par Boulégue, Jacques;Iiyama, Jean J.T.;Charlou, Jean-Luc;Jedwab, Jacques 
Référence Earth and planetary science letters, 83, 1-4, page (363-375)
Publication Publié, 1987-05
Référence Earth and planetary science letters, 83, 1-4, page (363-375)
Publication Publié, 1987-05
Article révisé par les pairs
| Résumé : | Deep-water samples collected during the Kaiko project are often associated with biological communities located on geological structures favorable to fluid venting. The evidence of fluid venting are the temperature anomalies, the decrease in sulfate concentrations, the content in methane and the low C1 (C2 + C3) ratio of light hydrocarbons. Because of large dilution by ambiant seawater during sampling it is difficult to compute the composition of the advected end-member pore fluid. Part of this fluid should originate in the "petroleum window", i.e. at temperature about 60°C. Modeling the upward flow of water, taking into account the anomalies of temperature measured on the seafloor and the geochemical anomalies, leads to non-steady-state advection of the pore fluid. The occurrence of a deep component in the fluid has implications for the geological and tectonic models of the subduction zones off Japan. © 1987. |
