Single-crystal plagioclase feldspar dissolution rates measured by vertical scanning interferometry

Arvidson, Rolf S.; Beig, Mikala S.; Lüttge, Andreas

doi:10.2138/am-2004-0107

Cited by 51 publications

(45 citation statements)

References 22 publications

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“…Therefore, it seems to be likely that the reaction kinetics is influenced by the crystallographic direction when considering the atomic sites present on different crystal surfaces. For instance, Arvidson et al (2004) found that dissolution rates developed on the (010) cleavage face of albite are faster than those on the (001) cleavage face. They suggest that this may be a consequence of an anisotropic distribution of Al-O-Si and Si-O-Si bonds in the feldspar structure.…”

Section: Discussionmentioning

confidence: 99%

The replacement of plagioclase feldspars by albite: observations from hydrothermal experiments

Hövelmann

Putnis

Geisler

et al. 2009

Contrib Mineral Petrol

180

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Oligoclase and labradorite crystals have been experimentally replaced by albite in an aqueous sodium silicate solution at 600°C and 2 kbars. The replacement is pseudomorphic and is characterised by a sharp chemical interface which progresses through the feldspar while preserving the crystallographic orientation. Reaction rims of albite, up to 50 lm thick, can be readily achieved within 14 days. Re-equilibration of plagioclase in an 18 O-enriched sodium-and silica-bearing solution results in oxygen isotope redistribution within the feldspar framework structure. The observed characteristics of the reaction products are similar to naturally albitised plagioclase and are indicative of an interface-coupled dissolution-reprecipitation mechanism. Chemical analyses demonstrate that the albitisation is accompanied by the mobilisation of major, minor and trace elements also including elements such as Al and Ti which are commonly regarded as immobile during hydrothermal alteration. The results contribute to developing our understanding of the close association between large-scale albitisation and secondary ore mineralisation which is common in nature.

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Section: Discussionmentioning

confidence: 99%

The replacement of plagioclase feldspars by albite: observations from hydrothermal experiments

Hövelmann

Putnis

Geisler

et al. 2009

Contrib Mineral Petrol

180

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“…For example, saw-tooth like replacement fronts have been observed in feldspar replacements (e.g., Niedermeier et al 2009;Norberg et al 2011), which has been suggested to be related to the weakness of the Al-O-Si bond relative to Si-O-Si bond within the tetrahedral framework of alkali feldspar (Arvidson et al 2004;Schott and Oelkers 1995;Schott et al 2009;Xiao and Lasaga 1994). Similarly, a number of investigations have illustrated the anisotropic dissolution of olivine, which is an important process in the fracture generation associated with serpentinization (King et al 2010Peuble et al 2015).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Textural and compositional complexities resulting from coupled dissolution–reprecipitation reactions in geomaterials

Altree-Williams

Pring

Ngothai

et al. 2015

Earth-Science Reviews

130

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“…These observations can be explained in light of the dissolution stepwave model, which describes the role of etch pits in terms of their ability to generate a continual sequence of steps [32][33][34]. The peripheries of etch pits contain a number of steps that migrate into the rest of the mineral surface during dissolution.…”

Section: The Dissolution Stepwave Modelmentioning

confidence: 99%

An integrated study of uranyl mineral dissolution processes: etch pit formation, effects of cations in solution, and secondary precipitation

Schindler¹,

Hawthorne

Mandaliev

et al. 2011

Radiochimica Acta

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Summary.Understanding the mechanism(s) of uraniummineral dissolution is crucial for predictive modeling of U mobility in the subsurface. In order to understand how pH and type of cation in solution may affect dissolution, experiments were performed on mainly single crystals of curite, PbSolutions included: deionized water; aqueous HCl solutions at pH 3.5 and 2; 0.5 mol L −1 Pb(II)-, Ba-, Sr-, Ca-, Mg-, HCl solutions at pH 2; 1.0 mol L −1 Na-and K-HCl solutions at pH 2; and a 0.1 mol L −1 Na 2 CO 3 solution at pH 10.5. Uranyl mineral basal surface microtopography, micromorphology, and composition were examined prior to, and after dissolution experiments on micrometer scale specimens using atomic force microscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy. Evolution of etch pit depth at different pH values and experimental durations can be explained using a stepwave dissolution model. Effects of the cation in solution on etch pit symmetry and morphology can be explained using an adsorption model involving specific surface sites. Surface precipitation of the following phases was observed: (a) a highly-hydrated uranyl-hydroxy-hydrate in ultrapure water (on all minerals), (b) a Na-uranyl-hydroxy-hydrate in Na 2 CO 3 solution of pH 10.5 (on uranyl-hydroxy-hydrate minerals), (c) a Na-uranyl-carbonate on zippeite, (d) Ba-and Pb-uranylhydroxy-hydrates in Ba-HCl and Pb-HCl solutions of pH 2 (on uranophane), (e) a (SiO x (OH) 4−2x ) phase in solutions of pH 2 (uranophane), and (f) sulfate-bearing phases in solutions of pH 2 and 3.5 (on zippeite).

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Single-crystal plagioclase feldspar dissolution rates measured by vertical scanning interferometry

Cited by 51 publications

References 22 publications

The replacement of plagioclase feldspars by albite: observations from hydrothermal experiments

The replacement of plagioclase feldspars by albite: observations from hydrothermal experiments

Textural and compositional complexities resulting from coupled dissolution–reprecipitation reactions in geomaterials

An integrated study of uranyl mineral dissolution processes: etch pit formation, effects of cations in solution, and secondary precipitation

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