineral data, and hints on the reasons for the rarity of eckermannite
- In-situ oxygen isotope and trace element geothermometry of rutilated quartz from Alpine fissures
- Synchrotron micro-spectroscopic examination of Indonesian nickel laterites
- Density functional investigation of the thermo-physical and thermo-chemical properties of 2M1 muscovite
- Complex IR spectra of OH– groups in silicate glasses: Implications for the use of the 4500 cm–1 IR peak as a marker of OH– groups concentration
- Versatile Monazite: Resolving Geological Records and Solving Challenges in Materials Science. Monazite, zircon, and garnet growth in migmatitic pelites as a record of metamorphism and partial melting in the East Humboldt Range, Nevada
- The Second Conference on the Lunar Highlands Crust and New Directions. Revised mineral and Mg# maps of the Moon from integrating results from the Lunar Prospector neutron and gamma-ray spectrometers with Clementine spectroscopy
- The Second Conference on the Lunar Highlands Crust and New Directions. Low-pressure crystallization of a volatile-rich lunar basalt: A means for producing local anorthosites?
- Fluids in the Crust. Experimental constraints on fluid-rock reactions during incipient serpentinization of harzburgite
- Minerals in the human body. Crystal chemical and structural modifications of erionite fibers leached with simulated lung fluids
- Letter. Competition between two redox states in silicate melts: An in-situ experiment at the Fe K-edge and Eu L3-edge
Articles in the same Issue
- Highlights and Breakthroughs. Clays are messy—also on Mars
- Highlights and Breakthroughs. Tweed, Twins, and Holes: A link between mineralogy and materials science
- Highlights and Breakthroughs. Bursting the bubble of melt inclusions
- Review. Mineralogy, materials science, energy, and environment: A 2015 perspective
- Crossroads in Earth and Planetary Materials. Block-by-block and layer-by-layer growth modes in coral skeletons
- Roebling Medal Paper. Toward theoretical mineralogy: A bond-topological approach
- Investigating Petrologic Indicators of Magmatic Processes in Volcanic Rocks. Petalite under pressure: Elastic behavior and phase stability
- Investigating Petrologic Indicators of Magmatic Processes in Volcanic Rocks. Pre-eruptive magma mixing and crystal transfer revealed by phenocryst and microlite compositions in basaltic andesite from the 2008 eruption of Kasatochi Island volcano
- What Lurks in the Martian Rocks and Soil? Investigations of Sulfates, Phosphates, and Perchlorates. Akaganéite and schwertmannite: Spectral properties and geochemical implications of their possible presence on Mars
- Special Collection: Mechanisms, Rates, and Timescales of Geochemical Transport Processes in the Crust and Mantle. Timescales of exhumation and cooling inferred by kinetic modeling: An example using a lamellar garnet pyroxenite from the Variscan Granulitgebirge, Germany
- Special Collection: Glasses, Melts, and Fluids, as Tools for Understanding Volcanic Processes and Hazards. Constraints on the origin of sub-effusive nodules from the Sarno (Pomici di Base) eruption of Mt. Somma-Vesuvius (Italy) based on compositions of silicate-melt inclusions and clinopyroxene
- Special Collection: Glasses, Melts, and Fluids, as Tools for Understanding Volcanic Processes and Hazards. Experiments and models on H2O retrograde solubility in volcanic systems
- Special Collection: Glasses, Melts, and Fluids, as Tools for Understanding Volcanic Processes and Hazards. Melt inclusion CO2 contents, pressures of olivine crystallization, and the problem of shrinkage bubbles
- Special Collection: Glasses, Melts, and Fluids, as Tools for Understanding Volcanic Processes and Hazards. Spatio-temporal constraints on magma storage and ascent conditions in a transtensional tectonic setting: The case of the Terceira Island (Azores)
- Special Collection: Glasses, Melts, and Fluids, as Tools for Understanding Volcanic Processes and Hazards. Bubbles matter: An assessment of the contribution of vapor bubbles to melt inclusion volatile budgets
- The origin and implications of clay minerals from Yellowknife Bay, Gale crater, Mars
- The whole-block approach to measuring hydrogen diffusivity in nominally anhydrous minerals
- Atom probe tomography of isoferroplatinum
- Structural investigation of (130) twins and rutile precipitates in chrysoberyl crystals from Rio das Pratinhas in Bahia (Brazil)
- Carbon speciation in silicate-C-O-H melt and fluid as a function of redox conditions: An experimental study, in situ to 1.7 GPa and 900 °C
- Kinetic behavior of partially dehydroxylated kaolinite
- The fall and rise of metamorphic zircon
- Eckermannite revised: The new holotype from the Jade Mine Tract, Myanmar—crystal structure, mineral data, and hints on the reasons for the rarity of eckermannite
- In-situ oxygen isotope and trace element geothermometry of rutilated quartz from Alpine fissures
- Synchrotron micro-spectroscopic examination of Indonesian nickel laterites
- Density functional investigation of the thermo-physical and thermo-chemical properties of 2M1 muscovite
- Complex IR spectra of OH– groups in silicate glasses: Implications for the use of the 4500 cm–1 IR peak as a marker of OH– groups concentration
- Versatile Monazite: Resolving Geological Records and Solving Challenges in Materials Science. Monazite, zircon, and garnet growth in migmatitic pelites as a record of metamorphism and partial melting in the East Humboldt Range, Nevada
- The Second Conference on the Lunar Highlands Crust and New Directions. Revised mineral and Mg# maps of the Moon from integrating results from the Lunar Prospector neutron and gamma-ray spectrometers with Clementine spectroscopy
- The Second Conference on the Lunar Highlands Crust and New Directions. Low-pressure crystallization of a volatile-rich lunar basalt: A means for producing local anorthosites?
- Fluids in the Crust. Experimental constraints on fluid-rock reactions during incipient serpentinization of harzburgite
- Minerals in the human body. Crystal chemical and structural modifications of erionite fibers leached with simulated lung fluids
- Letter. Competition between two redox states in silicate melts: An in-situ experiment at the Fe K-edge and Eu L3-edge
