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- W2032878052 abstract "Quarts arenites overlying crystalline basement are fairly common in the geologic record. A modern analog is provided in coastal Brazil where a small tropical lowland is bordered by abrupt, Precambrian granitic and gneissic mountains of the Serra do Mar. Nine different sedimentary environments were sampled, 57 sands were studied petrographically, and 8 complete chemical analyses were made. Here, arkosic river sands pass seaward into well defined, quartz-rich, stranded beach ridges and pure quartz arenites of the modern beach and shelf. Strong inshore wave power combined with tropical weathering seem to be the principal factors for this change. Tropical weathering also converted surface samples of arkosic Pliocene fan deposits into residual quartz arenites. Implications for the paleotectonic and paleoclimatic interpretation of ancient sandstones are also discussed. Arenitos quartzosos recobrindo o embasamento cristalino são comuns no registro geológico. Um exemplo moderno é o da costa brasileira, onde uma pequena baixada tropical é circundada por morros granítico-gnáissicos do Precambriano. Nove ambientes sedimentares diferentes foram analisados, 57 amostras de areias foram estudadas petrograficamente, e 8 análises químicas completas realizadas. Areias fluviais e arcósicas tornam, em direção ao mar, cordões litorâneous (restingas) bem definidos, ricos em quartzo assim como suas praias e plataforma. Forte ação de ondas associada ao intermperismo tropical parece ter sido o principal fator para esta mudança. O intermperismo também as influências paleotechtônicas e (arcósico) do Plioceno em arenitos quartzosos residuais. Discute-se também as influências paleotectônicas e paleoclimáticas na interpretação de arenitos antigos." @default.
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- W2032878052 date "1988-01-01" @default.
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- W2032878052 title "Mineralogic maturity of modern sand along a high-energy tropical coast: Baixada de Jacarepaguá, Rio de Janeiro, Brazil" @default.
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- W2032878052 doi "https://doi.org/10.1016/0895-9811(88)90020-x" @default.
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