The use of FT-IR spectroscopy and SEM/EDS characterization of slips and pigments to determine the provenances of archaeological ceramics: The case of Guanacaste ceramics (Costa Rica)
Fernández Esquivel, Patricia María
Sibaja Conejo, Paula
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In this paper, the red and black pigments and slips of 63 Guanacaste ceramics were analyzed by Scanning Electronic Microscopy and infrared spectroscopy. All the pigment layers were made by dilution of a pure pigment in the slip layer. Red pigments were made using hematite, sometime in association with maghemite, mixed in the slip geomaterial. Black pigments were made of manganese oxide, sometime in association with magnetite. Methodologically speaking, we clearly showed that the FT-IR analysis of the slip layer could allow a fast and pertinent discrimination of different sites of ceramic production according to their chemical compositions. Such approach could allow easier, cheaper and faster analytical analysis to answer to provenance study of archeo- logical ceramics. In fact, the different ceramic types shared similar slip compositions with no correlation with the excavation site, showing that slip ceramics are relevant to trace Guanacaste ceramics in their exchanges or trades up to the Central Valley. Moreover, no local reproduction of Guanacaste styles in the central valley was noticed in this study. Meta-kaolinite and meta-smectite, different types of tectosilicates as quartz and cristobalite, he- matite and feldspar were notably detected in slip layers. The Agglomerative Hierarchical Clustering and Principal Component Analysis of slip infrared spectra showed the presence of three distinct clusters in great accordance with actual knowledge on the ceramic production in the area. Finally, the heating temperatures were estimated between 670 and 870 ◦C during the fabrication processes, with almost no significant difference due to school or ceramic types.
External link to the item10.1016/j.microc.2020.105838
- Antropología