Isotopic composition of interstitial fluids and origin of methane at DSDP Leg 84 Holes
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| Autores principales: | , , , , |
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
| Publicado: |
PANGAEA
1985
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| _version_ | 1867167669362360320 |
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| author | Claypool, George E Threlkeld, Charles N Mankiewicz, Paul N Arthur, Michael A Anderson, Thomas F |
| author_facet | Claypool, George E Threlkeld, Charles N Mankiewicz, Paul N Arthur, Michael A Anderson, Thomas F |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | CH4 and CO2 species in pore fluids from slope sediments off Guatemala show extreme 13C-enrichment (d13C of -41 and +38 per mil, respectively) compared with the typical degree of 13C-enrichment in pore fluids of DSDP sediments (d13C of - 60 and + 10 per mil). These unusual isotopic compositions are believed to result from microbial decomposition of organic matter, and possibly from additional isotopic fractionation associated with the formation of gas hydrates. In addition to the isotopic fractionation displayed by CH4 and CO2, the pore water exhibits a systematic increase in d18O with decrease in chlorinity. As against seawater d18O values of 0 and chlorinity of 19 per mil, the water collected from decomposed gas hydrate from Hole 570 had a d18O of + 3.0 per mil and chlorinity of 9.5 per mil. The isotopic compositions of pore-fluid constituents change gradually with depth in Hole 568 and discontinuously with depth in Hole 570. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_804310 |
| institution | PANGAEA |
| language | en |
| publishDate | 1985 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Isotopic composition of interstitial fluids and origin of methane at DSDP Leg 84 Holes Claypool, George E Threlkeld, Charles N Mankiewicz, Paul N Arthur, Michael A Anderson, Thomas F Deep Sea Drilling Project; DSDP CH4 and CO2 species in pore fluids from slope sediments off Guatemala show extreme 13C-enrichment (d13C of -41 and +38 per mil, respectively) compared with the typical degree of 13C-enrichment in pore fluids of DSDP sediments (d13C of - 60 and + 10 per mil). These unusual isotopic compositions are believed to result from microbial decomposition of organic matter, and possibly from additional isotopic fractionation associated with the formation of gas hydrates. In addition to the isotopic fractionation displayed by CH4 and CO2, the pore water exhibits a systematic increase in d18O with decrease in chlorinity. As against seawater d18O values of 0 and chlorinity of 19 per mil, the water collected from decomposed gas hydrate from Hole 570 had a d18O of + 3.0 per mil and chlorinity of 9.5 per mil. The isotopic compositions of pore-fluid constituents change gradually with depth in Hole 568 and discontinuously with depth in Hole 570. |
| title | Isotopic composition of interstitial fluids and origin of methane at DSDP Leg 84 Holes |
| topic | Deep Sea Drilling Project; DSDP |
| url | https://doi.org/10.1594/PANGAEA.804310 |