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Gerhardt, Sabine; Groth, H; Rühlemann, Carsten; Henrich, Rüdiger (2000): Aragonite distribution and preservation of sediment cores from the Brazilian Continental Slope. PANGAEA, https://doi.org/10.1594/PANGAEA.712059, Supplement to: Gerhardt, S et al. (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, https://doi.org/10.1007/s005310050291

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Abstract:
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.
Related to:
Gerhardt, Sabine (2001): Late Quaternary water mass variability derived from the pteropod preservation state in sediments of the western South Atlantic Ocean and the Caribbean Sea. Berichte aus dem Fachbereich Geowissenschaften der Universität Bremen, 171, 109 pp, urn:nbn:de:gbv:46-ep000102968
Coverage:
Median Latitude: -8.601190 * Median Longitude: -34.146905 * South-bound Latitude: -8.735000 * West-bound Longitude: -34.345000 * North-bound Latitude: -8.528333 * East-bound Longitude: -34.021667
Date/Time Start: 1993-03-22T00:00:00 * Date/Time End: 1993-03-23T00:00:00
Event(s):
GeoB2204-1 * Latitude: -8.531667 * Longitude: -34.023333 * Date/Time: 1993-03-22T00:00:00 * Elevation: -2080.0 m * Recovery: 0.43 m * Location: Brazil Basin * Campaign: M23/3 * Basis: Meteor (1986) * Device: MultiCorer (MUC) * Comment: core recovery 10/10; pteropods at surface
GeoB2204-2 * Latitude: -8.528333 * Longitude: -34.021667 * Date/Time: 1993-03-22T00:00:00 * Elevation: -2072.0 m * Recovery: 8.97 m * Location: Brazil Basin * Campaign: M23/3 * Basis: Meteor (1986) * Device: Gravity corer (Kiel type) (SL) * Comment: weight on top of sediment
GeoB2205-4 * Latitude: -8.573333 * Longitude: -34.345000 * Date/Time: 1993-03-22T00:00:00 * Elevation: -1790.0 m * Recovery: 0.45 m * Location: Brazil Basin * Campaign: M23/3 * Basis: Meteor (1986) * Device: MultiCorer (MUC) * Comment: core recovery 10/10
Size:
7 datasets

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