Extended Data Fig. 4: Floating astrochronology for the Cenomanian-Turonian boundary interval at IODP Site U1516.
From: Abrupt episode of mid-Cretaceous ocean acidification triggered by massive volcanism
This is based on a short eccentricity bandpass ~100-kyr filter of the cyclic Fe XRF scanning data from Hole U1516D. Squares in right pane show sedimentation rate estimates from the bandpass filter and dashed line shows an average sedimentation rate of 0.8 cm/kyr for the general interval from shipboard nannofossil biostratigraphy26. The unradiogenic Osi excursion marks the onset of LIP volcanism several tens of kiloyear before the initiation of the OAE2 carbon isotope excursion in most conformable sites17,19,20,60,61. The base of the Osi excursion has been dated to 94.55 ± 0.1 Ma17 and ~94.9 Ma62, providing scenarios for absolute numerical age tie points for the Site U1516 record.
