3D Cascadia Basin (2000)

As part of our first expeditions SO 111 and SO 149 to the Cascadia Margin and Cascadia Basin, we investigated the relationship between fluid flowwithin the ocean crust and a possible exchange with the ocean through faults and fluid upflow zones.

Based on reflectivity anomalies above basement highs (Zühlsdorff et al., 1998) we assumed that they may indicate fluid upflow zones, similar to gas-dominated environments on passive margin, where organic matter degradation leads to high gas concentrations.

While to morphology of the oceanographic crust leads to


Zühlsdorff, Lars, Spiess V. (2006), Sedimentation patterns, folding, and fluid upflow above a buried basement ridge: Results from 2-D and 3-D seismic surveys at the eastern Juan de Fuca Ridge flank, J. Geophys. Res., 111, B08103, https://doi.org/10.1029/2004JB003227 .

























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