Geochemical fingerprint—inter-basin chemostratigraphic correlation allowed for a more detailed stratigraphic subdivision of the Pliensbachian–Bathonian strata from the Carpathian Foredeep basement (Ukraine)

Abstract In this study, we combined the geochemical characteristics based on Rock-Eval pyrolysis and gas chromatography – mass spectrometry (GC–MS) results with facies analysis. These surveys were conducted within grey to black claystones/mudstones intervals of Podil’tsi Kokhanivka formations, related Pliensbachian Toarcian–Bathonian ages, respectively. The revealed that Formation contains mixed marine/terrigenous, early-mature mature organic matter. deposition formation took place in dysoxic redox conditions a sulphate-poor marine palaeoenvironment, oxygen scarcity photic zone, as documented by green- brown-pigmented Chlorobiaceae. Oleanane is present samples from Formation, which uncommon Lower Jurassic sedimentary rocks. mostly early-mature, terrestrial matter, deposited suboxic sulphate-poor, fluvial–deltaic palaeoenvironment. absence aliphatic diterpenoids Middle strata points low significance conifers sediment supply area at time. All most formations are characterised poor hydrocarbon potential. Only middle part built brown, organic-rich claystones, shows fair-to-good Based our results, chemostratigraphic correlation Carpathian Foredeep same neighbouring Polish Basin was performed. juxtaposition suggests interval brown can be Middle–Upper Aalenian Age.