Hi,
If we look at the circuit as three different parts, things might look a little different. Looking at the output of the circuit i would say that the zener diode and the 100Ohm resistor constitute a current and voltage limitation. The negative input terminal is preceeded by a passive high pass filter; and the positive feedback has the behavior of a gain controlled integrator. Putting these three units together, I would say that this circuit is a voltage limited gain controlled bandpass filter, through which the gain of the pass band can be set via the feeback resistor and the grounded resistor of the positive input terminal. The cutoff frequencies are determined by the respective capacitances and RC constants. The maximum output voltage is set by the zener diode; and finally the 100Ohm output resistor could be used as a current limiter of some sort.