Fig. 14

A Schematic illustration of deep topography driven, hydrothermal flow systems with upwelling of saline water in the central URG (Stober and Bucher 2015), blue arrows showing the generalized fluid pathways within the basement and lower situated sedimentary horizons; B 3D visualization of simulated streamlines in the northern URG (Koltzer et al. 2019). The color code shows in red Darcy velocities in the positive z-direction (upflow) and in blue in the negative z-direction (downflow). With velocities from black over dark colors to light colors into white. a Streamlines above the Variscan crust in a block in South-West Hesse; b profile perpendicular to the Upper Rhine Graben with streamlines in Cenozoic and Rotliegend sediments. White arrows highlight the simulated fluid circulation in the URG