Abstract
The 1bar, thermodynamic properties of crystalline and liquid NaAlSi3O8 are used to calculate the fusion curve of albite to 10 kbar. The calculated temperatures (±2σ) of the melting reaction are 1152 (±7) °C at 3 kbar and 1247 (±24) °C at 10 kbar. The location of the calculated fusion curve to 10 kbar is in excellent agreement with phase-equilibrium constraints on the maximum and minimum temperatures of the fusion curve at 3 and 15 kbar, respectively. Calculation of the melting reaction at pressures >10 kbar requires that the pressure dependence of the liquid compressibility (K0' = dKT,0 / dP, where KT,0 = 1/βT,0) be known. On the basis of five half-reversal, crystallization experiments in the literature, which collectively provide minimum temperatures of the fusion curve between 12 and 32 kbar, K0' (derived from the Birch-Murnaghan relation) is constrained to be ≥10 for liquid NaAlSi3O8. A comparison with other silicate liquids shows that there is a strong, positive correlation between the compressibility at one bar (βT,0) and K0'. In addition, data on the water-saturated fusion curve of albite are used to quantify the effect of small amounts of H2O (≤1 wt%) on lowering the melting temperature of albite (≤68 degrees).
© 2015 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
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- The formation of Sr silicates at low temperature and the solubility product of tobermorite-like Sr5Si6O16(OH)2 .5H2O
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Articles in the same Issue
- A molecular dynamics study of the behavior of sodium in low albite
- Observation and interpretation of paramagnetic defects in Brazilian and Central African carbonados
- Dissolution of gibbsite: Direct observations using fluid cell atomic force microscopy
- Polytypes and higher-order structures of antigorite: A TEM study
- An infrared spectroscopic study of the basic copper phosphate minerals: Cornetite, libethenite, and pseudomalachite
- Influence of F content on the composition of Al-rich synthetic phlogopite: Part I. New information on structure and phase-formation from 29Si, 1H, and 19F MAS NMR spectroscopies
- NMR evidence for formation of octahedral and tetrahedral Al and repolymerization of the Si network during dissolution of aluminosilicate glass and crystal
- Thermodynamic properties of hercynite (FeAl2O4) based on adiabatic calorimetry at low temperatures
- The formation of Sr silicates at low temperature and the solubility product of tobermorite-like Sr5Si6O16(OH)2 .5H2O
- Thermal equation of state of omphacite
- The effect of thermal decarbonation on stable isotope compositions of carbonates
- Synthetic MgAl2O4 (spinel) at high-pressure conditions (0.0001–30 GPa): A synchrotron X-ray powder diffraction study
- The stability of antigorite in the systems MgO-SiO2-H2O (MSH) and MgO-Al2O3-SiO2-H2O (MASH): The effects of Al3+ substitution on high-pressure stability
- The fusion curve of albite revisited and the compressibility of NaAlSi3O8 liquid with pressure
- Correction of secondary X-ray fluorescence near grain boundaries in electron microprobe analysis: Application to thermobarometry of spinel lherzolites
- An overgrowth model to explain multiple, dispersed high-Mn regions in the cores of garnet porphyroblasts
- Synchrotron X-ray diffraction study of the structure and dehydration behavior of todorokite
- Retrograde mineral reactions in saline fluid inclusions: The transformation ferropyrosmalite ↔ clinopyroxene
- The effect of ionizing radiation on uranophane
- Hydration, expansion, structure, and dynamics of layered double hydroxides
- Relict edenite in a garnet lherzolite from the Chinese Su-Lu UHP metamorphic terrane: Implications for metamorphic history
- Norrishite, K(Mn23+Li)Si4O10(O)2, an oxymica associated with sugilite from the Wessels Mine, South Africa: Crystal chemistry and 40Ar-39Ar dating
- The amblygonite (LiAlPO4F)-montebrasite (LiAlPO4OH) solid solution: A combined powder and single-crystal neutron diffraction and solid-state 6Li MAS, CP MAS, and REDOR NMR study
- An X-ray Rietveld, infrared, and Mössbauer spectral study of the NaMn(Fe1–xInx)2(PO4)3 alluaudite-type solid solution
- Gatelite-(Ce), a new REE-bearing mineral from Trimouns, French Pyrenees: Crystal structure and polysomatic relationships with epidote and törnebohmite-(Ce)
- Hydroxyl in clinopyroxene from the deep subducted crust: Evidence for H2O transport into the mantle
- A model for the structure of the hydrated aluminum phosphate, kingite determined by ab initio powder diffraction methods
- The crystal structure of synthetic autunite, Ca[(UO2)(PO4)]2(H2O)11