Palavras-chave
Isótopos
Oxigênio 18
Proxy
Como Citar
Resumo
Este artigo é uma síntese sobre os principais proxies de paleotemperatura baseados nas carapaças de foraminíferos planctônicos: δ18O, razão Mg/Ca e funções de transferência. Estes organismos unicelulares surgiram no Jurássico. São marinhos, eucariontes, heterótrofos, de hábito planctônico e podem ou não ser portadores de simbiontes fotossintetizantes. Os foraminíferos planctônicos secretam uma carapaça ao longo da vida, composta de calcita; durante sua síntese são incorporados elementos/assinaturas químicas presentes no ambiente, carregando consigo sinais ambientais relacionados às mudanças climáticas, pH e salinidade. As testas têm um excelente potencial de preservação no assoalho oceânico. O uso desses microfósseis, encontrados no registro sedimentar, cria um leque de possibilidades na obtenção de dados paleoceanográficos de várias zonas oceânicas, como o uso em proxies geoquímicos (δ18O, razão Mg/Ca) e nas funções de transferência. A aplicabilidade desses proxies, como também fatores bióticos e abióticos que podem influenciar as estimativas finais, são abordados na revisão.
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