Mineral sequences in precipitation/dissolution waves

Bryant, Steven L.; Schechter, R.S.; Lake, Larry W.

doi:10.1002/aic.690330805

Cited by 40 publications

(13 citation statements)

References 14 publications

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“…Shock structure of a dissolution/precipitation wave (in the presence of diffusion) (after Bryant et al, 1987). The concentration profiles show a single discontinuity at z Z 0, separating the regions of constant states in the upstream from that in the downstream.…”

Section: Figure 15mentioning

confidence: 99%

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The characteristic target-pattern regional ore zonality of the Nanling region, China (III)

2011

Geoscience Frontiers

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By applying the 'theory of synchronization' from the science of complexity to studying the regional regularity of ore formation within the Nanling region of South China, a characteristic target-pattern regional ore zonality has been discovered. During the early and late Yanshanian epoch (corresponding respectively to the Jurassic and Cretaceous periods), two centers of ore formation emerged successively in the Nanling region; the former is mainly for rare metals (W, Sn, Mo, Bi, Nb) and one rareearth element (La) and was generated in the Jurassic period; whereas the latter is mainly for base metals (Cu, Pb, Zn, Sb, Hg), noble metals (Au, Ag), and one radioactive element (U) and was generated in the Cretaceous period. Centers of ore formation were brought about by interface dynamics respectively at the Qitianling and Jiuyishan districts in southern Hunan Province. The characteristic giant nonlinear targetpattern regional ore zonality was generated respectively from the two centers of ore formation by the spatio-temporal synchronization process of the Nanling complex metallogenic system. It induced the collective dynamics and cooperative behavior of the system and displayed the configuration of the regional ore zonality. Then dynamical clustering transformed the configuration into rudimentary ordered coherent structures. Phase dynamics eventually defined the spatio-temporal structures of the target-pattern regional ore zonality and determined their localization and distribution. The integral successive processes of synchronization-dynamical clustering-phase dynamics accomplished the regional ore zonality by way of "multiple field dynamics" of spatio-temporal superposition of multiple coupled pulsatory solitary wave trains of the zonal sequences of different ores. A new methodology for revealing regional ore zonality * Tel.: þ86 10 62306828.

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Section: Figure 15mentioning

confidence: 99%

“…(4)) (after Bryant et al, 1987). t: dimensionless time; x: dimensionless distance; : perturbation induced by the injection of fluid; R: region of constant composition; D: downstream; U: upstream; straight line: dissolution/precipitation waves; slope of straight line: velocity of propagation for chemical waves.…”

Section: Figure 12mentioning

confidence: 99%

The characteristic target-pattern regional ore zonality of the Nanling region, China (III)

2011

Geoscience Frontiers

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“…The algebraic calculation scheme is discussed in detail elsewhere (Bryant et al, 1987;Bryant, 1986;Walsh et al, 1984). We summarize the important points and extensions here.…”

Section: Algebraic Calculation Schemementioning

confidence: 99%

Rule‐based mineral sequences in geochemical flow processes

1988

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The infiltration of an aqueous solution into a permeable medium generally results in the dissolution of some of the minerals initially present and the possible precipitation of others. When the infiltration velocities are small, as is the case for many natural processes, conditions of local equilibrium apply and the dissolution and precipitation processes exhibit a wave-type behavior reminiscent of chromatographic fronts.Zones of constant composition (state) will be separated by narrow regions within which the aqueous and solid phase concentrations exhibit sharp changes. Because of this wave-like structure, an algebraic solution of the coupled material balance equations exists, but in a form that involves a trial and error solution procedure which has heretofore discouraged its application. This paper describes the essence of a scheme which uses a combination of graph theory and heuristics to minimize trials and thereby render the algebraic solution practical. The scheme offers an alternative to time-sequencing solutions (e.g., finite difference) of the set of partial differential equations.

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“…For our problem, shock waves are retarded chemical fronts that form as a result of a complete dissolution of a salt. Here, the number of shocks is equal to the number of salts being dissolved [10]. Contact discontinuities are transport waves that advance a concentration variation whenever there is no chemical reaction happening, i.e.…”

Section: Helfferich's Solution For Constant Porositymentioning

confidence: 99%

Streamline simulation of a reactive advective flow with discontinuous flux function

et al. 2018

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Reactive transport in porous media with dissolution and precipitation has important applications in oil and gas industry and groundwater remediation. In this work, we present a simulation method for reactive flow in porous media of two salts that share an ion. The method consists of a front-tracking solver that uses the Riemann solutions of the underlying set of hyperbolic partial differential equations. In addition to the discontinuities stemming from the nonlinearities of the flux function, the flux function for the corresponding advection reaction equation also admits discontinuities for a heterogeneous medium. Here, we solve the Riemann problem for the governing nonlinear hyperbolic system with a discontinuous flux function. We use mass balance across the interface and the non-decreasing sequence of velocity of waves to seek the unique solution for this problem. Furthermore, a model is provided for mixing of streamlines at the well to estimate the amount of precipitate. In the use of streamline methods, we have modified the definition of time-of-flight to allow the model to be easily utilised for the heteregeneous case. The simulation method is applied to model dissolution through injection of an unsaturated fluid. It is shown that the first dissolution shock, which causes induced precipitation due to the co-ion effect, results in accumulation of precipitate at the well.

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Mineral sequences in precipitation/dissolution waves

Cited by 40 publications

References 14 publications

The characteristic target-pattern regional ore zonality of the Nanling region, China (III)

The characteristic target-pattern regional ore zonality of the Nanling region, China (III)

Rule‐based mineral sequences in geochemical flow processes

Streamline simulation of a reactive advective flow with discontinuous flux function

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