Estimating relative ages from iron-oxide/total-iron ratios of soils in the western Po Valley, Italy

Arduino, E.; Barberis, Elisabetta; Carraro, Francesco; Forno, Maria Gabriella

doi:10.1016/0016-7061(84)90088-0

Cited by 86 publications

(46 citation statements)

References 4 publications

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“…Data for iron forms found in this work were quite similar to other studies [25] or a little lower [3]. Our data showed that among the ''youngest'' (in terms of sediment deposition and age of present tree population) sites H1, H2 and H3, the stability of aggregates increased with the increase of various iron forms proportions.…”

Section: Physicochemical Characteristicssupporting

confidence: 90%

Influence of some physicochemical and biological parameters on soil structure formation in alluvial soils

Bullinger-Weber

Bayon

Guénat

et al. 2007

European Journal of Soil Biology

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This study examines the role of abiotic (texture, calcium carbonates or iron) and biotic parameters (earthworm and enchytraeid activities) on the initial phases of soil aggregation. Our research focused on humus forms in alluvial soils, which are considered as young and heterogeneous environments. We hypothesized that the soil structure formation is determined by both the nature of the recent alluvial deposits and the soil fauna. For this purpose, six sites were chosen throughout two types of softwood forests (willow and alder forest) representing two stages of vegetation succession. Evidence of soil texture influence on aggregate stability was observed. A dominance of a coarse sand fraction caused a quick colonization of enchytraeids and epigeic earthworms while a silty texture favoured the presence of anecic earthworms, thus increasing the aggregate stabilisation. Iron forms, acting as cementing agents, were observed in the coarse silt, while calcium carbonates were equally distributed among the textural fractions. Active calcium carbonate fraction, binding organic matter with mineral components, was not found in the coarse sand fraction. In conclusion, the tree age cannot alone be used as an indicator of the humus form evolution but biological and physicochemical parameters also influence the initial steps of soil structuration.

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Section: Physicochemical Characteristicssupporting

confidence: 90%

Influence of some physicochemical and biological parameters on soil structure formation in alluvial soils

Bullinger-Weber

Bayon

Guénat

et al. 2007

European Journal of Soil Biology

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“…Registros geomorfológicos e sedimentológicos, estudados em outras regiões de Minas Gerais (Lichte, 1991;Moreira, 1992;Bacellar, 2000), sugerem diferenciação do regime climático atual predominante em regiões tropicais, com sazonalidade de duas estações bem marcadas ao longo do ano, uma seca e outra úmida. Esses mecanismos de formação dos óxidos de ferro atuam como indicadores pedogênicos (Arduino et al, 1984(Arduino et al, , 1986. Os baixos valores de ferro total verificados nos resultados de composição química (Tabela 1), Tabela 2.…”

Section: Resultsunclassified

“…Muitos estudos de horizontes B ferruginosos têm apresentado resultados que estabelecem estreita relação entre a mineralogia dos óxidos de ferro (termo genérico que denota também hidróxidos ou oxidróxidos), processos de microagregação de partículas (Arduino et al, 1989;Goldberg, 1989;Colombo & Torrent, 1991;Pinheiro-Dick & Schwertmann, 1996;Alekseeva et al, 1999) e susceptibilidade erosiva (Galvão & Schulze, 1996;Rhoton et al, 1998;Figueiredo et al, 1999), além de servir de traçador na reconstituição da paleodinâmica ambiental (Arduino et al, 1984;Arduino et al, 1986).…”

Section: Introductionunclassified

Óxidos de ferro de solos formados sobre gnaisse do Complexo Bação, Quadrilátero Ferrífero, Minas Gerais

Figueiredo

Fabris

Varajão

et al. 2006

Pesq. agropec. bras.

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O objetivo deste trabalho foi efetuar a caracterização mineralógica dos óxidos de ferro de horizontes B de três perfis de solos desenvolvidos sobre gnaisse do geodomínio do Complexo Bação, no Quadrilátero Ferrífero, em Minas Gerais. As amostras foram coletadas ao longo dos segmentos de alta, média e baixa vertente. As frações de terra fina (diâmetro médio, fi = 2 mm) foram separadas, em todas as amostras. A composição química dos elementos maiores foi determinada por meio da técnica de fluorescência de raios X; a análise mineralógica foi realizada com difratometria de raios X e espectroscopia Mössbauer. Todas as amostras têm composição mineralógica similar, cuja ocorrência geral corresponde à seqüência quartzo >> gibbsita > caulinita > goethita. Os resultados Mössbauer a 4,2 K confirmam a coexistência de goethita (majoritária) e hematita. Os conteúdos de alumínio isomórfico foram deduzidos dos valores de campos hiperfinos e correspondem às seguintes fórmulas químicas das goethitas: alfaFe0,79Al0,21OOH (alta vertente), alfaFe0,75Al0,25OOH (meia vertente) e alfaFe0,78Al0,22OOH (baixa vertente). A dinâmica de transformação dos óxidos de ferro nos horizontes B ao longo da vertente é um indicador das oscilações paleoclimáticas na área: goethita mais aluminosa é um indicador do paleoambiente úmido, e goethita menos aluminosa revela condições pedogênicas mais secas.

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“…Pedons LC-1 and LC-2 contained higher amounts of chlorite and illite but lower amounts of kaolinite, quartz and gibbsite, and pedons LC-3 and LC-4 contained lower chlorite and illite but higher kaolinite and secondary oxide minerals. The presence of kaolinite and gibbsite as well as the absence of montmorillonite indicated high degrees of leaching and desilication of the soils (Muhs 1982;Arduino et al 1984Arduino et al , 1986, resulting in the decrease in weatherable primary mineral content. In comparison, the interstratified minerals of vermiculite-illite as a product of alteration from illite represented a weaker degree of leaching and desilication of the soils, but these mixed layered minerals can not be found in this study.…”

Section: Clay Mineralogymentioning

confidence: 99%

Geomorphological and paleoclimatic implications of soil development from siliceous materials on the coral-reef terraces of Liuchiu Island in southern Taiwan

Cheng

Jien

Tsai

et al. 2011

Soil Science and Plant Nutrition

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Liuchiu Island is an uplifted coral-reef island located off southwestern Taiwan. A total of four soil pedons, labeled as LC-1 and LC-2 from the Holocene terraces and LC-3 and LC-4 from the Pleistocene terraces, were sampled on the island for this work. These soils were siliceous, and were characterized by enrichment of clay and free iron (Fe d ). According to Soil Taxonomy, pedons LC-3 and LC-4 were classified as Paleudults and pedons LC-1 and LC-2 were Dystrudepts. The soil properties showed progressive changes from pedon LC-1 to pedon LC-4 in morphology, physical and chemical properties, and clay mineralogy. The contents of total Fe and dithionite-citrate-bicarbonate extractable Fe were significantly higher in pedons LC-3 and LC-4 with high weathering degree than in pedons of LC-1 and LC-2 with less weathering degree. Enrichment of kaolinite and gibbsite in pedons LC-3 and LC-4 also suggested high chemical weathering degree of the soils. The estimated soil ages for all studied pedons were consistent with their degrees in pedogenesis, where pedons LC-3 and LC-4 were located at older terraces and pedons LC-1 and LC-2 were located at younger terraces. Namely, it complied with the geologic interpretation of the continuous and simultaneous uplift and tilt of the island over time. Instead of the in situ weathering from the underlying coral reef limestone, all soils developed from siliceous parent materials deposited onto the surfaces. The SiO 2 /Al 2 O 3 ratios of soils indicated a component of loess may have been incorporated from continental China as part of the parent material, which confirmed a climate change of strong monsoons or severe dust storms occurred before the Holocene. However, soil development increased by the subsequent warm and humid climates of the interglacial stage over time.

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Estimating relative ages from iron-oxide/total-iron ratios of soils in the western Po Valley, Italy

Cited by 86 publications

References 4 publications

Influence of some physicochemical and biological parameters on soil structure formation in alluvial soils

Influence of some physicochemical and biological parameters on soil structure formation in alluvial soils

Óxidos de ferro de solos formados sobre gnaisse do Complexo Bação, Quadrilátero Ferrífero, Minas Gerais

Geomorphological and paleoclimatic implications of soil development from siliceous materials on the coral-reef terraces of Liuchiu Island in southern Taiwan

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