Anderson, L. D. and Delaney, M. L. (2005): Use of multiproxy records on the Agulhas Ridge, Southern Ocean (Ocean Drilling Project Leg 177, Site 1090) to investigate sub-Antarctic hydrography from the Oligocene to the early Miocene
Leg/Site/Hole:
Related Expeditions:
ODP 177
Identifier:
ID:
2007-005643
Type:
georefid
ID:
10.1029/2004PA001082
Type:
doi
Creator:
Name:
Anderson, L. D.
Affiliation:
University of California at Santa Cruz, Institute of Marine Sciences, Santa Cruz, CA, United States
Role:
author
Name:
Delaney, M. L.
Affiliation:
Role:
author
Identification:
Title:
Use of multiproxy records on the Agulhas Ridge, Southern Ocean (Ocean Drilling Project Leg 177, Site 1090) to investigate sub-Antarctic hydrography from the Oligocene to the early Miocene
Year:
2005
Source:
Paleoceanography
Publisher:
American Geophysical Union, Washington, DC, United States
Volume:
20
Issue:
3
Pages:
Abstract:
Ocean Drilling Program (ODP) Site 1090, on the Agulhas Ridge in the South Atlantic sector of the Southern Ocean, is ideally located to capture changes in Southern Ocean circulation patterns. Using samples taken from cored sediments, we construct multiproxy records of productivity (biogenic barium (Ba (sub ex) ), opal, and CaCO (sub 3) mass accumulation rates (MARs)), nutrient and organic carbon burial, and redox conditions (U and Mn enrichments) to investigate hydrographic conditions associated with climatic shifts from the Oligocene through the early Miocene. Orbitally induced cyclicity in U and Mn enrichments (100 kyr) suggests shifts in deepwater characteristics. However, CaCO (sub 3) dissolution coincident with low U and Mn enrichments does not indicate low-oxygen, corrosive waters similar to modern conditions. (mod. journ. abst.)
Language:
English
Genre:
Serial
Rights:
URL:
Coverage: Geographic coordinates: North:-42.5449 West:8.5359 East:
8.5359 South:-42.5449
Keywords: Stratigraphy; Isotope geochemistry; actinides; Agulhas Ridge; Antarctic Circumpolar Current; calcium carbonate; Cenozoic; climate forcing; Foraminifera; Invertebrata; isotope ratios; isotopes; Leg 177; manganese; marine environment; metals; microfossils; Miocene; Neogene; O-18/O-16; Ocean Drilling Program; ODP Site 1090; Oligocene; orbital forcing; oxygen; paleo-oceanography; paleoclimatology; paleoenvironment; Paleogene; Protista; Southern Ocean; stable isotopes; Tertiary; uranium;
.