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

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 vermiculitizatio...

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Veröffentlicht in:	Clay minerals 2016-12, Vol.51 (5), p.747-762
Hauptverfasser:	Xu Jingyao, Xu Jingyao, Campeny, M, Tauler, E, Melgarejo, J. C, Gonçalves, A. O
Format:	Artikel
Sprache:	eng
Schlagworte:	Africa alteration Alterations Angola annite carbonatite carbonatites Catanda Catanda Angola Central Africa clay mineralogy Clay minerals crystal growth crystallization Crystals igneous rocks intergrowths Mica mica group Mineralogy phlogopite pyroclastics Rocks sed rocks, sediments Sedimentary petrology sheet silicates silicates Surface layer Texture Vermiculite vermiculite expansion vermiculitization volcanic rocks
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