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The biological and chemical evolution of the Baltic Sea Basin reflected in changing sulphide geochemistry. Initial results from IODP Exp. 347

Citation

Johnson, SC and McGoldrick, PJ and Hardisty, D and Meffre, S and Large, RR and Noble, T and Olin, P and Dietz, C and Jorgensen, BB and Barker, B and Andren, T, The biological and chemical evolution of the Baltic Sea Basin reflected in changing sulphide geochemistry. Initial results from IODP Exp. 347, Australian Earth Sciences Convention 2016 Book of Abstracts, 26-30 June, Adelaide, pp. 1-2. (2016) [Non Refereed Conference Paper]


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Abstract

The trace element chemistry of anoxic sediments and sedimentary rocks has previously been shown to correlate with the chemistry of the ocean (Algeo., 2004). Recent studies have used the trace element content of ancient sedimentary pyrite to track first order changes in ocean chemistry through geological time and display good parallels with traditional whole-rock methods (Large et al. 2014, 2015). However, no evidence for the possible diagenetic effects on the preservation of the authigenic seawater signal has been presented for this or other methods. Without the preservation of coeval seawater to offer a direct comparison, the possibility of diagenetic overprints requires that sedimentary pyrite analysis and other methods should only be considered semi-quantitative. The recent IODP Exp. 347 "Baltic Sea Paleoenvironment" offered an opportunity to bridge this current knowledge gap by evaluating the formation and chemistry of recent pyrite in a well-constrained context. The Baltic Sea Basin has experienced a varied history in the short time since its formation and has recorded a diverse series of environmental changes. Preserved in the high-resolution stratigraphy recovered during Exp. 347 are several sedimentary units which represent fluxes between a geographically and geochemically restricted water mass, freshwater, and brackish seawater, as well as the development of anoxic water column conditions. Here we present sedimentological results coupled with high-resolution geochemical profiles through the stratigraphy in order to build an integrated understanding of the variations of chemical partitioning within the sediments and to constrain how such observations may relate to changes in the seawater chemistry.

Item Details

Item Type:Non Refereed Conference Paper
Keywords:pyrite, Baltic Sea, IODP 347
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical Oceanography
Objective Division:Environment
Objective Group:Physical and Chemical Conditions of Water
Objective Field:Physical and Chemical Conditions of Water in Marine Environments
Author:Johnson, SC (Mr Sean Johnson)
Author:McGoldrick, PJ (Dr Peter McGoldrick)
Author:Meffre, S (Dr Sebastien Meffre)
Author:Large, RR (Professor Ross Large)
Author:Noble, T (Dr Taryn Noble)
Author:Olin, P (Dr Paul Olin)
Author:Dietz, C (Dr Christian Dietz)
ID Code:115741
Year Published:2016
Deposited By:CODES ARC
Deposited On:2017-04-07
Last Modified:2017-04-13
Downloads:0

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