(Appendix A) Oxygen and carbon isotope results of detrital carbonate grains of Heinrich layers from HU90-013-028 and IODP Sites 303-U1302/U1303/U1308 in the North Atlantic Ocean, supplement to: Hodell, David A; Curtis, Jason H (2008): Oxygen and carbon isotopes of detrital carbonate in North Atlantic Heinrich Events. Marine Geology, 256(1-4), 30-35

• Main Authors: Hodell, David A, Curtis, Jason H
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2008
• Subjects: Event label; Sample code/label; Identification; DEPTH, sediment/rock; δ13C; δ18O; Comment; Drilling/drill rig; Piston corer; DSDP/ODP/IODP sample designation; Mass spectrometer Finnigan MAT 252; Exp303; HUD90/13; Joides Resolution; Hudson; Integrated Ocean Drilling Program / International Ocean Discovery Program IODP; Canada; Labrador Sea; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.762947; https://doi.pangaea.de/10.1594/PANGAEA.762947

We report oxygen and carbon isotope results of detrital carbonate grains from Heinrich layers at three sites in the North Atlantic located along a transect from the Labrador Sea to the eastern North Atlantic. Oxygen isotopic values of individual detrital carbonate grains from six Heinrich layers at all sites average - 5.6 ppm ± 1.5 ppm (1sigma; n = 166), reflecting values of dolomitic limestone derived from source areas in northeastern Canada. The d18O of bulk carbonate at Integrated Ocean Drilling Program (IODP) Site U1308 (re-occupation of Deep Sea Drilling Project (DSDP) Site 609) in the eastern North Atlantic records the proportion of detrital to biogenic carbonate and d18O decreases to - 5 ppm during Heinrich (H) events 1, 2, 4 and 5 relative to a background value of ~ 1 to 2 ppm for biogenic carbonate. Bulk d18O also decreases during H3 and H6 but only attains values of - 1ppm, indicating either a greater proportion of biogenic-to-detrital carbonate or a different source. Because the d18O of detrital carbonate is ~ 9 ppm lower than foraminifer carbonate, any fine-grained detrital carbonate not removed from the inner test chambers will lower foraminifer d18O. We conclude bulk carbonate d18O is a sensitive proxy for detrital carbonate and may be useful for identifying Heinrich layers in cores within and near the margins of the North Atlantic ice-rafted detritus (IRD) belt.