María Reinoso

X-ray diffraction and Raman spectroscopy study of white decorations on tricolored ceramics from Northwestern Argentina.

White virgules, commas, and dot designs on tricolored ceramics are sporadically found in different archaeological sites located in Northwestern Argentina area, as Puna and Quebrada de Humahuaca. This decorating style has been reported in several articles, but few previous archaeometric studies have been carried out on the pigment composition. Fragments from Puna and Quebrada archaeological sites, belonging to Regional Development Period (900-1430 AD), were analyzed by X-ray diffraction and Raman spectroscopy in order to characterize the pigments employed. Red and black pigments are based on iron and manganese oxides, as it has been extensively reported for the NW Argentina area. White pigments from white virgules, comma, and dot designs have shown different composition. Hydroxyapatite was found in samples from Doncellas site (North Puna region), and calcium and calcium-magnesium containing compounds, as vaterite and dolomite, along with titanium containing compounds were detected on samples from Abralaite (Central Puna region) and Gasoducto (Quebrada de Humahuaca region). It has been concluded that pigment composition is not characteristic of a unique region.

EMPLEO DE ESPECTROSCOPIA RAMAN, DIFRACCIÓN DE RAYOS X Y MICROSCOPIA ELECTRÓNICA PARA EL ANÁLISIS DE PIGMENTOS EN CERÁMICAS VAQUERÍAS

* M. Fabiana Bugliani, ConiCet-Museo Etnografico J. B. Ambrosetti, Universidad de Buenos Aires, Argentina, email: fbugliani@gmail.com ** Claudia Di Lello, CiCpBA-Museo de La Plata-FCnym-Unlp, email: cdilello@fenym.unlp.edu.ar *** Eleonora Freire, CNEA, Buenos Aires, Argentina, email: freire@tandar.cnea.gov.ar **** Griselda Polla, CNEA, Buenos Aires, Argentina, email: grispoll@cnea.gov.ar ***** Alicia Petragalli, CNEA, Buenos Aires, Argentina, email: petra@tandar.cnea.gov.ar ****** Maria Reinoso, CNEA, Buenos Aires, Argentina, email: reinoso@cnea.gov.ar ******* Emilia B. Halac, CNEA, Buenos Aires, Argentina, email: halac@cnea.gov.ar

ESTUDIO DE PIGMENTOS EN ALFARERÍA ESTILO NEGRO SOBRE ROJO DE QUEBRADA DE HUMAHUACA, JUJUY, ARGENTINA

En las piezas ceramicas Negro sobre Rojo de la Quebrada de Humahuaca pueden observarse atributos tecnologicos que aportan informacion sobre su variabilidad local y cronologica. En este trabajo se realiza el analisis de pigmentos sobre muestras ceramicas procedentes de dicha region, mediante diversas tecnicas arqueometricas. Algunas de uso ya comun, como la microscopia optica y la difraccion de rayos X, y otras de mas reciente aplicacion, como la espectroscopia Raman y la microscopia electronica de barrido con espectroscopia de energia dispersiva. La aplicacion combinada de diversas tecnicas y la discusion del caso con los distintos especialistas permitio establecer interpretaciones significativas a partir de los resultados obtenidos.