Data/hora: 10/06/2024 17:39:53

Provedor de dados: | 90
País: | Brazil
Título: | INTERNAL STRUCTURE OF A VERMICULAR IRONSTONE AS DETERMINED BY X-RAY COMPUTED TOMOGRAPHY SCANNING
Autores: | Zinn,Yuri Lopes; Carducci,Carla Eloize; Araujo,Marla Alessandra.
Data: | 2015-04-01
Ano: | 2015
Palavras-chave: | Laterite; Soils with plinthite; Density; Mineralogy.
Resumo: | Ironstones or petroplinthites are common materials in soils under humid tropical climate, generally defined as the result of Fe oxide accumulation in areas where the water table oscillates, and may exhibit considerable morphological variability. The aim of this study was to examine the internal structure and porosity of an ironstone fragment from a Petroferric Acrudox in Minas Gerais, Brazil, by computed tomography (CT) and conventional techniques. The sample analyzed had total porosity of 59.5 %, with large macropores in the form of tubular channels and irregular vughs, the latter with variable degrees of infilling by material released from the ironstone walls or the soil matrix. The CT scan also showed that the ironstone has wide variation in the density of the solid phase, most likely due to higher concentrations or thick intergrowths of hematite and magnetite/maghemite, especially in its outer rims. The implications of these results for water retention and soil formation in ironstone environments are briefly discussed.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000200345
Editor: | Sociedade Brasileira de Ciência do Solo
Relação: | 10.1590/01000683rbcs20140423
Formato: | text/html
Fonte: | Revista Brasileira de Ciência do Solo  v.39 n.2 2015
Fonte: | info:eu-repo/semantics/openAccess