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	Provedor de dados Anais da ABC (AABC) (1) Rev. Bras. Ciênc. Solo (1) Autor Heck,R. J. (1) Mermut,A. R. (1) PEREIRA,ANTONIO M. S. (1) SAMPAIO,FLÁVIO J. (1) Santos,M. C. (1) VILAS BÔAS,GERALDO S. (1) Mais... Palavra-chave Barreiras Group (2) Aluminum (1) Cenozoic (1) Citrate (1) Dithionite (1) Goethite (1) Hematite (1) Itapecuru Formation (1) Oxalate (1) Plinthosol (1) State of Bahia (1) Tertiary (1) Ustalf (1) X-ray diffraction (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2001 (1) 1999 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Iron oxides in plinthic soils on sedimentary deposits in northeastern Brazil Rev. Bras. Ciênc. Solo Heck,R. J.; Mermut,A. R.; Santos,M. C.. This study was conducted to examine the distribution and nature of Fe oxides in plinthic soils on the sediments of Barreiras Group (in the state of Piauí) and Itapecuru Formation (in the state of Maranhão) in Northeastern Brazil. Four pedons were selected: a "plinthic, dystrophic, epieutrophic Gray Podzolic with low activity clay" and a "dystrophic Plinthosol with low activity clay" (both Plinthic Kandiustalfs) on the Barreiras sediments, as well as an "eutrophic Plinthosol with low activity clay" and an "allic Plinthosol with low activity clay" (both Plinthustalfs) on the Itapecuru sediments. Soil samples were fractionated into > 2 mm (pisoliths), water-stable aggregates (plinthite) and matrices; the aggregates and matrices were further fractionated... Tipo: Info:eu-repo/semantics/article Palavras-chave: Plinthosol; Ustalf; Barreiras Group; Itapecuru Formation; Citrate; Dithionite; Oxalate; X-ray diffraction; Aluminum; Goethite; Hematite. Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06831999000300019 The Barreiras Group in the Northeastern coast of the State of Bahia, Brazil: depositional mechanisms and processes Anais da ABC (AABC) VILAS BÔAS,GERALDO S.; SAMPAIO,FLÁVIO J.; PEREIRA,ANTONIO M. S.. The Barreiras Group is a Miocene to Lower Pleistocene continental terrigenous sedimentary deposit exhibiting a large occurrence along the Brazilian coast. In the Conde region, located in the northeastern part of the State of Bahia, the sedimentological characteristics of these sediments are indicative of a deposition as gravelly and sandy bed load in braided fluvial systems, related to alluvial fans, under an arid to semi-arid climate. The basal portion of the group is dominated by a gravelly-sandy lithofacies deposited by debris flows and pseudoplastic debris flows, with lesser occurrences of subaqueous deposits, characterizing a proximal fluvial system deposition. The upper portion is made up of gravelly-sandy sediments that include subaqueous, debris... Tipo: Info:eu-repo/semantics/article Palavras-chave: Barreiras Group; Tertiary; Cenozoic; State of Bahia. Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300010 Registros recuperados: 2 Primeira ... 1 ... Última

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