Changes in palaeoenvironmental conditions during deposition of the Permian Kupferschiefer (Lower Rhine Basin, northwest Germany) inferred from molecular and isotopic compositions of biomarker components

摘要: Abstract Biomarker distributions based on GC and GC-MS data supplemented by stable carbon isotopic compositions irm (isotope ratio monitoring) have been used to investigate changes in depositional conditions a number of samples from 2 m core (Rheinberger Heide) covering the entire deposition Permian Kupferschiefer (Lower Rhine Basin, northwest Germany). Compound classes investigated are aliphatic aromatic hydrocarbons maleimides (1H-pyrrole-2,5-diones). The has previously divided into four sections: TI, TIIA, TIIB TIII lithology. biomarker δ13C values components indicate contributions cyanobacteria, algae, green sulphur bacteria higher plants (minor) throughout deposition. All phytoplanktonic show 13C enrichment lowest section, suggesting greater productivity. occurrence derived (Chlorobiaceae) indicates that was characterised periods photic zone anoxia. Such were rapidly established after initial transgression Zechstein Sea may productivity-driven, but less prevalent during upper sections.