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Trace metals and isotopes in Estonian black shales: Cambro-Ordovician shallow water anoxia on the Baltica shelf?

Citation

Johnson, SC and McGoldrick, PJ and Systra, Y and Meffre, S and Large, RR and Raub, TD and Boyce, AJ and Lyons, TW, Trace metals and isotopes in Estonian black shales: Cambro-Ordovician shallow water anoxia on the Baltica shelf?, Goldschmidt Abstracts, 26 June - 01 July 2016, Yokohama, Japan, pp. 1372. (2016) [Non Refereed Conference Paper]


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Abstract

We present high-resolution whole rock and pyrite geochemical and multi-stable isotopic data for a Cambro-Ordovician shallow-marine black shale sequence in NW Estonia. The magnitude and relative timing (constrained by biostratigraphic framework) of a positive shift in carbon and sulfur isotopes is similar to the SPICE event archived in other settings of this age. Organic-rich shales have elevated levels of bioessential trace elements (Ni, Se, Cu, Zn, Co and Mo) in both pyrite and whole rock samples. We propose these enrichments were a response to periodic, and possibly widespread, water column anoxia. The implications of shallow water anoxia for the deposition of metal-rich shales across the region, and local environmental conditions on the Baltica shelf will be discussed.

Item Details

Item Type:Non Refereed Conference Paper
Keywords:Estonia, black shale, SPICE
Research Division:Earth Sciences
Research Group:Geochemistry
Research Field:Isotope Geochemistry
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Johnson, SC (Mr Sean Johnson)
Author:McGoldrick, PJ (Dr Peter McGoldrick)
Author:Meffre, S (Dr Sebastien Meffre)
Author:Large, RR (Professor Ross Large)
ID Code:115740
Year Published:2016
Deposited By:CODES ARC
Deposited On:2017-04-07
Last Modified:2017-04-11
Downloads:0

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