Light hydrocarbons in gas pockets and sediments of ODP Site 131-808
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| Autori principali: | , |
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| Natura: | Dataset Open Access |
| Lingua: | en |
| Pubblicazione: |
PANGAEA
1993
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| _version_ | 1867167668393476096 |
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| author | Berner, Ulrich Faber, Eckhard |
| author_facet | Berner, Ulrich Faber, Eckhard |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | A suite of gas samples obtained from gas pockets and sediments of the Nankai accretionary prism (Site 808) has been analyzed for their gas composition and carbon and hydrogen isotope ratios. Gases collected from gas pockets between 10 and 555 mbsf consist of CH4 and CO2. Stable carbon isotope ratios of these two components point to a bacterial formation of methane via CO2-reduction that is also supported by D/H ratios of methane. Methane desorbed from sediments by a vacuum/acid treatment is of bacterial and thermal origin. Mixing between these gas types is indicated by molecular composition and carbon isotope ratios. Diagenetic processes at low temperatures can explain ethane to pentane concentrations from 0 to 850 mbsf. Between 850 mbsf and the basaltic basement hydrocarbon occurrences are related to catagenetic processes at elevated temperatures. Thermal alteration of organic matter is reflected through different gas parameters. Propane carbon isotope values of a sample from the zone of the frontal thrust indicate that the gas likely migrated from sediments of a higher maturity into the immature sediments at 366 mbsf. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_785205 |
| institution | PANGAEA |
| language | en |
| publishDate | 1993 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Light hydrocarbons in gas pockets and sediments of ODP Site 131-808 Berner, Ulrich Faber, Eckhard 131-808; 131-808A; 131-808B; 131-808C; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg131; Ocean Drilling Program; ODP; Philippine Sea A suite of gas samples obtained from gas pockets and sediments of the Nankai accretionary prism (Site 808) has been analyzed for their gas composition and carbon and hydrogen isotope ratios. Gases collected from gas pockets between 10 and 555 mbsf consist of CH4 and CO2. Stable carbon isotope ratios of these two components point to a bacterial formation of methane via CO2-reduction that is also supported by D/H ratios of methane. Methane desorbed from sediments by a vacuum/acid treatment is of bacterial and thermal origin. Mixing between these gas types is indicated by molecular composition and carbon isotope ratios. Diagenetic processes at low temperatures can explain ethane to pentane concentrations from 0 to 850 mbsf. Between 850 mbsf and the basaltic basement hydrocarbon occurrences are related to catagenetic processes at elevated temperatures. Thermal alteration of organic matter is reflected through different gas parameters. Propane carbon isotope values of a sample from the zone of the frontal thrust indicate that the gas likely migrated from sediments of a higher maturity into the immature sediments at 366 mbsf. |
| title | Light hydrocarbons in gas pockets and sediments of ODP Site 131-808 |
| topic | 131-808; 131-808A; 131-808B; 131-808C; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Joides Resolution; Leg131; Ocean Drilling Program; ODP; Philippine Sea |
| url | https://doi.org/10.1594/PANGAEA.785205 |