Data report: Pleistocene planktonic foraminiferal oxygen and carbon stable isotope records and their use to improve the age model of Hole U1436C cores recovered east of the Aogashima Volcano

Abstract

Introduction 3 Material and methods 5 Results 7 Acknowledgments 7 References

One Million Years tephra record at IODP Sites U1436 and U1437: Insights into explosive volcanism from the Japan and Izu arcs

“…Individual tephra ages in Hole U1436A that are calculated based on the shipboard age model (Tamura et al, ) with an average sedimentation rate of 7.2 cm/kyr, reveal ages that are too young in comparison with the dated tephras from Japan. In contrast, the calculated ages derived from the δ 18 O stratigraphy in Hole U1436C (Vautravers et al, ) are a little too old (Figure ). This is particularly significant in the upper 25 mbsf (0–300 ka).…”

“…Shipboard age model after Tamura et al (). Oxygen isotope data for Hole U1436C from Vautravers et al (). The slopes of line segments between tephras correlated to dated Japanese eruptions yield average sediment accumulation rates in cm/kyr.…”

“…The age model of Hole U1437B is based on the stable oxygen isotope stratigraphy established by Mleneck‐Vautravers (Figure S1; Table S2). The stable isotopes were measured on the planktonic foraminifer shells ( Neogloboquadrina dutertrei ) from handpicked specimens in the 250–300 μm size fraction (198 samples within the upper 122 mbsf) in the Godwin Laboratory for Palaeoclimate Research at Cambridge University (additional information is provided in Vautravers et al, ). Forty‐three tie points (Table S2) were used to correlate the δ 18 O record of Site U1437 to the LR04 global reference stack (Lisiecki & Raymo, ) using the AnalySeries 2.0 software of Paillard, Labeyrie, and Yiou ().…”

“…The age model for Hole U1436A is based on the shipboard data (Tamura et al, ) with an average sedimentation rate of 7.2 cm/kyr (Figure ). The marine tephra samples were sampled in Hole U1436A, whereas detailed δ 18 O stratigraphy was established only for Hole U1436C (Vautravers et al, ).…”

“…The robust age models and multiple volcanic events at both sites, provide the opportunity for a high‐resolution, time‐precise record of volcanic activity in the Izu arc. Overall, the excellent biostratigraphic and magnetostratigraphic data (Musgrave & Kars, ; Tamura et al, ; Vautravers et al, ) in Units I–III at Site U1437 demonstrate that the tephra layers represent a time series of instantaneous volcanic events that were preserved within rapidly accumulating tuffaceous mud, and that shows no evidence for hiatuses (Tamura et al, ).…”