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Thirty-five different samples from three different sulfur cycles were examined in this stratigraphically oriented study of the Shell 22x-1 well (U.S.G.S. C177 core) in the Piceance Basin, Colorado. Carbon isotopic compositions of constituents of Green River bitumens indicate mixing of three main components: products of primary photoautotrophs and their immediate consumers (? ?30? vs PDB), products of methanotrophic bacteria (? ?85?), and products of unknown bacteria (? ?40?). For individual compounds synthesized by primary producers, ?-values ranged from ?28 to ?32?. 13C contents of individual primary products (?-carotene, steranes, acyclic isoprenoids, tricyclic triterpenoids) were not closely correlated, suggesting...
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Carbon isotopic compositions of saturated hydrocarbon, aromatic hydrocarbon, NSO (resin), and asphaltene fractions of vein-forming gilsonites (Cowboy, Bonanza, Independence, Wagonhound and Harrison veins) in the NE Uinta Basin, Utah, are all similar and isotopically resemble Mahogany Zone shale extracts of the Green River Formation (δ 13C −29 to −31%). Individual molecular fossils in the gilsonites show a wider variability in compositions indicative of their paleoecological origins within the Eocene Uinta/Greater Green River paleolake system. Carbon isotopic compositions of C28 and C29 steranes (δ 13C = −25 to −32%), pristance and phytane (−33 to —34%) and perhydroβ-carotene (carotane) (δ 13C = −33.2%) suggest that...
    map background search result map search result map Carbon isotopic composition of individual biomarkers in gilsonites (Utah) Carbon isotopic composition of individual biomarkers in gilsonites (Utah)