| _version_ | 1867170456629411840 |
|---|---|
| author | Gingele, Franz Schmieder, Frank von Dobeneck, Tilo Petschick, Rainer Rühlemann, Carsten |
| author_facet | Gingele, Franz Schmieder, Frank von Dobeneck, Tilo Petschick, Rainer Rühlemann, Carsten |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_730524 |
| institution | PANGAEA |
| language | en |
| publishDate | 1999 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Sedimentology of the Rio Grande Rise area Gingele, Franz Schmieder, Frank von Dobeneck, Tilo Petschick, Rainer Rühlemann, Carsten 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 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. |
| title | Sedimentology of the Rio Grande Rise area |
| topic | 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 |
| url | https://doi.org/10.1594/PANGAEA.730524 |