Stable isotopes and XRF data over the Paleocene-Eocene Thermal Maximum from IODP Sites U1403 and U1409 ...

• Main Authors: Penman, Donald E, Kirtland Turner, Sandra, Sexton, Philip F, Norris, Richard D, Dickson, Alexander J, Boulila, Slah, Ridgwell, Andy, Zeebe, Richard E, Zachos, James C, Cameron, Adele, Westerhold, Thomas, Röhl, Ursula
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2016
• Subjects: Integrated Ocean Drilling Program / International Ocean Discovery Program IODP; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.860498; https://doi.pangaea.de/10.1594/PANGAEA.860498

During the Paleocene-Eocene Thermal Maximum (PETM) about 56 million years ago, thousands of petagrams of carbon were released into the atmosphere and ocean in just a few thousand years, followed by a gradual sequestration over approximately 200,000 years. If silicate weathering is one of the key negative feedbacks that removed this carbon, a period of seawater calcium carbonate saturation greater than pre-event levels is expected during the event's recovery phase. In marine sediments, this should be recorded as a temporary deepening of the depth below which no calcite is preserved - the calcite compensation depth (CCD). Previous and new sedimentary records from sites that were above the pre-PETM calcite compensation depth show enhanced carbonate accumulation following the PETM. A new record from an abyssal site in the North Atlantic that lay below the pre-PETM calcite compensation depth shows a period of carbonate preservation beginning about 70,000 years after the onset of the PETM, providing the first ... : Supplement to: Penman, Donald E; Kirtland Turner, Sandra; Sexton, Philip F; Norris, Richard D; Dickson, Alexander J; Boulila, Slah; Ridgwell, Andy; Zeebe, Richard E; Zachos, James C; Cameron, Adele; Westerhold, Thomas; Röhl, Ursula (2016): An abyssal carbonate compensation depth overshoot in the aftermath of the Paleocene-Eocene Thermal Maximum. Nature Geoscience, 9, 575-580 ...