Relevant bibliographies by topics / Disequilibrium crystallization

Academic literature on the topic 'Disequilibrium crystallization'

Author: Grafiati
Published: 24 April 2022

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Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Journal articles on the topic "Disequilibrium crystallization":

1

Wu, Ya-Fei, Katy Evans, Si-Yu Hu, Denis Fougerouse, Mei-Fu Zhou, Louise A. Fisher, Paul Guagliardo, and Jian-Wei Li. "Decoupling of Au and As during rapid pyrite crystallization." Geology 49, no. 7 (March 26, 2021): 827–31. http://dx.doi.org/10.1130/g48443.1.

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Abstract Gold (Au) is largely hosted by pyrite in a variety of hydrothermal systems, but the incorporation of Au into pyrite under disequilibrium conditions remains poorly understood. We integrate synchrotron X-ray fluorescence microscopy, electron backscatter diffraction, nanoscale secondary ion mass spectrometry, and laser ablation–multicollector–inductively coupled plasma–mass spectrometry to constrain the processes that sequester Au into zoned pyrite in the hydrothermal cement of breccia ores from the world-class Daqiao orogenic Au deposit, central China. Euhedral pyrite cores with oscillatory and sector zoning, variable δ34S values, and lower Au-As contents than the mantles are attributed to crystallization during oxidation of metal-depleted ore fluids with local variation in fluid conditions. The isotopically uniform colloform mantles are formed by pyrite crystallites separated by low-angle boundaries and are characterized by unusual decoupling of Au and As. Mantle formation is attributed to rapid disequilibrium precipitation from a metal-rich FeS2-supersaturated fluid. Incorporation of Au into the pyrite mantles was facilitated by abundant lattice defects produced by rapid nucleation. Gold-As–poor pyrite rims were deposited from an evolved ore fluid or other metal-depleted fluids. These results show that chemical variations recorded by fine layering within minerals can provide valuable insights into disequilibrium mass transfer and ore formation. The decoupling between Au and As in pyrite mantles indicates that As is not always a reliable proxy for Au enrichment in rapidly crystallized porous pyrite.
2

Barbee, Olivia, Craig Chesner, and Chad Deering. "Quartz crystals in Toba rhyolites show textures symptomatic of rapid crystallization." American Mineralogist 105, no. 2 (February 1, 2020): 194–226. http://dx.doi.org/10.2138/am-2020-6947.

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Abstract Textural and chemical heterogeneities in igneous quartz crystals preserve unique records of silicic magma evolution, yet their origins and applications are controversial. To improve our understanding of quartz textures and their formation, we examine those in crystal-laden rhyolites produced by the 74 ka Toba supereruption (>2800 km3) and its post-caldera extrusions. Quartz crystals in these deposits can reach unusually large sizes (10–20 mm) and are rife with imperfections and disequilibrium features, including embayments, melt inclusions, titanomagnetite and apatite inclusions, spongy morphologies, hollow faces, subgrain boundaries, multiple growth centers, and Ti-enriched arborescent zoning. Using a combination of qualitative and quantitative analyses (petrography, CL, EBSD, X-ray CT, LA-ICPMS), we determine that those textures commonly thought to signify crystal resorption, crystal deformation, synneusis, or fluctuating P–T conditions are here a consequence of rapid disequilibrium crystal growth. Most importantly, we discover that an overarching process of disequilibrium crystallization is manifested among these crystal features. We propose a model whereby early skeletal to dendritic quartz growth creates a causal sequence of textures derived from lattice mistakes that then proliferate during subsequent stages of slower polyhedral growth. In a reversed sequence, the same structural instabilities and defects form when slow polyhedral growth transitions late to fast skeletal-dendritic growth. Such morphological transitions result in texture interdependencies that become recorded in the textural-chemical stratigraphy of quartz, which may be unique to each crystal. Similar findings in petrologic experimental studies allow us to trace the textural network back to strong degrees of undercooling and supersaturation in the host melt, conditions likely introduced by dynamic magmatic processes acting on short geologic timescales. Because the textural network can manifest in single crystals, the overall morphology and chemistry of erupted quartz can reflect not only its last but its earliest growth behavior in the melt. Thus, our findings imply that thermodynamic disequilibrium crystallization can account for primary textural and chemical heterogeneities preserved in igneous quartz and may impact the application of quartz as a petrologic tool.
3

Rigault, Cécile, Patricia Patrier, and Daniel Beaufort. "Clay minerals related to circulation of near neutral to weakly acidic fluids in active high energy geothermal systems." Bulletin de la Société Géologique de France 181, no. 4 (July 1, 2010): 337–47. http://dx.doi.org/10.2113/gssgfbull.181.4.337.

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Abstract Clay minerals are widespread alteration products in most hydrothermal systems and are considered as efficient petrogenetic guides. Their distribution in active geothermal fields depends on the ability of the fluid to approach equilibrium with host rocks at any scale during the hydrothermal processes. Both illitization and chloritization reactions depend on factors such as time, water-rock ratio, deformation history... as well as the variables used to define equilibrium (i.e., temperature, composition). This paper is focussed on how the properties of clay minerals change with respect to the evolution of hydrogeological conditions during the life time of geothermal systems. The presented data are based on comparative studies performed in productive and non productive zones of several active geothermal systems related to subduction plate tectonics (Chipilapa, Milos and Bouillante). The temporal sequence of clay crystallizations can be summarized as follows. The opening stage of the geothermal system promotes a massive crystallization of metastable smectites in conditions of strong thermodynamic disequilibrium. As time and alteration progress, clay minerals of the newly sealed parts of the reservoir are transformed in more stable phases (via dissolution crystallization processes). Metastable smectites continue to precipitate in the permeable zones still subjected to strong physico-chemical disequilibrium such as boiling or mixing of fluids of contrasted composition and/or temperature, whereas clay minerals close to those predicted by thermodynamic calculations (illite, chlorite) crystallize in other zones in which the geothermal fluid can reach chemical equilibrium with the altered host rock. Downward infiltration of surficial water led to crystallization of montmorillonite in the outer part of geothermal fields. Collapsing of hydrothermal activity leads to a change in the heat flow regime with predominance of a depth dependant conductive thermal gradient. Even if such thermal conditions promote the transformation of the previously formed smectite rich metastable clay minerals and lead to a progressive emplacement of depth dependant conversion series of di- and trioctahedral smectites to respectively illite and chlorite, signatures of the ancient geothermal reservoirs are preserved in the textural or microstructural properties of the clay particles which sealed them.
4

Van Lichtervelde, Marieke, Francois Holtz, and Frank Melcher. "The effect of disequilibrium crystallization on Nb-Ta fractionation in pegmatites: Constraints from crystallization experiments of tantalite-tapiolite." American Mineralogist 103, no. 9 (September 1, 2018): 1401–16. http://dx.doi.org/10.2138/am-2018-6441.

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5

Zimmermann, Rolf, Erich Knop, Wilhelm Heinricrf, Inge Pehlke, and Gerhard Franz. "Disequilibrium in cation exchange experiments between Na-K-Ca amphiboles and aqueous Na-K-Ca chloride solutions: effects of fractional crystallization." European Journal of Mineralogy 9, no. 1 (December 30, 1996): 97–114. http://dx.doi.org/10.1127/ejm/9/1/0097.

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6

Duggan, M. B. "Zirconium-rich Sodic Pyroxenes in Felsic Volcanics from the Warrumbungle Volcano, Central New South Wales, Australia." Mineralogical Magazine 52, no. 367 (September 1988): 491–96. http://dx.doi.org/10.1180/minmag.1988.052.367.07.

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AbstractSoda-rich pyroxenes in felsic rocks from the Warrumbungle Volcano, central New South Wales, contain up to 14.5 wt. % ZrO2, which is more than double the previously reported maximum ZrO2 in pyroxene. Zr is believed to enter aegirine as the component Na(Fe2+,Mn,Mg)0.5Zr0.5Si2O6 via the coupled substitution: (Fe2+,Mn,Mg)VI+ZrVI = 2(Fe3+)VI. This component exceeds 50 mol. % in some analyses.Pronounced pyroxene Zr-enrichment is restricted to rocks in which sodic amphibole is the major ferromagnesian mineral, with pyroxene only a minor late-stage phase. The Zr-rich pyroxenes resulted from a combination of host lava peralkalinity, low oxygen fugacity, rapid disequilibrium crystallization and low mobility of the Zr ion. These factors collectively led to the development of interstitial Zr-enriched microdomains in the felsic hosts during their final stages of crystallization.
7

Bagiński, B., P. Dzierżanowski, R. Macdonald, and B. G. J. Upton. "Complex relationships among coexisting pyroxenes: the Palaeogene Eskdalemuir dyke, Scotland." Mineralogical Magazine 73, no. 6 (December 2009): 929–42. http://dx.doi.org/10.1180/minmag.2009.073.6.929.

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AbstractThe composite Eskdalemuir dyke was formed by the intrusion of rhyolitic magma into partly crystallized basaltic magma, the proportion of the silicic component increasing towards the dyke centre. The less silicic parts were effectively supercooled and crystallization was halted when the residual melt quenched to rhyolitic glass which constitutes up to 50% of the dyke's centre. Pyroxene compositions in the mixed magma rocks include augite, pigeonite and orthopyroxene of very variable composition. Individual crystals in the matrix as small as 200 μm can contain compositions occupying a considerable part of the Di-Hd-En-Fs quadrilateral. Pyroxene crystallization took place under extreme disequilibrium conditions, as shown by highly variable zonation patterns; apparently opposite zoning trends can occur in adjacent grains. Small-scale variations in melt composition were probably the dominant control over the compositional and textural complexity in the pyroxenes.
8

Stepanov, Aleksandr S. "The tales of disequilibrium and equilibrium crystallization of rare metal minerals: Data from new experiments." American Mineralogist 103, no. 9 (September 1, 2018): 1353. http://dx.doi.org/10.2138/am-2018-6671.

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9

Koptev-Dvornikov, E. V., and D. M. Khvorov. "Estimation of crystallization proportions and the equilibrium/disequilibrium of quench experiments in the basite systems." Geochemistry International 49, no. 1 (January 2011): 13–30. http://dx.doi.org/10.1134/s0016702911010046.

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10

Fabbrizio, Alessandro, Max W. Schmidt, Detlef Günther, and Jost Eikenberg. "Experimental determination of radium partitioning between leucite and phonolite melt and 226Ra-disequilibrium crystallization ages of leucite." Chemical Geology 255, no. 3-4 (October 2008): 377–87. http://dx.doi.org/10.1016/j.chemgeo.2008.07.008.

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You might also be interested in the extended bibliographies on the topic 'Disequilibrium crystallization' for particular source types:
Journal articles

Dissertations / Theses on the topic "Disequilibrium crystallization":

1

Kelly, Eric David. "Unrecognized complexities of metamorphism : crystallization kinetics, reaction affinity, and geochronology." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-12-4781.

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Unrecognized metamorphic complexities can produce erroneous interpretations when using equilibrium thermodynamics and isotope geochronology. Universally employed methods for determining pressure-temperature conditions during regional metamorphism are based on the assumption of chemical equilibrium, and geochronology in metamorphic rocks can suffer from cryptic redistribution of isotopes. In this research, the scales of disequilibrium in regionally metamorphosed rocks and the effects of garnet resorption on Lu-Hf garnet ages were examined through numerical simulations of these processes. Concerning scales of disequilibrium, thirteen porphyroblastic datasets, previously measured using X-ray computed tomography, were examined by numerically simulating diffusion-controlled nucleation and growth of garnet while tracking chemical potential gradients to determine reaction affinity Ar (-[Delta]rG). Maximum nucleation rates are 10⁻¹³̇⁶-10⁻⁹̇⁸ nuclei cm⁻³ s⁻¹, interfacial energies are 0.004-0.14 J m⁻² assuming shape factors of 0.1-1.0, and Al intergranular diffusion (QD = 140 kJ/mol⁻¹) is 10⁻¹⁴̇⁴-10⁻¹¹̇¹ m² s⁻¹ at 600 °C. Limitations in determining crystallization kinetics arise from difficulties in constraining rock-specific properties (e.g., porosity and Al solubility). Ar at the time and location of nucleation is 0.4-5.9 kJ/mol⁻¹ of 12-oxygen garnet ([Delta]T = 4.0-62.0 °C) for the earliest nuclei, and 5.3-29.0 kJ/mol⁻¹ ([Delta]T = 50-125 °C) for nucleation at maximum Ar. The results demonstrate potential for delayed nucleation and metastability that can generate spurious interpretations. The timing of metamorphic events is also critical for understanding geologic history. In the Makhavinekh Lake Pluton aureole, Labrador, garnet resorption caused redistribution of Lu and loss of Hf from consumed rims, creating spuriously young ages. Garnet-ilmenite Lu-Hf geochronology using bulk separates yields apparent ages that young toward the contact from 1876 ± 21 Ma (4025 m) to 1396 ± 8 Ma (450 m). Toward the contact, garnet crystals are progressively more resorbed. Numerical modeling was used to test retention of Lu and loss of Hf during resorption as the dominant control on age. More resorption and Lu retention produce younger apparent ages (false ages). Application of the model to the aureole yields model ages from 1850 Ma to 1374 Ma, younging toward the contact. Thus, Lu-Hf geochronology applied to resorbed garnets requires careful examination of Lu zoning.
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Conference papers on the topic "Disequilibrium crystallization":

1

Sirbescu, Mona-Liza, and Niels Hulsbosch. "Inclusion Trapping during Disequilibrium Pegmatite Crystallization: Lessons from Tourmaline-Quartz Intergrowths." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2403.

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