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

Abstract

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Supplemental Material: Contribution of orbital forcing and Deccan volcanism to global climatic and biotic changes across the Cretaceous-Paleogene boundary at Zumaia, Spain

“…above the KPB, and the second between 7.1 and 7.9 m (∼520 and 595 k.y.). We suggest that these isotopic events recognized at Zumaia correspond to the LMWE, Dan-C2, and LC29n events reported at Gubbio, Italy (Tethys; Coccioni et al, 2010;Voigt et al, 2012) Quillévéré et al, 2008;Batenburg et al, 2018), and ODP Site 1262 (South Atlantic; Woelders et al, 2017), confirming the global character of these carbon-cycle perturbations (Figs. 1 and 3).…”

A new high-resolution chronology for the late Maastrichtian warming event: Establishing robust temporal links with the onset of Deccan volcanism

“…1; Woelders et al, 2017). A negative bulk δ 18 O excursion of 1‰ has also been resolved from the Newfoundland margin, suggesting that a pronounced surface-water warming also occurred in the mid-northern latitudes during this time, although bulk δ 18 O values cannot reliably be converted into absolute surface-water temperatures (Batenburg et al, 2017). By contrast, there appears to have been very little change in surface-water temperatures at lower latitudes, although this interpretation is tentative based on the availability of only one fine fraction data set from DSDP Site 577 (Fig.…”

“…during the late Maastrichtian event, but was much more rapid, ~10-20 k.y., during Paleogene hyperthermals (e.g., McInerney and Wing, 2011;Zeebe et al, 2017). However, evidence for enhanced deep-sea dissolution during this event has been described from the high latitudes in %CaCO 3 records from ODP Site 690 (Henehan et al, 2016) and in orbitally tuned Fe intensity and magnetic susceptibility data from Integrated Ocean Drilling Program Site U1403 on the Newfoundland margin (Batenburg et al, 2017). These deep-sea sites may have been particularly sensitive to smaller carbon cycle perturbations during this time, with Site 690 located in the principle region of deep-water formation in the Southern Ocean and with Site U1403, at a paleodepth of ~4 km, being more sensitive to smaller fluctuations in the Maastrichtian calcite compensation depth than the shallower Site 1262 (Henehan et al, 2016).…”

Major intensification of Atlantic overturning circulation at the onset of Paleogene greenhouse warmth

“…at 227 m depth rCCSF (corresponding to the first radiation of fasciculithids according to refs. 60 ,] 61 ) and by astronomical tuning of 405 kyr cycles and carbon isotope stratigraphy 62 .…”