Michael Seidel¹, Melina Knoke¹, Jomar S. J. Marques¹, Hannelore Waska¹, Heike Simon¹, Carlos Eduardo Rezende², Andrea Koschinsky³ and Thorsten Dittmar⁴, (1)University of Oldenburg, Oldenburg, Germany, (2)UENF State University of Northern of Rio de Janeiro, Rio De Janeiro, Brazil, (3)Jacobs University Bremen, Department of Physics and Earth Sciences, Bremen, Germany, (4)University of Oldenburg, ICBM-MPI Bridging Group for Marine Geochemistry, Oldenburg, Germany