A Cenozoic record of the equatorial Pacific carbonate compensation depth


Pälike, Heiko, Lyle, Mitchell W., Nishi, Hiroshi, Raffi, Isabella, Ridgwell, Andy, Gamage, Kusali, Klaus, Adam, Acton, Gary, Anderson, Louise, Backman, Jan, Baldauf, Jack, Beltran, Catherine, Bohaty, Steven M., Bown, Paul, Busch, William, Channell, Jim E. T., Chun, Cecily O.J., Delaney, Margaret, Dewangan, Pawan, Dunkley Jones, Tom, Edgar, Kirsty M., Evans, Helen, Fitch, Peter, Foster, Gavin L., Gussone, Nikolaus, Hasegawa, Hitoshi, Hathorne, Ed C., Hayashi, Hiroki, Herrle, Jens O., Holbourn, Ann, Hovan, Steve, Hyeong, Kiseong, Iijima, Koichi, Ito, Takashi, Kamikuri, Shin-ichi, Kimoto, Katsunori, Kuroda, Junichiro, Leon-Rodriguez, Lizette, Malinverno, Alberto, Moore Jr, Ted C., Murphy, Brandon H., Murphy, Daniel P., Nakamura, Hideto, Ogane, Kaoru, Ohneiser, Christian, Richter, Carl, Robinson, Rebecca, Rohling, Eelco J., Romero, Oscar, Sawada, Ken, Scher, Howie, Schneider, Leah, Sluijs, Appy, Takata, Hiroyuki, Tian, Jun, Tsujimoto, Akira, Wade, Bridget S., Westerhold, Thomas, Wilkens, Roy, Williams, Trevor, Wilson, Paul A., Yamamoto, Yuhji, Yamamoto, Shinya, Yamazaki, Toshitsugu and Zeebe, Richard E. (2012) A Cenozoic record of the equatorial Pacific carbonate compensation depth. Nature, 488, (7413), 609-614. (doi:10.1038/nature11360).

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Description/Abstract

Atmospheric carbon dioxide concentrations and climate are regulated on geological timescales by the balance between carbon input from volcanic and metamorphic outgassing and its removal by weathering feedbacks; these feedbacks involve the erosion of silicate rocks and organic-carbon-bearing rocks. The integrated effect of these processes is reflected in the calcium carbonate compensation depth, which is the oceanic depth at which calcium carbonate is dissolved. Here we present a carbonate accumulation record that covers the past 53 million years from a depth transect in the equatorial Pacific Ocean. The carbonate compensation depth tracks long-term ocean cooling, deepening from 3.0–3.5 kilometres during the early Cenozoic (approximately 55 million years ago) to 4.6 kilometres at present, consistent with an overall Cenozoic increase in weathering. We find large superimposed fluctuations in carbonate compensation depth during the middle and late Eocene. Using Earth system models, we identify changes in weathering and the mode of organic-carbon delivery as two key processes to explain these large-scale Eocene fluctuations of the carbonate compensation depth.

Item Type: Article
ISSNs: 0028-0836 (print)
1476-4687 (electronic)
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
Q Science > QD Chemistry
Q Science > QE Geology
Divisions: Faculty of Natural and Environmental Sciences > Ocean and Earth Science > Geochemistry
Faculty of Natural and Environmental Sciences > Ocean and Earth Science > Palaeoceanography & Palaeoclimate
ePrint ID: 342456
Date Deposited: 30 Aug 2012 09:56
Last Modified: 27 Mar 2014 20:24
Research Funder: NERC
Projects:
Evolution of Carbon Cycle Dynamics (eCCD)
Funded by: NERC (NE/H022554/1)
Led by: Heiko Pälike
15 September 2010 to 28 February 2014
URI: http://eprints.soton.ac.uk/id/eprint/342456

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