Hydrocarbon gases in ODP Leg 104 samples
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PANGAEA
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
1989
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| _version_ | 1867167662882160640 |
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| author | Kvenvolden, Keith A Golan-Bac, Margaret McDonald, Thomas J Pflaum, Ronald C Brooks, James M |
| author_facet | Kvenvolden, Keith A Golan-Bac, Margaret McDonald, Thomas J Pflaum, Ronald C Brooks, James M |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Geochemical studies at three ODP Leg 104 sites on the Wring Plateau help define the distribution of hydrocarbon gases in sediment of this prominent feature of the Norwegian continental margin. Low levels of hydrocarbon gas were encountered in sediment of the outer part of the plateau, but sediment of the inner part of the plateau is very gassy. The molecular composition of inner plateau gases (>99.9% methane) and the carbon isotopic composition of the methane (avg. = -76 per mil relative to the PDB standard) clearly show that the gas is biogenic. Heavier hydrocarbon gases accompany this methane, and their presence is probably a result of both chemical and microbial low-temperature diagenesis. Although these heavier hydrocarbons were not detected in sediment of the outer part of the plateau during shipboard analyses, subsequent shore-based analyses showed that these compounds are present at very low concentrations. Methane in the gassy sediment of the inner part of the plateau may be present as gas hydrates, judging from sedimentological and inorganic geochemical considerations, but no discernible gas hydrates were recovered during drilling. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_736715 |
| institution | PANGAEA |
| language | en |
| publishDate | 1989 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Hydrocarbon gases in ODP Leg 104 samples Kvenvolden, Keith A Golan-Bac, Margaret McDonald, Thomas J Pflaum, Ronald C Brooks, James M 104-642; 104-643A; 104-644; 104-644A; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP Geochemical studies at three ODP Leg 104 sites on the Wring Plateau help define the distribution of hydrocarbon gases in sediment of this prominent feature of the Norwegian continental margin. Low levels of hydrocarbon gas were encountered in sediment of the outer part of the plateau, but sediment of the inner part of the plateau is very gassy. The molecular composition of inner plateau gases (>99.9% methane) and the carbon isotopic composition of the methane (avg. = -76 per mil relative to the PDB standard) clearly show that the gas is biogenic. Heavier hydrocarbon gases accompany this methane, and their presence is probably a result of both chemical and microbial low-temperature diagenesis. Although these heavier hydrocarbons were not detected in sediment of the outer part of the plateau during shipboard analyses, subsequent shore-based analyses showed that these compounds are present at very low concentrations. Methane in the gassy sediment of the inner part of the plateau may be present as gas hydrates, judging from sedimentological and inorganic geochemical considerations, but no discernible gas hydrates were recovered during drilling. |
| title | Hydrocarbon gases in ODP Leg 104 samples |
| topic | 104-642; 104-643A; 104-644; 104-644A; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg104; Norwegian Sea; Ocean Drilling Program; ODP |
| url | https://doi.org/10.1594/PANGAEA.736715 |