Change in the dissolution rates of alkali feldspars as a result of secondary mineral precipitation and approach to equilibrium

Alekseyev, V. A.; Medvedeva, L. S.; Prisyagina, N. I.; Meshalkin, S. S.; Balabin, Aleksey I.

doi:10.1016/s0016-7037(96)00405-x

Cited by 112 publications

(114 citation statements)

References 41 publications

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“…Albite dissolution-sanidine precipitation experiments Alekseyev et al (1997) conducted a series of batch experiments for low albite (Na 0.97 K 0.02 AlSi 3.01 O 8 ) dissolution in 0.1 m KHCO 3 fluid. The experiments were conducted at 300°C and 88 bars and pH $9.0 (buffered by bicarbonate).…”

Section: Modeling Results and Analysesmentioning

confidence: 99%

“…However, a number of experiments near equilibrium have shown that the actual relationship between r j and DG r deviates from this so-called linear kinetics (Schramke et al, 1987;Nagy et al, 1991;Nagy andLasaga, 1992, 1993;Burch et al, 1993;Gautier et al, 1994;Alekseyev et al, 1997;Cama et al, 2000;Taylor et al, 2000;Beig and Lü ttge, 2006;Hellmann and Tisserand, 2006). As shown below, the linear TST rate law also cannot fit the experimental data of Zhu and Lu (2009).…”

mentioning

confidence: 95%

“…(1) Haar et al (1984); (2) Tagirov and Schott (2001); (3) Sverjensky et al (1997); (4) McCollom and Shock (1997); (5) Ho et al (2000); (6) Holland and Powell (1998) for minerals and (1), (2), and (3) for aqueous species; (7) Hemingway et al (1991) for boehmite; (8) Alekseyev et al (1997). first term is equivalent to Eq. (4) if n 1 = p, m 1 = 1, and q = 1.…”

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confidence: 99%

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Coupled alkali feldspar dissolution and secondary mineral precipitation in batch systems: 4. Numerical modeling of kinetic reaction paths

Zhu

Lü

Zheng

et al. 2010

Geochimica et Cosmochimica Acta

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This paper explores how dissolution and precipitation reactions are coupled in batch reactor experimental systems at elevated temperatures. This is the fourth paper in our series of "Coupled Alkali Feldspar Dissolution and Secondary Mineral Precipitation in Batch Systems". In our third paper, we demonstrated via speciation-solubility modeling that partial equilibrium between secondary minerals and aqueous solutions was not attained in feldspar hydrolysis batch reactors at 90-300°C and that a strong coupling between dissolution and precipitation reactions follows as a consequence of the slower precipitation of secondary minerals ). Here, we develop this concept further by using numerical reaction path models to elucidate how the dissolution and precipitation reactions are coupled. Modeling results show that a quasi-steady state was reached. At the quasi-steady state, dissolution reactions proceeded at rates that are orders of magnitude slower than the rates measured at far from equilibrium. The quasi-steady state is determined by the relative rate constants, and strongly influenced by the function of Gibbs free energy of reaction (DG r ) in the rate laws.To explore the potential effects of fluid flow rates on the coupling of reactions, we extrapolate a batch system (Ganor et al., 2007) to open systems and simulated one-dimensional reactive mass transport for oligoclase dissolution and kaolinite precipitation in homogeneous porous media. Different steady states were achieved at different locations along the one-dimensional domain. The time-space distribution and saturation indices (SI) at the steady states were a function of flow rates for a given kinetic model. Regardless of the differences in SI, the ratio between oligoclase dissolution rates and kaolinite precipitation rates remained 1.626, as in the batch system case (Ganor et al., 2007). Therefore, our simulation results demonstrated coupling among dissolution, precipitation, and flow rates.Results reported in this communication lend support to our hypothesis that slow secondary mineral precipitation explains part of the well-known apparent discrepancy between lab measured and field estimated feldspar dissolution rates (Zhu et al., 2004). Here we show how the slow secondary mineral precipitation provides a regulator to explain why the systems are held close to equilibrium and show how the most often-quoted "near equilibrium" explanation for an apparent field-lab discrepancy can work quantitatively. The substantiated hypothesis now offers the promise of reconciling part of the apparent fieldlab discrepancy.

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Section: Modeling Results and Analysesmentioning

confidence: 99%

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confidence: 95%

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Coupled alkali feldspar dissolution and secondary mineral precipitation in batch systems: 4. Numerical modeling of kinetic reaction paths

Zhu

Lü

Zheng

et al. 2010

Geochimica et Cosmochimica Acta

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“…During this slow dissolution, a surface layer is considered to form on the feldspar surface (Busenberg and Clemency, 1976;Alekseyev et al, 1997;Zhu, 2005;Zhu and Lu, 2009). Interestingly, this slow dissolution of microcline is accompanied with only a slight reduction in IN efficiency even after several months as shown in experiments by Peckhaus et al (2016) and Harrison et al (2016).…”

Section: Aging Effectmentioning

confidence: 99%

Enhanced ice nucleation efficiency of microcline immersed in dilute NH3 and NH4+-containing solutions

Kumar

Marcolli

Luo

et al. 2018

Preprint

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solutes and the microcline surface not captured by the water-activity-based approach. One such interaction is the exchange of K + available on the microcline surface with externally added cations (e.g.NH ). However, the presence of a similar increase in IN efficiency in dilute ammonia solutions indicates that the cation exchange cannot explain the increase in IN temperatures. Instead, we hypothesize that NH3 molecules hydrogen bonded on the microcline surface form an ice-like overlayer, which provides hydrogen bonding favorable for ice to nucleate on, thus enhancing both the freezing temperatures and the heterogeneously frozen 25 fraction in dilute NH3 and NH solutions. Moreover, we show that aging of microcline in concentrated solutions over several days does not impair IN efficiency permanently in case of near neutral solutions since most of it recovers when aged particles are re-suspended in pure water. In contrast, exposure to severe acidity (pH < 1.2) or alkalinity (pH > 11.7) damages the microcline surface, hampering or even destroying the IN efficiency irreversibly. Implications for ice nucleation on airborne dust containing microcline might be multifold, ranging from a reduction of immersion freezing when exposed to dry, cold and NH3/NH -free 30 conditions, to a 5-K enhancement during condensation freezing when microcline particles experience high humidity ( > 0.96) at warm (252 -257 K) and NH3/NH -rich conditions. Atmos. Chem. Phys. Discuss., https://doi

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“…Also, the surface areas of calcite grains measuring 100-200 lm by BET method were reported as 662 cm 2 /g according to Pokrovsky et al (2005). The specific surface areas of clean K-feldspar and quartz grains measuring 50-100 lm by BET method were reported as 955 and 945 cm 2 /g, respectively (Harouiya and Oelkers 2004), that for K-feldspar grains measuring 50-100 lm was 1400 cm 2 /g (Alekseyev et al 1997). Specific surface areas of clean analcite grains measuring 63-75, 45-63, and 32-45 lm by BET method were reported as 1700 and 2100 cm 2 /g, respectively (Savage et al 1999).…”

Section: Kinetic Datamentioning

confidence: 99%

Selective dissolution of eodiagenesis cements and its impact on the quality evolution of reservoirs in the Xing’anling Group, Suderte Oil Field, Hailar Basin, China

et al. 2016

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Reservoirs in the Xing'anling Group in the Suderte Oil Field, Hailar Basin exhibit ultra-low to low permeability and high tuffaceous material content. This study comprehensively analyzed diagenesis and quality evolution of these low-permeability reservoirs using thin sections, SEM samples, rock physical properties, pore water data, as well as geochemical numerical simulations. Calcite and analcite are the two main types of cements precipitated in the eodiagenetic stage at shallow burial depths in the reservoirs. These two cements occupied significant primary intergranular pores and effectively retarded deep burial compaction. Petrography textures suggest selective dissolution of massive analcite and little dissolution of calcite in the mesodiagenetic stage. Chemical calculations utilizing the Geochemist's Workbench 9.0 indicated that the equilibrium constant of the calcite leaching reaction is significantly smaller than that of the analcite leaching reaction, resulting in extensive dissolution of analcite rather than calcite in the geochemical system with both minerals present. Numerical simulations with constraints of kinetics and pore water chemistry demonstrated that the pore water in the Xing'anling group is saturated with respect to calcite, but undersaturated with analcite, leading to dissolution of large amounts of analcite and no dissolution of calcite. Significant secondary intergranular pores have formed in analcite-cemented reservoirs from selective dissolution of analcite in the mesodiagenetic stage; the analcite dissolution formed preferential flow paths in the reservoirs, which promoted feldspar dissolution; and dissolution of such minerals led to the present reservoirs with medium porosity and low permeability. Calcite-cemented tight reservoirs have not experienced extensive dissolution of cements, so they exhibit ultra-low porosity and permeability.

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Change in the dissolution rates of alkali feldspars as a result of secondary mineral precipitation and approach to equilibrium

Cited by 112 publications

References 41 publications

Coupled alkali feldspar dissolution and secondary mineral precipitation in batch systems: 4. Numerical modeling of kinetic reaction paths

Coupled alkali feldspar dissolution and secondary mineral precipitation in batch systems: 4. Numerical modeling of kinetic reaction paths

Enhanced ice nucleation efficiency of microcline immersed in dilute NH<sub>3</sub> and NH<sub>4</sub><sup>+</sup>-containing solutions

Selective dissolution of eodiagenesis cements and its impact on the quality evolution of reservoirs in the Xing’anling Group, Suderte Oil Field, Hailar Basin, China

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Change in the dissolution rates of alkali feldspars as a result of secondary mineral precipitation and approach to equilibrium

Cited by 112 publications

References 41 publications

Coupled alkali feldspar dissolution and secondary mineral precipitation in batch systems: 4. Numerical modeling of kinetic reaction paths

Coupled alkali feldspar dissolution and secondary mineral precipitation in batch systems: 4. Numerical modeling of kinetic reaction paths

Enhanced ice nucleation efficiency of microcline immersed in dilute NH&lt;sub&gt;3&lt;/sub&gt; and NH&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;+&lt;/sup&gt;-containing solutions

Selective dissolution of eodiagenesis cements and its impact on the quality evolution of reservoirs in the Xing’anling Group, Suderte Oil Field, Hailar Basin, China

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Enhanced ice nucleation efficiency of microcline immersed in dilute NH<sub>3</sub> and NH<sub>4</sub><sup>+</sup>-containing solutions