Comportamento do arsênio em perfis de solos do Sítio Ilha de Terra de Caxiuanã-Pará

Lemos, Vanda Porpino; Costa, Marcondes Lima da; Gurjão, Robson da Silva; Kern, Dirse Clara; Mescouto, Cleide Samara Tavares; Lima, Wivian Thais dos Santos de; Valentim, Taynara Lima

doi:10.1590/s0370-44672009000200004

Cited by 5 publications

(3 citation statements)

References 9 publications

(7 reference statements)

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“…During periods of intense and frequent rainfall, the lower part of the pretic horizon remains saturated for longer and, due to the incorporation of more humid OM at depth in ADE, the microbial activity promotes the reduction of Eh values, which compete for the reduction of iron oxides at the edges of petroplinthite nodules. An increase of reductive dissolution of Fe-oxides with the addition of OM was also reported from other archaeological sites [ 45 ], [ 46 ]. The deferrification of iron nodules in pretic horizons is important for the following: i) hematitic core reduction at the expense of the growing cortex, which explains the presence of concentric nodules; ii) release of Al and Si into the soil matrix, increasing stability of fine kaolinitic material; iii) clay source and; iv) contribution to the xanthization process, increased in humid conditions and in the presence of organic C.…”

Section: Discussionsupporting

confidence: 71%

Pedogenetic processes in anthrosols with pretic horizon (Amazonian Dark Earth) in Central Amazon, Brazil

Macedo

Teixeira²,

Corrêa

et al. 2017

PLoS ONE

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Anthrosols known as Amazonian Dark Earth (ADE) have borne witness to the intensification of sedentary patterns and the demographic increase in Central Amazon. As a result, a recurring pattern has been observed of mounds with ADE arising from domestic activities and the disposal of waste. The objective of this research was to demonstrate the relationship of these anthropic activities with pedogenetic formation processes of ADE in the municipality of Iranduba, Brazil. Disturbed and undisturbed soil samples were taken from two areas of ADE (pretic horizon) and from a non-anthropic pedon. Physical, chemical, micromorphological and SEM-EDS analyses were performed. The coarse material of the pretic horizons consisted predominantly of quartz, iron nodules, ceramics and charcoal fragments, and the fine material is organo-mineral. There was a direct relationship between the color of pretic horizons and the number of charcoal fragments. The thickness of the ADE results from the redistribution of charcoal at depth through bioturbation, transforming subsurface horizons into anthropic horizons. ADE presents granular microaggregates of geochemical and zoogenetic origin. Degradation of iron nodules is intensified in pretic horizons, promoting a reverse pedogenic process contributing to the xanthization process. Surprisingly the anthropic activities also favor clay dispersion and argilluviation; clay coatings on the ceramic fragments and in the pores demonstrate that this is a current process. Processes identified as contributing to ADE genesis included: i) addition of organic residues and ceramic artifacts (cumulization) with the use of fire; ii) mechanical action of humans, roots and macrofauna (bioturbation); iii) melanization of deeper horizons as a result of bioturbation; iv) argilluviation and degradation of iron nodules. This study offers new support to archaeological research in respect to ADE formation processes in Central Amazon and confirmed the hypothesis that ancient anthropic activities may trigger and/or accelerate pedogenetic processes previously credited only to natural causes.

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Section: Discussionsupporting

confidence: 71%

Pedogenetic processes in anthrosols with pretic horizon (Amazonian Dark Earth) in Central Amazon, Brazil

Macedo

Teixeira²,

Corrêa

et al. 2017

PLoS ONE

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“…In relation to organic matter content, the values obtained for the soils studied were greater than 76.31 g kg -1 . These values are higher than those obtained by Lemos et al 20 from areas with ABE in Ilha de Terra site in the Caxiuanã region (PA) and were also higher than values found in the high concentration class, according to Tomé Jr. 21 …”

Section: Organic Matter Content and Phcontrasting

confidence: 66%

Distribution and availability of copper, iron, manganese and zinc in the archaeological black earth profile from the Amazon region

Mescouto¹,

Lemos²,

Filho³

et al. 2011

J. Braz. Chem. Soc.

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Os solos de terra preta arqueológica são ricos em matéria orgânica, contêm fragmentos cerâmicos e artefatos líticos e apresentam nutrientes em concentrações mais elevadas do que outros tipos de solos. Com o intuito de contribuir com informações sobre concentrações de micronutrientes disponíveis em solos de terra preta, foram avaliadas através de extrações químicas sequenciais, a distribuição e disponibilidade de Cu, Fe, Mn e Zn em um perfil de terra preta arqueológica no município de Juruti, estado do Pará. As maiores concentrações de Cu, Fe, Mn e Zn no perfil são encontradas na fração residual. Este estudo mostrou que ferro, manganês e zinco são preferencialmente disponíveis a partir das frações, associados aos óxidos de Fe-Mn, variando de 1265,39 a 1818,12 mg kg The archaeological black earth soils are rich in organic matter, contain ceramic fragments and lithics artifacts and feature nutrients in higher concentrations than other types of soils. To contribute information about micronutrient concentrations available in black earth soils, the distribution and availability of Cu, Fe, Mn and Zn in the archaeological black earth profile from the municipal district of Juruti, Pará State, was evaluated through sequential chemical extractions. The largest concentrations of Cu, Fe, Mn and Zn in the profile are found in the residual fraction. This study showed that the iron, manganese and zinc are preferentially available from the fractions associated with Fe-Mn oxides ranging from 1265.39 to 1818.12 mg kg -1 , 0.83 to 48.51 mg kg -1 and 1.92 to 12.05 mg kg -1 respectively, and the copper from organic matter, ranging from 0.13 to 0.45 mg kg -1 .

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“…Os minerais identificados no perfil de solo com TPA foram o quartzo, caulinita, goethita, hematita, anatásio e illita, equivalente à mineralogia encontrada em outros solos com TPA na região de Caxiuanã (Lemos et al 2009). A albita não faz parte da composição dos solos, porém foi encontrada no horizonte A, oriunda dos artefatos cerâmicos que são abundantes neste horizonte (Figura 1b).…”

Section: Características Mineralógicasunclassified

Mineralogia e geoquímica de perfis de solo com Terra Preta Arqueológica de Bom Jesus do Tocantins, sudeste da Amazônia

et al. 2012

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A comparação de dados morfológicos, mineralógicos e químicos de solo com horizontes antrópicos -Terra Preta Arqueológica (TPA) com Argissolos adjacentes permitiu identificar os principais processos responsáveis pela formação da TPA em um sítio arqueológico no Município de Bom Jesus do Tocantins, sudeste do Estado do Pará. A similaridade entre os dados dos horizontes subsuperficiais do solo com TPA e solos adjacentes indica que o horizonte antrópico do solo TPA foi provavelmente desenvolvido a partir de um horizonte similar aos Argissolos adjacentes com posterior transformação pedogenética através da introdução de materiais orgânicos e inorgânicos por antigas colonizações humanas, resultando no espessamento do horizonte superficial e em concentrações maiores de CaO e P 2 O 5 (teores totais), Zn (teor traço), P e Zn disponível (teores disponíveis), além de Ca e Mg trocáveis (teores trocáveis) em relação aos Argissolos adjacentes. Além disso, essa intervenção antrópica antiga também provocou modificações no horizonte subsuperficial do Argissolo com TPA, como concentrações altas de P 2 O 5 e principalmente P disponível. O Soil Taxonomy e o Sistema Brasileiro de Classificação de Solos (SiBCS) são adequados para a identificação de solo com horizonte antrópico (p.exe. TPA), uma vez que priorizam nas ordens do solo os principais processos pedogenéticos atuantes na formação do solo, relacionados aos horizontes subsuperficiais, além das transformações pedogenéticas posteriores no horizonte superficial. Contudo, este trabalho recomenda o acréscimo de alguns atributos diagnósticos como quantidade de artefatos cerâmicos e líticos, P 2 O 5 , P e Zn disponíveis, C orgânico, Ca 2+ + Mg 2+ (teores trocáveis), CTC e índice de saturação por bases no horizonte superficial para o agrupamento e distinção dos diversos tipos de solos antrópicos antigos da Amazônia. PALAVRAS-CHAVE: Mineralogia, Pré-história, Região Amazônica, Pedologia. Mineralogy and geochemistry of soil profiles with Archeological Black Earth from Bom Jesus do Tocantins, southeastern Amazon ABSTRACTThe comparison of morphological, mineralogical and chemical data of a soil with anthropic horizons -Archeological Black Earth (ABE) and surrounding Argissolos (Typic Kandiudox or Ultisols) allowed the identification of the main process acting on the ABE formation from the town of Bom Jesus do Tocantins, southeastern Pará State. The similarity between the data in the subsurface horizons of ABE and surrounding soils indicates that the former was likely developed from Argissolos with later pedogenetic transformation by the input of organic and inorganic materials from ancient human settlements, which resulted in thickness of the surface horizon and higher concentrations of CaO and P 2 O 5 (total content), Zn (trace content), available P and Zn (available content), and exchangeable Ca and Mg (exchangeable content) compared to surrounding Argissolos. Furthermore, such anthropic disturbance also resulted in changes in the subsurface horizon of Argissolos with ABE, such as high co...

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Comportamento do arsênio em perfis de solos do Sítio Ilha de Terra de Caxiuanã-Pará

Cited by 5 publications

References 9 publications

Pedogenetic processes in anthrosols with pretic horizon (Amazonian Dark Earth) in Central Amazon, Brazil

Pedogenetic processes in anthrosols with pretic horizon (Amazonian Dark Earth) in Central Amazon, Brazil

Distribution and availability of copper, iron, manganese and zinc in the archaeological black earth profile from the Amazon region

Mineralogia e geoquímica de perfis de solo com Terra Preta Arqueológica de Bom Jesus do Tocantins, sudeste da Amazônia

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