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Coexistence of halloysite and iron-bearing clays in an altered ignimbrite, Patagonia, Argentina

Published online by Cambridge University Press:  27 February 2018

F. Cravero ,
S. A. Marfil ,
C. P. Ramos  and
P. Maiza
F. Cravero*
Affiliation:
Instituto de Geocronología y Geología Isotópica, CONICET-UBA, Pabellón INGEIS, Ciudad Universitaria, CABA, Argentina CONICET, Av.Rivadavia 1917, Buenos Aires, Argentina
S. A. Marfil
Affiliation:
Department of Geology, Universidad Nacional del Sur, San Juan 670, Bahía Blanca, Argentina CIC of the Province of Buenos Aires, Street N° 526 between 10 and 11, La Plata, Argentina
C. P. Ramos
Affiliation:
Departamento de Física de la Materia Condensada, GIyA–CAC–CNEA, Av.Gral. Paz 1499 (1650), San Martín, Buenos Aires, Argentina
P. Maiza
Affiliation:
Department of Geology, Universidad Nacional del Sur, San Juan 670, Bahía Blanca, Argentina
*
*E-mail: fcravero@uns.edu.ar
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Abstract

The Mamil Choique halloysite deposits of Patagonia, Argentina, contain randomly distributed green clay inclusions and patches within the halloysite mass. Halloysite has been formed from the thorough alteration of rhyolitic to dacitic ash fall tuffs and ignimbrites of the Huitrera Formation, Eocene age, under ambient conditions. The smectites present in the clay inclusions have been determined as ferruginous beidellites with variables amounts of Fe3+ in octahedral sites. The weathering activity that caused the formation of halloysite was also responsible for the genesis of the iron-bearing clay minerals, the formation of which was controlled mainly by permeability. Textural variations within the rock indicate favourable local geochemical environments for the formation of the green clay minerals.

Keywords

iron-bearing smectiteshalloysiteweatheringPatagoniaArgentina
Type
Research Article
Information
Clay Minerals , Volume 49 , Issue 3 , June 2014 , pp. 429 - 441
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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