Inorganic geochemical analysis of sediment cores from the Arctic Ocean, POLARSTERN cruise ARK-XXVI/3 (PS78) ...

• Main Author: Meinhardt, Ann-Katrin
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2016
• Subjects: Arctic Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.858561; https://doi.pangaea.de/10.1594/PANGAEA.858561

Dark brown sediment layers are a potential stratigraphic tool in Quaternary Arctic Ocean sediments. They are rich in Mn, Fe, and trace metals scavenged from the water column and were most likely deposited during interglacial intervals. In this study, we combine sediment and pore water data from sediment cores taken in different parts of the Arctic Ocean to investigate the influence of early diagenetic processes on sediment geochemistry. In most studied cores, Mn, Co, and Mo are released into the pore waters from Mn oxide dissolution in deeper (>1.5 m) sediment layers. The relationship between sedimentary Mn, Co, and Mo contents in excess of the lithogenic background (elementxs) shows that Coxs/Moxs values are a diagnostic tool to distinguish between layers with diagenetic metal addition from the pore waters (Coxs/Moxs<1), and layers affected by Mn oxide dissolution and metal release (Coxs/Moxs>10). Steady-state calculations based on current pore water profiles reveal that in the studied cores, the ... : Supplement to: Meinhardt, Ann-Katrin; März, Christian; Schuth, Stephan; Lettmann, Karsten Alexander; Schnetger, Bernhard; Wolff, Joerg-Olaf; Brumsack, Hans-Jürgen (2016): Diagenetic regimes in Arctic Ocean sediments: Implications for sediment geochemistry and core correlation. Geochimica et Cosmochimica Acta, 188, 125-146 ...