late cretaceous (late campanian–maastrichtian) sea-surface temperature record of the boreal chalk sea
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ID: 177279
2016
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Abstract
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) sea-surface 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 glacio-eustasy as the
potential driver of carbon isotope and climatic variations in the
Maastrichtian.
| Reference Key |
thibault2016climatelate
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|---|---|
| Authors | ;N. Thibault;R. Harlou;N. H. Schovsbo;L. Stemmerik;F. Surlyk |
| Journal | proceedings - 16th ieee/acis international conference on computer and information science, icis 2017 |
| Year | 2016 |
| DOI |
10.5194/cp-12-429-2016
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| URL | |
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