Characterization and distribution of pyrogenic carbon in a fraction of archaeological black earth from Caxiuanã


Autoria(s): MORAES, Milena Carvalho de; LEMOS, Vanda Porpino; MORAES, Dorsan dos Santos; MORAES, Cláudio Nery Lamarão
Data(s)

10/11/2015

10/11/2015

01/08/2015

Resumo

This study aims to determine the atomic ratio of O/C in an archaeological black earth (ABE) profile of the Ilha de Terra site, a region of Caxiuanã in the Pará State, Brazil, to determine the types of pyrogenic carbon (PyC) particles and to infer the source of biomass and burning temperature necessary to produce the PyC. The O/C ratios were monitored using scanning electron microscopy combined with energy dispersive spectroscopy (SEM/EDS). The results indicated atomic ratios for clay, silt and fine sand fractions that were between those registered for the PyC particles types: condensed combustion (CC) (0.09, 0.1, 0.13), charcoal (0.32, 0.31, 0.34) and char (0.43, 0.45, 0.52). CC is the predominant type of particle found because of the high firing temperature (> 350 °C), which is consistent with the probable biomass sources of wood, cellulose and lignin.

Identificador

MORAES, Milena Carvalho de et al. Characterization and distribution of pyrogenic carbon in a fraction of archaeological black earth from Caxiuanã. Journal of the Brazilian Chemical Society, São Paulo, v. 26, n. 8, p. 1664-1673, ago. 2015. Disponível em: <http://www.scielo.br/pdf/jbchs/v26n8/0103-5053-jbchs-26-08-1664.pdf>. Acesso em: 5 nov. 2015. <http://dx.doi.org/10.5935/0103-5053.20150140>.

1678-4790

http://repositorio.ufpa.br/jspui/handle/2011/6978

Idioma(s)

eng

Palavras-Chave #Carbono pirogênico #Terra preta arqueológica #Combustão condensada #Sítio arqueológico Ilha Preta - PA #Floresta Nacional de Caxiuanã - PA #Portel - PA #Pará - Estado #Amazônia Brasileira
Tipo

article