Micropedology of alteration in profiles of soils with argillic horizon in the region of Lavras, Minas Gerais

Lacerda, M.P.C.; Andrade, H.; Quemeneur, J.J.G.

Revista Brasileira de Ciencia do Solo 24(4): 829-841


ISSN/ISBN: 0100-0683
Accession: 003498971

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Soil profiles with argillic horizons, occurring on sloping and hilly landscapes, were analysed from the region of Lavras, Minas Gerais, Brazil, in order to investigate changes during soil formation and characteristics related to the parent material. Three profiles formed from geologic material with different chemical composition were selected: red-yellow Argisol developed from granite rocks; red Argisol formed from dioritic rocks; and Argiluvic Chernosol formed from basic rocks of the Greenstone Belt of Lavras. Petrographic analyses of the consolidated and weathered bedrock and micromorphological analyses of the C and BC horizons and solum were undertaken. X-ray diffraction analysis was also used to characterize clay mineralogy. Using the results obtained the relationships between parent material and pedogenetic processes were assessed. The evolution of the alteration processes along the profile were directly linked to the texture, chemical and mineralogical composition of the parent materials.