The late Maastrichtian nannofossil record of climate change in the South Atlantic DSDP Hole 525A

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doi: 10.1016/j.marmicro.2007.07.004
Author(s): Thibault, Nicolas; Gardin, Silvia
Author Affiliation(s): Primary:
Université Pierre et Marie Curie-Paris VI, Laboratoire de Micropaléontologie, Paris, France
Volume Title: Marine Micropaleontology
Source: Marine Micropaleontology, 65(3-4), p.163-184. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0377-8398 CODEN: MAMIDH
Note: In English. Includes appendix. 104 refs.; illus., incl. charts, 3 tables, sketch map
Summary: The phytoplankton response (calcareous nannofossils) to the Late Maastrichtian climate evolution is investigated in the South Atlantic DSDP Hole 525A and compared to published geochemical and micropaleontological data. The results point to a succession of dramatic climatic fluctuations. "Cool-water indicators" (Ahmuellerella octoradiata, Kamptnerius magnificus and Nephrolithus frequens) suggest cool surface water conditions prevailed during Chron C30n. At the top of C30n, their sudden drop in abundance, the last occurrence of B. constans and the concomitant increase in the tropical species Micula murus suggest warming and lower surface water productivity. An M. murus acme within Chron C29r reflects maximum warming. During the last 100 kyr of the Maastrichtian, the decrease in M. murus and increase in cool-water indicators reflect rapid cooling with the cool climate persisting over. The calcareous nannoplankton response to climate change correlate with similar findings in the Equatorial Atlantic Hole 1258A and parallels the stable isotope record of planktic and benthic foraminifera of DSDP Hole 525A as well as the decline in 187Os/188Os. Comparison of this marine record and the continental climate record in North America suggests a link between Deccan volcanism and the late Maastrichtian warm event. Abstract Copyright (2007) Elsevier, B.V.
Year of Publication: 2007
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 10 Paleontology, Invertebrate; 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Assemblages; Atlantic Ocean; Benthic taxa; Biostratigraphy; Ceratolithoides; Climate change; Cooling; Cretaceous; DSDP Site 525; Deep Sea Drilling Project; Eiffellithus; Foraminifera; IPOD; Invertebrata; Isotope ratios; Isotopes; Leg 74; Maestrichtian; Marine environment; Mesozoic; Metals; Microfossils; Microrhabdulus; Nannofossils; Os-188/Os-187; Osmium; Paleoecology; Planktonic taxa; Plantae; Platinum group; Prediscosphaera; Protista; Retecapsa; Senonian; South Atlantic; Stable isotopes; Upper Cretaceous; Upper Maestrichtian; Walvis Ridge; Zeugrhabdotus
Coordinates: S290415 S290414 E0025908 E0025907
Record ID: 2008075765
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands