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

conference contribution
posted on 2023-05-23, 18:33 authored by Johnson, SC, Peter McGoldrickPeter McGoldrick, Systra, Y, Sebastien MeffreSebastien Meffre, Ross LargeRoss Large, Raub, TD, Boyce, AJ, Lyons, TW
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.

History

Publication title

Goldschmidt Abstracts

Pagination

1372

Department/School

School of Natural Sciences

Publisher

Cambridge Publications Limited

Place of publication

United Kingdom

Event title

Goldschmidt Conference Abstracts

Event Venue

Yokohama, Japan

Date of Event (Start Date)

2016-06-26

Date of Event (End Date)

2016-07-01

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the earth sciences

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