Isotopic composition of interstitial fluids and origin of methane at DSDP Leg 84 Holes
| Cobertura |
MEDIAN LATITUDE: 11.611113 * MEDIAN LONGITUDE: -88.878967 * SOUTH-BOUND LATITUDE: 9.728200 * WEST-BOUND LONGITUDE: -91.392800 * NORTH-BOUND LATITUDE: 13.285300 * EAST-BOUND LONGITUDE: -86.090700 * DATE/TIME START: 1982-01-13T00:00:00 * DATE/TIME END: 1982-02-17T00:00:00 |
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| Data(s) |
14/12/1985
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| Resumo |
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. |
| Formato |
application/zip, 2 datasets |
| Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.804310 doi:10.1594/PANGAEA.804310 |
| Idioma(s) |
en |
| Publicador |
PANGAEA |
| Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
| Fonte |
Supplement to: Claypool, George E; Threlkeld, Charles N; Mankiewicz, Paul N; Arthur, Michael A; Anderson, Thomas F (1985): Isotopic composition of interstitial fluids and origin of methane in slope sediment of the Middle America Trench, Deep Sea Drilling Project Leg 84. In: von Heune, R; Aubouin, J; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 84, 683-691, doi:10.2973/dsdp.proc.84.124.1985 |
| Palavras-Chave | ##1; ? indicate suspect because of deviation from trends; #2; Alkalinity, total; AT; Carbon dioxide; Chlorinity; cl; CO2; Comment; d13C CH4; d13C CO2 aq; d18O; dD CH4; Deep Sea Drilling Project; delta 13C, carbon dioxide, aquatic; delta 13C, methane; delta 18O; delta Deuterium, methane; Depth; DEPTH, sediment/rock; DSDP; Event; Label; mbsf; ODP sample designation; Sample code/label; see reference(s); vs. SMOW, ? indicate suspect because of deviation from trends |
| Tipo |
Dataset |
