THE JURASSIC DINOFLAGELLATE CYST PALYNOSTRATIGRAPHY OF THE LUSITANIAN BASIN, PORTUGAL. CONTRIBUTIONS TO PALAEOCEANOGRAPHY OF NORTH ATLANTIC OPENING AND ITS PETROLEUM GEOLOGY

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The effects of the Jenkyns Event on the radiation of Early Jurassic dinoflagellate cysts

Publication . Correia, Vânia; Riding, James; Duarte, L. V.; Fernandes, Paulo; Pereira, Zélia

ABSTRACT: This contribution is an overview of the Early Jurassic dinoflagellate cysts of the Lusitanian Basin in Portugal, with particular emphasis on the effects of the Jenkyns Event (Toarcian Oceanic Anoxic Event) on the evolution of this planktonic group. We review and discuss data from 214 samples from six Lower Jurassic successions (upper Sinemurian to upper Toarcian) in the Lusitanian Basin. The late Pliensbachian radiation of dinoflagellate cysts was well recognized in this basin. The pre-Jenkyns Event interval is highly productive, with maximum abundance and species richness values. However, this palaeoenvironmental perturbation severely affected the evolution of this group for the remainder of the Early Jurassic. The prolonged recovery of the dinoflagellates in the Toarcian following the Jenkyns Event is not typical of the northern regions (Arctic and Boreal realms), where new species began to evolve earlier compared with southern European basins.

2021-03Journal article

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Early and Middle Jurassic palynostratigraphy of the Lusitanian Basin in the proto-Atlantic context

Publication . Correia, Vânia; Pereira, Zélia; Riding, James; Duarte, L. V.; Henriques, Maria Helena; Fernandes, Paulo

SUMMARY: A palinologia é uma ferramenta muito útil nos trabalhos de bioestratigrafia e interpretações paleoambientais, e que pode ser aplicada no conhecimento da geologia da Bacia Lusitânica. Assim, foi desenvolvido um estudo palinoestratigráfico de alta-resolução em 8 cortes do Jurássico Inferior e Médio (Sinemuriano superior—base do Batoniano) da Bacia Lusitânica e, neste trabalho, são apresentados os intervalos de ocorrência e bioeventos associados aos principais taxa identificados, nomeadamente no grupo dos quistos de dinoflagelados.

2023-07Conference object

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