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Provedor de dados:  Rev. Bras. Ciênc. Solo
País:  Brazil
Título:  Weathering of Rhyolites and Soil Formation in an Atlantic Forest Fragment in Northeastern Brazil
Autores:  Brilhante,Stephany Alves
Santos,Jean Cheyson Barros dos
Souza Júnior,Valdomiro Severino de
Araújo,Jane Kelly Silva
Ribeiro Filho,Mateus Rosas
Corrêa,Marcelo Metri
Data:  2017-01-01
Ano:  2017
Palavras-chave:  Pedogenesis
Acid crystalline rock
Resumo:  ABSTRACT Weathering and pedogenesis have been studied for a wide range of rocks and climates around the world. However, the eruption of rhyolitic magmas is a rare geological event, which leads to few studies associated with the rhyolite-soil-landscape relationship. In this context, this study evaluated the influence of rhyolite weathering on the properties of soils along a slope in an Atlantic Forest environment in the state of Pernambuco, northeastern Brazil. Four weathering profiles derived from rhyolites were classified and sampled for chemical, physical, mineralogical, micromorphological, differential thermal, and thermogravimetric analyses. The chemical properties reflect the original rock rich in felsic minerals, poor in bases, and the types of clay minerals. The clay fraction of the profiles consists mainly of 1:1 phyllosilicates and oxides, indicating intermediate weathering. However, variations in the degree of structure weathering were evidenced by the presence of partially preserved fragments of the original rock in the sand fraction of the soils. The tropical humid climate of the region influenced conversion of hematite to goethite through the xanthization process, and the subsurface drainage deficiency allowed the formation of halloysite in the lowest position of the landscape. Because it is an acid rock with an aphanitic texture and porphyritic relative size of crystals, rhyolite weathering resulted in the formation of dystrophic soils, with predominance of quartz in the silt fraction. From the top to the lower third of the slope, a Haplic Cambisol, an Abruptic Lixisol, and two Haplic Lixisols were formed.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Editor:  Sociedade Brasileira de Ciência do Solo
Relação:  10.1590/18069657rbcs20160558
Formato:  text/html
Fonte:  Revista Brasileira de Ciência do Solo v.41 2017
Direitos:  info:eu-repo/semantics/openAccess

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