Egydio Menegotto

TL;DR: In this paper, the vegetal species Ampelozizyphus amazonicus Ducke (Rhamnaceae Family) was chosen as a sampling medium for the lateritic surfaces of the Pitinga Mine in the Amazon region, in order to study the biogeochemical behavior of this species and compare it with the chemical composition of a reference plant.

TL;DR: In this article, the authors investigated the laterization of the Madeira deposit associated with the albite-enriched granite facies of the A-type Madeira granite and obtained many new constraints on the processes that formed the weathering profile from the madeira deposit.

TL;DR: In this article, a few scattered exposures of silicified sedimentary rocks occur in the central Depressao Periferica along the edge of the Parana Basin in Rio Grande do Sul State, southern Brazil.

TL;DR: The relationship between sedimentary rocks and the duricrusts, as well as their probable provenance and genesis, are discussed in this paper, where three types of silicification are recognized: silcretes (SiO 2 >87%), silica rich concretions (Si O 2 from 76.10 % to 86.76% SiO 2 ) and sedimentary sedimentary rock with few silica cement.

TL;DR: In this paper, the presence of crystalline forms of noble metals in dehydrated tissues of Scutia buxifolia (Rhamnaceae), Scoparia montevidensis (Scrophulariaceae) and Adiantopsis cf. chlorophylla (Pteridaceae), a endemic vegetation on ultramafic soils from Pedras Pretas, Sao Sepe, southermost Brazil, was investigated by SEM.