Not logged in
Data Publisher for Earth & Environmental Science

Henkel, Susann; Mogollón, José M; Nöthen, Kerstin; Franke, Christine; Bogus, Kara; Robin, Eric; Bahr, André; Blumenberg, Martin; Pape, Thomas; Seifert, Richard; März, Christian; de Lange, Gert Jan; Kasten, Sabine (2012): Sediment and pore water chemistry of cores 214 and 755 recovered during Meteor M72/1 and POSEIDON cruise POS317/2, northwestern Black Sea. doi:10.1594/PANGAEA.779906,
Supplement to: Henkel, S et al. (2012): Diagenetic barium cycling in Black Sea sediments - A case study for anoxic marine environments. Geochimica et Cosmochimica Acta, 88, 88-105, doi:10.1016/j.gca.2012.04.021

Always quote above citation when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

High-resolution sedimentary records of major and minor elements (Al, Ba, Ca, Sr, Ti), total organic carbon (TOC), and profiles of pore water constituents (SO42-, CH4, Ca2+, Ba2+, Mg2+, alkalinity) were obtained for two gravity cores (core 755, 501 m water depth and core 214, 1686 m water depth) from the northwestern Black Sea. The records were examined in order to gain insight into the cycling of Ba in anoxic marine sediments characterized by a shallow sulfate-methane transition (SMT) as well as the applicability of barite as a primary productivity proxy in such a setting. The Ba records are strongly overprinted by diagenetic barite (BaSO4) precipitation and remobilization; authigenic Ba enrichments were found at both sites at and slightly above the current SMT. Transport reaction modeling was applied to simulate the migration of the SMT during the changing geochemical conditions after the Holocene seawater intrusion into the Black Sea. Based on this, sediment intervals affected by diagenetic Ba redistribution were identified. Results reveal that the intense overprint of Ba and Baxs (Ba excess above detrital average) strongly limits its correlation to primary productivity. These findings have implications for other modern and ancient anoxic basins, such as sections covering the Oceanic Anoxic Events for which Ba is frequently used as a primary productivity indicator. Our study also demonstrates the limitations concerning the use of Baxs as a tracer for downward migrations of the SMT: due to high sedimentation rates at the investigated sites, diagenetic barite fronts are buried below the SMT within a relatively short period. Thus, 'relict' barite fronts would only be preserved for a few thousands of years, if at all.
Related to:
Blumenberg, Martin; Seifert, Richard; Kasten, Sabine; Bahlmann, Enno; Michaelis, Walter (2009): Euphotic zone bacterioplankton sources major bacteriohopanepolyols in the Holocene Black Sea. Geochimica et Cosmochimica Acta, 73(3), 750-766, doi:10.1016/j.gca.2008.11.005
Median Latitude: 44.568600 * Median Longitude: 32.441400 * South-bound Latitude: 44.401700 * West-bound Longitude: 32.028300 * North-bound Latitude: 44.735500 * East-bound Longitude: 32.854500
Date/Time Start: 2004-09-01T00:00:00 * Date/Time End: 2007-02-10T00:00:00
M72/1-214 * Latitude: 44.401700 * Longitude: 32.854500 * Date/Time: 2007-02-10T00:00:00 * Elevation: -1686.0 m * Recovery: 4.12 m * Location: Black Sea * Campaign: M72/1 * Basis: Meteor (1986) * Device: Gravity corer (GC) * Comment: Pore water sampling by rhizons.
PO317/2-755 * Latitude: 44.735500 * Longitude: 32.028300 * Date/Time: 2004-09-01T00:00:00 * Elevation: -501.0 m * Recovery: 5.74 m * Location: Black Sea * Device: Gravity corer (GC) * Comment: Pore water sampling by squeezer method.
4 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text (use the following character encoding: )