HR: 1340h
AN: V13B-1344    [Abstracts]
TI: Simulation of Hydrothermal Vent Complexes
AU: * Nicolaisen, F F
EM: f.f.nicolaisen@fys.uio.no
AF: Physics of Geological Processes, Fysisk Institutt Pb 1048 Blindern, Oslo, 0316, Norway
AU: Malthe-Sorensson, A
EM: anders.malthe-sorenssen@fys.uio.no
AF: Physics of Geological Processes, Fysisk Institutt Pb 1048 Blindern, Oslo, 0316, Norway
AU: Rozhko, A
EM: alexander.rozhko@matnat.uio.no
AF: Physics of Geological Processes, Fysisk Institutt Pb 1048 Blindern, Oslo, 0316, Norway
AU: Nermoen, A
EM: anders.nermoen@fys.uio.no
AF: Physics of Geological Processes, Fysisk Institutt Pb 1048 Blindern, Oslo, 0316, Norway
AB: Vent-complexes are a common geological feature arising when fluid overpressure generation causes hydraulic fracturing reaching the surface. They are commonly associated with volcanic basins and basins with rapidly deposited clay sequences. We have developed models representing host rock as porous media with discrete and continous models, coupled with models for diffusive fluid flow. The results are compared with analytical solutions and experiments, as well as the geological analogues. Using these models we can determine parameters of vent formation, such as venting number and venting duration, dynamics of vent initialization, fracture velocity, granular velocity, ejecta and energy. We can also compare post-formation morphology (crater diameter, refill slope) and the dynamics as a result of periodic fluidization, secondary fluid migration and channel formation. We have also done statistical analysis on the distribution of vents-complexes in the field, and we have developed an analytical model for this. The simulation results have been compared with these, and and the critical parameters analysed.
DE: 0545 Modeling (4255)
DE: 1622 Earth system modeling (1225)
DE: 3616 Hydrothermal systems (0450, 1034, 3017, 4832, 8135, 8424)
DE: 5104 Fracture and flow
DE: 8426 Mud volcanism
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2007 Fall Meeting