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Respostas do microplâncton marinho durante os Eventos Anóxicos Oceânicos (OAEs) do Cretáceo.

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Title: Respostas do microplâncton marinho durante os Eventos Anóxicos Oceânicos (OAEs) do Cretáceo. (Portuguese)
Alternate Title: Marine microplankton responses during the Cretaceous Oceanic Anoxic Events (OAEs). (English)
Authors: Rodrigues Bruno, Mauro Daniel, De Jesus Francisco Tungo, Edna, Luft-Souza, Fernanda, Sander, Victória Herder, Fauth, Gerson
Source: Geologia USP: Série Científica; jun2025, Vol. 25 Issue 2, p3-32, 30p
Subject Terms: CRETACEOUS Period, FOSSIL microorganisms, ANOXIC waters, BIOGEOCHEMICAL cycles, PALEOGEOGRAPHY, ANALYTICAL geochemistry, BIOLOGICAL evolution, MARINE phytoplankton
Abstract (English): Microfossils are essential components of sedimentary rocks deposited during the Cretaceous Period, providing insights to characterize Oceanic Anoxic Events (OAEs). This study aims to identify and systematize the responses of marine microplankton to OAEs during the Cretaceous based on published literature. Marine microfossils respond to OAEs through evolutionary events, preservation, and variations in abundance and diversity of the assemblages. Additionally, they export significant concentrations of chemical elements to the seafloor, impacting the global climate. Changes in the orbital cycles and large-scale paleogeographic and volcanic events are considered the main causes that promoted significant changes in Mesozoic ecosystems, resulting in the geological processes that characterize OAEs. The analysis of eight Cretaceous OAEs enables the characterization of the geochemical signals and the responses of marine microplankton to each event. Marine microfossils, especially calcareous nannofossils, radiolarians, and foraminifers, play a crucial role in the planet's biogeochemical cycles, and their evolution is closely linked to the OAEs. Further studies using material collected from the South Atlantic Ocean are necessary to better understand the impacts of OAEs on the evolution of marine biota. [ABSTRACT FROM AUTHOR]
Abstract (Portuguese): Os microfósseis desempenham um papel vital como componentes das rochas sedimentares depositadas durante o Cretáceo, fornecendo informações para a caracterização dos Eventos Anóxicos Oceânicos (OAEs). Esse estudo visa identificar e sistematizar as respostas do microplâncton marinho aos OAEs do Cretáceo, por meio da literatura publicada. Os microfósseis marinhos respondem aos OAEs por meio de eventos evolutivos, variações preservacionais, nas abundâncias e diversidade das associações. Além disso, esses organismos exportam concentrações significativas de elementos químicos para o fundo marinho, impactando o clima global. Mudanças nos ciclos orbitais do planeta e eventos paleogeográficos e vulcânicos de grande escala são considerados as principais causas que promoveram mudanças significativas nos ecossistemas do Mesozoico, resultando nos processos geológicos que caracterizam os OAEs. Ao analisar os oito OAEs do Cretáceo foi possível caracterizar as respostas geoquímicas e do microplâncton marinho para cada OAE. Por meio desse estudo é possível inferir que cada OAE possui características únicas, amplitude específica no tempo geológico, distintos fatores causais e impactos específicos sobre a biota marinha. Os microfósseis marinhos, em especial os nanofósseis calcários, radiolários e foraminíferos representam um importante componente para os ciclos biogeoquímicos do planeta e sua evolução está intimamente relacionada aos OAEs. Estudos adicionais, com materiais do Oceano Atlântico Sul, são necessários para melhor compreender os impactos dos OAEs na evolução da biota marinha. [ABSTRACT FROM AUTHOR]
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Database: Complementary Index
Description
Abstract:Microfossils are essential components of sedimentary rocks deposited during the Cretaceous Period, providing insights to characterize Oceanic Anoxic Events (OAEs). This study aims to identify and systematize the responses of marine microplankton to OAEs during the Cretaceous based on published literature. Marine microfossils respond to OAEs through evolutionary events, preservation, and variations in abundance and diversity of the assemblages. Additionally, they export significant concentrations of chemical elements to the seafloor, impacting the global climate. Changes in the orbital cycles and large-scale paleogeographic and volcanic events are considered the main causes that promoted significant changes in Mesozoic ecosystems, resulting in the geological processes that characterize OAEs. The analysis of eight Cretaceous OAEs enables the characterization of the geochemical signals and the responses of marine microplankton to each event. Marine microfossils, especially calcareous nannofossils, radiolarians, and foraminifers, play a crucial role in the planet's biogeochemical cycles, and their evolution is closely linked to the OAEs. Further studies using material collected from the South Atlantic Ocean are necessary to better understand the impacts of OAEs on the evolution of marine biota. [ABSTRACT FROM AUTHOR]
ISSN:1519874X
DOI:10.11606/issn.2316-9095.v25-227385