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Revista Brasileira de Ciência do Solo

versão On-line ISSN 1806-9657

Resumo

LANI, João Luiz et al. Biogenic opals in the identification of lacustrine and marine sediments. Rev. Bras. Ciênc. Solo [online]. 2007, vol.31, n.4, pp.827-832. ISSN 1806-9657.  http://dx.doi.org/10.1590/S0100-06832007000400023.

This study aimed to identify lacustrine or marine sediments based on biogenic opals (also known as spicules). The layers and horizons of a Humic Gley Thiomorphic soil in the Riacho catchment area, Aracruz, state of Espirito Santo, Brazil, were analyzed. Each soil sample was specifically treated to isolate the spicules, which were then identified by an electronic microscope. It was possible to verify the presence of lacustrine as well as marine spicules. Moreover, the shape of the opals provided information on the conditions of the geochemical environment and transport distance of the sediments.

Palavras-chave : environmental indicators; hydromorphic soils; Gleysoils.

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