Geochemistry of Peruvian near-surface sediments》.pdf

Geochimica et Cosmochimica Acta, Vol. 68, No. 21, pp. 4429–4451, 2004 Copyright © 2004 Elsevier Ltd Pergamon Printed in the USA. All rights reserved 0016-7037/04 $30.00 .00 doi:10.1016/j.gca.2004.04.027 Geochemistry of Peruvian near-surface sediments PHILIPP BÖNING,1 HANS-JÜRGEN BRUMSACK,1,* MICHAEL E. BÖTTCHER,2 BERNHARD SCHNETGER,1 CORNELIA KRIETE,3 JENS KALLMEYER2,‡ and SVEN LARS BORCHERS 1 1Institute of Chemistry and Biology of the Marine Environment (ICBM), Carl von Ossietzky University of Oldenburg, P.O. Box 2503, D-26111 Oldenburg, Germany 2Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, D-28359 Bremen, Germany 3Federal Institute for Geosciences and Natural Resources (BGR), Stilleweg 2, D-30655 Hannover, Germany (Received May 27, 2003; accepted in revised form April 23, 2004) Abstract—Sixteen short sediment cores were recovered from the upper edge (UEO), within (WO) and below (BO) the oxygen minimum zone (OMZ) off Peru during cruise 147 of R/V Sonne. Solids were analyzed for major/trace elements, total organic carbon, total inorganic carbon, total sulfur, the stable sulfur isotope composition (34S) of pyrite, and sulfate reduction rates (SRR). Pore waters