Revised age calibrations for the Eocene/Oligocene boundary of ODP Site 199-1218 ...

• Main Authors: Coxall, Helen, Wilson, Paul A, Pälike, Heiko, Lear, Caroline H, Backman, Jan
• Format: Dataset
• Language: English
• Published: PANGAEA 2005
• Subjects: Datum level; DEPTH, sediment/rock; Age model, optional; Age model; Age, error; Composite Core; Leg199; Joides Resolution; Ocean Drilling Program ODP; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.1594/pangaea.769838; https://doi.pangaea.de/10.1594/PANGAEA.769838

The ocean depth at which the rate of calcium carbonate input from surface waters equals the rate of dissolution is termed the calcite compensation depth. At present, this depth is ~4,500 m, with some variation between and within ocean basins. The calcite compensation depth is linked to ocean acidity, which is in turn linked to atmospheric carbon dioxide concentrations and hence global climate (Broecker and Peng, 1987). Geological records of changes in the calcite compensation depth show a prominent deepening of more than 1 km near the Eocene/Oligocene boundary (~34 million years ago) (van Andel, 1975, doi:10.1016/0012-821X(75)90086-2) when significant permanent ice sheets first appeared on Antarctica (Kennett and Shackleton, 1976, doi:10.1038/260513a0; Miller et al., 1991, doi:10.1029/90JB02015; Zachos et al., 1996, doi:10.1029/96PA00571; Lear et al., 2000, doi:10.1126/science.287.5451.269), but the relationship between these two events is poorly understood. Here we present ocean sediment records of calcium ... : Sediment depth is given in rmcd. Eocene-Oligocene boundary CK95/BKSA95 age = 33,7 Ma, revised to 33,9 Ma for ODP Site 119-1218. ...