Faul, K. L. and Delaney, M. L. (2010): A comparison of early Paleogene export productivity and organic carbon burial flux for Maud Rise, Weddell Sea, and Kerguelen Plateau, south Indian Ocean

Leg/Site/Hole:
ODP 113
ODP 119
ODP 113 689
ODP 113 690
ODP 119 738
Identifier:
2013-034372
georefid

10.1029/2009PA001916
doi

Creator:
Faul, K. L.
Mills College, Environmental Sciences Program, Oakland, CA, United States
author

Delaney, M. L.
University of California at Santa Cruz, United States
author

Identification:
A comparison of early Paleogene export productivity and organic carbon burial flux for Maud Rise, Weddell Sea, and Kerguelen Plateau, south Indian Ocean
2010
Paleoceanography
American Geophysical Union, Washington, DC, United States
25
3
Marine biological productivity has been invoked as a possible climate driver during the early Paleogene through its potential influence on atmospheric carbon dioxide concentrations. However, the relationship of export productivity (the flux of organic carbon (C) from the surface ocean to the deep ocean) to organic C burial flux (the flux of organic C from the deep ocean that is buried in marine sediments) is not well understood. We examine the various components involved with atmosphere-to-ocean C transfer by reconstructing early Paleogene carbonate and silica production (using carbonate and silica mass accumulation rates (MARs)); export productivity (using biogenic barium (bio-Ba) MARs); organic C burial flux (using reactive phosphorus (P) MARs); redox conditions (using uranium and manganese contents); and the fraction of organic C buried relative to export productivity (using reactive P to bio-Ba ratios). Our investigations concentrate on Paleocene/Eocene sections of Sites 689/690 from Maud Rise and Site 738 from Kerguelen Plateau. In both regions, export productivity, organic C burial flux, and the fraction of organic C buried relative to export productivity decreased from the Paleocene/early Eocene to the middle Eocene. A shift is indicated from an early Paleogene two-gyre circulation in which nutrients were not efficiently recycled to the surface via upwelling in these regions, to a circulation more like the present day with efficient recycling of nutrients to the surface ocean. Export productivity was enhanced for Kerguelen Plateau relative to Maud Rise throughout the early Paleogene, possibly due to internal waves generated by the plateau regardless of gyre circulation.
English
Serial
Coverage:Geographic coordinates:
North:-62.4232
West:1.1218East: 82.4715
South:-65.0938

Stratigraphy; alkaline earth metals; barium; burial; calcium carbonate; carbon; Cenozoic; chemostratigraphy; cores; Indian Ocean; Kerguelen Plateau; Leg 113; Leg 119; lower Paleogene; marine sediments; Maud Rise; metals; ocean circulation; Ocean Drilling Program; ODP Site 689; ODP Site 690; ODP Site 738; organic carbon; paleo-oceanography; Paleogene; phosphorus; productivity; sedimentation; sedimentation rates; sediments; silica; southern Indian Ocean; Southern Ocean; sulfates; Tertiary; titanium; Weddell Sea;

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