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The expression of the Hangenberg Event (latest Devonian) in a relatively shallow-marine succession (Pomeranian Basin, Poland): the results of a multi-proxy investigation

Published online by Cambridge University Press:  20 August 2014

HANNA MATYJA*
Affiliation:
Polish Geological Institute – National Research Institute, Rakowiecka Str. 4, 00-975 Warszawa, Poland
KATARZYNA SOBIEŃ
Affiliation:
Polish Geological Institute – National Research Institute, Rakowiecka Str. 4, 00-975 Warszawa, Poland
LESZEK MARYNOWSKI
Affiliation:
Faculty of Earth Sciences, University of Silesia, Będzińska Str. 60, 41-200 Sosnowiec, Poland
MARZENA STEMPIEŃ-SAŁEK
Affiliation:
Faculty of Oceanography and Geography, University of Gdańsk, Marszałka Piłsudzkiego Str. 46, 81-378 Gdynia, Poland
KRZYSZTOF MAŁKOWSKI
Affiliation:
Institute of Palaeobiology, Polish Academy of Sciences, Twarda Str. 51/55, 00-818 Warszawa, Poland
*
Author for correspondence: hanna.matyja@pgi.gov.pl

Abstract

The uppermost Famennian – lowermost Tournaisian interval has been analysed in detail using biostratigraphy, sedimentology, magnetic susceptibility and geochemistry in a reference section of the relatively shallow carbonate ramp environment within the Pomeranian Basin. High-resolution biostratigraphic study, based on miospores, allows recognition of the standard western European lepidophyta–nitidus (LN) and verrucosus–incohatus (VI) zones, as well as the Convolutispora major Zone, a local Pomeranian equivalent of the European standard hibernicus–distinctus (HD) Zone. The sedimentary succession and specific phenomena recognized close to the Devonian/Carboniferous boundary, such as fluctuations in water column euxinia, wildfire evidence, relative sea-level changes and perturbations of the carbon cycle reflected by positive carbon excursions, display a pattern partly similar to that observed in many areas in Europe during the Hangenberg Event, although the Hangenberg Black Shale horizon is not developed here. These important microscale environmental perturbations were observed not only within the Famennian LN miospore Zone but in a wide interval between the LN and the lowermost local Convolutispora major miospore zones ( = lower part of HD standard miospore Zone). It is still uncertain whether the recognized event(s) were connected solely with the Hangenberg Event, which was possibly complex and multi-phased as is sometimes suggested, or whether they represent a succession of regionally limited, post-Hangenberg events. This question needs to be further investigated on broader stratigraphic and geographical scales.

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Type
Original Articles
Copyright
Copyright © Cambridge University Press 2014 

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