Journal ArticleDOI
The Alteration Products of Potassium Depleted Oxybiotite
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TLDR
In this paper, the growth of order with increasing ferric iron content has been assessed by comparison with theoretical calculations for random and most ordered interstratified structures, and the depression in rates of K release due to oxidation has been confirmed.Abstract:
Artificial weathering of biotites, which contain various levels of structural ferric iron, by NaCI and NaBPh4 solutions produces minerals and structures similar to those described for naturally weathered biotites. Oxidation of structural iron leads to K removal from alternate layers and develop- ment of hydrobiotite. The growth of order with increasing ferric iron content has been assessed by comparison with theoretical calculations for random and most ordered interstratified structures. There is evidence for the existence of two layer types in biotite prior to oxidation. The depression in rates of K release due to oxidation has been confirmed.read more
Citations
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Journal ArticleDOI
Weathering of the primary rock-forming minerals: processes, products and rates
TL;DR: In this article, the authors describe the ways in which the major rock-forming primary minerals (olivine, pyroxenes, amphiboles, feldspars, micas and chlorites) break down during weathering, the products that develop during this breakdown and the rates at which this breakdown occurs.
Journal ArticleDOI
Kinetics of muscovite, phlogopite, and biotite dissolution and alteration at pH 1-4, room temperature
TL;DR: In this article, the reaction kinetics of dioctahedral muscovite and trio-chedral phlogopite and biotite were studied in aqueous solutions at pH 1-4 and room temperature.
Journal ArticleDOI
Nature of mixed-layer clays and mechanisms of their formation and alteration
TL;DR: In this article, mixed-layer clays are intermediate products of reactions involving pure end-member clays and they come from natural environments ranging from surface to low-grade metamorphic and hydrothermal conditions Most often mixed layering is essentially two component.
Journal ArticleDOI
Biotite alteration in deeply weathered granite; I, Morphological, mineralogical, and chemical properties
Robert Gilkes,A. Suddhiprakarn +1 more
TL;DR: Biotite in deeply weathered granitic rocks in southwestern Australia has altered to exfoliated grains composed of biotite, mixed-layer clay minerals, kaolinite, vermiculite, gibbsite, goethite, and hematite as discussed by the authors.
Journal ArticleDOI
Morphological and Chemical Features of Bioweathered Granitic Biotite Induced by Lichen Activity
Jacek Wierzchos,Carmen Ascaso +1 more
TL;DR: In this paper, the physico-chemical activity of lichens on micaceous components of granitic rocks was studied using a Back Scattered Electron (BSE) detector and an Energy Dispersive Spectroscopy (EDS) system.
References
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Journal Article
Mineralogical Society (London)
TL;DR: In this article, a number of lime-rich plagioclases have been subjected to varying heat treatments and the effects of these heat treatments have been studied by *-ray single crystal methods.
Book ChapterDOI
Interstratified Clay Minerals
D. M. C. MacEwan,A. Ruiz-Amil +1 more
TL;DR: In this article, it was verified that this irregularity was due to the interstratification of different types of crystalline layers, which is a phenomenon that was first observed on studying clay minerals by X-ray diffraction.
Journal ArticleDOI
Evidence for loss of protons and octahedral iron from oxidized biotites and vermiculites
TL;DR: In this article, an analysis of a weathered biotite and of biotites converted to vermiculites and subsequently oxidized, showed that oxidation of octahedral ferrous ions to ferric ions is associated with reversible conversion of hydroxyl ions to oxide ions, resulting in an increased number of dioctahedral sites.
Related Papers (5)
Evidence for loss of protons and octahedral iron from oxidized biotites and vermiculites
Biotite alteration in deeply weathered granite; I, Morphological, mineralogical, and chemical properties
Robert Gilkes,A. Suddhiprakarn +1 more