Thermodynamic and thermophysical properties of selected phases in the MgO-SiO2-H2O-CO2, CaO-Al2O3-SiO2-H2O-CO2, and Fe-FeO-Fe2O3SiO2 chemical systems: With special emphasis on the properties of basalts and their mineral components

Robinson, Gilpin R.; Hass, John L.; Schäfer, C.; Haselton, H. T.

doi:10.3133/ofr8379

Cited by 27 publications

(15 citation statements)

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“…Because the results ofHemley et al (1980) appear to be internally consistent, they are accepted here for both reaction (4) and (5); the results of Thompson (1970) have been ignored. Robinson et al (1982) reached the same conclusions about the data of Kerrick (1968), Velde and Kornprobst (1969), and Thompson (1970).…”

Section: T H E R M O D Y N a M I C Propertiessupporting

confidence: 69%

“…The resulting Gibbs energies are compared in Table 3 with previous compilations (Helgeson et al, 1978;Robie et al, 1979;Robinson et al, 1982;Berman, 1988J. The data in Helgeson et al (1978) are consis-tently less negative than the others, and can be traced to the value they assumed for corundum, which is about 12 kJ/mole less negative than those in the other compilations.…”

Section: Self-consistent Set Of Gibbs Energies and Phase Relationsmentioning

confidence: 77%

“…andalusite, kyanite, and sillimanite came from Robinson et al (1982) and Robie and Hemingway (1984). The calorimetric measurements of Perkins et al (1979) were used to calculate the entropy ofdiaspore.…”

Section: T H E R M O D Y N a M I C Propertiesmentioning

confidence: 99%

“…If these values are combined with the values of the Gibbs energies at STP for reactions (1)-(4) calculated in the present study (Table 2), a consistent set of free energies for the individual phases can be derived. Values for the free energies of H20(v), corundum, and a-quartz were assumed (Robinson et al, 1982) in order to solve for the Gibbs energies of the remaining phases. The uncertainties in the Gibbs energies of reactions (1)- (4), determined from the widths of the reversal brackets, and in the Gibbs energies of formation of andalusite, diaspore, kaolinite, and pyrophyllite are given in Tables 2 and 3.…”

Section: Self-consistent Set Of Gibbs Energies and Phase Relationsmentioning

confidence: 99%

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Metastability in Near-Surface Rocks of Minerals in The System Al₂O₃-SiO₂-H₂O

Anovitz

Perkins

Essene

1991

Clays and clay miner.

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--Gibbs free energies for phases in the system m1203-SiO2-H20 have been calculated from reversed experiments in order to correct earlier values and to calculate a phase diagram consistent with more recent experiments. An internally consistent diagram could not be calculated that agreed with all published experiments, and choices of preferred data were made. The following Gibbs free energies, relative to the elements at STP ( The above values were calculated assuming literature values for corundum, quartz, and H20 (v). Examination of available thermodynamic, experimental, and observational data on the aluminum hydroxides gibbsite, boehmite, bayerite, and nordstrandite suggests that these minerals are metastable with respect to diaspore + water at STP and at higher temperatures. Similarly, halloysite and dickite are metastable with respect to kaolinite at these conditions. The occurrence of these minerals in soils must therefore be ascribed to nonequilibrium processes, and the use of equilibrium phase diagrams to explain their occurrence is inappropriate.

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Section: T H E R M O D Y N a M I C Propertiessupporting

confidence: 69%

Section: Self-consistent Set Of Gibbs Energies and Phase Relationsmentioning

confidence: 77%

Section: T H E R M O D Y N a M I C Propertiesmentioning

confidence: 99%

Section: Self-consistent Set Of Gibbs Energies and Phase Relationsmentioning

confidence: 99%

See 2 more Smart Citations

Metastability in Near-Surface Rocks of Minerals in The System Al₂O₃-SiO₂-H₂O

Anovitz

Perkins

Essene

1991

Clays and clay miner.

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“…We ignore the second-stage dehydration reaction involving talc at yet higher temperatures because it represents only 1.6 wt.% water loss compared to 10.7% for the above reaction. The properties of this model serpentine mineral, the other phases, and this dehydration reaction were extracted from the literature (including Robinson et al (1983)) and are given in Additional file 1: Table S1. This starting subduction model indicates that about 1,300 km 3 per kilometer of margin of forearc mantle is within the stability field of antigorite.…”

Section: Model Mineralogical Detailsmentioning

confidence: 99%

A large mantle water source for the northern San Andreas fault system: a ghost of subduction past

2014

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Recent research indicates that the shallow mantle of the Cascadia subduction margin under near-coastal Pacific Northwest, USA is cold and partially serpentinized, storing large quantities of water in this wedge-shaped region. Such a wedge probably formed to the south in California during an earlier period of subduction. We show by numerical modeling that after subduction ceased with the creation of the San Andreas Fault System (SAFS), the mantle wedge warmed, slowly releasing its water over a period of more than 25 Ma by serpentine dehydration into the crust above. This deep, long-term water source could facilitate fault slip in San Andreas System at low shear stresses by raising pore pressures in a broad region above the wedge. Moreover, the location and breadth of the water release from this model gives insights into the position and breadth of the SAFS. Such a mantle source of water also likely plays a role in the occurrence of non-volcanic tremor (NVT) that has been reported along the SAFS in central California. This process of water release from mantle depths could also mobilize mantle serpentinite from the wedge above the dehydration front, permitting upward emplacement of serpentinite bodies by faulting or by diapiric ascent. Specimens of serpentinite collected from tectonically emplaced serpentinite blocks along the SAFS show mineralogical and structural evidence of high fluid pressures during ascent from depth. Serpentinite dehydration may also lead to tectonic mobility along other plate boundaries that succeed subduction, such as other continental transforms, collision zones, or along present-day subduction zones where spreading centers are subducting.

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Computer simulation of the phase diagram for the MgO-SiO2 system at P - T parameters of the mantle transition zone

et al. 1989

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Abstract. The paper reports an attempt to study the topologies of the phase diagram for the MgO-SiO2 system at high pressure and temperature using computer simulation. Phase equilibria at MgSiO3 stoichiometry is investigated, demonstrating that the invariant point Gr + Ilm + Pv is stable at 21.6 GPa and 2270 K. A thermodynamic data base for minerals in the MgO-SiO2 system is established by supplementing the calorimetric data for low pressure phases and equations of state for low and high pressure phases with data calculated from high pressure synthesis experiments. A refined set of standard free energies of formation and phase transformations in the MgO-SiO2 system is presented. The proposed phase diagram covers a wide range of pressure (up to 25 GPa) and temperature (up to 2500 K) and forms the basis for a geochemical interpretation of the nature of seismic discontinuites in the mantle.

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Thermodynamic and thermophysical properties of selected phases in the MgO-SiO2-H2O-CO2, CaO-Al2O3-SiO2-H2O-CO2, and Fe-FeO-Fe2O3SiO2 chemical systems: With special emphasis on the properties of basalts and their mineral components

Cited by 27 publications

References 0 publications

Metastability in Near-Surface Rocks of Minerals in The System Al₂O₃-SiO₂-H₂O

Metastability in Near-Surface Rocks of Minerals in The System Al₂O₃-SiO₂-H₂O

A large mantle water source for the northern San Andreas fault system: a ghost of subduction past

Computer simulation of the phase diagram for the MgO-SiO2 system at P - T parameters of the mantle transition zone

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Thermodynamic and thermophysical properties of selected phases in the MgO-SiO2-H2O-CO2, CaO-Al2O3-SiO2-H2O-CO2, and Fe-FeO-Fe2O3SiO2 chemical systems: With special emphasis on the properties of basalts and their mineral components

Cited by 27 publications

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Metastability in Near-Surface Rocks of Minerals in The System Al2O3-SiO2-H2O

Metastability in Near-Surface Rocks of Minerals in The System Al2O3-SiO2-H2O

A large mantle water source for the northern San Andreas fault system: a ghost of subduction past

Computer simulation of the phase diagram for the MgO-SiO2 system at P - T parameters of the mantle transition zone

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Product

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Metastability in Near-Surface Rocks of Minerals in The System Al₂O₃-SiO₂-H₂O

Metastability in Near-Surface Rocks of Minerals in The System Al₂O₃-SiO₂-H₂O