(Table 2) Trace metal ratios of various benthic foraminifera shells ...

• Main Authors: Marchitto, Thomas M, Oppo, Delia W, Curry, William B
• Format: Dataset
• Language: English
• Published: PANGAEA 2002
• Subjects: Event label; Latitude of event; Longitude of event; Elevation of event; DEPTH, sediment/rock; Depth, top/min; Depth, bottom/max; Epoch; Species; Calcium; Zinc/Calcium ratio; Cadmium/Calcium ratio; Manganese/Calcium ratio; Comment; Composite Core; Piston corer; Leg162; CH8X; V28; V29; Joides Resolution; Jean Charcot; Vema; Ocean Drilling Program ODP; Charcot; Southern Ocean; NADW; North Atlantic Deep Water; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.844495; https://doi.pangaea.de/10.1594/PANGAEA.844495

Benthic foraminiferal d13C and Cd/Ca studies suggest that deep Atlantic circulation during the Last Glacial Maximum was very different from today, with high-nutrient (low d13C, high Cd) deep Southern Ocean Water (SOW) penetrating far into the North Atlantic. However, if some glacial d13C values are biased by productivity artifacts and/or air-sea exchange processes, then the existing d13C data may be consistent with the continual dominance of North Atlantic Deep Water (NADW). Cibicidoides wuellerstorfi Cd/Ca results presented here indicate that the glacial North Atlantic was strongly enriched in dissolved Cd below ~2500 m depth. If NADW formation was still vigorous relative to SOW formation, these data could be explained by either increased preformed nutrient levels in the high-latitude North Atlantic or by increased organic matter remineralization within lower NADW. High glacial Zn/Ca values in the same samples, however, are best explained by a substantially increased mixing with Zn-rich SOW. The cause was ... : C. kullenbergi and C. pachyderma Zn/Ca values may all be contaminated, or these species may have very high Zn partition coefficients. ...