A square-lattice gauge-theory model for spin-charge-separated supercon
ductivity is introduced. The phases of the spinon and holon order para
meters couple gauge invariantly via a statistical gauge field, which a
rises from the implicit strong interaction physics. We find that physi
cal electronic phase correlations show a superconductor-normal-metal p
hase transition of the Berezinskii-Kosterlitz-Thouless type, while sta
tistical gauge-field excitations are strictly gapless. These results a
re discussed in the context of both the superconducting and the normal
-state properties of the oxide superconductors.