Carbon isotope analyses of petroleums, modern plant constituents, and other sedimentary
organic materials indicate that the range of C-13/C-12 ratios in organic carbon is about 4.5 …

Data available on stable carbon isotope ratios (C13/C12) are reviewed. It is concluded that
data for modern and ancient natural carbonaceous materials reveal consistently low …

Several studies have shown that the carbon in terrestrial plants is depleted in C" compared
to that in marine plants. This was first reported by Wickman (1952) and Craig (1953). Marine …

Wickman (1952) and Craig (1953) reported that terrestrial plants are in general enriched in
C-12 relative to marine plants. Craig (1953), Landergren (1954), Silverman and Epstein …

AAPG Datapages/Archives: Implications of Carbon Isotopic Composition of Total Organic
Carbon of Some Recent Sediments and Ancient Oils: GEOLOGICAL NOTES Datapages …

Abstract DH and 13 C 12 C ratios were measured for 114 petroleum samples and for several
samples of related organic matter. δD of crude oil ranges from− 85 to− 181‰, except for one …

A histogram of (isotope){13} C values of 621 post-Ordovician marine oils shows a trimodal
distribution. Within this distribution, four groups of oils can be recognized on the basis of …

The carbon isotopic composition of the C 15+ saturate and aromatic hydrocarbon fractions
and the gas chromatographs of the C 15+ saturate fraction of 339 oils were geochemically …

Carbon Isotopes in Petroleum Geochemistry Page 1 Carbon Isotopes in Petroleum
Geochemistry WJ.STAHL 1. Variation of Carbon Isotopes in Kerogen and Petroleum Carbon …

Variations in the 1SC/12C ratio of dissolved and particulate organic matter from several
aquatic systems have been in-vestigated. These measurements were made for natural and …