caa a22 4500 475827945 CHVBK 20180406123833.0 cr unu---uuuuu 170329e20000301xx s 000 0 eng 10.1007/s005310050291 doi (NATIONALLICENCE)springer-10.1007/s005310050291 Aragonite preservation in late Quaternary sediment cores on the Brazilian Continental Slope: implications for intermediate water circulation [Elektronische Daten] [S. Gerhardt, H. Groth, C. Rühlemann, R. Henrich] 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. Springer-Verlag Berlin Heidelberg, 2000 Key words Pteropods nationallicence Aragonite preservation nationallicence South Atlantic nationallicence Brazilian Continental Slope nationallicence North Atlantic Deep Water nationallicence Antarctic Intermediate Water nationallicence Gerhardt S. Fachbereich Geowissenschaften, Universität Bremen, Postfach 330440, D-28334 Bremen, Germany Tel.: +49-0421-2187135 Fax: +49-0421-2187431 e-mail: sgerhardt@mail.sedpal.uni-bremen.de, DE aut Groth H. Fachbereich Geowissenschaften, Universität Bremen, Postfach 330440, D-28334 Bremen, Germany Tel.: +49-0421-2187135 Fax: +49-0421-2187431 e-mail: sgerhardt@mail.sedpal.uni-bremen.de, DE aut Rühlemann C. Fachbereich Geowissenschaften, Universität Bremen, Postfach 330440, D-28334 Bremen, Germany Tel.: +49-0421-2187135 Fax: +49-0421-2187431 e-mail: sgerhardt@mail.sedpal.uni-bremen.de, DE aut Henrich R. Fachbereich Geowissenschaften, Universität Bremen, Postfach 330440, D-28334 Bremen, Germany Tel.: +49-0421-2187135 Fax: +49-0421-2187431 e-mail: sgerhardt@mail.sedpal.uni-bremen.de, DE aut https://doi.org/10.1007/s005310050291 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s005310050291 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gerhardt S. Fachbereich Geowissenschaften, Universität Bremen, Postfach 330440, D-28334 Bremen, Germany Tel.: +49-0421-2187135 Fax: +49-0421-2187431 e-mail: sgerhardt@mail.sedpal.uni-bremen.de, DE aut NATIONALLICENCE 700 1- Groth H. Fachbereich Geowissenschaften, Universität Bremen, Postfach 330440, D-28334 Bremen, Germany Tel.: +49-0421-2187135 Fax: +49-0421-2187431 e-mail: sgerhardt@mail.sedpal.uni-bremen.de, DE aut NATIONALLICENCE 700 1- Rühlemann C. Fachbereich Geowissenschaften, Universität Bremen, Postfach 330440, D-28334 Bremen, Germany Tel.: +49-0421-2187135 Fax: +49-0421-2187431 e-mail: sgerhardt@mail.sedpal.uni-bremen.de, DE aut NATIONALLICENCE 700 1- Henrich R. Fachbereich Geowissenschaften, Universität Bremen, Postfach 330440, D-28334 Bremen, Germany Tel.: +49-0421-2187135 Fax: +49-0421-2187431 e-mail: sgerhardt@mail.sedpal.uni-bremen.de, DE aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer