10.1594/PANGAEA.712059
Gerhardt, Sabine
Sabine
Gerhardt
Groth, H
H
Groth
Rühlemann, Carsten
Carsten
Rühlemann
Henrich, Rüdiger
Rüdiger
Henrich
Aragonite distribution and preservation of sediment cores from the Brazilian Continental Slope
PANGAEA
2000
Supplementary Publication Series of Datasets
MultiCorer
Gravity corer (Kiel type)
M23/3
Meteor (1986)
South Atlantic in Late Quaternary: Reconstruction of Budget and Currents (SFB261)
2000
en
10.1007/s005310050291
urn:nbn:de:gbv:46-ep000102968
7 datasets
application/zip
Creative Commons Attribution 3.0 Unported
We present late Quaternary records of aragonite preservation determined for sediment cores recovered on the Brazilian Continental Slope (1790-2585 m water depth) where North Atlantic Deep Water (NADW) dominates at present. We have used various indirect dissolution proxies (carbonate content, aragonite/calcite contents, and sand percentages) as well as gastropodal abundances and fragmentation of Limacina inflata to determine the state of aragonite preservation. In addition, microscopic investigations of the dissolution susceptibility of three Limacina species yielded the Limacina Dissolution Index which correlates well with most of the other proxies. Excellent preservation of aragonite was found in the Holocene section, whereas aragonite dissolution gradually increases downcore. This general pattern is attributed to an overall increase in aragonite corrosiveness of pore waters. Overprinted on this early diagenetic trend are high-frequency fluctuations of aragonite preservation, which may be related to climatically induced variations of intermediate water masses.
Supplement to: Gerhardt, Sabine; Groth, H; Rühlemann, Carsten; Henrich, Rüdiger (2000): Aragonite preservation in late Quaternary sediment cores on the Brazilian Continental Slope: implications for intermediate water circulation. International Journal of Earth Sciences, 88(4), 607-618
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Brazil Basin