Aluminum speciation in aqueous fluids at deep crustal pressure and temperature

Mookherjee, Mainak; Keppler, Hans; Manning, Craig E.

doi:10.1016/j.gca.2014.02.016

Cited by 23 publications

(16 citation statements)

References 57 publications

(67 reference statements)

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“…As with Si, highly polymerized Al is known at ambient conditions at extremes in pH where Al concentration may be high. At high P and T, Al concentration in corundumsaturated H 2 O is modest (Tropper & Manning 2007), and alumina does not detectibly polymerize with itself (Mookherjee et al 2014). However, Al interactions with silica are extensive at deepcrustal conditions and lead to dramatically higher aqueous Al concentrations (Manning 2007).…”

Section: Aluminosilicate Polymerizationmentioning

confidence: 99%

Fluids of the Lower Crust: Deep Is Different

Manning

2018

Annu. Rev. Earth Planet. Sci.

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122

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Deep fluids are important for the evolution and properties of the lower continental and arc crust in tectonically active settings. They comprise four components: H2O, nonpolar gases, salts, and rock-derived solutes. Contrasting behavior of H2O-gas and H2O-salt mixtures yields immiscibility and potential separation of phases with different chemical properties. Equilibrium thermodynamic modeling of fluid-rock interaction using simple ionic species known from shallow-crustal systems yields solutions too dilute to be consistent with experiments and resistivity surveys, especially if CO2 is added. Therefore, additional species must be present, and H2O-salt solutions likely explain much of the evidence for fluid action in high-pressure settings. At low salinity, H2O-rich fluids are powerful solvents for aluminosilicate rock components that are dissolved as polymerized clusters. Addition of salts changes solubility patterns, but aluminosilicate contents may remain high. Fluids with Xsalt = 0.05 to 0.4 in equilibrium with model crustal rocks have bulk conductivities of 10−1.5 to 100 S/m at porosity of 0.001. Such fluids are consistent with observed conductivity anomalies and are capable of the mass transfer seen in metamorphic rocks exhumed from the lower crust.

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Section: Aluminosilicate Polymerizationmentioning

confidence: 99%

Fluids of the Lower Crust: Deep Is Different

Manning

2018

Annu. Rev. Earth Planet. Sci.

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122

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“…It means that another form of aluminum determines the solubility of Al 2 O 3 (s) in water. Indeed, the Raman spectra of dense aqueous solutions at high T and P in equilibrium with corundum (Mookherjee et al, 2014) give evidence of existence of a hydrated neutral form Al(OH) 3 (H 2 O).…”

Section: Application For Solubility Of Corundum In Water At 9732 Kmentioning

confidence: 99%

Correlation and prediction of thermodynamic properties of nonelectrolytes at infinite dilution in water over very wide temperature and pressure ranges (2000K and 10GPa)

Plyasunov

2015

Geochimica et Cosmochimica Acta

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“…Aqueous geochemical reactions involving aluminium, [4] silicates, [5][6][7] magnesium, [7,8] carbonates, [9] sulfur, [10] and boron [11] have been examined experimentally in situ via diamond-anvil cells coupled to Raman spectroscopy in an attempt to extract thermodynamic properties. New species are often inferred from slight changes to the broad bandstretching frequencies.…”

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confidence: 99%

A High‐Pressure NMR Probe for Aqueous Geochemistry

Pautler¹,

Colla²,

Johnson³

et al. 2014

Angew Chem Int Ed

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A non-magnetic piston-cylinder pressure cell is presented for solution-state NMR spectroscopy at geochemical pressures. The probe has been calibrated up to 20 kbar using in situ ruby fluorescence and allows for the measurement of pressure dependencies of a wide variety of NMR-active nuclei with as little as 10 μL of sample in a microcoil. Initial (11)B NMR spectroscopy of the H3BO3-catechol equilibria reveals a large pressure-driven exchange rate and a negative pressure-dependent activation volume, reflecting increased solvation and electrostriction upon boron-catecholate formation. The inexpensive probe design doubles the current pressure range available for solution NMR spectroscopy and is particularly important to advance the field of aqueous geochemistry.

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Aluminum speciation in aqueous fluids at deep crustal pressure and temperature

Cited by 23 publications

References 57 publications

Fluids of the Lower Crust: Deep Is Different

Fluids of the Lower Crust: Deep Is Different

Correlation and prediction of thermodynamic properties of nonelectrolytes at infinite dilution in water over very wide temperature and pressure ranges (2000K and 10GPa)

A High‐Pressure NMR Probe for Aqueous Geochemistry

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