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Vermiculite expansion through non-artificial processes in pyroclastic carbonatites from Catanda (Angola)

Published online by Cambridge University Press:  02 January 2018

J. Xu ,
M. Campeny ,
E. Tauler ,
J.C. Melgarejo  and
A.O. Gonçalves
J. Xu*
Affiliation:
Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Geologia, Universitat de Barcelona, C/Martí i Franquès s/n, 08028 Barcelona, Spain
M. Campeny
Affiliation:
Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Geologia, Universitat de Barcelona, C/Martí i Franquès s/n, 08028 Barcelona, Spain
E. Tauler
Affiliation:
Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Geologia, Universitat de Barcelona, C/Martí i Franquès s/n, 08028 Barcelona, Spain
J.C. Melgarejo
Affiliation:
Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Geologia, Universitat de Barcelona, C/Martí i Franquès s/n, 08028 Barcelona, Spain
A.O. Gonçalves
Affiliation:
Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Geologia, Universitat de Barcelona, C/Martí i Franquès s/n, 08028 Barcelona, Spain
*
*E-mail: [email protected]
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Abstract

The pyroclastic carbonatitic rocks from the Catanda volcanic area (Angola) contain annite and phlogopite grains which have been affected to a significant extent by vermiculitization. A mineralogical study of these micas has revealed that the annite was altered to K-vermiculite while vermiculitization of phlogopite generated Ca-vermiculite. Intermediate alteration products such as intergrowths of phlogopite/Ca-vermiculite were also found, but interstratified crystals of phlogopite/ vermiculite, a common intermediate product during vermiculitization processes, are not reported in the Catanda rocks. The two types of vermiculitized micas show ‘accordion’ textures, related to the expansion of vermiculite. To the authors’ knowledge, the present study is the first report of expanded vermiculites described in natural rocks and not generated as a consequence of industrial processing.

Keywords

vermiculite expansionannitephlogopitecarbonatiteCatandaAngola
Type
Research Article
Information
Clay Minerals , Volume 51 , Issue 5 , December 2016 , pp. 747 - 762
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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