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Halloysite in Argentinian deposits: origin and textural constraints

Published online by Cambridge University Press:  09 July 2018

F. Cravero ,
P. J. Maiza  and
S. A. Marfil
F. Cravero*
Affiliation:
Department of Geology, INGEOSUR. Universidad Nacional del Sur. San Juan 670. 8000 Bahía Blanca, Argentina CONICET, Argentina
P. J. Maiza
Affiliation:
Department of Geology, INGEOSUR. Universidad Nacional del Sur. San Juan 670. 8000 Bahía Blanca, Argentina CONICET, Argentina
S. A. Marfil
Affiliation:
Department of Geology, INGEOSUR. Universidad Nacional del Sur. San Juan 670. 8000 Bahía Blanca, Argentina CIC of the Province of Buenos Aires, Argentina
*
*E-mail: [email protected]
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Abstract

In Argentina, the only halloysite deposits found so far are located in the southwest of the province of Rio Negro. The areas are named Mamil Choique and Buitrera, separated by 50 km in a W–E direction. The deposits are located in pyroclastic rocks, rhyolitic tuffs and ignimbrites.

The aim of this paper is to determine the origin of the alteration, any relationship between the processes in Mamil Choique and Buitrera, and the factors which controlled the halloysite formation. The work was based on field work, mineralogical and geochemical studies, form and distribution of the alteration. Fresh as well as altered rocks were collected. The first were studied by petrographic and chemical methods. In altered samples, the clay mineralogy was determined by XRD and textures by SEM and TEM. Chemical analyses on fresh and altered samples were used to characterize the alteration process and the rock composition.

It was concluded that halloysite has been formed by weathering in a time range from Middle Eocene to Middle Oligocene and extended along 50 km in a W-E direction, independent of the source rock. Particle morphology depends on the original texture of the rock. Spheroidal halloysite is related to rocks with low porosity and tubular particles are related to rocks with open spaces.

Keywords

halloysitekaolinPatagoniaArgentina
Type
Research Papers
Information
Clay Minerals , Volume 47 , Issue 3 , September 2012 , pp. 329 - 340
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2012

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