Sedimentology of the Rio Grande Rise area

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 f...

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Bibliographic Details
Main Authors: Gingele, Franz, Schmieder, Frank, von Dobeneck, Tilo, Petschick, Rainer, Rühlemann, Carsten
Format: Dataset
Language:English
Published: PANGAEA 1999
Subjects:
Argentine Basin
GeoB
GeoB2110-3
GeoB2821-1
GeoB2822-2
Geosciences
University of Bremen
Gravity corer (Kiel type)
M23/2
M29/2
Meteor (1986)
Rio Grande Rise
SL
Argentine
Mid-Atlantic Ridge
North Atlantic Deep Water
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.730524
https://doi.org/10.1594/PANGAEA.730524
Description
Summary: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.

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