Abstract
AbstractA mechanism is presented for the pulses of high fluid pressure (PF) necessary for fluid‐assisted brecciation. Establishment of hydraulic‐ or pneumatic‐connectivity between rock masses with different PF can cause overpressure in the higher rocks because the PF gradient is parallel to the hydrostatic gradient (the centroid effect). PF can become high enough to create a fracture network, with an influx of fluids and mineralisation occurring as fluids migrate to areas of lower PF. Changes in PF caused by the centroid effect can cause other structures and seismicity.
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