Abstract
We summarize and discuss the evidence for fluids in the deep crust in the Black Forest, SW Germany. Joint interpretation of wide-angle and near-vertical compressional and shear wave seismic data provide a valuable tool for the detection of fluids in the crystalline crust. Together with other geophysical informations — conductivity, thermal properties and an established petrological model, we propose a model that interpretes a pronounced low-velocity zone at mid-crustal level as a layer enriched in fluids and influenced by retrograde metamorphism because of these fluids. The water is expelled during prograde metamorphism in the lower crust caused by intrusions of hot basaltic material related to Tertiary rift processes.
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