North Atlantic IODP Site 303-U1308 Middle Pleistocene Heinrich Events record ...

• Main Authors: Hodell, David A, Channell, James E T, Curtis, Jason H, Romero, Oscar E, Röhl, Ursula
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2008
• Subjects: Composite Core; Exp303; Joides Resolution; Integrated Ocean Drilling Program / International Ocean Discovery Program IODP; Hudson Strait; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.831743; https://doi.pangaea.de/10.1594/PANGAEA.831743

Heinrich events are well documented for the last glaciation, but little is known about their occurrence in older glacial periods of the Pleistocene. Here we report scanning XRF and bulk carbonate d18O results from Integrated Ocean Drilling Program Site U1308 (reoccupation of Deep Sea Drilling Project Site 609) that are used to develop proxy records of ice-rafted detritus (IRD) for the last ~1.4 Ma. Ca/Sr is used as an indicator of IRD layers that are rich in detrital carbonate (i.e., Heinrich layers), whereas Si/Sr reflects layers that are poor in biogenic carbonate and relatively rich in detrital silicate minerals. A pronounced change occurred in the composition and frequency of IRD at ~640 ka during marine isotope stage (MIS) 16, coinciding with the end of the middle Pleistocene transition. At this time, "Hudson Strait" Heinrich layers suddenly appeared in the sedimentary record of Site U1308, and the dominant period of the Si/Sr proxy shifted from 41 ka prior to 640 ka to 100 ka afterward. The onset of ... : Supplement to: Hodell, David A; Channell, James E T; Curtis, Jason H; Romero, Oscar E; Röhl, Ursula (2008): Onset of 'Hudson Strait' Heinrich Events in the eastern North Atlantic at the end of the middle Pleistocene transition (~640 ka)? Paleoceanography, 23(4), PA4218 ...