Investigation of the fate of nitrogen in Palaeozoic shales of the Central 
European Basin

Krooss, B. M.; Jurisch, A.; Plessen, Birgit

doi:10.1016/j.gexplo.2005.11.075

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Investigation of the fate of nitrogen in Palaeozoic shales of the Central European Basin

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Krooss, B. M.
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Jurisch, A.
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Plessen, Birgit
5.2 Climate Dynamics and Landscape Evolution, 5.0 Earth Surface Processes, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Krooss, B. M., Jurisch, A., Plessen, B. (2006): Investigation of the fate of nitrogen in Palaeozoic shales of the Central European Basin. - Journal of Geochemical Exploration, 89, 1-3, 191-194.
https://doi.org/10.1016/j.gexplo.2005.11.075

https://gfzpublic.gfz-potsdam.de/pubman/item/item_234303

Abstract

Nitrogen geochemistry of Upper Carboniferous shales from the Central European Basin (CEB) was investigated by elemental analysis, stable isotope mass spectrometry and non-isothermal pyrolysis. Total N-contents of Namurian shales from four deep wells (4400–7000 m) in NE Germany ranged between 520 and 2680 ppm. Up to 90% of this nitrogen occurs as ammonium in minerals with δ15N values between + 1‰ and + 3.5‰. Low nitrogen contents (down to 460 ppm) and high δ15N values (up to + 5.6‰) in one well in the basin centre suggest a large-scale release of nitrogen associated with isotopic fractionation. Pyrolytic liberation of N2 from pelagic Namurian A shales of NW and NE Germany occurred at significantly lower temperatures than from paralic Namurian B shales and terrestrial Westphalian samples. On-line isotope analysis of N2 liberated between 400 and 1200 °C indicates the presence of precursor pools with different thermal stability and nitrogen isotopic composition.