The "Shackleton Site" (IODP Site U1385) on the Iberian Margin

[摘要] Nick Shackleton's research on piston cores from the Iberian marginhighlighted the importance of this region for providing high-fidelityrecords of millennial-scale climate variability, and for correlating climateevents from the marine environment to polar ice cores and Europeanterrestrial sequences. During the Integrated Ocean Drilling Program (IODP) Expedition 339, we sought to extend theIberian margin sediment record by drilling with the D/V JOIDES Resolution. Five holes werecored at Site U1385 using the advanced piston corer (APC) system to amaximum depth of ~155.9 m below sea floor (m b.s.f.).Immediately after the expedition, cores from all holes were analyzed by corescanning X-ray fluorescence (XRF) at 1 cm spatial resolution. Ca/Ti datawere used to accurately correlate from hole-to-hole and construct acomposite spliced section, containing no gaps or disturbed intervals to166.5 m composite depth (mcd). A low-resolution (20 cm sample spacing)oxygen isotope record confirms that Site U1385 contains a continuous recordof hemipelagic sedimentation from the Holocene to 1.43 Ma (Marine IsotopeStage 46). The sediment profile at Site U1385 extends across the middlePleistocene transition (MPT) with sedimentation rates averaging~10 cm kyr⁻¹. Strong precession cycles in colour andelemental XRF signals provide a powerful tool for developing anorbitally tuned reference timescale. Site U1385 is likely to become animportant type section for marine–ice–terrestrial core correlations and thestudy of orbital- and millennial-scale climate variability.

[学科分类] 地质学