Late Maastrichtian carbon isotope stratigraphy and cyclostratigraphy of the Newfoundland Margin (Site U1403, IODP Leg 342) - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Newsletters on Stratigraphy Année : 2018

Late Maastrichtian carbon isotope stratigraphy and cyclostratigraphy of the Newfoundland Margin (Site U1403, IODP Leg 342)

Sietske J. Batenburg
  • Fonction : Auteur
Oliver Friedrich
  • Fonction : Auteur
Kazuyoshi Moriya
  • Fonction : Auteur
Silke Voigt
  • Fonction : Auteur
Iris Moebius
  • Fonction : Auteur
Peter Blum
  • Fonction : Auteur
Andre Bornemann
  • Fonction : Auteur
Jens Fiebig
  • Fonction : Auteur
Takashi Hasegawa
  • Fonction : Auteur
Pincelli M. Hull
  • Fonction : Auteur
Richard D. Norris
  • Fonction : Auteur
Ursula Roehl
  • Fonction : Auteur
Philip F. Sexton
  • Fonction : Auteur
Thomas Westerhold
  • Fonction : Auteur
Paul A. Wilson
  • Fonction : Auteur
Iodp Expedition 342 Scientists
  • Fonction : Auteur

Résumé

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 Integrated Ocean Drilling Program (IODP) Site U1403, providing an expanded deep ocean record from the North Atlantic (Expedition 342, Newfoundland Margin). Distinct sedimentary cyclicity suggests that orbital forcing played a major role in depositional processes, which is confirmed by statistical analyses of high resolution elemental data obtained by X-ray fluorescence (XRF) core scanning. Astronomical calibration reveals that the investigated interval encompasses seven 405-kyr cycles (Ma(405)1 to Ma(405)7) and spans the 2.8 Myr directly preceding the Cretaceous/Paleocene (K/Pg) boundary. A high-resolution carbon-isotope record from bulk carbonates allows us to identify global trends in the late Maastrichtian carbon cycle. Low-amplitude variations (up to 0.4%) in carbon isotopes at Site U1403 match similar scale variability in records from Tethyan and Pacific open-ocean sites. Comparison between Site U1403 and the hemipelagic restricted basin of the Zumaia section (northern Spain), with its own well-established independent cyclostratigraphic framework, is more complex. Whereas the pre-K/Pg oscillations and the negative values of the Mid-Maastrichtian Event (MME) can be readily discerned in both the Zumaia and U1403 records, patterns diverge during a similar to 1 Myr period in the late Maastrichtian (67.8-66.8 Ma), with Site U1403 more reliably reflecting global carbon cycling. Our new carbon isotope record and cyclostratigraphy offer promise for Site U1403 to serve as a future reference section for high-resolution studies of late Maastrichtian paleoclimatic change.

Dates et versions

hal-01765563 , version 1 (13-04-2018)

Identifiants

Citer

Sietske J. Batenburg, Oliver Friedrich, Kazuyoshi Moriya, Silke Voigt, Cecile Cournede, et al.. Late Maastrichtian carbon isotope stratigraphy and cyclostratigraphy of the Newfoundland Margin (Site U1403, IODP Leg 342). Newsletters on Stratigraphy, 2018, 51 (2), pp.245-260. ⟨10.1127/nos/2017/0398⟩. ⟨hal-01765563⟩
228 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More