(Appendix A) Geochemistry of Oligocene sediments of ODP Site 177-1090 ...

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 (B...

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Bibliographic Details
Main Authors: Anderson, Linda Davis, Delaney, Margaret Lois
Format: Dataset
Language:English
Published: PANGAEA 2005
Subjects:
Event label
Sample code/label
DEPTH, sediment/rock
Depth, composite
AGE
Manganese
Barium
Uranium
Titanium
Aluminium
Method comment
Barium excess
Calcium carbonate
Opal, biogenic silica
Velocity, shear, amplitude
Phosphorus, reactive
Phosphorus, detrital
Phosphorus, total
Accumulation rate, phosphorus
Accumulation rate, barium, excess
Accumulation rate, calcium carbonate
Accumulation rate, opal
Accumulation rate, terrigenous
Drilling/drill rig
DSDP/ODP/IODP sample designation
Leg177
Joides Resolution
Antarc*
Antarctic
Southern Ocean
Online Access:https://dx.doi.org/10.1594/pangaea.838992
https://doi.pangaea.de/10.1594/PANGAEA.838992
Description
Summary: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 (Baex), opal, and CaCO3 mass accumulation rates (MARs)), nutrient and organic carbon burial (reactive phosphorus (Pr) MARs), 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, CaCO3 dissolution coincident with low U and Mn enrichments does not indicate low-oxygen, corrosive waters similar to modern conditions. These observations indicate that a well-developed "modern-type" Antarctic Circumpolar Current (ACC) did not yet exist over the period from 30 to 20 Ma, with two potential consequences: ... : Supplement to: Anderson, Linda Davis; Delaney, Margaret Lois (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. Paleoceanography, 20(3), PA3011 ...

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