Factors and processes of gibbsite formation in Northern Thailand

Herrmann, Ludger; Anongrak, Niwat; Zarei, Mehdi; Schuler, Ulrich S.; Spohrer, Klaus

doi:10.1016/j.catena.2007.01.007

Cited by 38 publications

(22 citation statements)

References 19 publications

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“…A ausência de Gb no MTf é coerente com o menor grau de intemperismo desse solo (Kämpf e Curi, 2003;Herrmann et al, 2007 Os valores de DMC determinados para esses minerais foram sempre maiores no horizonte subsuperficial dos solos analisados (Quadro 2). Verificou-se clara tendência de o solo mais evoluído (LVwf) apresentar os maiores cristais de Ct e Hm, o que se deve provavelmente às condições ambientais apropriadas (topografia e drenagem) e à menor quantidade de inibidores de cristalização, como a MOS (discutido posteriormente).…”

Section: Resultados E Discussão Teor E Mineralogia Da Fração Argilaunclassified

Influência da Matéria Orgânica no Diâmetro Médio de Minerais da Fração Argila de Solos Desenvolvidos de Basalto no Sul do Brasil

Hanke

Melo

Dieckow

et al. 2015

Rev. Bras. Ciênc. Solo

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resuMO a interação de compostos orgânicos com minerais de argila pode alterar o tamanho dos cristais. no entanto, em solos, esse efeito é ainda pouco claro por causa das limitações na separação de fases puras de minerais para realizar experimentos de dissolução. neste estudo, a relação entre a matéria orgânica do solo (MOs) e diâmetro médio do cristal (dMC) de minerais de argila de horizontes superficiais e subsuperfíciais de solos de uma topossequência no sul do Brasil foi avaliada. Os teores de C e n foram determinados, e a natureza dos grupos funcionais da MOs foi avaliada por espectroscopia de ftIr. O dMC dos minerais foi avaliado por difração de raios X, em umas amostras desferrificadas e outras com óxidos de fe concentrados. Os teores de C e n e as intensidades relativas dos espectros de ftIr foram considerados como variáveis preditoras; e o dMC de hematita, goethita, caulinita e gibbsita, como variáveis preditas. Os teores de C e N e os grupos carboxílicos e C-O-Alquil evidenciaram efeito significativo sobre a variação do DMC. A dimensão dos cristais de óxidos de Fe e de caulinita foi inversamente correlacionada com esses atributos da MOs. em contraste, o DMC de gibbsita não foi influenciado pelos atributos dae MOS. A influência da MOS sobre o DMC dos óxidos de Fe foi atribuída às reações de complexação de superfície e de redox, que promovem um processo contínuo de dissolução-precipitação.Palavras-chave: dissolução, redução, complexação, carboxila, cristal.Recebido para publicação em 8 de outubro de 2014 e aprovado em 15 de julho de 2015.

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Section: Resultados E Discussão Teor E Mineralogia Da Fração Argilaunclassified

Influência da Matéria Orgânica no Diâmetro Médio de Minerais da Fração Argila de Solos Desenvolvidos de Basalto no Sul do Brasil

Hanke

Melo

Dieckow

et al. 2015

Rev. Bras. Ciênc. Solo

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“…Traces of gibbsite are present in the studied soils. Generally, gibbsite has to be suspected as parent materials that weather to a coarse grained saprolite or C horizon allowing free downward drainage and which contain sufficient aluminium like granite and gneiss or other magmatic and metamorphic rocks (Driessen et al, 2001;Herrmann et al, 2007). This is consistent with the presence of gabbro with green amphibole, biotite and plagioclase.…”

Section: Discussionmentioning

confidence: 89%

Genesis and classification of soils developed on gabbro in the high reliefs of Maroua region, North Cameroon

Tsozué

Nzeukou

Azinwi

2017

Eurasian Journal of Soil Science (Ejss)

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Article Info Received : 19.10.2016 Accepted : 15.12.2016 The purpose of this work was to examine the genesis, properties and classification of soils resulting from the weathering of gabbro rock in the high reliefs of Maroua in the Far North Region of Cameroon. The studied soils were ~ 2 m thick, made of four horizons which consisted of coarse saprolite, fine saprolite, loose loamy clayey horizon and humiferous horizon. From petrographical view point, at the bottom of the soil profile, the preservation of the bedrock structure was marked by numerous remnants of altered plagioclases shapes. The groundmass was characterized by a double spaced fine, ranging to equal, enaulic c/f related distribution pattern. It was yellowish, characterized by weakly separated granular microstructure in the fine saprolite and had a speckled and cloudy limpidity in the loose loamy clayey horizon. Secondary minerals consisted of montmorilonite, kaolinite, goethite, quartz, gibbsite, lepidocrocite, sepiolite, feldspar and calcite. Globally, Si/Al ratio ranged between 2.85 and 3.24. The chemical index of alteration ranged from 50.95 to 55.27 % while the mineralogical index of alteration values were between 1.90 and 10.54 %. Physicochemically, soil pH varied from slightly acidic to slightly above neutral. Soil organic carbon contents were low to very low. Exchangeable bases contents were high, mostly represented by Ca 2+ and Mg 2+ . The CEC of soils and the CEC of clay were also high, ranging respectively between 53.68 and 82.88 cmol(+).kg -1 , and 116.80 and 181.38 cmol(+).kg -1 . The studied soils were classified as dystric haplustepts clayey isohyperthermic. They were developed in situ by the collapse of primary mineral structures from the bottom of the coarse saprolite, due to leaching as a result of bisiallitisation and monosiallitisation. This is accompanied by a progressive ferruginization of materials, confirmed by the densification under the microscope of goethitic brown veil from the base to the loamy clay horizon and the increase in iron contents from the bedrock to the humiferous surface horizon.

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“…The rare Ferralsols, formed most probably under the influence of Fe ore, as their occurrence is restricted to the vicinity of small outcrops of hydrothermal Fe ores within the limestone. These Fe ores yielded shares of bayerite (7%), boehmite (4%), diaspore (38%), and gibbsite (16%) (Herrmann et al, 2007;Schuler, 2008). Consequently, radioelement-based soil mapping or soil classification should consider the respective parent rock (material), especially for less developed reference soil groups.…”

Section: Same Reference Soil Groups On Different Parent Materialsmentioning

confidence: 97%

“…However, further developed soils (Acrisols and Ferralsols) were only found on limestone. It can be assumed that the radioelement signature at the Alisol stage of soil formation is already rather independent from parent material, as claystone and limestone residuum showed different mineralogical composition (Herrmann et al, 2007). The rare Ferralsols, formed most probably under the influence of Fe ore, as their occurrence is restricted to the vicinity of small outcrops of hydrothermal Fe ores within the limestone.…”

Section: Same Reference Soil Groups On Different Parent Materialsmentioning

confidence: 99%

A gamma‐ray spectrometry approach to field separation of illuviation‐type WRB reference soil groups in northern Thailand

Schuler

Erbe

Zarei

et al. 2010

Z. Pflanzenernähr. Bodenk.

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According to the World Reference Base for Soil Resources (IUSS Working Group WRB, 2006), the differentiation of Acrisols and Alisols is based on the cation-exchange capacity of clay, which cannot be directly determined in the field, but needs expensive and time-consuming soil-chemical analyses. This is an unsatisfactory situation for pedologists, who urgently require a rapid field method to distinguish illuviation-type reference soil groups (Alisols, Acrisols, Luvisols, Lixisols).In this study, we tested the ability of gamma-ray spectrometry to separate major WRB reference soil groups in the field. The underlying hypothesis is that Alisols and Acrisols are distinguished by their clay mineral composition, which should be reflected by geochemistry and consequently gamma-ray radiation (i.e., K-containing illite vs. K-free kaolinite). Highly significant differences in their gamma-ray spectrum for K, Th, and U were found for limestone and its soils. Especially the K and Th signatures allowed a clear separation of Acrisols and Alisols. In general, the surface radiation was sufficient to separate these soils. Best results were revealed considering parent rock and the whole soil profile. This means by using a portable radiometer and a pH meter, all illuviation-type reference soil groups could be distinguished in this case. If applicable at other sites, this approach could enormously reduce expenditures for soil-chemical analysis needed to assist soil classification.

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Factors and processes of gibbsite formation in Northern Thailand

Cited by 38 publications

References 19 publications

Influência da Matéria Orgânica no Diâmetro Médio de Minerais da Fração Argila de Solos Desenvolvidos de Basalto no Sul do Brasil

Influência da Matéria Orgânica no Diâmetro Médio de Minerais da Fração Argila de Solos Desenvolvidos de Basalto no Sul do Brasil

Genesis and classification of soils developed on gabbro in the high reliefs of Maroua region, North Cameroon

A gamma‐ray spectrometry approach to field separation of illuviation‐type WRB reference soil groups in northern Thailand

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