Kelly, D. Clay et al. (2005): Enhanced terrestrial weathering/runoff and surface ocean carbonate production during the recovery stages of the Paleocene-Eocene thermal maximum

Leg/Site/Hole:
ODP 113
ODP 113 690
Identifier:
2007-021984
georefid

10.1029/2005PA001163
doi

Creator:
Kelly, D. Clay
University of Wisconsin at Madison, Department of Geology and Geophysics, Madison, WI, United States
author

Zachos, James C.
University of California at Santa Cruz, United States
author

Bralower, Timothy J.
Pennsylvania State University, United States
author

Schellenberg, Stephen A.
San Diego State University, United States
author

Identification:
Enhanced terrestrial weathering/runoff and surface ocean carbonate production during the recovery stages of the Paleocene-Eocene thermal maximum
2005
Paleoceanography
American Geophysical Union, Washington, DC, United States
20
4
PA4023
The carbonate saturation profile of the oceans shoaled markedly during a transient global warming event known as the Paleocene-Eocene thermal maximum (PETM) (circa 55 Ma). The rapid release of large quantities of carbon into the ocean-atmosphere system is believed to have triggered this intense episode of dissolution along with a negative carbon isotope excursion (CIE). The brevity (120-220 kyr) of the PETM reflects the rapid enhancement of negative feedback mechanisms within Earth's exogenic carbon cycle that served the dual function of buffering ocean pH and reducing atmospheric greenhouse gas levels. Detailed study of the PETM stratigraphy from Ocean Drilling Program Site 690 (Weddell Sea) reveals that the CIE recovery period, which postdates the CIE onset by approximately 80 kyr, is represented by an expanded ( approximately 2.5 m thick) interval containing a unique planktic foraminiferal assemblage strongly diluted by coccolithophore carbonate. Collectively, the micropaleontological and sedimentological changes preserved within the CIE recovery interval reflect a transient state when ocean-atmosphere chemistry fostered prolific coccolithophore blooms that suppressed the local lysocline to relatively deeper depths. (mod. journ. abst.)
English
Coverage:Geographic coordinates:
North:-65.0937
West:1.1218East: 1.1218
South:-65.0938

Stratigraphy; Isotope geochemistry; algae; assemblages; C-13/C-12; carbon; Cenozoic; Eocene; Foraminifera; Invertebrata; isotope ratios; isotopes; Leg 113; microfossils; nannofossils; O-18/O-16; Ocean Drilling Program; ODP Site 690; oxygen; Paleocene; Paleocene-Eocene thermal maximum; paleoclimatology; paleoecology; paleoenvironment; Paleogene; Plantae; productivity; Protista; quantitative analysis; runoff; Southern Ocean; stable isotopes; terrestrial environment; Tertiary; weathering; Weddell Sea;

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