Hodell, David A; Curtis, Jason H (2008): (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. PANGAEA, https://doi.org/10.1594/PANGAEA.762947, Supplement to: Hodell, DA; Curtis, JH (2008): Oxygen and carbon isotopes of detrital carbonate in North Atlantic Heinrich Events. Marine Geology, 256(1-4), 30-35, https://doi.org/10.1016/j.margeo.2008.09.010
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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.
Median Latitude: 51.463292 * Median Longitude: -36.860156 * South-bound Latitude: 49.877783 * West-bound Longitude: -57.120800 * North-bound Latitude: 58.772200 * East-bound Longitude: -24.238117
Minimum DEPTH, sediment/rock: 0.48 m * Maximum DEPTH, sediment/rock: 8.72 m
303-U1302D * Latitude: 50.166983 * Longitude: -45.638733 * Elevation: -3555.7 m * Recovery: 4.87 m * Campaign: Exp303 (North Atlantic Climate 1) * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 2 cores; 13 m cored; 37.5 % recovered; 0 m drilled; 13 m penetrated
303-U1303B * Latitude: 50.206383 * Longitude: -45.686617 * Elevation: -3517.9 m * Recovery: 71.54 m * Campaign: Exp303 (North Atlantic Climate 1) * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 9 cores; 85.7 m cored; 83.5 % recovered; 0 m drilled; 85.7 m penetrated
|#||Name||Short Name||Unit||Principal Investigator||Method||Comment|
|2||Sample code/label||Sample label||Hodell, David A||ODP sample designation|
|3||Identification||ID||Hodell, David A||detrital carbonate grains|
|5||delta 13C||d13C||per mil PDB||Hodell, David A||Mass spectrometer Finnigan MAT 252||detrital carbonate grains|
|6||delta 18O||d18O||per mil||Hodell, David A||Mass spectrometer Finnigan MAT 252|
|7||Comment||Comment||Hodell, David A||Heinrich layer|
825 data points