(Table 1) Concentrations and carbon isotopic compositions of CH4 and CO2 at DSDP Site 76-533
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
1983
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| _version_ | 1867170029130219520 |
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| author | Galimov, Erik M Kvenvolden, Keith A |
| author_facet | Galimov, Erik M Kvenvolden, Keith A |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The principal gaseous carbon-containing components identified in the first 400 m of sediment at Deep Sea Drilling Project Site 533, Leg 76, are methane (CH4) and carbon dioxide (CO2). Below a sub-bottom depth of about 25 m, sediment cores commonly contained pockets caused by the expansion of gas upon core recovery. The carbon isotopic composition (d13C per mil relative to PDB standard) of CH4 and CO2 in these gas pockets has been measured, resulting in the following observations: (1) d13C-CH4 values increase with depth from approximately -94 per mil in the uppermost sediment to about -66 per mil in the deepest sediment, reflecting a systematic but nonlinear depletion of 12C with depth. (2) d13C-CO2 values also increase with depth of sediment from about -25 per mil to about -4 per mil, snowing a depletion of 12C that closely parallels the trend of the isotopic composition of CH4. The magnitude and parallel distribution of d13C values for both CH4 and CO2 are consistent with the concept that the formation of the CH4 resulted from the microbiological reduction of CO2 from organic substances. These results imply that CH4 and CO2 incorporated in gas hydrates at this site are biogenic. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_809823 |
| institution | PANGAEA |
| language | en |
| publishDate | 1983 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Concentrations and carbon isotopic compositions of CH4 and CO2 at DSDP Site 76-533 Galimov, Erik M Kvenvolden, Keith A 76-533; 76-533A; Carbon dioxide; Deep Sea Drilling Project; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Gas chromatography; Glomar Challenger; Leg76; Mass spectrometry (MS); Methane; North Atlantic/RIDGE; Sample code/label; δ13C, carbon dioxide, aquatic; δ13C, methane The principal gaseous carbon-containing components identified in the first 400 m of sediment at Deep Sea Drilling Project Site 533, Leg 76, are methane (CH4) and carbon dioxide (CO2). Below a sub-bottom depth of about 25 m, sediment cores commonly contained pockets caused by the expansion of gas upon core recovery. The carbon isotopic composition (d13C per mil relative to PDB standard) of CH4 and CO2 in these gas pockets has been measured, resulting in the following observations: (1) d13C-CH4 values increase with depth from approximately -94 per mil in the uppermost sediment to about -66 per mil in the deepest sediment, reflecting a systematic but nonlinear depletion of 12C with depth. (2) d13C-CO2 values also increase with depth of sediment from about -25 per mil to about -4 per mil, snowing a depletion of 12C that closely parallels the trend of the isotopic composition of CH4. The magnitude and parallel distribution of d13C values for both CH4 and CO2 are consistent with the concept that the formation of the CH4 resulted from the microbiological reduction of CO2 from organic substances. These results imply that CH4 and CO2 incorporated in gas hydrates at this site are biogenic. |
| title | (Table 1) Concentrations and carbon isotopic compositions of CH4 and CO2 at DSDP Site 76-533 |
| topic | 76-533; 76-533A; Carbon dioxide; Deep Sea Drilling Project; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Event label; Gas chromatography; Glomar Challenger; Leg76; Mass spectrometry (MS); Methane; North Atlantic/RIDGE; Sample code/label; δ13C, carbon dioxide, aquatic; δ13C, methane |
| url | https://doi.org/10.1594/PANGAEA.809823 |