The Telychian (early Silurian) oxygenation event in northern Europe: A geochemical and magnetic perspective

Hounslow, Mark W. and Ratcliffe, Kenneth T. and Harris, Samuel E. and Nawrocki, Jerzy and Wójcik, Krystian and Montgomery, Paul and Woodcock, Nigel H. (2021) The Telychian (early Silurian) oxygenation event in northern Europe: A geochemical and magnetic perspective. Palaeogeography Palaeoclimatology Palaeoecology. p. 110277. ISSN 0031-0182 DOI (In Press)

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Widespread marine red beds in the European Telychian (lower-Silurian) are one expression of an interval of unusually widespread oxic conditions in low palaeolatitude Silurian seas. This work examines in detail the geochemical and magnetic susceptibility record of cores from southern Poland, which also express the Telychian oxygenation event in grey-mudstones. The geochemical data provide an evaluation of redox conditions, palaeoweathering, sediment provenance, primary palaeoproductivity and upwelling. Sediment provenance is evaluated against possible sources on the East European Craton. The data suggest that the magnetic susceptibility is carried by both paramagnetic Fe-silicates and Fe-oxides. Magnetic data are supplemented by magnetic hysteresis and isothermal remanent magnetisations, and mineralogical data on selected samples. In Poland the oxygenation event is clearly expressed in larger Fe2O3 and magnetic susceptibility, caused by enhanced palaeoweathering, changes in sediment provenance and a redox influence on the preservation of Fe-oxides. A much briefer oxygenation event is detected in the upper Rhuddanian. Palaeoproductivity fluxes indicate that the Telychian oxygenation event was caused by a reduction in primary oceanic palaeoproductivity, possibly linked to a reduction in nutrient delivery to the margin of the East European Craton, inferred to be caused by increased aridity. The increased aridity stimulated enhanced delivery of Fe-enriched aeolian dust from soils, generating a magnetic susceptibility and Fe2O3 expression of the Telychian oxygenation event.

Item Type: Article
Uncontrolled Keywords: 2021AREP; IA77
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title: Palaeogeography Palaeoclimatology Palaeoecology
Page Range: p. 110277
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 02 Mar 2021 15:25
Last Modified: 02 Mar 2021 16:11

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