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Geochemical signatures and weathering rates in soils derived from different granites in contrasting climatic locations Agronomy
Silva, Ygor Jacques Agra Bezerra da; Nascimento, Clístenes Williams Araújo do; Biondi, Caroline Miranda; van Straaten, Peter; Souza Júnior, Valdomiro Severino de; Ferreira, Tiago Osório.
We studied the mineralogical properties and chemical composition of different granites using energy dispersive X-ray spectroscopy coupled with scanning electron microscopy to understand the relationship between granite signatures and soil characteristics, including weathering patterns and soil fertility status. The discriminant analysis (DA) was based on soil physical and chemical properties and was used to differentiate soils developed from I- and S-type granites across contrasting climatic conditions in northeast Brazil. The DA identified the highest values of organic carbon, clay and plant nutrients as key variables to recognize soil profiles derived from I-type granites. In contrast, the greater sand contents and Al saturation distinguished soils...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil science; Soil genesis; Soil fertility; Chemical index of alteration; Northeastern Brazil.; Ciência do Solo.
Ano: 2018 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/39708
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Relationships of †Codoichthys carnavalii Santos, 1994 (Teleostei, Clupeomorpha, †Ellimmichthyiformes) from the Late Aptian of São Luís-Grajaú Basin, NE Brazil Anais da ABC (AABC)
FIGUEIREDO,FRANCISCO J. DE; RIBEIRO,DOUGLAS R.M..
ABSTRACT †Codoichthys carnavalii is a clupeomorph fish only found in calcareous concretions of Codó Formation, State of Maranhão. It is known based on three specimens housed in the paleontological collection of the Museu de Ciências da Terra of Departamento Nacional da Produção Mineral, Rio de Janeiro. It was omitted in most of recent cladistic analyses about clupeomorphs. We revisited its anatomy furnishing new data and additional restorations. Furthermore we explored the relationships of †Codoichthys with the computer program TNT based on a matrix with 30 taxa and 60 unordered and unweight characters. Elops was used to root the tree. The strict consensus was obtained from three shortest trees (L=181; CI=0.387; RI=0.632). The monophyly of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: †Codoichthys; São Luis-Grajaú Basin; Lower Cretaceous; Systematics; Northeastern Brazil..
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000401277
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