Molecular and bulk isotopic analyses of organic matter in marls of the Mulhouse Basin (Tertiary, Alsace, France).

摘要: Contents of 13C in kerogens and carbonates 21 samples from a core the MAX borehole, Mulhouse Evaporite Basin, range -27.3 to -23.5 -3.7 -1.8% vs PDB, respectively. Organic nitrogen same is enriched 15N relative atmospheric N2 by 12.2-15.7%. Hydrogen indices delta values for vary systematically with facies, averaging 493 mg HC/g Corg -25.7% most saline facies (dominated inputs aquatic sources) 267 -23.7% least (50/50 aquatic/terrigenous). Values were measured individual aliphatic hydrocarbons three representing different organic facies. For all samples, terrigenous unusually rich 13C, estimated value bulk debris, apparently derived partly CAM plants, being -22.5%. In isotopic evidence indicates mixing 13C-depleted products photosynthetic bacteria 13C-enriched halotolerant eukaryotic algae. At lower salinities, change producer community marked decrease content algal lipids. The lipids increases due either succession organisms or decreased concentrations dissolved CO2.