Sedimentology of the Rio Grande Rise area

DOI

Surface sediment samples and three gravity cores from the eastern terrace of the Vema Channel, the western flank of the Rio Grande Rise, and the Brazilian continental slope were investigated for physical properties, grain size, and clay mineral composition. Discharge of the Rio Doce is responsible for kaolinite enrichments on the slope south of 20° and at intermediate depths of the Rio Grande Rise. The long-distance advection of kaolinite with North Atlantic Deep Water from lower latitudes is of minor importance as evidenced by low kaolinite/chlorite ratios on the Mid-Atlantic Ridge. Cyclic variations of kaolinite/chlorite ratios in all our cores, with maxima in interglacials, are attributed to low-and high-latitude forcing of paleoclimate on the Brazilian mainland and the related discharge of the Rio Doce. A long-term trend toward more arid and 'glacial' conditions from 1500 ka to present is superimposed on the glacial-interglacial cyclicity.

Supplement to: Gingele, Franz; Schmieder, Frank; von Dobeneck, Tilo; Petschick, Rainer; Rühlemann, Carsten (1999): Terrigenous flux in the Rio Grande Rise area during the last 1.5 Ma: evidence of deepwater advection or rapid response to continental rainfall patterns. Paleoceanography, 14(1), 84-95

Identifier
DOI https://doi.org/10.1594/PANGAEA.730524
Related Identifier https://doi.org/10.1029/1998PA900012
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.730524
Provenance
Creator Gingele, Franz; Schmieder, Frank; von Dobeneck, Tilo ORCID logo; Petschick, Rainer; Rühlemann, Carsten
Publisher PANGAEA
Publication Year 1999
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Language English
Resource Type Supplementary Publication Series of Datasets; Collection
Format application/zip
Size 6 datasets
Discipline Geosciences; Natural Sciences
Spatial Coverage (-45.520W, -30.452S, -38.802E, -28.648N); Argentine Basin; Rio Grande Rise
Temporal Coverage Begin 1993-03-05T00:00:00Z
Temporal Coverage End 1994-07-30T00:00:00Z