Argillic Horizons Without Clay Skins

Nettleton, W. D.; Flach, Klaus W.; Brasher, B. R.

doi:10.2136/sssaj1969.03615995003300010032x

Cited by 82 publications

(15 citation statements)

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“…Either strategy can be laborious and fraught with challenges (Nettleton et al, 1969(Nettleton et al, , 1987Mccarthy and Mckay, 2004) and yet not clearly distinguish the relative magnitudes of solute versus colloid movement. For instance, the prevalence of clay in the downslope position at the Kruger catena is consistent with translocation from the upslope positions, but could also be due to in situ formation from transported ions or from recombination of in situ weathering products.…”

Section: The Promise Of the Dual-phase Mass Balance Modelmentioning

confidence: 99%

Quantification of colloidal and aqueous element transfer in soils: The dual-phase mass balance model

Bern

Thompson

Chadwick

2015

Geochimica et Cosmochimica Acta

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Mass balance models have become standard tools for characterizing element gains and losses and volumetric change during weathering and soil development. However, they rely on the assumption of complete immobility for an index element such as Ti or Zr. Here we describe a dual-phase mass balance model that eliminates the need for an assumption of immobility and in the process quantifies the contribution of aqueous versus colloidal element transfer. In the model, the high field strength elements Ti and Zr are assumed to be mobile only as suspended solids (colloids) and can therefore be used to distinguish elemental redistribution via colloids from redistribution via dissolved aqueous solutes. Calculations are based upon element concentrations in soil, parent material, and colloids dispersed from soil in the laboratory. We illustrate the utility of this model using a catena in South Africa. Traditional mass balance models systematically distort elemental gains and losses and changes in soil volume in this catena due to significant redistribution of Zr-bearing colloids. Applying the dual-phase model accounts for this colloidal redistribution and we find that the process accounts for a substantial portion of the major element (e.g., Al, Fe and Si) loss from eluvial soil. In addition, we find that in illuvial soils along this catena, gains of colloidal material significantly offset aqueous elemental loss. In other settings, processes such as accumulation of exogenous dust can mimic the geochemical effects of colloid redistribution and we suggest strategies for distinguishing between the two. The movement of clays and colloidal material is a major process in weathering and pedogenesis; the mass balance model presented here is a tool for quantifying effects of that process over time scales of soil development. Published by Elsevier Ltd.

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Section: The Promise Of the Dual-phase Mass Balance Modelmentioning

confidence: 99%

Quantification of colloidal and aqueous element transfer in soils: The dual-phase mass balance model

Bern

Thompson

Chadwick

2015

Geochimica et Cosmochimica Acta

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“…Vários estudos clássicos têm comprovado que muitos solos que demonstram cerosidade no exame macromorfológico não apresentam cutãs, quando do estudo ao microscópio ótico (Nettleton et al, 1969;McKeague et al, 1978McKeague et al, , 1981Chittleborough & Oades, 1980). Tal comportamento pode, em parte, ser explicado pela ação da pedoplasmação, por ação biológica ou por alterações volumétricas na massa do solo por repetidos ciclos de contração e expansão provocados pelo ressecamento e umedecimento do solo (Bennema et al, 1970).…”

Section: Processos Pedogenéticos Envolvidos Na Formação Do Gradiente unclassified

Pedogênese de uma seqüência de solos desenvolvidos de arenito na região de Piracicaba (SP)

Mafra

Silva

Cooper

et al. 2001

Rev. Bras. Ciênc. Solo

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RESUMOO trabalho abordou a formação de solos com horizonte B textural e teve por objetivo identificar os processos pedogenéticos envolvidos na formação de lamelas, do gradiente textural abrupto, assim como suas implicações sobre os atributos físicos, químicos e mineralógicos do solo. O estudo foi desenvolvido numa toposseqüência de solos derivados de arenito: o perfil (P1), ocorrendo na parte alta do relevo (topo); perfil (P2), na faixa intermediária (terço médio da encosta), e perfil (P3), no terço inferior da encosta. As análises realizadas foram: granulométrica, química, mineralógica e micromorfológica. Os perfis apresentaram seqüência de horizontes do tipo A-E-Bt, tendo sido classificados como Alissolos Crômicos. Os solos foram classificados como quimicamente ácidos, com mineralogia da fração argila mostrando predomínio de caulinita. Os materiais analisados evidenciaram uniformidade quanto à granulometria, diâmetro médio, arredondamento e relação zircão/turmalina das areias, assim como no aspecto morfológico, apontando para formação autóctone do solo. Os processos pedogenéticos responsáveis pela formação do gradiente textural foram a degradação das argilas em condições de oxirredução e a lessivagem. O primeiro processo foi constatado em microdomínios no contato E/Bt, onde se notaram cores de gleização, indicando encharcamento temporário. Neste caso, a formação do horizonte álbico deveu-se principalmente à destruição do topo do horizonte Bt. As lamelas nada mais seriam do que heranças do horizonte Bt no horizonte álbico. A presença de cerosidade, associada aos cutãs de iluviação no exame micromorfológico, revelou a participação do processo de lessivagem contribuindo para a diferenciação textural.Termos de indexação: B textural, ferrólise, lessivagem, micromorfologia, mineralogia, pedologia.

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“…More stability of pedon 1 compared to pedon 2 might be a reason for preserving clay skins. The absence of clay coating in thin sections of argillic horizons of highly calcareous soils of arid and semiarid regions is either tied to high shrink-swell potential, caused by the considerable amount of expandable clays (Nettleton et al, 1969;Nettleton and Peterson, 1983) or to the disruption force of growing crystals, such as gypsum or calcite (Khademi and Mermut, 2003) or to engulfment with carbonates (Mahmoodi, 1979). Soil horizons with high extensibility, were mostly missing clay coatings on the faces of peds because of high shrink-swell activity of the groundmass (Griffin and Buol, 1988).…”

Section: Soilsmentioning

confidence: 99%

Soil-landscape relationship as indicated by pedogenesis data on selected soils from Southwestern, Iran

Owliaie¹,

Najafi‐Ghiri²,

Shakeri³

2018

Eurasian Journal of Soil Science (Ejss)

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Article Info Received : 02.10.2017 Accepted : 02.01.2018 Soils of semiarid regions of Dehdasht and Choram in Southwestern Iran have formed on alluvium derived from mixed calcareous-gypsiferous materials from Lower Miocene to Upper Pliocene. In order to characterize and classify the soils and to determine the soillandscape relationship in the area, nine pedons located on different physiographic positions including plateau, river alluvial plain, piedmont plain, alluvial plain and alluvial fan have been described, sampled and analyzed. Physicochemical analyses, clay mineralogy and micromorphological studies were performed. The results showed that topography and parent material were two important soil forming factors affecting soil formation in the area. The soils were dominated by carbonate, gypsum, and clay illuviation and accumulation. More developed soils were found on the stable plateau and piedmont plain. Clay illuviation and argillic horizon development in soils of the more stable alluvial plain were assumed to be relict features from presumably more humid climates. Palygorskite, illite, chlorite, smectite, kaolinite, and quartz clay minerals were identified in almost all physiographic surfaces, but more palygorskite and less smectite were found in the soils with gypsiferous parent materials. Observations by SEM revealed the occurrence of neoformed palygorskite as thread-like faces and coating of gypsum crystals and marly matrix. Coating and infilling of gypsum and calcite crystals in voids and channels were common pedofeatures observed in the soils studied. Two different distribution patterns of Fe-Mn oxides were identified in aquic and non-aquic soils.

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Argillic Horizons Without Clay Skins

Cited by 82 publications

References 0 publications

Quantification of colloidal and aqueous element transfer in soils: The dual-phase mass balance model

Quantification of colloidal and aqueous element transfer in soils: The dual-phase mass balance model

Pedogênese de uma seqüência de solos desenvolvidos de arenito na região de Piracicaba (SP)

Soil-landscape relationship as indicated by pedogenesis data on selected soils from Southwestern, Iran

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