Sedimentology and stable isotope ratios of planktonic foraminifera from two cores off Northeastern Brazil


The stable isotope composition of planktonic foraminifera correlates with evidence for pulses of terrigenous sediment in a sediment core from the upper continental slope off northeastern Brazil. Stable oxygen isotope records of the planktonic foraminiferal species Globigerinoides sacculifer and Globigerinoides ruber (pink) reveal sub-Milankovitch changes in sea-surface hydrography during the last 85,000 yr. Warming of the surface water coincided with terrigenous sedimentation pulses that are inferred from high XRF intensities of Ti and Fe, and which suggest humid conditions in northeast Brazil. These tropical signals correlate with climatic oscillations recorded in Greenland ice cores (Dansgaard-Oeschger cycles) and in sediment cores from the North Atlantic (Heinrich events). Trade winds may have caused changes in the North Brazil Current that altered heat and salt flux into the North Atlantic, thus affecting the growth and decay of the large glacial ice sheets.

Supplement to: Arz, Helge Wolfgang; Pätzold, Jürgen; Wefer, Gerold (1998): Correlated millennial-scale changes in surface hydrography and terrigenous sediment yield inferred from last-glacial marine deposits off northeastern Brazil. Quaternary Research, 50(2), 157-166

Related Identifier
Related Identifier
Metadata Access
Creator Arz, Helge Wolfgang; Pätzold, Jürgen; Wefer, Gerold
Publisher PANGAEA
Publication Year 1998
Rights Creative Commons Attribution 3.0 Unported;
OpenAccess true
Language English
Resource Type Supplementary Publication Series of Datasets; Collection
Format application/zip
Size 7 datasets
Discipline Earth System Research
Spatial Coverage (-37.717 LON, -3.667 LAT); NE-Brazilian continental margin; Northeast Brasilian Margin
Temporal Coverage Begin 1995-03-14T00:00:00Z
Temporal Coverage End 1996-03-30T00:00:00Z