Nabbefeld, Birgit; Grice, Kliti; Schiummelmann, Arndt; Summons, R E; Troitzsch, Ulrike; Twitchett, Richard J
In this study we compared various maturity dependent aromatic, steroid and triterpenoid hydrocarbon ratios in bitumens that are freely extractable from sedimentary rocks (Bitumen I) with those in second extracts that comprised hydrocarbons closely associated with the kerogen/mineral matrix (Bitumen II). Bitumen II was released through kerogen isolation and demineralisation using HCl and HF/H3BO3. The samples studied, although of similar age, come from different localities. They represent a...[Show more]
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