the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Maastrichtian carbon isotope stratigraphy and cyclostratigraphy of the Newfoundland Margin (Site U1403, IODP Leg 342)
Oliver Friedrich
Sietske J. Batenburg
Kazuyoshi Moriya
Silke Voigt
Cécile Cournède
Iris Möbius
Peter Blum
André Bornemann
Jens Fiebig
Takashi Hasegawa
Pincelli M. Hull
Richard D. Norris
Ursula Röhl
Thomas Westerhold
Paul A. Wilson
IODP Expedition
Abstract. Earth’s climate during the Maastrichtian (latest Cretaceous) was punctuated by brief warming and cooling episodes, accompanied by perturbations of the global carbon cycle. Superimposed on a long-term cooling trend, the middle Maastrichtian is characterized by deep-sea warming and relatively high values of stable carbon-isotope ratios, followed by strong climatic variability towards the end of the Cretaceous. A lack of knowledge on the timing of climatic change inhibits our understanding of underlying causal mechanisms. We present an integrated stratigraphy from Site U1403, providing an expanded deep ocean record from the North Atlantic (IODP Expedition 342, Newfoundland Margin). Distinct sedimentary cyclicity suggests that orbital forcing played a major role on depositional processes, which is confirmed by statistical analyses of high resolution elemental data obtained by X-ray fluorescence (XRF) scanning. Astronomical calibration reveals that the investigated interval encompasses seven 405-kyr cycles (Ma4051 to Ma4057) and spans 2.8 Myr directly preceding the Cretaceous/Paleocene (K/Pg) boundary. A high-resolution carbon-isotope record from bulk carbonates allows to identify global trends in the late Maastrichtian carbon cycle. Low-amplitude variations (up to 0.4 ‰), typical for open ocean settings, are compared to the hemipelagic Zumaia section (N-Spain), with a well-established independent cyclostratigraphic framework. Whereas the pre-K/Pg oscillations and the negative values of the Mid-Maastrichtian Event (MME) can be readily discerned in both records, patterns diverge around 67.5 Ma, with Site U1403 more reliably reflecting global climate change. Our new carbon isotope record and the established cyclostratigraphy from Site U1403 may serve as a future reference for detailed studies of late Maastrichtian events in the North Atlantic.
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Oliver Friedrich et al.


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SC1: 'A few comments regarding your contribution', Nicolas Thibault, 20 May 2016
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RC1: 'paleoceanography', Helmut Weissert, 29 Jun 2016
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RC2: 'A timescale for Maastrichtian interval of Site U1430', Anonymous Referee #2, 10 Jul 2016
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RC3: 'Carbon isotope stratigraphy for the late Maastrichtian based on Site U1403', Anonymous Referee #3, 11 Jul 2016
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AC1: 'final response to interactive comments and reviews', Oliver Friedrich, 15 Oct 2016


-
SC1: 'A few comments regarding your contribution', Nicolas Thibault, 20 May 2016
-
RC1: 'paleoceanography', Helmut Weissert, 29 Jun 2016
-
RC2: 'A timescale for Maastrichtian interval of Site U1430', Anonymous Referee #2, 10 Jul 2016
-
RC3: 'Carbon isotope stratigraphy for the late Maastrichtian based on Site U1403', Anonymous Referee #3, 11 Jul 2016
-
AC1: 'final response to interactive comments and reviews', Oliver Friedrich, 15 Oct 2016
Oliver Friedrich et al.
Oliver Friedrich et al.
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Cited
2 citations as recorded by crossref.
- Paleoclimate reconstruction of the Prince Creek Formation, Arctic Alaska, during Maastrichtian global warming S. Salazar-Jaramillo et al. 10.1016/j.palaeo.2019.109265
- Paleoclimate and paleoenvironment reconstruction of paleosols spanning the Lower to Upper Cretaceous from the Rukwa Rift Basin, Tanzania T. Orr et al. 10.1016/j.palaeo.2021.110539