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Hydrolysis of ceramic materials: neoformation or rehydroxylation of clay minerals. Oxygen stable isotope analysis

Published online by Cambridge University Press:  09 July 2018

R. Nuñez ,
J . Capel ,
E. Reyes  and
A. Delgado
R. Nuñez*
Affiliation:
Departamento de Ciencias de la Tierra y Química Ambiental, Estación Experimental del Zaidin CSIC, Prof. Albareda 1, 18008 Granada
J . Capel
Affiliation:
Departamento de Prehistoria y Arqueología, Universidad de Granada, Spain
E. Reyes
Affiliation:
Departamento de Ciencias de la Tierra y Química Ambiental, Estación Experimental del Zaidin CSIC, Prof. Albareda 1, 18008 Granada
A. Delgado
Affiliation:
Departamento de Ciencias de la Tierra y Química Ambiental, Estación Experimental del Zaidin CSIC, Prof. Albareda 1, 18008 Granada
*
*E-mail: [email protected]
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Abstract

Hand-made bricks were manufactured from natural sediments by firing at 700°C and 800°C after which they were hydrothermally altered at 150°C in a high-pressure reactor for 1200 h. Sediments and fired pieces were studied by X-ray diffraction. The <2 μm size-fraction of fired and hydrolysed samples were also studied by X-ray diffraction and oxygen isotope analysis. The oxygen isotope composition of the samples became depleted in 18O by alteration. Our results are consistent with a process of hydration and hydroxylation of the partially destroyed clay minerals in the fired bricks. The work is relevant to understanding the origins and alteration processes in old ceramic materials.

Keywords

rehydroxylationstable isotopesoxygenclay minerals
Type
Research Article
Information
Clay Minerals , Volume 37 , Issue 2 , June 2002 , pp. 345 - 349
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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