Late Cretaceous (late Campanian-Maastrichtian) sea-surface temperature record of the Boreal Chalk Sea

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doi: 10.5194/cp-12-429-2016
Author(s): Thibault, Nicolas; Harlou, Rikke; Schovsbo, Niels H.; Stemmerik, Lars; Surlyk, Finn
Author Affiliation(s): Primary:
University of Copenhagen, Department of Geosciences and Natural Resource Management, Copenhagen, Denmark
Other:
Geological Suvey of Denmark and Greenland, Denmark
Volume Title: Climate of the Past
Source: Climate of the Past, 12(2), p.429-438. Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1814-9324
Note: In English. 60 refs.; illus., incl. sketch map
Summary: The last 8 Myr of the Cretaceous greenhouse interval were characterized by a progressive global cooling with superimposed cool/warm fluctuations. The mechanisms responsible for these climatic fluctuations remain a source of debate that can only be resolved through multi-disciplinary studies and better time constraints. For the first time, we present a record of very high-resolution (ca. 4.5 kyr) seasurface temperature (SST) changes from the Boreal epicontinental Chalk Sea (Stevns-1 core, Denmark), tied to an astronomical timescale of the late Campanian-Maastrichtian (74 to 66 Ma). Well-preserved bulk stable isotope trends and calcareous nannofossil palaeoecological patterns from the fully cored Stevns-1 borehole show marked changes in SSTs. These variations correlate with deep-water records of climate change from the tropical South Atlantic and Pacific oceans but differ greatly from the climate variations of the North Atlantic. We demonstrate that the onset and end of the early Maastrichtian cooling and of the large negative Campanian- Maastrichtian boundary carbon isotope excursion are coincident in the Chalk Sea. The direct link between SSTs and δ13C variations in the Chalk Sea reassesses long-term glacioeustasy as the potential driver of carbon isotope and climatic variations in the Maastrichtian.
Year of Publication: 2016
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Atlantic Ocean; Boreal Realm; Bottom water; C-13/C-12; Campanian; Carbon; Chalk Sea; Climate change; Cores; Cretaceous; DSDP Site 525; Deep Sea Drilling Project; Denmark; Epicontinental seas; Europe; IPOD; Indian Ocean; Indicators; Isotope ratios; Isotopes; Leg 122; Leg 74; Maestrichtian; Marine environment; Mechanism; Mesozoic; Microfossils; Nannofossils; O-18/O-16; ODP Site 762; Ocean Drilling Program; Oxygen; Paleoclimatology; Paleotemperature; Plantae; Scandinavia; Sea-level changes; Sea-surface temperature; South Atlantic; Stable isotopes; Stevns Klint; Stevns-1 Borehole; Upper Cretaceous; Western Europe
Coordinates: S195315 S195314 E1121515 E1121514
S290415 S290414 E0025908 E0025907
Record ID: 2016076596
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