Abstract
Systematic variations in the 13C contents of individual extractable n-alkanes (C 16–C 29) can be modelled quantitatively and interpreted as indicating contributions from at least five distinct sources. These appear to be cyanobacterial ( C 16– C 18, δ 13 C = − 37 0 00 vs PDB ), phytoplanktonic C 16–C 23, δ = −32 0 00 ), chemoautotrophic bacterial ( C 20– C 29, δ = −38 0 00 ), phytoplanktonic or heterotrophic bacterial ( C 20– C 29, δ = −30‰ ), and vascular plants ( C 23– C 29, δ = −29‰ ). Hydrous pyrolysis of related kerogens yields large quantities of additional n-alkanes with different and much more uniform δ values. The latter materials are apparently derived from the thermolysis of aliphatic biopolymers whose presence in the Green River Oil Shale has been recognized visually.
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