Data/hora: 13/06/2024 04:05:30

Provedor de dados: 	Brazilian Archives of Biology and Technology	
País: 	Brazil	
Título: 	Major soil classes of the metropolitan region of Curitiba (PR), Brazil: I - mineralogical characterization of the sand, silt and clay fractions	
Autores: 	Pires,Ana Christina Duarte; Melo,Vander de Freitas; Lima,Valmiqui Costa; Motta,Antônio Carlos Vargas.	
Data: 	2007-03-01	
Ano: 	2007	
Palavras-chave: 	Kaolinite; Crystalline and amorphous Fe and Al oxides; 2:1 minerals; XRD.	
Resumo: 	The aim of this work was to evaluate the mineralogical and chemical characteristics of most representative soils of the Region of Curitiba, Paraná State. Samples were collected at different depths. The results showed: (a) the quartz was the only identified mineral at the silt and sand fractions. The dominant clay mineral was Kaolinite, with contents ranging from 676.7 to 820.8 g kg-1. The gibbsite was also an important constituent of the most weathered horizons and the hematite and goethite contents were low, mainly in the Histosol; (b) at the C horizon of the Inceptisol, high intensity of vermiculite/smectite reflections were detected (X-ray diffraction), justifying the high capacity of expansion and contraction, normally showed for this soil horizon; (c) was observed a good relation between pedogenetic degree and crystallographic mineral characteristics.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000200001	
Editor: 	Instituto de Tecnologia do Paraná - Tecpar	
Relação: 	10.1590/S1516-89132007000200001	
Formato: 	text/html	
Fonte: 	Brazilian Archives of Biology and Technology  v.50 n.2 2007	
Fonte: 	info:eu-repo/semantics/openAccess