Caracterización de la piedra monumental de la ciudad de Zamora (España)
- Mónica Añorbe Urmeneta
- Juan Antonio Díez Torres
- María Mercedes Suárez Barrios
- José Navarrete López-Cozar
- José María Martín Pozas
ISSN: 0210-6558
Année de publication: 1992
Volumen: 15
Número: 0
Pages: 19-29
Type: Article
D'autres publications dans: Boletín de la Sociedad Española de Mineralogía
Résumé
The Monumental Heritage of the town of Zamora (Spain) is fundamentally built of siliceous sandstones and conglomerates from de upper section of the Paleogene Lower Unit outcrops. Mineralogy, texture, structure, porosity and other physical properties of the rock of the stone quarries next to the town are studied in order to determine the internal characteristics which conditioned the damage processes. The elastics components are: mono and polycrystalline quarzt, rock fragments and, in a minor proportion, feldpars, micas and heavy and opaque minerals. The cement-matrix constitues more than 25% of the rock and it is siliceous formed by A and CT opal with clay minerals inbibed in it (kaolinite and accidentally smectites). Samples with yellow and/or red and mauve tintures show a cement of goethite and/or haematite overprinting anterior cement. Physical properties show a wide interval of values due to the fact that the original rock shows a great difference in the degree of cementation which causes an important porous system variability.