Zachos, James C; Röhl, Ursula; Schellenberg, Stephen A; Sluijs, Appy; Hodell, David A; Kelly, Daniel Clay; Thomas, Ellen; Nicolo, Micah J; Raffi, Isabella; Lourens, Lucas Joost; McCarren, H; Kroon, Dick (2005): The Paleocene-Eocene boundary in ODP Leg 208 sites. PANGAEA, https://doi.org/10.1594/PANGAEA.772051, Supplement to: Zachos, JC et al. (2005): Rapid Acidification of the Ocean During the Paleocene-Eocene Thermal Maximum. Science, 308(5728), 1611-1615, https://doi.org/10.1126/science.1109004
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The Paleocene-Eocene thermal maximum (PETM) has been attributed to the rapid release of ~2000 * 10**9 metric tons of carbon in the form of methane. In theory, oxidation and ocean absorption of this carbon should have lowerd deep-sea pH, thereby triggering a rapid (<10,000-year) shoaling of the calcite compensation depth (CCD), followed by gradual recovery. Here we present geochemical data from five new South Atlantic deep-sea sections that constrain the timing and extent of massive sea-floor carbonate dissolution coincident with the PETM. The sections, from between 2.7 and 4.8 kilometers water depth, are marked by a prominent clay layer, the character of which indicates that the CCD shoaled rapidly (<10,000 years) by more than 2 kilometers and recovered gradually (>100,000 years). These findings indicate that a large mass of carbon (>>2000 * 10**9 metric tons of carbon) dissolved in the ocean at the Paleocene-Eocene boundary and that permanent sequestration of this carbon occurred through silicate weathering feedback.
Median Latitude: -27.964370 * Median Longitude: 2.140817 * South-bound Latitude: -28.835017 * West-bound Longitude: 1.577000 * North-bound Latitude: -27.185833 * East-bound Longitude: 2.779630
Date/Time Start: 2003-03-24T00:00:00 * Date/Time End: 2003-04-26T16:45:00
208-1262 * Latitude: -27.185833 * Longitude: 1.577000 * Date/Time Start: 2003-03-24T00:00:00 * Date/Time End: 2003-03-29T00:00:00 * Elevation: -4755.4 m * Penetration: 583.9 m * Recovery: 502.5 m * Location: Walvis Ridge, Southeast Atlantic Ocean * Campaign: Leg208 * Basis: Joides Resolution * Device: Composite Core (COMPCORE) * Comment: 54 cores; 493.9 m cored; 90 m drilled; 101.7 % recovery
208-1262A * Latitude: -27.186000 * Longitude: 1.577000 * Date/Time Start: 2003-03-24T13:00:00 * Date/Time End: 2003-03-26T12:40:00 * Elevation: -4759.0 m * Penetration: 161.5 m * Recovery: 163.53 m * Location: Walvis Ridge, Southeast Atlantic Ocean * Campaign: Leg208 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 17 cores; 161.5 m cored; 0 m drilled; 101.3 % recovery
208-1263 * Latitude: -28.532950 * Longitude: 2.779567 * Date/Time Start: 2003-03-29T00:00:00 * Date/Time End: 2003-04-05T00:00:00 * Elevation: -2717.1 m * Penetration: 1261.5 m * Recovery: 709.5 m * Location: Walvis Ridge, Southeast Atlantic Ocean * Campaign: Leg208 * Basis: Joides Resolution * Device: Composite Core (COMPCORE) * Comment: 93 cores; 777.9 m cored; 483.6 m drilled; 91.2 % recovery