Latimer, Jennifer C. et al. (2006): Glacial-interglacial terrigenous provenance in the southeastern Atlantic Ocean; the importance of deep-water sources and surface currents

Leg/Site/Hole:
ODP 177
ODP 177 1089
ODP 177 1094
Identifier:
2006-058814
georefid

10.1130/G22252.1
doi

Creator:
Latimer, Jennifer C.
University of Michigan, Department of Geological Sciences, Ann Arbor, MI, United States
author

Filippelli, Gabriel M.
Indiana University-Purdue University at Indianapolis, United States
author

Hendy, Ingrid L.
author

Gleason, James D.
author

Blum, Joel D.
author

Identification:
Glacial-interglacial terrigenous provenance in the southeastern Atlantic Ocean; the importance of deep-water sources and surface currents
2006
Geology (Boulder)
Geological Society of America (GSA), Boulder, CO, United States
34
7
545-548
Identifying terrigenous sources in deep-sea sediments may reveal temporal trends in paleocirculation and the relative role of eolian, upwelled, and hemipelagic Fe sources to surface waters. Bulk elemental and isotopic geochemistry of deep-sea sediments recovered during Ocean Drilling Program Leg 177 in the southeastern Atlantic sector of the Southern Ocean reveal several important aspects of paleocirculation and terrigenous provenance. The sites studied span 43 degrees -53 degrees S and represent different oceanographic settings relative to regional hydrography and sediment type. Bulk sediment geochemistry indicates that terrigenous provenance varied over the past 600 k.y. Site 1089, the northernmost site, exhibits clear glacial-interglacial variability in provenance, while provenance appears to vary regardless of climate state at the more southerly sites (Site 1093 and 1094). Nd and Sr isotopes and Sm/Nd ratios of the terrigenous fraction indicate that study sites have geochemically distinguishable provenance. Nd and Sr isotopes further suggest that Sites 1089 and 1094 both contain detrital components that originated in South America over the past 30 k.y.; however, Site 1089 is also influenced by southern African sources and the strength of the Agulhas Current. The epsilon (sub Nd) data support a more hemipelagic source for the terrigenous material rather than an eolian source based on comparisons with Antarctic ice core data and known sea-ice extent.
English
Serial
Coverage:Geographic coordinates:
North:-40.5611
West:5.0749East: 9.5338
South:-53.1049

Quaternary geology; absolute age; Agulhas Current; alkaline earth metals; aluminum; Antarctica; Atlantic Ocean; Cenozoic; chemical ratios; correlation; currents; dates; deep-sea environment; deep-water environment; geochemistry; glacial environment; glaciomarine environment; hemipelagic environment; ice; ice cores; interglacial environment; iron; isotope ratios; isotopes; Leg 177; marine environment; marine sediments; metals; Nd-144/Nd-143; neodymium; ocean currents; Ocean Drilling Program; ODP Site 1089; ODP Site 1094; paleo-oceanography; paleocirculation; provenance; Quaternary; rare earths; sea ice; sediments; Sm/Nd; South Atlantic; Southeast Atlantic; Southern Ocean; Sr-87/Sr-86; stable isotopes; strontium; terrigenous materials; titanium;

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