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Minerals 2018, 8(8), 326; https://doi.org/10.3390/min8080326

Hydrotalcite and Hydrocalumite in Mortar Binders from the Medieval Castle of Portilla (Álava, North Spain): Accurate Mineralogical Control to Achieve More Reliable Chronological Ages

1
Department of Mineralogy and Petrology, Science and Technology Faculty, University of the Basque Country-UPV/EHU, Sarriena s/n, 48940 Leioa, Bizkaia, Spain
2
Department of Geography, Prehistory and Archaeology, Faculty of Arts, University of the Basque Country-UPV/EHU, Paseo de la Universidad, 5, 01006 Vitoria-Gasteiz, Spain
*
Author to whom correspondence should be addressed.
Received: 8 June 2018 / Revised: 11 July 2018 / Accepted: 26 July 2018 / Published: 29 July 2018
(This article belongs to the Section Mineral Geochemistry and Geochronology)
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Abstract

Mortars from different stratigraphic units at Portilla Castle (Alava, North Spain) have been analyzed for mineralogical characterization before radiocarbon dating. The mortar binder at Portilla Castle is composed not only of neoformation calcite but also of double-layered hydroxide (LDH) minerals such as hydrotalcite and hydrocalumite. The mineralogy of several fractions of the binder has been analyzed to determine the granulometric distribution of minerals in the binder. The continuous monitoring of mineralogy during the extraction of different grain size fractions has been performed by using a scanning electron microscopy (SEM), X-ray diffraction (XRD), and thermogravimetric analyses (TGA). Hydrotalcite and hydrocalumite-bearing mortar binders give older ages than expected since they introduce dead carbon into the system. View Full-Text
Keywords: mortar; binder; hydrotalcite; hydrocalumite; radiocarbon dating mortar; binder; hydrotalcite; hydrocalumite; radiocarbon dating
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Ponce-Antón, G.; Ortega, L.A.; Zuluaga, M.C.; Alonso-Olazabal, A.; Solaun, J.L. Hydrotalcite and Hydrocalumite in Mortar Binders from the Medieval Castle of Portilla (Álava, North Spain): Accurate Mineralogical Control to Achieve More Reliable Chronological Ages. Minerals 2018, 8, 326.

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