Carbon and nitrogen isotopic compositions of alkyl porphyrins from the Triassic Serpiano oil shale
- Univ. of Bristol (United Kingdom)
- Indiana Univ., Bloomington (United States)
The carbon and nitrogen isotopic compositions of seven of the most abundant alkylporphyrins from the Serpiano oil shale (marine, Triassic) were determined. For the C[sub 31] and C[sub 32] butanoporphyrins, values of [delta][sup 13]C[sub PDB] and [delta][sup 15]N[sub AIR] averaged [minus]24.0[per thousand] and [minus]3.1[per thousand]. In contrast, the C[sub 31] and C[sub 32] methylpropanoporphyrins, DPEP, and a C[sub 30] 13-nor etioporphyrin had [delta][sup 13]C and [delta][sup 15]N values averaging [minus]27.5 and [minus]3.3[per thousand], respectively. Carbon and nitrogen isotopic values for kerogen averaged [minus]30.8 and [minus]0.9, whereas those for total extract averaged [minus]31.6, and [minus]4.0[per thousand]. The butanoporphyrins apparently derive from a biological source different from that giving rise to the other porphyrins, their [sup 13]C enrichment not being related to carbon isotopic fractionation accompanying diagenetic reactions. The [delta][sup 15]N values for all the porphyrins indicate that the depletion of [sup 15]N observed in the kerogen is of primary origin. Consistent with the very high abundance of hopanoids and methyl hopanoids in the aliphatic hydrocarbon fraction, it is suggested that cyanobacterial fixation of N[sub 2] may have been the main cause of [sup 15]N depletion. 35 refs., 3 figs., 1 tab.
- OSTI ID:
- 6368407
- Journal Information:
- Geochimica et Cosmochimica Acta; (United States), Vol. 57:6; ISSN 0016-7037
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CARBON 13
QUANTITATIVE CHEMICAL ANALYSIS
NITROGEN 15
OIL SHALES
PORPHYRINS
ORIGIN
CARBON
CYANOBACTERIA
KEROGEN
NITROGEN
BITUMINOUS MATERIALS
CARBON ISOTOPES
CARBONACEOUS MATERIALS
CARBOXYLIC ACIDS
CHEMICAL ANALYSIS
ELEMENTS
ENERGY SOURCES
EVEN-ODD NUCLEI
FOSSIL FUELS
FUELS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
ISOTOPES
LIGHT NUCLEI
MATERIALS
MATTER
MICROORGANISMS
NITROGEN ISOTOPES
NONMETALS
NUCLEI
ODD-EVEN NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC MATTER
ORGANIC NITROGEN COMPOUNDS
ROCKS
SEDIMENTARY ROCKS
SHALES
STABLE ISOTOPES
040500* - Oil Shales & Tar Sands- Properties & Composition