The Experimental Study of Bimetasomatic Skarn Formation

Zarayskiy, G. P.; Zharikov, V. A.; Stoyanovskaya, F. M.; Balashov, Victor N.

doi:10.1080/00206818709466181

Cited by 6 publications

(9 citation statements)

References 50 publications

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“…As the composition of the primary mineral (orthopyroxene) does not have a strong influence on the coronas, and they are formed not only at the exact contact between orthopyroxene and plagioclase crystals, but surrounded the whole orthopyroxene grains, it is concluded that the experimental coronas have precipitated from the fluid phase. Therefore, other experiments were made on the method of metasomatic experiments (with mineral powder reactants; Zaraisky et al, 1986), and also with the addition of NaCl to the fluid phase to prevent the movement of Na to the fluid phase.…”

Section: Experiments 1 (With H 2 O Fluid)mentioning

confidence: 99%

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Experimental modelling of corona textures

Larikova¹,

Zaraisky

2009

Journal Metamorphic Geology

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Formation of corona textures along olivine-plagioclase and orthopyroxene-plagioclase interfaces has been experimentally reproduced at 670 and 700°C and 5 kbar with either a pure H 2 O fluid phase or 0.1 and 37 M M NaCl-H 2 O solution fluid. In these experiments, we investigate the interaction of primary olivine and ⁄ or orthopyroxene and plagioclase in powders and polished crystals, and in small samples of a natural gabbro. The experiments result in the formation of corona textures with several layers of different assemblages (according to the experimental conditions) consisting of garnet (grossular), clinopyroxene, orthopyroxene, amphibole, chlorite and phlogopite. The experiments show major differences in the number of layers, the mineral assemblages and mineral composition, and in the trends of composition of plagioclase in coronas around olivine and orthopyroxene. The fluid phase composition influences the corona assemblages and the composition of the minerals in the experimental coronas; for example, garnet appears in the coronas in the second experiment where the NaCl-H 2 O ratio is low. Experimental modelling of corona textures confirms a model of simultaneous growth of layers by the mechanism of diffusion metasomatism with participation of a fluid phase through which mass is transferred. Zoning in the experimental coronas shows opposing diffusion of Al and Ca from plagioclase and Mg and Fe from olivine ⁄ orthopyroxene; difference in the mobility of the components is inferred from observations in the coronas. The experimental corona textures are compared with natural coronas from the Belomorian belt (Baltic shield), developed at 670-690°C and 7-8 kbar, and the Marun-Keu complex (Polar Urals), developed at 670-700°C and 14-16 kbar, where the corona textures correspond to a transitional stage of the gabbro-to-eclogite transformation.

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Section: Experiments 1 (With H 2 O Fluid)mentioning

confidence: 99%

“…The starting mineral compositions were close to those in natural metagabbros, and each run lasted two weeks. Experiments were carried out according to the technique of bimetasomatic experiments with contact interaction of two contrasting mediums (Zaraisky et al. , 1986) in two gold capsules (Fig.…”

Section: Experimental Technique and Analytical Proceduresmentioning

confidence: 99%

Experimental modelling of corona textures

Larikova¹,

Zaraisky

2009

Journal Metamorphic Geology

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“…This reactive process happens because of the contrast in the sandstone and shale mineralogies, and especially because of the relatively high abundances of oligoclase and smectite in sandstone, and the relatively high chlorite content (> 5 %) in the shale. Porosity closure has often been noted at the interface of two rocks with mineralogical contrast during bimetasomatism (Zaraisky et al, 1986(Zaraisky et al, , 1989 and has been investigated previously (Balashov et al, 1991;Lichtner et al, 1998;Steefel and Lichtner, 1994).…”

Section: Reactive Zone In Shalementioning

confidence: 91%

Predictive Modeling of CO<sub>2</sub> Sequestration and Storage in Deep Saline Sandstone Reservoirs: Sensitivity Analysis of Mineral Rates in Reactive Transport

Balashov

Brantley

Guthrie

et al. 2017

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“…Specifically, oligoclase and smectite provide the Ca and Mg, and chlorite provides the Fe and Mg that drive precipitation of the calcite, dolomite and ankerite. Others have investigated porosity closure at the interface of rocks of differing mineralogy undergoing metasomatism (Balashov and Lebedeva, 1991;Zaraisky et al, 1989;Zarayskiy et al, 1987). Such porosity clogging is important, for example, where hyper-alkaline solutions or cement-based materials are in contact with clay-containing rocks Lichtner, 1994, 1998).…”

Section: Reactive Zone In Shalementioning

confidence: 94%

Reaction and diffusion at the reservoir/shale interface during CO2 storage: Impact of geochemical kinetics

Balashov

Guthrie

Lopano

et al. 2015

Applied Geochemistry

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Editorial handling by M. Kersten a b s t r a c tWe use a reactive diffusion model to investigate what happens to CO 2 injected into a subsurface sandstone reservoir capped by a chlorite-and illite-containing shale seal. The calculations simulate reaction and transport of supercritical (SC) CO 2 at 348.15 K and 30 MPa up to 20,000 a. Given the low shale porosity (5%), chemical reactions mostly occurred in the sandstone for the first 2000 a with some precipitation at the ss/sh interface. From 2000 to 4000 a, ankerite, dolomite and illite began replacing Mg-Fe chlorite at the sandstone/shale interface. Transformation of chlorite to ankerite is the dominant reaction occluding the shale porosity in most simulations: from 4000 to 7500 a, this carbonation seals the reservoir and terminates reaction. Overall, the carbonates (calcite, ankerite, dolomite), chlorite and goethite all remain close to local chemical equilibrium with brine. Quartz is almost inert from the point of its dissolution/-precipitation. However, the rate of quartz reaction controls the long-term decline in aqueous silica activity and its evolution toward equilibrium. The reactions of feldspars and clays depend strongly on their reaction rate constants (microcline is closer to local equilibrium than albite). The timing of porosity occlusion mostly therefore depends on the kinetic constants of kaolinite and illite. For example, an increase in the kaolinite kinetic constant by 0.25 logarithmic units hastened porosity closure by 4300 a. The earliest simulated closure of porosity occurred at approximately 108 a for simulations designed as sensitivity tests for the rate constants.These simulations also emphasize that the rate of CO 2 immobilization as aqueous bicarbonate (solubility trapping) or as carbonate minerals (mineral trapping) in sandstone reservoirs depends upon reaction kinetics -but the relative fraction of each trapped CO 2 species only depends upon the initial chemical composition of the host sandstone. For example, at the point of porosity occlusion the fraction of bicarbonate remaining in solution depends upon the initial Na and K content in the host rock but the fraction of carbonate mineralization depends only on the Ca, Mg, Fe content. Since ankerite is the dominant mineral that occludes porosity, the dissolved concentration of ferrous iron is also an important parameter. Future efforts should focus on cross-comparisons and ground-truthing of simulations made for standard case studies as well as laboratory measurements of the reactivities of clay minerals.

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The Experimental Study of Bimetasomatic Skarn Formation

Cited by 6 publications

References 50 publications

Experimental modelling of corona textures

Experimental modelling of corona textures

Predictive Modeling of CO<sub>2</sub> Sequestration and Storage in Deep Saline Sandstone Reservoirs: Sensitivity Analysis of Mineral Rates in Reactive Transport

Reaction and diffusion at the reservoir/shale interface during CO2 storage: Impact of geochemical kinetics

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