Vol. 43 (2019), pp. 20–34 • 4.30 MB • português
Análise químico-mineralógica e parâmetros de queima de cerâmicas do sítio arqueológico Entrada do Caminho da Caiçara, Brasil
Chemical-Mineralogical Analysis and Ceramic Firing Parameters from the Entrada do Caminho da Caiçara Archaeological Site, Brazil
Luis Carlos Duarte Cavalcante, José Weverton Lima de Sousa,
Heralda Kelis Sousa Bezerra da Silva
Samples of the ceramic materials from the Entrada do Caminho da Caiçara archaeological site, located in the rural area of the municipality of Piripiri, Piaui, Brazil, were examined under stereomicroscope and analyzed by X-ray fluorescence, CHN elemental analysis, Fourier-transform infrared absorption spectroscopy, X-ray diffractometry and Mössbauer spectroscopy for information about different patterns in firing. The Mössbauer spectra, obtained in 298 K and 30 K, are dominated by Fe3+, Fe2+ and Fe2.5+ doublets. In some cases, a fraction of the ferruginous species of these materials order magnetically at 298 K, showing a sextet with magnetic hyperfine field attributed to hematite (αFe2O3). However, some samples only order magnetically at low temperature, 30 K. Quartz, anatase, kaolinite and feldspar were also identified. The occurrence of kaolinite in two samples indicates firing at a temperature lower than 500 °C and general data indicate that the other pieces must have been fired at 550 to 950 °C. The Fe3+ and Fe2+ proportions in these materials indicate a dynamic atmosphere in the firing environment, suggesting the use of open air firing.
Archaeological ceramic; firing environment; firing temperature; Mössbauer spectroscopy; archaeometry.
Cavalcante, L. C. D., J. W. L. Sousa, H. K. S. B. Silva. 2019. Análise químico-mineralógica e parâmetros de queima de cerâmicas do sítio arqueológico Entrada do Caminho da Caiçara, Brasil. Arqueología Iberoamericana 43: 20-34.
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Publication date: July 26, 2019.
© 2019 ARQUEOLOGIA IBEROAMERICANA. ISSN 1989-4104. License CC BY 3.0 ES.
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