The gas bursts occur steadily from

The gas bursts occur steadily from their initiation point until deformation is halted, after which the 4He and 4 0Ar par-tial pressures return toward their original values. The release pattern observed is consistent with fracturing of individual mineral grains which releases radiogenic gases. The difference in response time between the leak detector and the quadrupole can be explained by the leak detector’s dynamic ranging features, which open and close valves depending upon the inlet pressure decreasing instrumental response time. In contrast, the quadrupole system remains in a constant fully open configuration.