The Hydraulic Behavior of a Crack-Seal Vein-Producing Fluid-Rock System

The Mecsekalja Zone crystalline metamorphic rocks are crosscut by a crack-seal texture vein generation. Crack-seal textures are indicative of intermittent hydraulic behavior of a fluid-rock system and of fluid pressure fluctuations. Here we present microthermometric and δD composition data from primary fluid inclusions of the crack-seal veins that are presented together with earlier published stable isotope compositions of the vein calcite. Taken together, this reveals some features of the hydraulic behavior of the fluid-rock system during the crack-seal process.