Sulphur,organic carbon and iron relationships in estuarine and freshwater sediments: effects of sedimentation rate |
| |
| Institution: | 1. Department of Earth Sciences, ETH Zürich, Sonnegstrasse 5, 8092, Zürich, Switzerland;2. Biology and Paleo Environment, Lamont Doherty Earth Observatory, 61 Route 9W, Palisades, NY, 10964, USA;3. Department of Marine and Coastal Sciences, Rutgers University, 71 Dudley Road, New Brunswick, NJ, 08901-8560, USA;4. Institute of Environmental Science and Technology, Universidad Autonoma de Barcelona, Bellaterra, Spain;5. Catalan Institution for Research and Advanced Studies (ICREA), Pg. Lluís Companys 23, Barcelona 08010, Spain;1. School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, 1000 Pope Road, MSB 629, Honolulu, HI 96822, USA;2. Ocean and Earth Science, University of Southampton, European Way, Southampton SO14 3ZH, UK;1. GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, 24148 Kiel, Germany;2. Nordic Center for Earth Evolution, Department of Biology, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark;3. Zoological Institute, Christian-Albrechts-University of Kiel, 24098 Kiel, Germany |
| |
| Abstract: | Concentrations of S, organic C and Fe were investigated in profiles of sediments from two estuarine systems in the SW of Western Australia. In marine-affected sediments, inorganic S dominates total S and concentrations of total S correlate with Fe and not with organic C. In freshwater sediments, organic S dominates total S and concentrations of total S correlate with organic C and not with Fe. Molar Fe/S ratios in the estuarine sediments decrease with increasing salinity and approach unity for marine conditions. Net accumulation rates of S in sediments were estimated with a numerical computer model, calibrated with published data on profiles of marine sediments for diffusion of SO2?4, sedimentation rates and distributions of S. Measured depth-integrated reduction rates of SO2?4 in the marine-affected estuarine sediments approach those obtained for Fe-limited marine conditions at similar rates of sedimentation. Measured concentrations of inorganic S in anoxic freshwater sediments fit a numerically calculated relationship between inorganic S and sedimentation rate. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
