Tillage-Enhanced Argillic Horizon Development in Piedmont Soils

Soil Horizons ◽  
2010 ◽  
Vol 51 (2) ◽  
pp. 53
Author(s):  
Russell L. Losco ◽  
Martin F. Helmke
Keyword(s):  
Argillic Horizon

Absence of Glaciation in Illinois during Marine Isotope Stages 3 through 5

1996 ◽  
Vol 46 (1) ◽  
pp. 19-26 ◽  
Author(s):  
B. Brandon Curry ◽  
Milan J. Pavich
Keyword(s):  
Oxygen Isotope ◽  
Late Stage ◽  
Lake Michigan ◽  
Early Stage ◽  
Ice Sheet ◽  
Laurentide Ice Sheet ◽  
Argillic Horizon ◽  
Late Wisconsinan ◽  
Lake Michigan Lobe

A10Be inventory and14C ages of material from a core from northernmost Illinois support previous interpretations that this area was ice free from ca. 155,000 to 25,000 yr ago. During much of this period, from about 155,000 to 55,000 yr ago, 10Be accumulated in the argillic horizon of the Sangamon Geosol. Wisconsinan loess, containing inherited 10Be, was deposited above the Sangamon Geosol from ca. 55,000 to 25,000 yr ago and was subsequently buried by late Wisconsinan till deposited by the Lake Michigan Lobe of the Laurentide Ice Sheet. The Sangamonian interglacial stage has been correlated narrowly to marine oxygen isotope substage 5e; our data indicate instead that the Sangamon Geosol developed during late stage 6, all of stages 5 and 4, and early stage 3.

Characteristics of clay minerals in soil particles from an argillic horizon of Alfisol in central China

2018 ◽  
Vol 151 ◽  
pp. 148-156 ◽  
Author(s):  
Georges Martial Ndzana ◽  
Li Huang ◽  
Jin Bo Wang ◽  
Zhi Yi Zhang
Keyword(s):  
Clay Minerals ◽  
Central China ◽  
Soil Particles ◽  
Argillic Horizon

scholarly journals UTILIZAÇÃO DO MICROSCÓPIO ELETRÔNICO DE VARREDURA (MEV) PARA O RECONHECIMENTO DE REVESTIMENTOS ARGILOSOS

2003 ◽  
Vol 53 ◽  
Author(s):  
Leonardo José Cordeiro Santos ◽  
Janine Berrier ◽  
Michel Grimaldi ◽  
Selma Simões De Castro
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Sao Paulo ◽  
São Paulo ◽  
Additional Information ◽  
Argillic Horizon ◽  
Superior Portion ◽  
Cretaceous Period ◽  
Scanning Electron

Diversos autores têm ressaltado, nos seus trabalhos de pesquisa, uma certa dificuldade na identificação de revestimentos argilosos em observações de campo e de laboratório. O presente trabalho tem por objetivo avaliar a importância da utilização do Microscópio Eletrônico de Varredura (MEV) na identificação e na caracterização destas feições pedológicas encontradas em Argissolos nas proximidades de Bauru-SP. A área de estudo situa-se no oeste do estado de São Paulo, onde o quadro geológico regional é dominado por rochas sedimentares da Formação Marília, Grupo Bauru (Cretáceo da Bacia do Paraná), associadas aos Latossolos e aos Argissolos. Os estudos foram desenvolvidos no laboratório de Ciência do Solo do INRA/ Rennes (França). Um MEV possibilitou a observação e a caracterização química pontual das amostras. Foram utilizadas lâminas delgadas de solo de pequenas dimensões (4,5 X 7 cm) e pequenos torrões de solo (1 cm 3 ) com estrutura preservada. O MEV mostrou-se uma ferramenta eficaz nos estudos de gênese dos solos. Os resultados revelaram ainda que os revestimentos argilosos encontrados no topo no horizonte Bt dos Argissolos apresentam limite nítido com o fundo matricial, forte birrefringência, microlaminação, além da orientação das argilas paralela à parede dos poros, essas características indicam um processo de iluviação mecânica das argilas. As microanálises efetuadas nos revestimentos argilosos forneceram infor-mações adicionais àquelas obtidas com o estudo micromorfológico, principalmente por mostrar a existência de forte variação dos elementos ao longo das microestratificações. THE USE SCANNING ELECTRON MICROSCOPY (SEM) TO RECOGNITION OF CLAY COATINGS Abstract Many authors have been pointing out the difficulties of identification of clay coatings in field and laboratory observations. This work aims at estimating the importance of the Scanning Electron Microscopy (SEM) at the characterization and identification of these pedologicals features found in Alfisols in Bauru (SP) region. The studied region is located in the western part of São Paulo State, where the regional geology is dominated by sedimentary rocks from Marília Formation of Bauru Group (Cretaceous period), associated with soils of Alfisol and Oxisol type (figure 1). The studies were developed at the INRA/Rennes Soil Science laboratory. A Phillips XL20 scanning electron microscopy connected to an EDS spectrometer make the observation and punctual chemistry characterization of the samples possible. Soil thin blades of small dimensions (4,5 X 7,0 cm) and small soil lumps (1,0 cm³) with preserved structure were used. The SEM showed to be an effective tool in soils genesis studies. The results showed that the clay coatings found in the chambers porosity from the superior portion of argillic horizon in Alfisols present a clear boundary with the immediately underlying soil materials, strong birrefringence, micro lamination, besides the orientation of the clays parallel to the pores wall, indicating a mechanic illuviation process of the clay (figures 2 to 6). The microanalyses done in clay coatings found in the argillic horizon, gave additional information to those acquired from the micromorphological studies, especially for showing the existence of a strong variation of the oxides elements through the micro laminations (figure 9 and table 1).

Holocene Soils and Soil-Geomorphic Relations in an Arid Region of Southern New Mexico

1975 ◽  
Vol 5 (3) ◽  
pp. 321-360 ◽  
Author(s):  
Leland H. Gile
Keyword(s):  
New Mexico ◽  
Arid Region ◽  
Soil Horizons ◽  
Initial Development ◽  
Parent Materials ◽  
The Holocene ◽  
Argillic Horizon ◽  
Valley Fills ◽  
Soil Age ◽  
High Carbonate

A study area in an arid region of southern New Mexico is in basin-and-range topography and includes both a river valley and a closed basin. Holocene soils occur in valley fills and low terraces between Pleistocene fans, in and near drainageways on the fan-piedmont, on ridges, and in dunes. Holocene soils suggest the character of initial development in soils that are much older and more complex, and record the beginnings of various soil horizons. Noncalcareous brown or reddish brown B horizons have formed in low-carbonate parent materials of stable sites. Incipient development of the argillic horizon and the Haplargids occurs at stable sites in very gravelly materials that are about 1–2000 yr old. The cambic horizon and Camborthids occur in adjacent low-gravel materials of the same age. The argillic horizon occurs continuously in soils of earliest Holocene, particularly in very gravelly materials. Where soils have been truncated, as in areas affected by landscape dissection, argillic and cambic horizons are usually absent and the soils are Torripsamments, Torriorthents, or Torrifluvents depending on content of sand, gravel, and organic carbon. In high-carbonate parent materials, noncalcareous, reddish brown B horizons have not formed at any time in the Holocene. Most of these soils are Torriorthents or Torrifluvents although an incipient calcic horizon has formed in some of the oldest Holocene soils; the latter are Calciorthids. Horizons of carbonate accumulation are the best and most common pedogenic indicators of soil age. Stage I carbonate horizons are a major feature of pedogenesis in the Holocene. Because of additions of carbonate from the atmosphere, carbonate horizons are morphologically similar whether they have formed in high or low-carbonate alluvium. The carbonate accumulations are illuvial.Some Holocene deposits apparently resulted from changes in climate. Others, such as the youthful deposits of coppice dunes, apparently were caused by man's introduction of cattle and subsequent overgrazing and seed dispersal.

Argillic horizon development in calcareous soils of arid and semiarid regions of southern Iran

CATENA ◽  
2003 ◽  
Vol 53 (3) ◽  
pp. 273-301 ◽  
Author(s):  
F Khormali ◽  
A Abtahi ◽  
S Mahmoodi ◽  
G Stoops
Keyword(s):  
Calcareous Soils ◽  
Semiarid Regions ◽  
Southern Iran ◽  
Argillic Horizon ◽  
Arid And Semiarid

MORPHOLOGY OF THE ARGILLIC HORIZON IN DESERT SOILS OF SOUTHERN NEW MEXICO

Soil Science ◽  
1968 ◽  
Vol 106 (1) ◽  
pp. 6-15 ◽  
Author(s):  
L. H. GILE ◽  
R. B. GROSSMAN
Keyword(s):  
New Mexico ◽  
Desert Soils ◽  
Argillic Horizon
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