Micro-Raman spectroscopy of rock paintings from the Galb Budarga and Tuama Budarga rock shelters, Western Sahara

Iriarte, Mercedes, Hernanz, Antonio, Gavira-Vallejo, José María, Sáenz de Buruaga, Andoni y Martín, Santiago . (2018) Micro-Raman spectroscopy of rock paintings from the Galb Budarga and Tuama Budarga rock shelters, Western Sahara. Microchemical Journal Volume 137, March 2018, Pages 250-257

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Título Micro-Raman spectroscopy of rock paintings from the Galb Budarga and Tuama Budarga rock shelters, Western Sahara
Autor(es) Iriarte, Mercedes
Hernanz, Antonio
Gavira-Vallejo, José María
Sáenz de Buruaga, Andoni
Martín, Santiago
Materia(s) Física
Abstract Rock paintings of two recent discovered rock shelters, Galb Budarga and Tuama Budarga, from the southeastern area of the Western Sahara, Sahrawi Arab Democratic Republic, have been studied by micro-Raman spectroscopy and scanning electron microscopy coupled with energy dispersive X-ray spectrometry in order to characterize the composition of the materials present in the painting panels. An unusual white pigment has been used in the zoomorphic pictographs of the Galb Budarga shelter which main components are the anhydrite (CaSO4) polymorphs I and II. Red and orange zoomorphic figures and ancient Berber scripts have been painted in the Tuama Budarga rock shelter. Haematite (α-Fe2O3) is the main component of the paints used; amorphous carbon and different manganese oxides have also been detected. Accretions of gypsum (CaSO4·2H2O) and anhydrite have been observed on the shelter wall used to paint. α-Quartz (α-SiO2), albite (NaAlSi3O8), dolomite, CaMg(CO3)2, calcite (CaCO3) and traces of hydroxylapatite (Ca10(PO4)6(OH)2) have been identified in the rocks supporting the paintings of both sites. Layers of calcium oxalates, whewellite (CaC2O4·H2O) and weddellite (CaC2O4·(2 + x)H2O, x ≤ 0.5) cover the pictorial panels of these rock shelters. A microestratrigraphic study of the paint used in the Tuama Budarga shelter revealed that the pigment layer is bracketed between oxalate layers.
Palabras clave Rock art painting
Micro-Raman spectroscopy
Haematite
Anhydrite
Editor(es) Elsevier
Fecha 2018-03
Formato application/pdf
Identificador bibliuned:DptoCTFQ-FCIE-Articulos-Jmgavira-0001
http://e-spacio.uned.es/fez/view/bibliuned:DptoCTFQ-FCIE-Articulos-Jmgavira-0001
DOI - identifier 10.1016/j.microc.2017.10.019
ISSN - identifier 1095-9149
Nombre de la revista Microchemical Journal
Número de Volumen 137
Publicado en la Revista Microchemical Journal Volume 137, March 2018, Pages 250-257
Idioma eng
Versión de la publicación acceptedVersion
Tipo de recurso Article
Derechos de acceso y licencia http://creativecommons.org/licenses/by-nc-nd/4.0
info:eu-repo/semantics/openAccess
Tipo de acceso Acceso abierto
Notas adicionales The registered version of this article, first published in Microchemical Journal , is available online at the publisher's website: Elsevier, https://doi.org/10.1016/j.microc.2017.10.019

 
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