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  • 1
    Electronic Resource
    Electronic Resource
    Geochemical characterization of lithofacies and organic facies in Cretaceous organic-rich rocks from Trinidad, East Venezuela Basin
    Amsterdam : Elsevier
    Organic Geochemistry 22 (1994), S. 441-459,IN1-IN2 
    Details
    ISSN: 0146-6380
    Keywords: Trinidad ; aromatic hydrocarbons ; biomarkers ; major oxides ; multivariate analysis ; organic facies ; petroleum ; source rocks ; thorium/uranium
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0146-6380(94)90118-X
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Triterpenes in a Nigerian oil
    Amsterdam : Elsevier
    Organic Geochemistry 22 (1994), S. 323-329 
    Details
    ISSN: 0146-6380
    Keywords: Niger delta oils ; alkenes ; migration contamination ; oleanenes ; triterpenes
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0146-6380(94)90178-3
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Evidence of structure H hydrate, Gulf of Mexico continental slope
    Amsterdam : Elsevier
    Organic Geochemistry 22 (1994), S. 1029-1032 
    Details
    ISSN: 0146-6380
    Keywords: Gulf of Mexico ; gas chromatograpy ; gas hydrate ; gas vents ; hydrocarbons ; structure H hydrate
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0146-6380(94)90036-1
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Sea floor responses to hydrocarbon seeps, Louisiana continental slope (1990)
    Springer
    Geo-marine letters 10 (1990), S. 232-243 
    Details
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Observations and samples from research submersible dives confirm that brines, crude oil, fluid mud, and gases are common seep products. Through this mechanism a unique interplay of geochemical, geologic, and biological processes resulting in unusual sea floor features ranging from carbonate-rich nodular sediments to mounds with tens of meters relief. Stable carbon isotopes occluded in the carbonates provide a permanent imprint that links these authigenic carbonates to by-products of microbial breakdown of crude oil and gas. Recent DSV ALVIN dives confirm that hydrocarbon seeps and their accompanying chemosynthetic communities and authigenic carbonate mounds occur over the entire depth range of the slope.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02431070
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  • 5
    Electronic Resource
    Electronic Resource
    Organic geochemistry of sediments from chemosynthetic communities, Gulf of Mexico slope (1994)
    Springer
    Geo-marine letters 14 (1994), S. 110-119 
    Details
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract We used a research submersible to obtain 33 sediment samples from chemosynthetic communities at 541–650 m water depths in the Green Canyon (GC) area of the Gulf of Mexico slope. Sediment samples from beneath an isolated mat of H2S-oxidizing bacteria at GC 234 contain oil (mean = 5650 ppm) and C1–C5 hydrocarbons (mean = 12,979 ppm) that are altered by bacterial oxidation. Control cores away from the mat contain lower concentrations of oil (mean = 2966 ppm) and C1–C5 hydrocarbons (mean = 83.6 ppm). Bacterial oxidation of hydrocarbons depletes O2 in sediments and triggers bacterial sulfate reduction to produce the H2S required by the mats. Sediment samples from GC 185 (Bush Hill) contain high concentrations of oil (mean = 24,775 ppm) and C1–C5 hydrocarbons (mean = 11,037 ppm) that are altered by bacterial oxidation. Tube worm communities requiring H2S occur at GC 185 where the sea floor has been greatly modified since the Pleistocene by accumulation of oil, thermogenic gas hydrates, and authigenic carbonate rock. Venting to the water column is suppressed by this sea-floor modification, enhancing bacterial activity in sediments. Sediments from an area with vesicomyid clams (GC 272) contain lower concentrations of oil altered by bacterial oxidation (mean = 1716 ppm) but C1–C5 concentrations are high (mean = 28,766 ppm). In contrast to other sampling areas, a sediment associated with the methanotrophic Seep Mytilid I (GC 233) is characterized by low concentration of oil (82 ppm) but biogenic methane (C1) is present (8829 ppm).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01203722
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  • 6
    Electronic Resource
    Electronic Resource
    Methane Ice Worms: Hesiocaeca methanicola Colonizing Fossil Fuel Reserves (2000)
    Springer
    Naturwissenschaften 87 (2000), S. 184-187 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Notes: Abstract  During a research cruise in July 1997 in the Gulf of Mexico we discovered a gas hydrate approximately 1 m thick and over 2 m in diameter which had recently breached the sea floor at a depth of 540 m. The hydrate surface visible from the submarine was considerably greater than that of any other reported hydrate. Two distinct color bands of hydrate were present in the same mound, and the entire exposed surface of the hydrate was infested (2500 individuals/m2) with 2 to 4 cm-long worms, since described as a new species, Hesiocaeca methanicola, in the polychaete family Hesionidae (Desbruyères and Toulmond 1998). H. methanicola tissue stable isotope values are consistent with a chemoautotrophic food source. No evidence of chemoautotrophic symbionts was detected, but geochemical data support the presence of abundant free living bacteria on the hydrate. The activities of the polychaetes, grazing on the hydrate bacteria and supplying oxygen to their habitats, appears to contribute to the dissolution of hydrates in surface sediments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001140050700
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