Calcareous nannofossil biostratigraphy and turnover dynamics in the late Campanian-Maastrichtian of the tropical South Atlantic

Online Access: Get full text
doi: 10.1016/j.revmic.2016.01.001
Author(s): Thibault, Nicolas
Author Affiliation(s): Primary:
University of Copenhagen, Department of Geosciences and Natural Resource Management, Copenhagen, Denmark
Volume Title: Revue de Micropaléontologie
Source: Revue de Micropaléontologie, 59(1), p.57-69. Publisher: Elsevier, Paris, France. ISSN: 0035-1598 CODEN: RMCPAM
Note: In English with French summary. 41 refs.; illus., incl. sketch map, 1 table, strat. cols.
Summary: The complete late Campanian-Maastrichtian succession of the South Atlantic reference DSDP Site 525A has been investigated to establish a detailed record of calcareous nannofossil biohorizons. A complete holostratigraphy of the core is presented for this interval and allows for global correlations to other Tethyan and Boreal reference sections for that interval. The new study allows for proposing a new time scale with a tie of Tethyan and Boreal nannofossil zonations. A new subzonation is proposed for the late Campanian UC16 Zone in the Tethyan Realm and the last occurrences of Uniplanarius trifidus and Zeugrhabdotus praesigmoides are demonstrated as markers of the Campanian-Maastrichtian boundary. The difference between cumulative first and last occurrences reflects the turnover dynamics of calcareous nanoplankton in the South Atlantic and highlights 6 major events. Five of them appear well related to major changes in sea-surface temperatures whereas the sixth event is likely the expression of a global decrease in primary productivity in the late Maastrichtian. Surprisingly, the turnover dynamics in calcareous nannoplankton appears completely unrelated to that observed in planktic foraminifera which shows only 4 major events with different timings. The two groups thus seem to have responded either very differently to similar environmental constraints or to different direct environmental constraints in the photic zone, although caused by the same global changes in climate. Abstract Copyright (2016) Elsevier, B.V.
Year of Publication: 2016
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 10 Paleontology, Invertebrate; 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Atlantic Ocean; Biologic evolution; Biostratigraphy; C-13; Campanian; Carbon; Correlation; Cretaceous; DSDP Site 525; Deep Sea Drilling Project; Europe; Exmouth Plateau; Foraminifera; Gubbio Italy; IPOD; Indian Ocean; Isotopes; Italy; Lagerdorf-Kronsmoor-Hemmoor Germany; Leg 122; Leg 74; Maestrichtian; Mesozoic; Microfossils; Nannofossils; ODP Site 762; Ocean Drilling Program; Perugia Italy; Plantae; South Atlantic; Southern Europe; Stable isotopes; Stevns Denmark; Temperature; Tropical environment; Umbria Italy; Uniplanarius trifidus; Upper Cretaceous; Walvis Ridge; Zeugrhabdotus praesigmoides
Coordinates: S290415 S290414 W0025907 W0025908
Record ID: 2018063694
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands