Meters composite depth (mcd) versus a relative paleointensity (RPI) proxy (NRM/ARM) from Integrated Ocean Drilling Program (IODP) Site U1306

• Main Authors: Channell, James E T, Wright, James D, Mazaud, Alain, Stoner, Joseph S
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2021
• Subjects: Deep Western Boundary Current; Eirik Drift; North Atlantic; Oxygen isotopes; Quaternary; relative paleointensity; DEPTH, sediment/rock; Natural remanent magnetization/anhysteretic remanent magnetization ratio; Correlation coefficient; Composite Core; Calculated; see Channell et al. 2014; Exp303; Joides Resolution; Greenland
• Online Access: https://dx.doi.org/10.1594/pangaea.926662; https://doi.pangaea.de/10.1594/PANGAEA.926662

The data comprise meters composite depth (mcd) versus a relative paleointensity (RPI) proxy from Integrated Ocean Drilling Program (IODP) Site U1306 drilled on the crest of the Eirik Drift (SW Greenland) in 2272 m water depth. The RPI proxy is natural remanent magnetization (NRM) normalized by anhysteretic remanent magnetization (ARM). The NRM/ARM paleointensity proxy was calculated as a slope over the 20-60 mT peak field demagnetization range. Also listed are the correlation coefficients (r) representing the definition of the slopes. NRM and ARM were measured on a pass-through u-channel magnetometer (see Channell et al., 2014). Planktic oxygen isotope (δ18O) and RPI data are used in tandem to generate an age model for the last 1 Myr from Integrated Ocean Drilling Program (IODP) Site U1306 drilled on the crest of the Eirik Drift (SW Greenland) in 2272 m water depth. For the 1-1.5 Ma interval, the age model is based on RPI alone due to insufficient foraminifera for isotope analyses. Utilizing RPI and δ18O in tandem allows recognition of low-δ18O "events" prior to glacial Terminations I, III, IV, V, VII, VIII, IX and X, that are independently supported by radiocarbon dates through the last deglaciation, and are attributed to local or regional surface-water effects. At Site U1306, Quaternary sedimentation rates (mean ~15 cm/kyr) are elevated during peak glacials and glacial onsets, and are reduced during interglacials, in contrast to the pattern at Site U1305 in 3460 m water depth at the distal toe of the drift, 191 km SW of Site U1306. The contrasting sedimentation-rate pattern appears to hold for the entire ~1.5 Myr record. The slackening and/or shoaling (due to lowered salinity) of the Deep Western Boundary Current (DWBC) during glacial intervals coincided with greater sediment supply to Site U1306 whereas the deepening, and possibly increased vigor, of the DWBC during interglacial intervals boosted sediment supply to Site U1305.