Paleoproductivity, nutrient burial, climate change and the carbon cycle in the western equatorial Atlantic across the Eocene/Oligocene boundary

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doi: 10.1029/2002PA000804
Author(s): Nilsen, E. B.; Anderson, L. D.; Delaney, M. L.
Author Affiliation(s): Primary:
University of California at Santa Cruz, Ocean Sciences/Institute of Marine Sciences, Santa Cruz, CA, United States
Volume Title: Paleoceanography
Source: Paleoceanography, 18(3), 11p. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0883-8305 CODEN: POCGEP
Note: In English. 76 refs.; illus., incl. 4 tables
Summary: Paleoproductivity, nutrient burial, and carbon cycling were investigated across the Eocene/Oligocene (E/O) boundary at Ocean Drilling Program Site 925 on the Ceara Rise in the western equatorial Atlantic. Downcore bulk sediment records of biogenic barium, total reactive phosphorus, biogenic silica, and calcium carbonate are interpreted to represent export production, net nutrient burial, biogenic opal production, and inorganic carbon burial, respectively. Biogenic silica production or preservation increased after the Eocene/Oligocene boundary to a higher baseline, although overall productivity and nutrient burial did not increase, based on barium and reactive phosphorus records. (mod. journ. abst.)
Year of Publication: 2003
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; Biochemistry; Biogenic processes; C-13/C-12; Carbon; Carbon cycle; Ceara Rise; Cenozoic; Cores; Eocene; Equatorial Atlantic; Foraminifera; Framework silicates; Geochemical cycle; Geochemistry; Hydrochemistry; Ice; Ice volume; Invertebrata; Isotope ratios; Isotopes; Leg 154; Lower Oligocene; Marine sediments; Microfossils; North Atlantic; Nutrients; O-18/O-16; ODP Site 925; Ocean Drilling Program; Oligocene; Opal; Oxygen; Paleoclimatology; Paleogene; Polar regions; Protista; Sea water; Sediments; Silica minerals; Silicates; Southern Ocean; Stable isotopes; Stratigraphic boundary; Tertiary; Upper Eocene; West Atlantic
Coordinates: N041215 N041216 W0432920 W0432922
Record ID: 2004040720
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