Data/hora: 06/06/2024 07:42:16

Provedor de dados: 	36	
País: 	Brazil	
Título: 	The ceramic artifacts in archaeological black earth (terra preta) from lower Amazon region, Brazil: mineralogy	
Autores: 	Costa,Marcondes Lima da; Kern,Dirse Clara; Pinto,Alice Helena Eleotério; Souza,Jorge Raimundo da Trindade.	
Data: 	2004-01-01	
Ano: 	2004	
Palavras-chave: 	Terra Preta; Black Earth; Archaeological ceramic fragment; Lower Amazon; Phosphates; Mineralogy.	
Resumo: 	Several archaeological black earth (ABE) sites occur in the Amazon region. They contain fragments of ceramic artifacts, which are very important for the archaeological purpose. In order to improve the archaeological study in the region we carried out a detailed mineralogical and chemical study of the fragments of ceramic artifacts found in the two ABE sites of Cachoeira-Porteira, in the Lower Amazon Region. Their ceramics comprise the following tempers: cauixi, cariapé, sand, sand +feldspars, crushed ceramic and so on and are composed of quartz, clay equivalent material (mainly burned kaolinite), feldspars, hematite, goethite, maghemite, phosphates, anatase, and minerals of Mn and Ba. Cauixi and cariapé, siliceous organic compounds, were found too. The mineralogical composition and the morphology of their grains indicate a saprolite (clayey material rich on quartz) derived from fine-grained felsic igneous rocks or sedimentary rocks as source material for ceramic artifacts, where silica-rich components such cauixi, cariapé and/or sand (feldspar and rock fragments) were intentionally added to them. The high content of (Al,Fe)-phosphates, amorphous to low crystalline, must be product of the contact between the clayey matrix of pottery wall and the hot aqueous solution formed during the daily cooking of animal foods (main source of phosphor). The phosphate crystallization took place during the discharge of the potteries put together with waste of organic material from animal and vegetal origin, and leaving to the formation of the ABE-soil profile.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672004000200004	
Editor: 	Instituto Nacional de Pesquisas da Amazônia	
Relação: 	10.1590/S0044-59672004000200004	
Formato: 	text/html	
Fonte: 	Acta Amazonica  v.34 n.2 2004	
Fonte: 	info:eu-repo/semantics/openAccess