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The Alteration Products of Potassium Depleted Oxybiotite

  • Published:
Clays and Clay Minerals

Abstract

Artificial weathering of biotites, which contain various levels of structural ferric iron, by NaCl 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 development 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.

Résumé

L’altération artificielle par des solutions Na Cl et Na B Ph4 de biotites de teneurs variées en fer ferrique de constitution, produit des minéraux et des structures semblables à ceux que l’on décrit pour les biotites altérées naturellement. L’oxydation du fer de constitution entraîne l’extraction de K à partir de feuillets alternés et le développement d une hydrobiotite. Le développement de l’ordre avec les teneurs en fer ferrique croissantes a été établi par comparaison avec les calculs théoriques concernant des structures interstratifiées au hasard ou d’une manière plus ordonnée. On apporte une preuve de l’existence de deux types de feuillets existant dans la biotite avant son oxydation. La diminution de la vitesse de libération de K due à l’oxydation a été confirmée.

Kurzreferat

Die künstliche Verwitterung von Biotiten, die unterschiedliche Gehalte an Gitter-Fe3+ aufweisen, mit NaCl- und Natriumtetraphenylborat-Lösung ergibt ähnliche Minerale und Strukturen, wie sie für natürlich verwitterte Biotite beschrieben worden sind. Die Oxidation von Gittereisen führt zur K-Freisetzung aus alternierenden Schichten und zur Bildung von Hydrobiotit.

Die Zunahme der Schichtordnung mit steigendem Fe3+-Gehalt wurde durch einen Vergleich mit theoretischen Berechnungen für zufällige und vollständig geordnete Wechsellagerungsstrukturen abgeschätzt. Es bestehen Hinweise auf das Vorliegen von zwei Schichttypen in Biotit vor Eintreten der Oxidation. Die Herabsetzung der Freisettungsrate von K als Folge der Oxidation wurde bestätigt.

Резюме

При исскуственном выветривании биотитов, содержащих различные уровни струк¬турного железа, посредством раствора NaCl и NaBPh4, получили минералы структур сходных со структурами естественно выветренных биотитов. Окисление структурного железа ведет к отщеплению К из перемежающихся слоев и к образованию гидробиотита. Количественно оценивался порядок роста при повышающемся содержании железа сравнением с теорети¬ческим анализом произвольного и самого упорядоченного перемежающегося напластования. Существуют экспериментальные данные, поддерживающие существование двух типов слоев в биотите до окисления. Было подтверждено понижение степени скорости выделения К благодаря окислению.

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Authors and Affiliations

  1. Department of Soil Science and Plant Nutrition, Institute of Agriculture, University of Western Australia, Nedlands, W.A., 6009, USA

    R. J. Gilkes

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Gilkes, R.J. The Alteration Products of Potassium Depleted Oxybiotite. Clays Clay Miner. 21, 303–313 (1973). https://doi.org/10.1346/CCMN.1973.0210506

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  • DOI: https://doi.org/10.1346/CCMN.1973.0210506

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