Data/hora: 05/06/2024 12:26:52

Biblioteca(s): 	Embrapa Solos.	
Data corrente: 	22/11/2002	
Data da última atualização: 	22/11/2002	
Autoria: 	RAUEN, M. de J.	
Título: 	Mineralogical identification of a toposequence of soils from basaltic rocks in the state of Parana, Brasil.	
Ano de publicação: 	1980	
Fonte/Imprenta: 	s.l.: Purdue University, 1980.	
Páginas: 	161p.	
Idioma: 	Inglês	
Notas: 	Tese Mestrado.	
Conteúdo: 	A very common toposequence of soils from basaltic rocks in the tropical part of the State of Parana was studied. This toposequence includes an Alic Dusky Red Latosol, a Dystrophic Dusky Red Latosol (both oxisols), a Terra Rox Estruturada (Alfisol), and a Brunizem (Mollisol). The main objective was to accumulate information that would lead to a better understanding of the mineralogical content of these soils. The recycling of nutrients due to the natural vegetation had a paramount influence on the fertility of the topsoil of the Dystrophic Dusky Red Latosol and Terra Roxa Estruturada. Fine clays (<.2um) are high in the solum of all these soils (over 77% of the clay fraction). The fine clays are mainly kaolinite but poorly crystalized hematite also is present. Gibbsite was found in significant quantities only in the Alic Dusky Red Latosol. the mineralogy of coarse clay includes disordered kaolinite, but very well crystalized gibbsite, hematite and vermiculite/chloriteintergade. Gibbsite along with vermiculite/chlorite was found in the coarse clay of both Dusky Red Latosols and Terra Roxa Estruturada. In the latter soil these minerals decrease in depth, even disappearing in the BC horizon. Since vermiculite/chlorite was not found in the BC horizont of the Terra Roxa Estruturada and the entire Brunizem profile, it is possible that some Al 3+ has been concentrated with the weathering and deposited beteween the layers of some 2:1 clay minerals, possible vermiculite or mica. In this condition vermiculita/chlorite with....	
Palavras-Chave: 	Solos.	
Thesagro: 	Análise Física; Análise Química; Mineralogia; Oxisol.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Solos (CNPS)	
Exemplares: 	CNPS - (4134-1) - ADD - TS - -- - 80001 - RAU/80 - 1997.00789 - DIS