Implicações da dissolução de carbonato de cálcio pelágico para reconstruções paleoceanográficas do Quaternário

Sandro Monticelli Petró, María Alejandra Gómez Pivel, João Carlos Coimbra

Resumo


Reconstruções paleoceanográficas se baseiam fundamentalmente na análise da composição química, florística e faunística de microfósseis. Boa parte destes é de composição calcária, e.g. foraminíferos e cocolitoforídeos. Dado que algumas espécies são mais solúveis que outras, a dissolução age de modo diferencial, alterando os registros originais. A dissolução também pode alterar razões isotópicas e químicas, como o δ18O e Mg/Ca, pois a calcita com alto teor de Mg é mais solúvel que a calcita com baixo teor de Mg. Como resultado, a dissolução do carbonato age de forma a enviesar os proxies paleoceanográficos e, por isso, é importante quantificar a dissolução dos microfósseis antes de iniciar este tipo de estudo. Porém, a dissolução não tem aspectos negativos apenas. Se bem identificada, esta pode ser utilizada como proxy para reconstruções da circulação oceânica e acidificação e mudanças nas propriedades físico-químicas dos oceanos.


Palavras-chave


Foraminíferos; nanofósseis calcários; proxies paleoceanográficos; lisoclina

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Referências


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DOI: http://dx.doi.org/10.5380/abequa.v7i1-2.46419

Quaternary Environmental Geosciences