Article Dans Une Revue Revue de Micropaléontologie Année : 2025

Dispersal and diversity dynamics of the early Valanginian to late Aptian cosmopolitan benthic foraminifera in time and space

Résumé

A database containing palaeobiogeographical distribution information of fifty species and one subspecies of benthic foraminifera has been created for the early Valanginian to late Aptian interval. The information on the data was collected from published documents. The selected taxa occur in the northern and southern hemispheres. They mainly include infaunal and calcareous taxa. Biodiversity dynamics are interpreted together with sea-level curves, summarized data of seafloor spreading rates and Carbon Isotope Excursions (CIEs), including the Weissert, Faraoni and Selli events. The broad distribution of benthic foraminifera indicates connection between the Gulf of Mexico and the Tethyan, Atlantic, Pacific and Indian Oceans during the Early Cretaceous. In addition, the results demonstrate a large dispersal and high diversity of the studied foraminifera throughout the Weissert event (late Valanginian-early Hauterivian), which may be related to elevated rates of sea-level rise, mean seafloor spreading and crustal production at spreading ridges, as well as increased ridge length, weathering and nutrient fluxes. This is followed by marked stepwise declines in diversity despite continued long-term sea-level rise and possible increase in the connectivity of different basins. Such declines were probably caused by a series of Early Cretaceous severe anoxic events such as the Faraoni and Selli OAEs (Oceanic Anoxic Events).

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hal-05548103 , version 1 (11-03-2026)

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Masoumeh Gheiasvand, Christian Vérard, Hossein Mosaddegh, Gérard Stampfli, Valentin Rineau. Dispersal and diversity dynamics of the early Valanginian to late Aptian cosmopolitan benthic foraminifera in time and space. Revue de Micropaléontologie, 2025, 89, pp.100879. ⟨10.1016/j.revmic.2025.100879⟩. ⟨hal-05548103⟩
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