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dc.contributor.authorCavalcante, Luis Carlos Duarte-
dc.contributor.authorSilva, Heralda Kelis Sousa Bezerra da-
dc.contributor.authorFabris, José Domingos-
dc.contributor.authorArdisson, José Domingos-
dc.identifier.citationCAVALCANTE, Luis Carlos Duarte; SILVA, Heralda Kelis Sousa Bezerra da; FABRIS, Jose Domingos; ARDISSON, Jose Domingos. Red and yellow ochres from the archaeological site Pedra. Hyperfine interactions, 238, 7p., 2017.pt_BR
dc.description.abstractThe archaeological site Pedra do Cantagalo I is a sandstone shelter displaying rupestrian inscriptions. It is located in the rural area of the municipality of Piripiri, in the northern region of the Piau´ı state, Brazil. The site was found as being originally decorated with more than 1,900 prehistoric rupestrian paintings, along with engravings, lithics, ceramic fragments and mineral pigments forming reddish and yellowish ochres. Materials of these ochres, collected from recent excavations in this archaeological site, were analyzed by energy dispersive X-ray fluorescence (EDXRF); backscattering and transmission 57Fe-Mossbauer spectroscopy at 298 K and 25 K and powder X-ray diffraction (XRD), in ¨ an effort to assess the chemical and mineralogical characteristics of these sources of pigments that composed the ancient paint materials of the site. The iron contents (expressed as Fe2O3) for the reddish ochres were found to range from ∼60 to ∼68 mass%; for the yellowish ochres the corresponding content was ∼34 mass%, as determined by EDXRF. From the Mossbauer spectra for these red ochre samples, hematite ( ¨ αFe2O3) or a mixture of hematite and goethite (αFeOOH) were identified. Actually, the spectra at room temperature for the yellow ochres are rather complex, as it is usual for most soil clay materials. At least part of the intense central doublet was assumed to be from superparamagnetic iron oxides in very small particles. The Mossbauer patterns at 25 K allowed confirming this assumption, as the ¨superparamagnetic relaxation effects were virtually suppressed; the spectral contributions due to goethite could be thus more easily separated.pt_BR
dc.subjectArchaeological sitespt_BR
dc.subjectMoessbayer effectpt_BR
dc.titleRed and yellow ochres from the archaeological site Pedra do CantagaloI, in Piripiri, Piaui, Brazilpt_BR
dc.typeArtigo Periódicopt_BR
dc.creator.affiliationUniversidade Federal do Piauí, UFPI, Teresina, PI, Brazilpt_BR
dc.creator.affiliationUniversidade Federal de Minas Gerais, UFMG, Belo Horizonte, MG, Brazilpt_BR
dc.creator.affiliationUniversidade Federal do Vale do Jequitinhonha e Mucuri, Diamantina, MG, Brazilpt_BR
dc.creator.affiliationCentro de Desenvolvimento da Tecnologia de Minas Gerais, CDTN, Belo Horizonte, MG, Brazilpt_BR
dc.title.journalHyperfine interactionspt_BR
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