Amazonian Dark Earths 2003
DOI: 10.1007/1-4020-2597-1_13
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The Use of Micromorphology for the Study of the Formation and Properties of Amazonian Dark Earths

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Cited by 12 publications
(6 citation statements)
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“…In addition, the presence of oval microaggregates, with or without poorly sorted quartz grains and the presence of polyhedral microaggregates (Fig 4D), respectively indicates either biological or geochemical genesis, or strictly geochemical genesis [38]. This microstructure, consisting of a mixture of organo-mineral aggregates with similar structure to the chernic horizon, was identified in other ADE [3], [10], [14]. The subsurface horizons present massive microstructure due to coalescence of microaggregates [38] and the face-to-face arrangement of kaolinitic fine material, with low content of Fe oxides [39].…”
Section: Discussionmentioning
confidence: 82%
See 1 more Smart Citation
“…In addition, the presence of oval microaggregates, with or without poorly sorted quartz grains and the presence of polyhedral microaggregates (Fig 4D), respectively indicates either biological or geochemical genesis, or strictly geochemical genesis [38]. This microstructure, consisting of a mixture of organo-mineral aggregates with similar structure to the chernic horizon, was identified in other ADE [3], [10], [14]. The subsurface horizons present massive microstructure due to coalescence of microaggregates [38] and the face-to-face arrangement of kaolinitic fine material, with low content of Fe oxides [39].…”
Section: Discussionmentioning
confidence: 82%
“…Currently, anthropic addition of organic and inorganic substances allied to the activity of soil fauna is the most accepted model for the formation of ADE [ 9 ], [ 10 ]. In relation to pedogenetic processes, previous studies have shown that darkening of the soil (melanization), resulting from high levels of organic material, pyrogenic carbon and manganese oxides and anthropedoturbation—homogenization of the soil through biological and human action—are important processes for ADE formation occurring in Acrisols at the Hatahara site, Amazônia Central—Brazil [ 3 ], [ 10 ], [ 11 ], [ 12 ], [ 13 ], [ 14 ]. In turn, Acrisols in the region present evidence of argilluviation under natural conditions [ 10 ], demonstrating the clay migration process from the A horizon (eluvial) to the B horizon (illuvial), forming a subsurface textural B horizon (Bt).…”
Section: Introductionmentioning
confidence: 99%
“…Esta técnica ha ayudado a numerosas investigaciones (Araujo et al 2008;Villagran et al 2009;Villagran et al 2010;Villagran et al 2011;Feathers et al 2010;Villagran 2014;Villagran y Giannini 2014;Villagran et al 2017;Lahaye et al 2019) a identificar eventos microestratigráficos, a través del estudio de los procesos de formación del sitio, aportando al análisis físico y químico. Los estudios micromorfológicos desempeñan un papel cada vez más destacado en las investigaciones geoarqueológicas, desde trabajos sobre génesis del suelo y tafonomía, hasta el establecimiento de la naturaleza, el origen y la importancia de los depósitos geogénicos y antrópicos y sus entornos asociados (Courty et al 1989;Macphail y Cruise 2001;Ruivo et al 2004: Villagran 2018.…”
Section: E-issn 2304-4292unclassified
“…Apesar do exposto, alguns de seus atributos que poderiam ajudar a desvendar os processos atuantes em sua gênese, e consequentemente, serem utilizados a fim de se esclarecer o comportamento distinto das TPI, permanecem ainda pouco conhecidos, especialmente os micromorfológicos. Estudos micromorfológicos em TPI (RUIVO et al, 2003) demonstraram que a presença de visíveis materiais orgânicos carbonizados sugerem primeiramente combustão incompleta e posterior deposição e impregnação do fundo matricial, que é possível em decorrência da elevada intercomunicação de poros devido a elevada bioturbação. Esse fato também foi constatado por Lima et al (2010), que observaram que o horizonte A antrópico apresentou estrutura típica de horizonte A chernozêmico, mostrando agregados organo-minerais, em uma mistura de materiais do horizonte A com agregados minerais dos horizontes subsuperficiais.…”
Section: Introductionunclassified